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davinci: am18x/da850/omap-l138: keep async clock constant with cpufreq

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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>
This commit is contained in:
Sekhar Nori 2010-07-20 16:46:51 +05:30 committed by Kevin Hilman
parent 30a2c5d2f0
commit b987c4b2c9
3 changed files with 11 additions and 3 deletions
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2
arch/arm/mach-davinci/board-da850-evm.c
View File

@ -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);

10
arch/arm/mach-davinci/da850.c
View File

@ -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);
}

2
arch/arm/mach-davinci/include/mach/da8xx.h
View File

@ -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);