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Commit b987c4b2 authored by Sekhar Nori's avatar Sekhar Nori Committed by Kevin Hilman
Browse files

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: default avatarSekhar Nori <nsekhar@ti.com>
Signed-off-by: default avatarKevin Hilman <khilman@deeprootsystems.com>
parent 30a2c5d2

arch/arm/mach-davinci/board-da850-evm.c

+1 −1
Original line number Diff line number Diff line
@@ -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);

arch/arm/mach-davinci/da850.c

+9 −1
Original line number Diff line number Diff line
@@ -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);

}

arch/arm/mach-davinci/include/mach/da8xx.h

+1 −1
Original line number Diff line number Diff line
@@ -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);