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Commit 35f9acd8 authored by Sekhar Nori's avatar Sekhar Nori Committed by Kevin Hilman
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davinci: DA850/OMAP-L138: add voltage regulation support 



This patch adds support for regulating the CVDD voltage for the
DA850/OMAP-L138 platform.

The CVDD min and max values for each OPP have been obtained from
section 5.2 "Recommended Operating Conditions" of SPRS586

Signed-off-by: default avatarSekhar Nori <nsekhar@ti.com>
Signed-off-by: default avatarKevin Hilman <khilman@deeprootsystems.com>
parent 683b1e1f

arch/arm/mach-davinci/da850.c

+43 −0
Original line number Diff line number Diff line
@@ -16,6 +16,7 @@ 
#include <linux/clk.h>

#include <linux/platform_device.h>

#include <linux/cpufreq.h>

#include <linux/regulator/consumer.h>



#include <asm/mach/map.h>
@@ -844,6 +845,8 @@ struct da850_opp { 
	unsigned int	prediv;

	unsigned int	mult;

	unsigned int	postdiv;

	unsigned int	cvdd_min; /* in uV */

	unsigned int	cvdd_max; /* in uV */

};



static const struct da850_opp da850_opp_300 = {
@@ -851,6 +854,8 @@ static const struct da850_opp da850_opp_300 = { 
	.prediv		= 1,

	.mult		= 25,

	.postdiv	= 2,

	.cvdd_min	= 1140000,

	.cvdd_max	= 1320000,

};



static const struct da850_opp da850_opp_200 = {
@@ -858,6 +863,8 @@ static const struct da850_opp da850_opp_200 = { 
	.prediv		= 1,

	.mult		= 25,

	.postdiv	= 3,

	.cvdd_min	= 1050000,

	.cvdd_max	= 1160000,

};



static const struct da850_opp da850_opp_96 = {
@@ -865,6 +872,8 @@ static const struct da850_opp da850_opp_96 = { 
	.prediv		= 1,

	.mult		= 20,

	.postdiv	= 5,

	.cvdd_min	= 950000,

	.cvdd_max	= 1050000,

};



#define OPP(freq) 		\
@@ -973,6 +982,40 @@ static int da850_round_armrate(struct clk *clk, unsigned long rate) 
}

#endif



#ifdef CONFIG_REGULATOR

static struct regulator *cvdd;



static int da850_set_voltage(unsigned int index)

{

	struct da850_opp *opp;



	if (!cvdd)

		return -ENODEV;



	opp = (struct da850_opp *) da850_freq_table[index].index;



	return regulator_set_voltage(cvdd, opp->cvdd_min, opp->cvdd_max);

}



static int __init da850_regulator_init(void)

{

	int ret = 0;



	cvdd = regulator_get(NULL, "cvdd");

	if (WARN(IS_ERR(cvdd), "Unable to obtain voltage regulator for CVDD;"

					" voltage scaling unsupported\n")) {

		ret = PTR_ERR(cvdd);

		goto out;

	}



	cpufreq_info.set_voltage = da850_set_voltage;



out:

	return ret;

}

device_initcall(da850_regulator_init);

#endif



static struct davinci_soc_info davinci_soc_info_da850 = {

	.io_desc		= da850_io_desc,

	.io_desc_num		= ARRAY_SIZE(da850_io_desc),