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authorSekhar Nori <nsekhar@ti.com>2010-07-20 16:46:51 +0530
committerKevin Hilman <khilman@deeprootsystems.com>2010-09-24 07:40:25 -0700
commitb987c4b2c9c9db2393f4c089e63d1734301214e5 (patch)
tree446b9ae602d8669e9e03107b976c9a88040b84ca /arch
parent30a2c5d2f0134df6175af26ce554aacaee304280 (diff)
downloadop-kernel-dev-b987c4b2c9c9db2393f4c089e63d1734301214e5.zip
op-kernel-dev-b987c4b2c9c9db2393f4c089e63d1734301214e5.tar.gz
davinci: am18x/da850/omap-l138: keep async clock constant with cpufreq
Keep PLL0 SYSCLK3 at a constant rate of 100MHz. This enables the AEMIF timing to remain valid even as the PLL0 output is changed by cpufreq driver to save power. Signed-off-by: Sekhar Nori <nsekhar@ti.com> Signed-off-by: Kevin Hilman <khilman@deeprootsystems.com>
Diffstat (limited to 'arch')
-rw-r--r--arch/arm/mach-davinci/board-da850-evm.c2
-rw-r--r--arch/arm/mach-davinci/da850.c10
-rw-r--r--arch/arm/mach-davinci/include/mach/da8xx.h2
3 files changed, 11 insertions, 3 deletions
diff --git a/arch/arm/mach-davinci/board-da850-evm.c b/arch/arm/mach-davinci/board-da850-evm.c
index f5f9472..c2800a9 100644
--- a/arch/arm/mach-davinci/board-da850-evm.c
+++ b/arch/arm/mach-davinci/board-da850-evm.c
@@ -787,7 +787,7 @@ static __init void da850_evm_init(void)
if (ret)
pr_warning("da850_evm_init: rtc setup failed: %d\n", ret);
- ret = da850_register_cpufreq();
+ ret = da850_register_cpufreq("pll0_sysclk3");
if (ret)
pr_warning("da850_evm_init: cpufreq registration failed: %d\n",
ret);
diff --git a/arch/arm/mach-davinci/da850.c b/arch/arm/mach-davinci/da850.c
index 6932d80..5af7cfb 100644
--- a/arch/arm/mach-davinci/da850.c
+++ b/arch/arm/mach-davinci/da850.c
@@ -86,6 +86,8 @@ static struct clk pll0_sysclk3 = {
.parent = &pll0_clk,
.flags = CLK_PLL,
.div_reg = PLLDIV3,
+ .set_rate = davinci_set_sysclk_rate,
+ .maxrate = 100000000,
};
static struct clk pll0_sysclk4 = {
@@ -929,10 +931,16 @@ static struct platform_device da850_cpufreq_device = {
.dev = {
.platform_data = &cpufreq_info,
},
+ .id = -1,
};
-int __init da850_register_cpufreq(void)
+int __init da850_register_cpufreq(char *async_clk)
{
+ /* cpufreq driver can help keep an "async" clock constant */
+ if (async_clk)
+ clk_add_alias("async", da850_cpufreq_device.name,
+ async_clk, NULL);
+
return platform_device_register(&da850_cpufreq_device);
}
diff --git a/arch/arm/mach-davinci/include/mach/da8xx.h b/arch/arm/mach-davinci/include/mach/da8xx.h
index 3c07059..2c3f418 100644
--- a/arch/arm/mach-davinci/include/mach/da8xx.h
+++ b/arch/arm/mach-davinci/include/mach/da8xx.h
@@ -78,7 +78,7 @@ int da8xx_register_lcdc(struct da8xx_lcdc_platform_data *pdata);
int da8xx_register_mmcsd0(struct davinci_mmc_config *config);
void __init da8xx_register_mcasp(int id, struct snd_platform_data *pdata);
int da8xx_register_rtc(void);
-int da850_register_cpufreq(void);
+int da850_register_cpufreq(char *async_clk);
int da8xx_register_cpuidle(void);
void __iomem * __init da8xx_get_mem_ctlr(void);
int da850_register_pm(struct platform_device *pdev);
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