Merge tag 'at91-ab-4.12-soc' of git://git.kernel.org/pub/scm/linux/kernel/git/abelloni/linux into next/soc

SoC for 4.12:

 - huge PM cleanup
 - Move SoC detection to its own driver

* tag 'at91-ab-4.12-soc' of git://git.kernel.org/pub/scm/linux/kernel/git/abelloni/linux:
  ARM: at91: move SoC detection to its own driver
  ARM: at91: pm: correct typo
  ARM: at91: pm: Remove at91_pm_set_standby
  ARM: at91: pm: Merge all at91sam9*_pm_init
  ARM: at91: pm: Tie the USB clock mask to the pmc
  ARM: at91: pm: Tie the memory controller type to the ramc id
  ARM: at91: pm: Workaround DDRSDRC self-refresh bug with LPDDR1 memories.
  ARM: at91: pm: Simplify at91rm9200_standby
  ARM: at91: pm: Use struct at91_pm_data in pm_suspend.S
  ARM: at91: pm: Move global variables into at91_pm_data
  ARM: at91: pm: Move at91_ramc_read/write to pm.c
  ARM: at91: pm: Cleanup headers
  MAINTAINERS: Add memory drivers to AT91 entry
  MAINTAINERS: Update AT91 entry
  ARM: at91: pm: cpu_idle: switch DDR to power-down mode
  Revert "ARM: at91/dt: sama5d2: Use new compatible for ohci node"

Signed-off-by: Olof Johansson <olof@lixom.net>

18 files changed, 433 insertions, 436 deletions

diff --git a/MAINTAINERS b/MAINTAINERS
index 8cd40d7063b2..f79067d79dfc 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -1104,7 +1104,6 @@ F:	drivers/*/*aspeed*
 ARM/ATMEL AT91RM9200, AT91SAM9 AND SAMA5 SOC SUPPORT
 M:	Nicolas Ferre <nicolas.ferre@microchip.com>
 M:	Alexandre Belloni <alexandre.belloni@free-electrons.com>
-M:	Jean-Christophe Plagniol-Villard <plagnioj@jcrosoft.com>
 L:	linux-arm-kernel@lists.infradead.org (moderated for non-subscribers)
 W:	http://www.linux4sam.org
 T:	git git://git.kernel.org/pub/scm/linux/kernel/git/nferre/linux-at91.git
@@ -1116,6 +1115,7 @@ F:	arch/arm/boot/dts/at91*.dtsi
 F:	arch/arm/boot/dts/sama*.dts
 F:	arch/arm/boot/dts/sama*.dtsi
 F:	arch/arm/include/debug/at91.S
+F:	drivers/memory/atmel*
 
 ARM/ATMEL AT91 Clock Support
 M:	Boris Brezillon <boris.brezillon@free-electrons.com>
diff --git a/arch/arm/boot/dts/sama5d2.dtsi b/arch/arm/boot/dts/sama5d2.dtsi
index 22332be72140..528b4e9c6d3d 100644
--- a/arch/arm/boot/dts/sama5d2.dtsi
+++ b/arch/arm/boot/dts/sama5d2.dtsi
@@ -266,7 +266,7 @@
 		};
 
 		usb1: ohci@00400000 {
-			compatible = "atmel,sama5d2-ohci", "usb-ohci";
+			compatible = "atmel,at91rm9200-ohci", "usb-ohci";
 			reg = <0x00400000 0x100000>;
 			interrupts = <41 IRQ_TYPE_LEVEL_HIGH 2>;
 			clocks = <&uhphs_clk>, <&uhphs_clk>, <&uhpck>;
diff --git a/arch/arm/mach-at91/Makefile b/arch/arm/mach-at91/Makefile
index c5bbf8bb8c0f..cfd8f60a9268 100644
--- a/arch/arm/mach-at91/Makefile
+++ b/arch/arm/mach-at91/Makefile
@@ -1,7 +1,6 @@
 #
 # Makefile for the linux kernel.
 #
-obj-y		:= soc.o
 
 # CPU-specific support
 obj-$(CONFIG_SOC_AT91RM9200)	+= at91rm9200.o
@@ -18,3 +17,36 @@ endif
 ifeq ($(CONFIG_PM_DEBUG),y)
 CFLAGS_pm.o += -DDEBUG
 endif
+
+# Default sed regexp - multiline due to syntax constraints
+define sed-y
+	"/^->/{s:->#\(.*\):/* \1 */:; \
+	s:^->\([^ ]*\) [\$$#]*\([-0-9]*\) \(.*\):#define \1 \2 /* \3 */:; \
+	s:^->\([^ ]*\) [\$$#]*\([^ ]*\) \(.*\):#define \1 \2 /* \3 */:; \
+	s:->::; p;}"
+endef
+
+# Use filechk to avoid rebuilds when a header changes, but the resulting file
+# does not
+define filechk_offsets
+	(set -e; \
+	 echo "#ifndef $2"; \
+	 echo "#define $2"; \
+	 echo "/*"; \
+	 echo " * DO NOT MODIFY."; \
+	 echo " *"; \
+	 echo " * This file was generated by Kbuild"; \
+	 echo " */"; \
+	 echo ""; \
+	 sed -ne $(sed-y); \
+	 echo ""; \
+	 echo "#endif" )
+endef
+
+arch/arm/mach-at91/pm_data-offsets.s: arch/arm/mach-at91/pm_data-offsets.c
+	$(call if_changed_dep,cc_s_c)
+
+include/generated/at91_pm_data-offsets.h: arch/arm/mach-at91/pm_data-offsets.s FORCE
+	$(call filechk,offsets,__PM_DATA_OFFSETS_H__)
+
+arch/arm/mach-at91/pm_suspend.o: include/generated/at91_pm_data-offsets.h
diff --git a/arch/arm/mach-at91/at91rm9200.c b/arch/arm/mach-at91/at91rm9200.c
index d068ec3cd1f6..656ad409a253 100644
--- a/arch/arm/mach-at91/at91rm9200.c
+++ b/arch/arm/mach-at91/at91rm9200.c
@@ -14,23 +14,10 @@
 #include <asm/mach/arch.h>
 
 #include "generic.h"
-#include "soc.h"
-
-static const struct at91_soc rm9200_socs[] = {
-	AT91_SOC(AT91RM9200_CIDR_MATCH, 0, "at91rm9200 BGA", "at91rm9200"),
-	{ /* sentinel */ },
-};
 
 static void __init at91rm9200_dt_device_init(void)
 {
-	struct soc_device *soc;
-	struct device *soc_dev = NULL;
-
-	soc = at91_soc_init(rm9200_socs);
-	if (soc != NULL)
-		soc_dev = soc_device_to_device(soc);
-
-	of_platform_default_populate(NULL, NULL, soc_dev);
+	of_platform_default_populate(NULL, NULL, NULL);
 
 	at91rm9200_pm_init();
 }
diff --git a/arch/arm/mach-at91/at91sam9.c b/arch/arm/mach-at91/at91sam9.c
index ba28e9cc584d..3dbdef4d3cbf 100644
--- a/arch/arm/mach-at91/at91sam9.c
+++ b/arch/arm/mach-at91/at91sam9.c
@@ -14,60 +14,12 @@
 #include <asm/system_misc.h>
 
 #include "generic.h"
-#include "soc.h"
 
-static const struct at91_soc at91sam9_socs[] = {
-	AT91_SOC(AT91SAM9260_CIDR_MATCH, 0, "at91sam9260", NULL),
-	AT91_SOC(AT91SAM9261_CIDR_MATCH, 0, "at91sam9261", NULL),
-	AT91_SOC(AT91SAM9263_CIDR_MATCH, 0, "at91sam9263", NULL),
-	AT91_SOC(AT91SAM9G20_CIDR_MATCH, 0, "at91sam9g20", NULL),
-	AT91_SOC(AT91SAM9RL64_CIDR_MATCH, 0, "at91sam9rl64", NULL),
-	AT91_SOC(AT91SAM9G45_CIDR_MATCH, AT91SAM9M11_EXID_MATCH,
-		 "at91sam9m11", "at91sam9g45"),
-	AT91_SOC(AT91SAM9G45_CIDR_MATCH, AT91SAM9M10_EXID_MATCH,
-		 "at91sam9m10", "at91sam9g45"),
-	AT91_SOC(AT91SAM9G45_CIDR_MATCH, AT91SAM9G46_EXID_MATCH,
-		 "at91sam9g46", "at91sam9g45"),
-	AT91_SOC(AT91SAM9G45_CIDR_MATCH, AT91SAM9G45_EXID_MATCH,
-		 "at91sam9g45", "at91sam9g45"),
-	AT91_SOC(AT91SAM9X5_CIDR_MATCH, AT91SAM9G15_EXID_MATCH,
-		 "at91sam9g15", "at91sam9x5"),
-	AT91_SOC(AT91SAM9X5_CIDR_MATCH, AT91SAM9G35_EXID_MATCH,
-		 "at91sam9g35", "at91sam9x5"),
-	AT91_SOC(AT91SAM9X5_CIDR_MATCH, AT91SAM9X35_EXID_MATCH,
-		 "at91sam9x35", "at91sam9x5"),
-	AT91_SOC(AT91SAM9X5_CIDR_MATCH, AT91SAM9G25_EXID_MATCH,
-		 "at91sam9g25", "at91sam9x5"),
-	AT91_SOC(AT91SAM9X5_CIDR_MATCH, AT91SAM9X25_EXID_MATCH,
-		 "at91sam9x25", "at91sam9x5"),
-	AT91_SOC(AT91SAM9N12_CIDR_MATCH, AT91SAM9CN12_EXID_MATCH,
-		 "at91sam9cn12", "at91sam9n12"),
-	AT91_SOC(AT91SAM9N12_CIDR_MATCH, AT91SAM9N12_EXID_MATCH,
-		 "at91sam9n12", "at91sam9n12"),
-	AT91_SOC(AT91SAM9N12_CIDR_MATCH, AT91SAM9CN11_EXID_MATCH,
-		 "at91sam9cn11", "at91sam9n12"),
-	AT91_SOC(AT91SAM9XE128_CIDR_MATCH, 0, "at91sam9xe128", "at91sam9xe128"),
-	AT91_SOC(AT91SAM9XE256_CIDR_MATCH, 0, "at91sam9xe256", "at91sam9xe256"),
-	AT91_SOC(AT91SAM9XE512_CIDR_MATCH, 0, "at91sam9xe512", "at91sam9xe512"),
-	{ /* sentinel */ },
-};
-
-static void __init at91sam9_common_init(void)
+static void __init at91sam9_init(void)
 {
-	struct soc_device *soc;
-	struct device *soc_dev = NULL;
-
-	soc = at91_soc_init(at91sam9_socs);
-	if (soc != NULL)
-		soc_dev = soc_device_to_device(soc);
+	of_platform_default_populate(NULL, NULL, NULL);
 
-	of_platform_default_populate(NULL, NULL, soc_dev);
-}
-
-static void __init at91sam9_dt_device_init(void)
-{
-	at91sam9_common_init();
-	at91sam9260_pm_init();
+	at91sam9_pm_init();
 }
 
 static const char *const at91_dt_board_compat[] __initconst = {
@@ -77,41 +29,6 @@ static const char *const at91_dt_board_compat[] __initconst = {
 
 DT_MACHINE_START(at91sam_dt, "Atmel AT91SAM9")
 	/* Maintainer: Atmel */
-	.init_machine	= at91sam9_dt_device_init,
+	.init_machine	= at91sam9_init,
 	.dt_compat	= at91_dt_board_compat,
 MACHINE_END
-
-static void __init at91sam9g45_dt_device_init(void)
-{
-	at91sam9_common_init();
-	at91sam9g45_pm_init();
-}
-
-static const char *const at91sam9g45_board_compat[] __initconst = {
-	"atmel,at91sam9g45",
-	NULL
-};
-
-DT_MACHINE_START(at91sam9g45_dt, "Atmel AT91SAM9G45")
-	/* Maintainer: Atmel */
-	.init_machine	= at91sam9g45_dt_device_init,
-	.dt_compat	= at91sam9g45_board_compat,
-MACHINE_END
-
-static void __init at91sam9x5_dt_device_init(void)
-{
-	at91sam9_common_init();
-	at91sam9x5_pm_init();
-}
-
-static const char *const at91sam9x5_board_compat[] __initconst = {
-	"atmel,at91sam9x5",
-	"atmel,at91sam9n12",
-	NULL
-};
-
-DT_MACHINE_START(at91sam9x5_dt, "Atmel AT91SAM9")
-	/* Maintainer: Atmel */
-	.init_machine	= at91sam9x5_dt_device_init,
-	.dt_compat	= at91sam9x5_board_compat,
-MACHINE_END
diff --git a/arch/arm/mach-at91/generic.h b/arch/arm/mach-at91/generic.h
index 28ca57a2060f..f1ead0f13c19 100644
--- a/arch/arm/mach-at91/generic.h
+++ b/arch/arm/mach-at91/generic.h
@@ -13,15 +13,11 @@
 
 #ifdef CONFIG_PM
 extern void __init at91rm9200_pm_init(void);
-extern void __init at91sam9260_pm_init(void);
-extern void __init at91sam9g45_pm_init(void);
-extern void __init at91sam9x5_pm_init(void);
+extern void __init at91sam9_pm_init(void);
 extern void __init sama5_pm_init(void);
 #else
 static inline void __init at91rm9200_pm_init(void) { }
-static inline void __init at91sam9260_pm_init(void) { }
-static inline void __init at91sam9g45_pm_init(void) { }
-static inline void __init at91sam9x5_pm_init(void) { }
+static inline void __init at91sam9_pm_init(void) { }
 static inline void __init sama5_pm_init(void) { }
 #endif
 
diff --git a/arch/arm/mach-at91/pm.c b/arch/arm/mach-at91/pm.c
index 3d89b7905bd9..2cd27c830ab6 100644
--- a/arch/arm/mach-at91/pm.c
+++ b/arch/arm/mach-at91/pm.c
@@ -10,35 +10,22 @@
  * (at your option) any later version.
  */
 
-#include <linux/gpio.h>
-#include <linux/suspend.h>
-#include <linux/sched.h>
-#include <linux/proc_fs.h>
 #include <linux/genalloc.h>
-#include <linux/interrupt.h>
-#include <linux/sysfs.h>
-#include <linux/module.h>
+#include <linux/io.h>
+#include <linux/of_address.h>
 #include <linux/of.h>
 #include <linux/of_platform.h>
-#include <linux/of_address.h>
-#include <linux/platform_device.h>
-#include <linux/platform_data/atmel.h>
-#include <linux/io.h>
+#include <linux/suspend.h>
+
 #include <linux/clk/at91_pmc.h>
 
-#include <asm/irq.h>
-#include <linux/atomic.h>
-#include <asm/mach/time.h>
-#include <asm/mach/irq.h>
-#include <asm/fncpy.h>
 #include <asm/cacheflush.h>
+#include <asm/fncpy.h>
 #include <asm/system_misc.h>
 
 #include "generic.h"
 #include "pm.h"
 
-static void __iomem *pmc;
-
 /*
  * FIXME: this is needed to communicate between the pinctrl driver and
  * the PM implementation in the machine. Possibly part of the PM
@@ -50,12 +37,13 @@ extern void at91_pinctrl_gpio_suspend(void);
 extern void at91_pinctrl_gpio_resume(void);
 #endif
 
-static struct {
-	unsigned long uhp_udp_mask;
-	int memctrl;
-} at91_pm_data;
+static struct at91_pm_data pm_data;
 
-static void __iomem *at91_ramc_base[2];
+#define at91_ramc_read(id, field) \
+	__raw_readl(pm_data.ramc[id] + field)
+
+#define at91_ramc_write(id, field, value) \
+	__raw_writel(value, pm_data.ramc[id] + field)
 
 static int at91_pm_valid_state(suspend_state_t state)
 {
@@ -91,10 +79,10 @@ static int at91_pm_verify_clocks(void)
 	unsigned long scsr;
 	int i;
 
-	scsr = readl(pmc + AT91_PMC_SCSR);
+	scsr = readl(pm_data.pmc + AT91_PMC_SCSR);
 
 	/* USB must not be using PLLB */
-	if ((scsr & at91_pm_data.uhp_udp_mask) != 0) {
+	if ((scsr & pm_data.uhp_udp_mask) != 0) {
 		pr_err("AT91: PM - Suspend-to-RAM with USB still active\n");
 		return 0;
 	}
@@ -105,7 +93,7 @@ static int at91_pm_verify_clocks(void)
 
 		if ((scsr & (AT91_PMC_PCK0 << i)) == 0)
 			continue;
-		css = readl(pmc + AT91_PMC_PCKR(i)) & AT91_PMC_CSS;
+		css = readl(pm_data.pmc + AT91_PMC_PCKR(i)) & AT91_PMC_CSS;
 		if (css != AT91_PMC_CSS_SLOW) {
 			pr_err("AT91: PM - Suspend-to-RAM with PCK%d src %d\n", i, css);
 			return 0;
@@ -131,25 +119,18 @@ int at91_suspend_entering_slow_clock(void)
 }
 EXPORT_SYMBOL(at91_suspend_entering_slow_clock);
 
-static void (*at91_suspend_sram_fn)(void __iomem *pmc, void __iomem *ramc0,
-			  void __iomem *ramc1, int memctrl);
-
-extern void at91_pm_suspend_in_sram(void __iomem *pmc, void __iomem *ramc0,
-			    void __iomem *ramc1, int memctrl);
+static void (*at91_suspend_sram_fn)(struct at91_pm_data *);
+extern void at91_pm_suspend_in_sram(struct at91_pm_data *pm_data);
 extern u32 at91_pm_suspend_in_sram_sz;
 
 static void at91_pm_suspend(suspend_state_t state)
 {
-	unsigned int pm_data = at91_pm_data.memctrl;
-
-	pm_data |= (state == PM_SUSPEND_MEM) ?
-				AT91_PM_MODE(AT91_PM_SLOW_CLOCK) : 0;
+	pm_data.mode = (state == PM_SUSPEND_MEM) ? AT91_PM_SLOW_CLOCK : 0;
 
 	flush_cache_all();
 	outer_disable();
 
-	at91_suspend_sram_fn(pmc, at91_ramc_base[0],
-			     at91_ramc_base[1], pm_data);
+	at91_suspend_sram_fn(&pm_data);
 
 	outer_resume();
 }
@@ -224,12 +205,6 @@ static struct platform_device at91_cpuidle_device = {
 	.name = "cpuidle-at91",
 };
 
-static void at91_pm_set_standby(void (*at91_standby)(void))
-{
-	if (at91_standby)
-		at91_cpuidle_device.dev.platform_data = at91_standby;
-}
-
 /*
  * The AT91RM9200 goes into self-refresh mode with this command, and will
  * terminate self-refresh automatically on the next SDRAM access.
@@ -241,20 +216,15 @@ static void at91_pm_set_standby(void (*at91_standby)(void))
  */
 static void at91rm9200_standby(void)
 {
-	u32 lpr = at91_ramc_read(0, AT91_MC_SDRAMC_LPR);
-
 	asm volatile(
 		"b    1f\n\t"
 		".align    5\n\t"
 		"1:  mcr    p15, 0, %0, c7, c10, 4\n\t"
-		"    str    %0, [%1, %2]\n\t"
-		"    str    %3, [%1, %4]\n\t"
+		"    str    %2, [%1, %3]\n\t"
 		"    mcr    p15, 0, %0, c7, c0, 4\n\t"
-		"    str    %5, [%1, %2]"
 		:
-		: "r" (0), "r" (at91_ramc_base[0]), "r" (AT91_MC_SDRAMC_LPR),
-		  "r" (1), "r" (AT91_MC_SDRAMC_SRR),
-		  "r" (lpr));
+		: "r" (0), "r" (pm_data.ramc[0]),
+		  "r" (1), "r" (AT91_MC_SDRAMC_SRR));
 }
 
 /* We manage both DDRAM/SDRAM controllers, we need more than one value to
@@ -265,12 +235,27 @@ static void at91_ddr_standby(void)
 	/* Those two values allow us to delay self-refresh activation
 	 * to the maximum. */
 	u32 lpr0, lpr1 = 0;
+	u32 mdr, saved_mdr0, saved_mdr1 = 0;
 	u32 saved_lpr0, saved_lpr1 = 0;
 
-	if (at91_ramc_base[1]) {
+	/* LPDDR1 --> force DDR2 mode during self-refresh */
+	saved_mdr0 = at91_ramc_read(0, AT91_DDRSDRC_MDR);
+	if ((saved_mdr0 & AT91_DDRSDRC_MD) == AT91_DDRSDRC_MD_LOW_POWER_DDR) {
+		mdr = saved_mdr0 & ~AT91_DDRSDRC_MD;
+		mdr |= AT91_DDRSDRC_MD_DDR2;
+		at91_ramc_write(0, AT91_DDRSDRC_MDR, mdr);
+	}
+
+	if (pm_data.ramc[1]) {
 		saved_lpr1 = at91_ramc_read(1, AT91_DDRSDRC_LPR);
 		lpr1 = saved_lpr1 & ~AT91_DDRSDRC_LPCB;
 		lpr1 |= AT91_DDRSDRC_LPCB_SELF_REFRESH;
+		saved_mdr1 = at91_ramc_read(1, AT91_DDRSDRC_MDR);
+		if ((saved_mdr1 & AT91_DDRSDRC_MD) == AT91_DDRSDRC_MD_LOW_POWER_DDR) {
+			mdr = saved_mdr1 & ~AT91_DDRSDRC_MD;
+			mdr |= AT91_DDRSDRC_MD_DDR2;
+			at91_ramc_write(1, AT91_DDRSDRC_MDR, mdr);
+		}
 	}
 
 	saved_lpr0 = at91_ramc_read(0, AT91_DDRSDRC_LPR);
@@ -279,14 +264,33 @@ static void at91_ddr_standby(void)
 
 	/* self-refresh mode now */
 	at91_ramc_write(0, AT91_DDRSDRC_LPR, lpr0);
-	if (at91_ramc_base[1])
+	if (pm_data.ramc[1])
 		at91_ramc_write(1, AT91_DDRSDRC_LPR, lpr1);
 
 	cpu_do_idle();
 
+	at91_ramc_write(0, AT91_DDRSDRC_MDR, saved_mdr0);
 	at91_ramc_write(0, AT91_DDRSDRC_LPR, saved_lpr0);
-	if (at91_ramc_base[1])
+	if (pm_data.ramc[1]) {
+		at91_ramc_write(0, AT91_DDRSDRC_MDR, saved_mdr1);
 		at91_ramc_write(1, AT91_DDRSDRC_LPR, saved_lpr1);
+	}
+}
+
+static void sama5d3_ddr_standby(void)
+{
+	u32 lpr0;
+	u32 saved_lpr0;
+
+	saved_lpr0 = at91_ramc_read(0, AT91_DDRSDRC_LPR);
+	lpr0 = saved_lpr0 & ~AT91_DDRSDRC_LPCB;
+	lpr0 |= AT91_DDRSDRC_LPCB_POWER_DOWN;
+
+	at91_ramc_write(0, AT91_DDRSDRC_LPR, lpr0);
+
+	cpu_do_idle();
+
+	at91_ramc_write(0, AT91_DDRSDRC_LPR, saved_lpr0);
 }
 
 /* We manage both DDRAM/SDRAM controllers, we need more than one value to
@@ -297,7 +301,7 @@ static void at91sam9_sdram_standby(void)
 	u32 lpr0, lpr1 = 0;
 	u32 saved_lpr0, saved_lpr1 = 0;
 
-	if (at91_ramc_base[1]) {
+	if (pm_data.ramc[1]) {
 		saved_lpr1 = at91_ramc_read(1, AT91_SDRAMC_LPR);
 		lpr1 = saved_lpr1 & ~AT91_SDRAMC_LPCB;
 		lpr1 |= AT91_SDRAMC_LPCB_SELF_REFRESH;
@@ -309,21 +313,33 @@ static void at91sam9_sdram_standby(void)
 
 	/* self-refresh mode now */
 	at91_ramc_write(0, AT91_SDRAMC_LPR, lpr0);
-	if (at91_ramc_base[1])
+	if (pm_data.ramc[1])
 		at91_ramc_write(1, AT91_SDRAMC_LPR, lpr1);
 
 	cpu_do_idle();
 
 	at91_ramc_write(0, AT91_SDRAMC_LPR, saved_lpr0);
-	if (at91_ramc_base[1])
+	if (pm_data.ramc[1])
 		at91_ramc_write(1, AT91_SDRAMC_LPR, saved_lpr1);
 }
 
+struct ramc_info {
+	void (*idle)(void);
+	unsigned int memctrl;
+};
+
+static const struct ramc_info ramc_infos[] __initconst = {
+	{ .idle = at91rm9200_standby, .memctrl = AT91_MEMCTRL_MC},
+	{ .idle = at91sam9_sdram_standby, .memctrl = AT91_MEMCTRL_SDRAMC},
+	{ .idle = at91_ddr_standby, .memctrl = AT91_MEMCTRL_DDRSDR},
+	{ .idle = sama5d3_ddr_standby, .memctrl = AT91_MEMCTRL_DDRSDR},
+};
+
 static const struct of_device_id const ramc_ids[] __initconst = {
-	{ .compatible = "atmel,at91rm9200-sdramc", .data = at91rm9200_standby },
-	{ .compatible = "atmel,at91sam9260-sdramc", .data = at91sam9_sdram_standby },
-	{ .compatible = "atmel,at91sam9g45-ddramc", .data = at91_ddr_standby },
-	{ .compatible = "atmel,sama5d3-ddramc", .data = at91_ddr_standby },
+	{ .compatible = "atmel,at91rm9200-sdramc", .data = &ramc_infos[0] },
+	{ .compatible = "atmel,at91sam9260-sdramc", .data = &ramc_infos[1] },
+	{ .compatible = "atmel,at91sam9g45-ddramc", .data = &ramc_infos[2] },
+	{ .compatible = "atmel,sama5d3-ddramc", .data = &ramc_infos[3] },
 	{ /*sentinel*/ }
 };
 
@@ -332,15 +348,18 @@ static __init void at91_dt_ramc(void)
 	struct device_node *np;
 	const struct of_device_id *of_id;
 	int idx = 0;
-	const void *standby = NULL;
+	void *standby = NULL;
+	const struct ramc_info *ramc;
 
 	for_each_matching_node_and_match(np, ramc_ids, &of_id) {
-		at91_ramc_base[idx] = of_iomap(np, 0);
-		if (!at91_ramc_base[idx])
+		pm_data.ramc[idx] = of_iomap(np, 0);
+		if (!pm_data.ramc[idx])
 			panic(pr_fmt("unable to map ramc[%d] cpu registers\n"), idx);
 
+		ramc = of_id->data;
 		if (!standby)
-			standby = of_id->data;
+			standby = ramc->idle;
+		pm_data.memctrl = ramc->memctrl;
 
 		idx++;
 	}
@@ -353,7 +372,7 @@ static __init void at91_dt_ramc(void)
 		return;
 	}
 
-	at91_pm_set_standby(standby);
+	at91_cpuidle_device.dev.platform_data = standby;
 }
 
 static void at91rm9200_idle(void)
@@ -362,12 +381,12 @@ static void at91rm9200_idle(void)
 	 * Disable the processor clock.  The processor will be automatically
 	 * re-enabled by an interrupt or by a reset.
 	 */
-	writel(AT91_PMC_PCK, pmc + AT91_PMC_SCDR);
+	writel(AT91_PMC_PCK, pm_data.pmc + AT91_PMC_SCDR);
 }
 
 static void at91sam9_idle(void)
 {
-	writel(AT91_PMC_PCK, pmc + AT91_PMC_SCDR);
+	writel(AT91_PMC_PCK, pm_data.pmc + AT91_PMC_SCDR);
 	cpu_do_idle();
 }
 
@@ -417,31 +436,46 @@ static void __init at91_pm_sram_init(void)
 			&at91_pm_suspend_in_sram, at91_pm_suspend_in_sram_sz);
 }
 
+struct pmc_info {
+	unsigned long uhp_udp_mask;
+};
+
+static const struct pmc_info pmc_infos[] __initconst = {
+	{ .uhp_udp_mask = AT91RM9200_PMC_UHP | AT91RM9200_PMC_UDP },
+	{ .uhp_udp_mask = AT91SAM926x_PMC_UHP | AT91SAM926x_PMC_UDP },
+	{ .uhp_udp_mask = AT91SAM926x_PMC_UHP },
+};
+
 static const struct of_device_id atmel_pmc_ids[] __initconst = {
-	{ .compatible = "atmel,at91rm9200-pmc"  },
-	{ .compatible = "atmel,at91sam9260-pmc" },
-	{ .compatible = "atmel,at91sam9g45-pmc" },
-	{ .compatible = "atmel,at91sam9n12-pmc" },
-	{ .compatible = "atmel,at91sam9x5-pmc" },
-	{ .compatible = "atmel,sama5d3-pmc" },
-	{ .compatible = "atmel,sama5d2-pmc" },
+	{ .compatible = "atmel,at91rm9200-pmc", .data = &pmc_infos[0] },
+	{ .compatible = "atmel,at91sam9260-pmc", .data = &pmc_infos[1] },
+	{ .compatible = "atmel,at91sam9g45-pmc", .data = &pmc_infos[2] },
+	{ .compatible = "atmel,at91sam9n12-pmc", .data = &pmc_infos[1] },
+	{ .compatible = "atmel,at91sam9x5-pmc", .data = &pmc_infos[1] },
+	{ .compatible = "atmel,sama5d3-pmc", .data = &pmc_infos[1] },
+	{ .compatible = "atmel,sama5d2-pmc", .data = &pmc_infos[1] },
 	{ /* sentinel */ },
 };
 
 static void __init at91_pm_init(void (*pm_idle)(void))
 {
 	struct device_node *pmc_np;
+	const struct of_device_id *of_id;
+	const struct pmc_info *pmc;
 
 	if (at91_cpuidle_device.dev.platform_data)
 		platform_device_register(&at91_cpuidle_device);
 
-	pmc_np = of_find_matching_node(NULL, atmel_pmc_ids);
-	pmc = of_iomap(pmc_np, 0);
-	if (!pmc) {
+	pmc_np = of_find_matching_node_and_match(NULL, atmel_pmc_ids, &of_id);
+	pm_data.pmc = of_iomap(pmc_np, 0);
+	if (!pm_data.pmc) {
 		pr_err("AT91: PM not supported, PMC not found\n");
 		return;
 	}
 
+	pmc = of_id->data;
+	pm_data.uhp_udp_mask = pmc->uhp_udp_mask;
+
 	if (pm_idle)
 		arm_pm_idle = pm_idle;
 
@@ -462,40 +496,17 @@ void __init at91rm9200_pm_init(void)
 	 */
 	at91_ramc_write(0, AT91_MC_SDRAMC_LPR, 0);
 
-	at91_pm_data.uhp_udp_mask = AT91RM9200_PMC_UHP | AT91RM9200_PMC_UDP;
-	at91_pm_data.memctrl = AT91_MEMCTRL_MC;
-
 	at91_pm_init(at91rm9200_idle);
 }
 
-void __init at91sam9260_pm_init(void)
-{
-	at91_dt_ramc();
-	at91_pm_data.memctrl = AT91_MEMCTRL_SDRAMC;
-	at91_pm_data.uhp_udp_mask = AT91SAM926x_PMC_UHP | AT91SAM926x_PMC_UDP;
-	at91_pm_init(at91sam9_idle);
-}
-
-void __init at91sam9g45_pm_init(void)
-{
-	at91_dt_ramc();
-	at91_pm_data.uhp_udp_mask = AT91SAM926x_PMC_UHP;
-	at91_pm_data.memctrl = AT91_MEMCTRL_DDRSDR;
-	at91_pm_init(at91sam9_idle);
-}
-
-void __init at91sam9x5_pm_init(void)
+void __init at91sam9_pm_init(void)
 {
 	at91_dt_ramc();
-	at91_pm_data.uhp_udp_mask = AT91SAM926x_PMC_UHP | AT91SAM926x_PMC_UDP;
-	at91_pm_data.memctrl = AT91_MEMCTRL_DDRSDR;
 	at91_pm_init(at91sam9_idle);
 }
 
 void __init sama5_pm_init(void)
 {
 	at91_dt_ramc();
-	at91_pm_data.uhp_udp_mask = AT91SAM926x_PMC_UHP | AT91SAM926x_PMC_UDP;
-	at91_pm_data.memctrl = AT91_MEMCTRL_DDRSDR;
 	at91_pm_init(NULL);
 }
diff --git a/arch/arm/mach-at91/pm.h b/arch/arm/mach-at91/pm.h
index bf980c6ef294..fc0f7d048187 100644
--- a/arch/arm/mach-at91/pm.h
+++ b/arch/arm/mach-at91/pm.h
@@ -17,24 +17,20 @@
 #include <soc/at91/at91sam9_ddrsdr.h>
 #include <soc/at91/at91sam9_sdramc.h>
 
-#ifndef __ASSEMBLY__
-#define at91_ramc_read(id, field) \
-	__raw_readl(at91_ramc_base[id] + field)
-
-#define at91_ramc_write(id, field, value) \
-	__raw_writel(value, at91_ramc_base[id] + field)
-#endif
-
 #define AT91_MEMCTRL_MC		0
 #define AT91_MEMCTRL_SDRAMC	1
 #define AT91_MEMCTRL_DDRSDR	2
 
-#define	AT91_PM_MEMTYPE_MASK	0x0f
-
-#define	AT91_PM_MODE_OFFSET	4
-#define	AT91_PM_MODE_MASK	0x01
-#define	AT91_PM_MODE(x)		(((x) & AT91_PM_MODE_MASK) << AT91_PM_MODE_OFFSET)
-
 #define	AT91_PM_SLOW_CLOCK	0x01
 
+#ifndef __ASSEMBLY__
+struct at91_pm_data {
+	void __iomem *pmc;
+	void __iomem *ramc[2];
+	unsigned long uhp_udp_mask;
+	unsigned int memctrl;
+	unsigned int mode;
+};
+#endif
+
 #endif
diff --git a/arch/arm/mach-at91/pm_data-offsets.c b/arch/arm/mach-at91/pm_data-offsets.c
new file mode 100644
index 000000000000..30302cb16df0
--- /dev/null
+++ b/arch/arm/mach-at91/pm_data-offsets.c
@@ -0,0 +1,13 @@
+#include <linux/stddef.h>
+#include <linux/kbuild.h>
+#include "pm.h"
+
+int main(void)
+{
+	DEFINE(PM_DATA_PMC,		offsetof(struct at91_pm_data, pmc));
+	DEFINE(PM_DATA_RAMC0,		offsetof(struct at91_pm_data, ramc[0]));
+	DEFINE(PM_DATA_RAMC1,		offsetof(struct at91_pm_data, ramc[1]));
+	DEFINE(PM_DATA_MEMCTRL,	offsetof(struct at91_pm_data, memctrl));
+	DEFINE(PM_DATA_MODE,		offsetof(struct at91_pm_data, mode));
+	return 0;
+}
diff --git a/arch/arm/mach-at91/pm_suspend.S b/arch/arm/mach-at91/pm_suspend.S
index a25defda3d22..96781daa671a 100644
--- a/arch/arm/mach-at91/pm_suspend.S
+++ b/arch/arm/mach-at91/pm_suspend.S
@@ -4,7 +4,7 @@
  *  Copyright (C) 2006 Savin Zlobec
  *
  * AT91SAM9 support:
- *  Copyright (C) 2007 Anti Sullin <anti.sullin@artecdesign.ee
+ *  Copyright (C) 2007 Anti Sullin <anti.sullin@artecdesign.ee>
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License version 2 as
@@ -14,6 +14,7 @@
 #include <linux/linkage.h>
 #include <linux/clk/at91_pmc.h>
 #include "pm.h"
+#include "generated/at91_pm_data-offsets.h"
 
 #define	SRAMC_SELF_FRESH_ACTIVE		0x01
 #define	SRAMC_SELF_FRESH_EXIT		0x00
@@ -72,13 +73,9 @@ tmp2	.req	r5
 	.arm
 
 /*
- * void at91_pm_suspend_in_sram(void __iomem *pmc, void __iomem *sdramc,
- *			void __iomem *ramc1, int memctrl)
+ * void at91_suspend_sram_fn(struct at91_pm_data*)
  * @input param:
- * 	@r0: base address of AT91_PMC
- *  	@r1: base address of SDRAM Controller (SDRAM, DDRSDR, or AT91_SYS)
- *	@r2: base address of second SDRAM Controller or 0 if not present
- *	@r3: pm information
+ * 	@r0: base address of struct at91_pm_data
  */
 /* at91_pm_suspend_in_sram must be 8-byte aligned per the requirements of fncpy() */
 	.align 3
@@ -90,16 +87,16 @@ ENTRY(at91_pm_suspend_in_sram)
 	mov	tmp1, #0
 	mcr	p15, 0, tmp1, c7, c10, 4
 
-	str	r0, .pmc_base
-	str	r1, .sramc_base
-	str	r2, .sramc1_base
-
-	and	r0, r3, #AT91_PM_MEMTYPE_MASK
-	str	r0, .memtype
-
-	lsr	r0, r3, #AT91_PM_MODE_OFFSET
-	and	r0, r0, #AT91_PM_MODE_MASK
-	str	r0, .pm_mode
+	ldr	tmp1, [r0, #PM_DATA_PMC]
+	str	tmp1, .pmc_base
+	ldr	tmp1, [r0, #PM_DATA_RAMC0]
+	str	tmp1, .sramc_base
+	ldr	tmp1, [r0, #PM_DATA_RAMC1]
+	str	tmp1, .sramc1_base
+	ldr	tmp1, [r0, #PM_DATA_MEMCTRL]
+	str	tmp1, .memtype
+	ldr	tmp1, [r0, #PM_DATA_MODE]
+	str	tmp1, .pm_mode
 
 	/* Active the self-refresh mode */
 	mov	r0, #SRAMC_SELF_FRESH_ACTIVE
diff --git a/arch/arm/mach-at91/sama5.c b/arch/arm/mach-at91/sama5.c
index b272c45b400f..6d157d0ead8e 100644
--- a/arch/arm/mach-at91/sama5.c
+++ b/arch/arm/mach-at91/sama5.c
@@ -15,60 +15,10 @@
 #include <asm/system_misc.h>
 
 #include "generic.h"
-#include "soc.h"
-
-static const struct at91_soc sama5_socs[] = {
-	AT91_SOC(SAMA5D2_CIDR_MATCH, SAMA5D21CU_EXID_MATCH,
-		 "sama5d21", "sama5d2"),
-	AT91_SOC(SAMA5D2_CIDR_MATCH, SAMA5D22CU_EXID_MATCH,
-		 "sama5d22", "sama5d2"),
-	AT91_SOC(SAMA5D2_CIDR_MATCH, SAMA5D23CU_EXID_MATCH,
-		 "sama5d23", "sama5d2"),
-	AT91_SOC(SAMA5D2_CIDR_MATCH, SAMA5D24CX_EXID_MATCH,
-		 "sama5d24", "sama5d2"),
-	AT91_SOC(SAMA5D2_CIDR_MATCH, SAMA5D24CU_EXID_MATCH,
-		 "sama5d24", "sama5d2"),
-	AT91_SOC(SAMA5D2_CIDR_MATCH, SAMA5D26CU_EXID_MATCH,
-		 "sama5d26", "sama5d2"),
-	AT91_SOC(SAMA5D2_CIDR_MATCH, SAMA5D27CU_EXID_MATCH,
-		 "sama5d27", "sama5d2"),
-	AT91_SOC(SAMA5D2_CIDR_MATCH, SAMA5D27CN_EXID_MATCH,
-		 "sama5d27", "sama5d2"),
-	AT91_SOC(SAMA5D2_CIDR_MATCH, SAMA5D28CU_EXID_MATCH,
-		 "sama5d28", "sama5d2"),
-	AT91_SOC(SAMA5D2_CIDR_MATCH, SAMA5D28CN_EXID_MATCH,
-		 "sama5d28", "sama5d2"),
-	AT91_SOC(SAMA5D3_CIDR_MATCH, SAMA5D31_EXID_MATCH,
-		 "sama5d31", "sama5d3"),
-	AT91_SOC(SAMA5D3_CIDR_MATCH, SAMA5D33_EXID_MATCH,
-		 "sama5d33", "sama5d3"),
-	AT91_SOC(SAMA5D3_CIDR_MATCH, SAMA5D34_EXID_MATCH,
-		 "sama5d34", "sama5d3"),
-	AT91_SOC(SAMA5D3_CIDR_MATCH, SAMA5D35_EXID_MATCH,
-		 "sama5d35", "sama5d3"),
-	AT91_SOC(SAMA5D3_CIDR_MATCH, SAMA5D36_EXID_MATCH,
-		 "sama5d36", "sama5d3"),
-	AT91_SOC(SAMA5D4_CIDR_MATCH, SAMA5D41_EXID_MATCH,
-		 "sama5d41", "sama5d4"),
-	AT91_SOC(SAMA5D4_CIDR_MATCH, SAMA5D42_EXID_MATCH,
-		 "sama5d42", "sama5d4"),
-	AT91_SOC(SAMA5D4_CIDR_MATCH, SAMA5D43_EXID_MATCH,
-		 "sama5d43", "sama5d4"),
-	AT91_SOC(SAMA5D4_CIDR_MATCH, SAMA5D44_EXID_MATCH,
-		 "sama5d44", "sama5d4"),
-	{ /* sentinel */ },
-};
 
 static void __init sama5_dt_device_init(void)
 {
-	struct soc_device *soc;
-	struct device *soc_dev = NULL;
-
-	soc = at91_soc_init(sama5_socs);
-	if (soc != NULL)
-		soc_dev = soc_device_to_device(soc);
-
-	of_platform_default_populate(NULL, NULL, soc_dev);
+	of_platform_default_populate(NULL, NULL, NULL);
 	sama5_pm_init();
 }
 
diff --git a/arch/arm/mach-at91/soc.c b/arch/arm/mach-at91/soc.c
deleted file mode 100644
index c6fda75ddb89..000000000000
--- a/arch/arm/mach-at91/soc.c
+++ /dev/null
@@ -1,142 +0,0 @@
-/*
- * Copyright (C) 2015 Atmel
- *
- * Alexandre Belloni <alexandre.belloni@free-electrons.com
- * Boris Brezillon <boris.brezillon@free-electrons.com
- *
- * This file is licensed under the terms of the GNU General Public
- * License version 2.  This program is licensed "as is" without any
- * warranty of any kind, whether express or implied.
- *
- */
-
-#define pr_fmt(fmt)	"AT91: " fmt
-
-#include <linux/io.h>
-#include <linux/of.h>
-#include <linux/of_address.h>
-#include <linux/of_platform.h>
-#include <linux/slab.h>
-#include <linux/sys_soc.h>
-
-#include "soc.h"
-
-#define AT91_DBGU_CIDR			0x40
-#define AT91_DBGU_EXID			0x44
-#define AT91_CHIPID_CIDR		0x00
-#define AT91_CHIPID_EXID		0x04
-#define AT91_CIDR_VERSION(x)		((x) & 0x1f)
-#define AT91_CIDR_EXT			BIT(31)
-#define AT91_CIDR_MATCH_MASK		0x7fffffe0
-
-static int __init at91_get_cidr_exid_from_dbgu(u32 *cidr, u32 *exid)
-{
-	struct device_node *np;
-	void __iomem *regs;
-
-	np = of_find_compatible_node(NULL, NULL, "atmel,at91rm9200-dbgu");
-	if (!np)
-		np = of_find_compatible_node(NULL, NULL,
-					     "atmel,at91sam9260-dbgu");
-	if (!np)
-		return -ENODEV;
-
-	regs = of_iomap(np, 0);
-	of_node_put(np);
-
-	if (!regs) {
-		pr_warn("Could not map DBGU iomem range");
-		return -ENXIO;
-	}
-
-	*cidr = readl(regs + AT91_DBGU_CIDR);
-	*exid = readl(regs + AT91_DBGU_EXID);
-
-	iounmap(regs);
-
-	return 0;
-}
-
-static int __init at91_get_cidr_exid_from_chipid(u32 *cidr, u32 *exid)
-{
-	struct device_node *np;
-	void __iomem *regs;
-
-	np = of_find_compatible_node(NULL, NULL, "atmel,sama5d2-chipid");
-	if (!np)
-		return -ENODEV;
-
-	regs = of_iomap(np, 0);
-	of_node_put(np);
-
-	if (!regs) {
-		pr_warn("Could not map DBGU iomem range");
-		return -ENXIO;
-	}
-
-	*cidr = readl(regs + AT91_CHIPID_CIDR);
-	*exid = readl(regs + AT91_CHIPID_EXID);
-
-	iounmap(regs);
-
-	return 0;
-}
-
-struct soc_device * __init at91_soc_init(const struct at91_soc *socs)
-{
-	struct soc_device_attribute *soc_dev_attr;
-	const struct at91_soc *soc;
-	struct soc_device *soc_dev;
-	u32 cidr, exid;
-	int ret;
-
-	/*
-	 * With SAMA5D2 and later SoCs, CIDR and EXID registers are no more
-	 * in the dbgu device but in the chipid device whose purpose is only
-	 * to expose these two registers.
-	 */
-	ret = at91_get_cidr_exid_from_dbgu(&cidr, &exid);
-	if (ret)
-		ret = at91_get_cidr_exid_from_chipid(&cidr, &exid);
-	if (ret) {
-		if (ret == -ENODEV)
-			pr_warn("Could not find identification node");
-		return NULL;
-	}
-
-	for (soc = socs; soc->name; soc++) {
-		if (soc->cidr_match != (cidr & AT91_CIDR_MATCH_MASK))
-			continue;
-
-		if (!(cidr & AT91_CIDR_EXT) || soc->exid_match == exid)
-			break;
-	}
-
-	if (!soc->name) {
-		pr_warn("Could not find matching SoC description\n");
-		return NULL;
-	}
-
-	soc_dev_attr = kzalloc(sizeof(*soc_dev_attr), GFP_KERNEL);
-	if (!soc_dev_attr)
-		return NULL;
-
-	soc_dev_attr->family = soc->family;
-	soc_dev_attr->soc_id = soc->name;
-	soc_dev_attr->revision = kasprintf(GFP_KERNEL, "%X",
-					   AT91_CIDR_VERSION(cidr));
-	soc_dev = soc_device_register(soc_dev_attr);
-	if (IS_ERR(soc_dev)) {
-		kfree(soc_dev_attr->revision);
-		kfree(soc_dev_attr);
-		pr_warn("Could not register SoC device\n");
-		return NULL;
-	}
-
-	if (soc->family)
-		pr_info("Detected SoC family: %s\n", soc->family);
-	pr_info("Detected SoC: %s, revision %X\n", soc->name,
-		AT91_CIDR_VERSION(cidr));
-
-	return soc_dev;
-}
diff --git a/drivers/soc/Kconfig b/drivers/soc/Kconfig
index f09023f7ab11..45e5b13a3c02 100644
--- a/drivers/soc/Kconfig
+++ b/drivers/soc/Kconfig
@@ -1,5 +1,6 @@
 menu "SOC (System On Chip) specific Drivers"
 
+source "drivers/soc/atmel/Kconfig"
 source "drivers/soc/bcm/Kconfig"
 source "drivers/soc/fsl/Kconfig"
 source "drivers/soc/mediatek/Kconfig"
diff --git a/drivers/soc/Makefile b/drivers/soc/Makefile
index 05eae52a30b4..3467de7d3890 100644
--- a/drivers/soc/Makefile
+++ b/drivers/soc/Makefile
@@ -2,6 +2,7 @@
 # Makefile for the Linux Kernel SOC specific device drivers.
 #
 
+obj-$(CONFIG_ARCH_AT91)		+= atmel/
 obj-y				+= bcm/
 obj-$(CONFIG_ARCH_DOVE)		+= dove/
 obj-$(CONFIG_MACH_DOVE)		+= dove/
diff --git a/drivers/soc/atmel/Kconfig b/drivers/soc/atmel/Kconfig
new file mode 100644
index 000000000000..6242ebb41abb
--- /dev/null
+++ b/drivers/soc/atmel/Kconfig
@@ -0,0 +1,6 @@
+config AT91_SOC_ID
+	bool "SoC bus for Atmel ARM SoCs"
+	depends on ARCH_AT91 || COMPILE_TEST
+	default ARCH_AT91
+	help
+	  Include support for the SoC bus on the Atmel ARM SoCs.
diff --git a/drivers/soc/atmel/Makefile b/drivers/soc/atmel/Makefile
new file mode 100644
index 000000000000..2d92f32e4ea5
--- /dev/null
+++ b/drivers/soc/atmel/Makefile
@@ -0,0 +1 @@
+obj-$(CONFIG_AT91_SOC_ID) += soc.o
diff --git a/drivers/soc/atmel/soc.c b/drivers/soc/atmel/soc.c
new file mode 100644
index 000000000000..4790094b498e
--- /dev/null
+++ b/drivers/soc/atmel/soc.c
@@ -0,0 +1,231 @@
+/*
+ * Copyright (C) 2015 Atmel
+ *
+ * Alexandre Belloni <alexandre.belloni@free-electrons.com
+ * Boris Brezillon <boris.brezillon@free-electrons.com
+ *
+ * This file is licensed under the terms of the GNU General Public
+ * License version 2.  This program is licensed "as is" without any
+ * warranty of any kind, whether express or implied.
+ *
+ */
+
+#define pr_fmt(fmt)	"AT91: " fmt
+
+#include <linux/io.h>
+#include <linux/of.h>
+#include <linux/of_address.h>
+#include <linux/of_platform.h>
+#include <linux/slab.h>
+#include <linux/sys_soc.h>
+
+#include "soc.h"
+
+#define AT91_DBGU_CIDR			0x40
+#define AT91_DBGU_EXID			0x44
+#define AT91_CHIPID_CIDR		0x00
+#define AT91_CHIPID_EXID		0x04
+#define AT91_CIDR_VERSION(x)		((x) & 0x1f)
+#define AT91_CIDR_EXT			BIT(31)
+#define AT91_CIDR_MATCH_MASK		0x7fffffe0
+
+static const struct at91_soc __initconst socs[] = {
+#ifdef CONFIG_SOC_AT91RM9200
+	AT91_SOC(AT91RM9200_CIDR_MATCH, 0, "at91rm9200 BGA", "at91rm9200"),
+#endif
+#ifdef CONFIG_SOC_AT91SAM9
+	AT91_SOC(AT91SAM9260_CIDR_MATCH, 0, "at91sam9260", NULL),
+	AT91_SOC(AT91SAM9261_CIDR_MATCH, 0, "at91sam9261", NULL),
+	AT91_SOC(AT91SAM9263_CIDR_MATCH, 0, "at91sam9263", NULL),
+	AT91_SOC(AT91SAM9G20_CIDR_MATCH, 0, "at91sam9g20", NULL),
+	AT91_SOC(AT91SAM9RL64_CIDR_MATCH, 0, "at91sam9rl64", NULL),
+	AT91_SOC(AT91SAM9G45_CIDR_MATCH, AT91SAM9M11_EXID_MATCH,
+		 "at91sam9m11", "at91sam9g45"),
+	AT91_SOC(AT91SAM9G45_CIDR_MATCH, AT91SAM9M10_EXID_MATCH,
+		 "at91sam9m10", "at91sam9g45"),
+	AT91_SOC(AT91SAM9G45_CIDR_MATCH, AT91SAM9G46_EXID_MATCH,
+		 "at91sam9g46", "at91sam9g45"),
+	AT91_SOC(AT91SAM9G45_CIDR_MATCH, AT91SAM9G45_EXID_MATCH,
+		 "at91sam9g45", "at91sam9g45"),
+	AT91_SOC(AT91SAM9X5_CIDR_MATCH, AT91SAM9G15_EXID_MATCH,
+		 "at91sam9g15", "at91sam9x5"),
+	AT91_SOC(AT91SAM9X5_CIDR_MATCH, AT91SAM9G35_EXID_MATCH,
+		 "at91sam9g35", "at91sam9x5"),
+	AT91_SOC(AT91SAM9X5_CIDR_MATCH, AT91SAM9X35_EXID_MATCH,
+		 "at91sam9x35", "at91sam9x5"),
+	AT91_SOC(AT91SAM9X5_CIDR_MATCH, AT91SAM9G25_EXID_MATCH,
+		 "at91sam9g25", "at91sam9x5"),
+	AT91_SOC(AT91SAM9X5_CIDR_MATCH, AT91SAM9X25_EXID_MATCH,
+		 "at91sam9x25", "at91sam9x5"),
+	AT91_SOC(AT91SAM9N12_CIDR_MATCH, AT91SAM9CN12_EXID_MATCH,
+		 "at91sam9cn12", "at91sam9n12"),
+	AT91_SOC(AT91SAM9N12_CIDR_MATCH, AT91SAM9N12_EXID_MATCH,
+		 "at91sam9n12", "at91sam9n12"),
+	AT91_SOC(AT91SAM9N12_CIDR_MATCH, AT91SAM9CN11_EXID_MATCH,
+		 "at91sam9cn11", "at91sam9n12"),
+	AT91_SOC(AT91SAM9XE128_CIDR_MATCH, 0, "at91sam9xe128", "at91sam9xe128"),
+	AT91_SOC(AT91SAM9XE256_CIDR_MATCH, 0, "at91sam9xe256", "at91sam9xe256"),
+	AT91_SOC(AT91SAM9XE512_CIDR_MATCH, 0, "at91sam9xe512", "at91sam9xe512"),
+#endif
+#ifdef CONFIG_SOC_SAMA5
+	AT91_SOC(SAMA5D2_CIDR_MATCH, SAMA5D21CU_EXID_MATCH,
+		 "sama5d21", "sama5d2"),
+	AT91_SOC(SAMA5D2_CIDR_MATCH, SAMA5D22CU_EXID_MATCH,
+		 "sama5d22", "sama5d2"),
+	AT91_SOC(SAMA5D2_CIDR_MATCH, SAMA5D23CU_EXID_MATCH,
+		 "sama5d23", "sama5d2"),
+	AT91_SOC(SAMA5D2_CIDR_MATCH, SAMA5D24CX_EXID_MATCH,
+		 "sama5d24", "sama5d2"),
+	AT91_SOC(SAMA5D2_CIDR_MATCH, SAMA5D24CU_EXID_MATCH,
+		 "sama5d24", "sama5d2"),
+	AT91_SOC(SAMA5D2_CIDR_MATCH, SAMA5D26CU_EXID_MATCH,
+		 "sama5d26", "sama5d2"),
+	AT91_SOC(SAMA5D2_CIDR_MATCH, SAMA5D27CU_EXID_MATCH,
+		 "sama5d27", "sama5d2"),
+	AT91_SOC(SAMA5D2_CIDR_MATCH, SAMA5D27CN_EXID_MATCH,
+		 "sama5d27", "sama5d2"),
+	AT91_SOC(SAMA5D2_CIDR_MATCH, SAMA5D28CU_EXID_MATCH,
+		 "sama5d28", "sama5d2"),
+	AT91_SOC(SAMA5D2_CIDR_MATCH, SAMA5D28CN_EXID_MATCH,
+		 "sama5d28", "sama5d2"),
+	AT91_SOC(SAMA5D3_CIDR_MATCH, SAMA5D31_EXID_MATCH,
+		 "sama5d31", "sama5d3"),
+	AT91_SOC(SAMA5D3_CIDR_MATCH, SAMA5D33_EXID_MATCH,
+		 "sama5d33", "sama5d3"),
+	AT91_SOC(SAMA5D3_CIDR_MATCH, SAMA5D34_EXID_MATCH,
+		 "sama5d34", "sama5d3"),
+	AT91_SOC(SAMA5D3_CIDR_MATCH, SAMA5D35_EXID_MATCH,
+		 "sama5d35", "sama5d3"),
+	AT91_SOC(SAMA5D3_CIDR_MATCH, SAMA5D36_EXID_MATCH,
+		 "sama5d36", "sama5d3"),
+	AT91_SOC(SAMA5D4_CIDR_MATCH, SAMA5D41_EXID_MATCH,
+		 "sama5d41", "sama5d4"),
+	AT91_SOC(SAMA5D4_CIDR_MATCH, SAMA5D42_EXID_MATCH,
+		 "sama5d42", "sama5d4"),
+	AT91_SOC(SAMA5D4_CIDR_MATCH, SAMA5D43_EXID_MATCH,
+		 "sama5d43", "sama5d4"),
+	AT91_SOC(SAMA5D4_CIDR_MATCH, SAMA5D44_EXID_MATCH,
+		 "sama5d44", "sama5d4"),
+#endif
+	{ /* sentinel */ },
+};
+
+static int __init at91_get_cidr_exid_from_dbgu(u32 *cidr, u32 *exid)
+{
+	struct device_node *np;
+	void __iomem *regs;
+
+	np = of_find_compatible_node(NULL, NULL, "atmel,at91rm9200-dbgu");
+	if (!np)
+		np = of_find_compatible_node(NULL, NULL,
+					     "atmel,at91sam9260-dbgu");
+	if (!np)
+		return -ENODEV;
+
+	regs = of_iomap(np, 0);
+	of_node_put(np);
+
+	if (!regs) {
+		pr_warn("Could not map DBGU iomem range");
+		return -ENXIO;
+	}
+
+	*cidr = readl(regs + AT91_DBGU_CIDR);
+	*exid = readl(regs + AT91_DBGU_EXID);
+
+	iounmap(regs);
+
+	return 0;
+}
+
+static int __init at91_get_cidr_exid_from_chipid(u32 *cidr, u32 *exid)
+{
+	struct device_node *np;
+	void __iomem *regs;
+
+	np = of_find_compatible_node(NULL, NULL, "atmel,sama5d2-chipid");
+	if (!np)
+		return -ENODEV;
+
+	regs = of_iomap(np, 0);
+	of_node_put(np);
+
+	if (!regs) {
+		pr_warn("Could not map DBGU iomem range");
+		return -ENXIO;
+	}
+
+	*cidr = readl(regs + AT91_CHIPID_CIDR);
+	*exid = readl(regs + AT91_CHIPID_EXID);
+
+	iounmap(regs);
+
+	return 0;
+}
+
+struct soc_device * __init at91_soc_init(const struct at91_soc *socs)
+{
+	struct soc_device_attribute *soc_dev_attr;
+	const struct at91_soc *soc;
+	struct soc_device *soc_dev;
+	u32 cidr, exid;
+	int ret;
+
+	/*
+	 * With SAMA5D2 and later SoCs, CIDR and EXID registers are no more
+	 * in the dbgu device but in the chipid device whose purpose is only
+	 * to expose these two registers.
+	 */
+	ret = at91_get_cidr_exid_from_dbgu(&cidr, &exid);
+	if (ret)
+		ret = at91_get_cidr_exid_from_chipid(&cidr, &exid);
+	if (ret) {
+		if (ret == -ENODEV)
+			pr_warn("Could not find identification node");
+		return NULL;
+	}
+
+	for (soc = socs; soc->name; soc++) {
+		if (soc->cidr_match != (cidr & AT91_CIDR_MATCH_MASK))
+			continue;
+
+		if (!(cidr & AT91_CIDR_EXT) || soc->exid_match == exid)
+			break;
+	}
+
+	if (!soc->name) {
+		pr_warn("Could not find matching SoC description\n");
+		return NULL;
+	}
+
+	soc_dev_attr = kzalloc(sizeof(*soc_dev_attr), GFP_KERNEL);
+	if (!soc_dev_attr)
+		return NULL;
+
+	soc_dev_attr->family = soc->family;
+	soc_dev_attr->soc_id = soc->name;
+	soc_dev_attr->revision = kasprintf(GFP_KERNEL, "%X",
+					   AT91_CIDR_VERSION(cidr));
+	soc_dev = soc_device_register(soc_dev_attr);
+	if (IS_ERR(soc_dev)) {
+		kfree(soc_dev_attr->revision);
+		kfree(soc_dev_attr);
+		pr_warn("Could not register SoC device\n");
+		return NULL;
+	}
+
+	if (soc->family)
+		pr_info("Detected SoC family: %s\n", soc->family);
+	pr_info("Detected SoC: %s, revision %X\n", soc->name,
+		AT91_CIDR_VERSION(cidr));
+
+	return soc_dev;
+}
+
+static int __init atmel_soc_device_init(void)
+{
+	at91_soc_init(socs);
+
+	return 0;
+}
+subsys_initcall(atmel_soc_device_init);
diff --git a/arch/arm/mach-at91/soc.h b/drivers/soc/atmel/soc.h
index 228efded5085..228efded5085 100644
--- a/arch/arm/mach-at91/soc.h
+++ b/drivers/soc/atmel/soc.h