dm: gpio: Add driver for MPC85XX GPIO controller

This patch adds a driver for the built-in GPIO controller of the MPC85XX
SoC (probably supporting other PowerQUICC III SoCs as well).

Each GPIO bank is identified by its own entry in the device tree, i.e.

gpio-controller@fc00 {
      #gpio-cells = <2>;
      compatible = "fsl,pq3-gpio";
      reg = <0xfc00 0x100>
}

By default, each bank is assumed to have 32 GPIOs, but the ngpios
setting is honored, so the number of GPIOs for each bank in configurable
to match the actual GPIO count of the SoC (e.g. the 32/32/23 banks of
the P1022 SoC).

The usual functions of GPIO drivers (setting input/output mode and output
value setting) are supported.

The driver has been tested on MPC85XX, but it is likely that other
PowerQUICC III devices will work as well.

Signed-off-by: Mario Six <mario.six@gdsys.cc>
Reviewed-by: Simon Glass <sjg@chromium.org>
Reviewed-by: York Sun <york.sun@nxp.com>

2 files changed, 4 insertions, 0 deletions

diff --git a/arch/powerpc/include/asm/arch-mpc85xx/gpio.h b/arch/powerpc/include/asm/arch-mpc85xx/gpio.h
index da7352abb2..41b6677bba 100644
--- a/arch/powerpc/include/asm/arch-mpc85xx/gpio.h
+++ b/arch/powerpc/include/asm/arch-mpc85xx/gpio.h
@@ -14,6 +14,8 @@
 #ifndef __ASM_ARCH_MX85XX_GPIO_H
 #define __ASM_ARCH_MX85XX_GPIO_H
 
+#ifndef CONFIG_MPC85XX_GPIO
 #include <asm/mpc85xx_gpio.h>
+#endif
 
 #endif
diff --git a/arch/powerpc/include/asm/immap_85xx.h b/arch/powerpc/include/asm/immap_85xx.h
index 07d2adf71f..c045a24d1a 100644
--- a/arch/powerpc/include/asm/immap_85xx.h
+++ b/arch/powerpc/include/asm/immap_85xx.h
@@ -265,6 +265,7 @@ typedef struct ccsr_pcix {
 #define PIWAR_WRITE_SNOOP	0x00005000
 #define PIWAR_MEM_2G		0x0000001e
 
+#ifndef CONFIG_MPC85XX_GPIO
 typedef struct ccsr_gpio {
 	u32	gpdir;
 	u32	gpodr;
@@ -273,6 +274,7 @@ typedef struct ccsr_gpio {
 	u32	gpimr;
 	u32	gpicr;
 } ccsr_gpio_t;
+#endif
 
 /* L2 Cache Registers */
 typedef struct ccsr_l2cache {