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davinci: DA850/OMAP-L138: add voltage regulation support

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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: Sekhar Nori <nsekhar@ti.com>
Signed-off-by: Kevin Hilman <khilman@deeprootsystems.com>
This commit is contained in:
Sekhar Nori 2009-09-22 21:14:02 +05:30 committed by Kevin Hilman
parent 683b1e1f0e
commit 35f9acd8bd
1 changed files with 43 additions and 0 deletions
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43
arch/arm/mach-davinci/da850.c
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@ -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),