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authorSekhar Nori <nsekhar@ti.com>2010-12-20 21:31:34 +0530
committerKevin Hilman <khilman@deeprootsystems.com>2010-12-22 11:45:29 -0800
commit28bd2c341120db346f30b3ba11b4eac06b2cc981 (patch)
tree0d8ffe7c3fa118cb6afe063fe9601eefa213ddc7 /arch/arm/mach-davinci/board-da850-evm.c
parent39e145500458bd68d1d33adfa256886900b1597b (diff)
downloadblackbird-obmc-linux-28bd2c341120db346f30b3ba11b4eac06b2cc981.tar.gz
blackbird-obmc-linux-28bd2c341120db346f30b3ba11b4eac06b2cc981.zip
davinci: am18x/da850/omap-l138 evm: add support for higher speed grades
Apart from the regular AM18x/DA850/OMAP-L138 SoC operating at 300MHz, these SoCs have variants that can operate at a maximum of 456MHz. Variants at 408Mhz and 375 Mhz are available as well. Not all silicon is qualified to run at higher speeds and unfortunately the maximum speed the chip can support can only be determined from the label on the package (not software readable). The EVM hardware for all these variants is the same (except for the actual SoC populated). U-Boot on the EVM sets up ATAG_REVISION to inform the OS regarding the speed grade supported by the silicon. We use this information to pass on the speed grade information to the SoC code. Signed-off-by: Sekhar Nori <nsekhar@ti.com> Signed-off-by: Kevin Hilman <khilman@deeprootsystems.com>
Diffstat (limited to 'arch/arm/mach-davinci/board-da850-evm.c')
-rw-r--r--arch/arm/mach-davinci/board-da850-evm.c25
1 files changed, 23 insertions, 2 deletions
diff --git a/arch/arm/mach-davinci/board-da850-evm.c b/arch/arm/mach-davinci/board-da850-evm.c
index 2139ce8606cf..b01fb2ab944a 100644
--- a/arch/arm/mach-davinci/board-da850-evm.c
+++ b/arch/arm/mach-davinci/board-da850-evm.c
@@ -822,7 +822,7 @@ static struct regulator_init_data tps65070_regulator_data[] = {
{
.constraints = {
.min_uV = 950000,
- .max_uV = 1320000,
+ .max_uV = 1350000,
.valid_ops_mask = (REGULATOR_CHANGE_VOLTAGE |
REGULATOR_CHANGE_STATUS),
.boot_on = 1,
@@ -1018,6 +1018,27 @@ static struct edma_rsv_info *da850_edma_rsv[2] = {
&da850_edma_cc1_rsv,
};
+#ifdef CONFIG_CPU_FREQ
+static __init int da850_evm_init_cpufreq(void)
+{
+ switch (system_rev & 0xF) {
+ case 3:
+ da850_max_speed = 456000;
+ break;
+ case 2:
+ da850_max_speed = 408000;
+ break;
+ case 1:
+ da850_max_speed = 372000;
+ break;
+ }
+
+ return da850_register_cpufreq("pll0_sysclk3");
+}
+#else
+static __init int da850_evm_init_cpufreq(void) { return 0; }
+#endif
+
static __init void da850_evm_init(void)
{
int ret;
@@ -1118,7 +1139,7 @@ static __init void da850_evm_init(void)
if (ret)
pr_warning("da850_evm_init: rtc setup failed: %d\n", ret);
- ret = da850_register_cpufreq("pll0_sysclk3");
+ ret = da850_evm_init_cpufreq();
if (ret)
pr_warning("da850_evm_init: cpufreq registration failed: %d\n",
ret);
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