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mfd: Enable twl4030 32kHz oscillator low-power mode

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Allows TWL's 32kHz oscillator to go in low-power mode when
main battery voltage is running low.

Signed-off-by: Ilkka Koskinen <ilkka.koskinen@nokia.com>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
This commit is contained in:
Ilkka Koskinen 2009-10-22 14:14:09 +03:00 committed by Samuel Ortiz
parent 75b75722b4
commit 38a684963f
2 changed files with 12 additions and 2 deletions
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9
drivers/mfd/twl4030-core.c
View file

@ -183,6 +183,7 @@
#define HFCLK_FREQ_26_MHZ (2 << 0) #define HFCLK_FREQ_26_MHZ (2 << 0)
#define HFCLK_FREQ_38p4_MHZ (3 << 0) #define HFCLK_FREQ_38p4_MHZ (3 << 0)
#define HIGH_PERF_SQ (1 << 3) #define HIGH_PERF_SQ (1 << 3)
#define CK32K_LOWPWR_EN (1 << 7)
/* chip-specific feature flags, for i2c_device_id.driver_data */ /* chip-specific feature flags, for i2c_device_id.driver_data */
@ -695,7 +696,8 @@ static inline int __init unprotect_pm_master(void)
return e; return e;
} }
static void clocks_init(struct device *dev) static void clocks_init(struct device *dev,
struct twl4030_clock_init_data *clock)
{ {
int e = 0; int e = 0;
struct clk *osc; struct clk *osc;
@ -742,6 +744,9 @@ static void clocks_init(struct device *dev)
} }
ctrl |= HIGH_PERF_SQ; ctrl |= HIGH_PERF_SQ;
if (clock && clock->ck32k_lowpwr_enable)
ctrl |= CK32K_LOWPWR_EN;
e |= unprotect_pm_master(); e |= unprotect_pm_master();
/* effect->MADC+USB ck en */ /* effect->MADC+USB ck en */
e |= twl4030_i2c_write_u8(TWL4030_MODULE_PM_MASTER, ctrl, R_CFG_BOOT); e |= twl4030_i2c_write_u8(TWL4030_MODULE_PM_MASTER, ctrl, R_CFG_BOOT);
@ -820,7 +825,7 @@ twl4030_probe(struct i2c_client *client, const struct i2c_device_id *id)
inuse = true; inuse = true;
/* setup clock framework */ /* setup clock framework */
clocks_init(&client->dev); clocks_init(&client->dev, pdata->clock);
/* load power event scripts */ /* load power event scripts */
if (twl_has_power() && pdata->power) if (twl_has_power() && pdata->power)

5
include/linux/i2c/twl4030.h
View file

@ -313,6 +313,10 @@ int twl4030_i2c_read(u8 mod_no, u8 *value, u8 reg, unsigned num_bytes);
/*----------------------------------------------------------------------*/ /*----------------------------------------------------------------------*/
struct twl4030_clock_init_data {
bool ck32k_lowpwr_enable;
};
struct twl4030_bci_platform_data { struct twl4030_bci_platform_data {
int *battery_tmp_tbl; int *battery_tmp_tbl;
unsigned int tblsize; unsigned int tblsize;
@ -425,6 +429,7 @@ struct twl4030_codec_data {
struct twl4030_platform_data { struct twl4030_platform_data {
unsigned irq_base, irq_end; unsigned irq_base, irq_end;
struct twl4030_clock_init_data *clock;
struct twl4030_bci_platform_data *bci; struct twl4030_bci_platform_data *bci;
struct twl4030_gpio_platform_data *gpio; struct twl4030_gpio_platform_data *gpio;
struct twl4030_madc_platform_data *madc; struct twl4030_madc_platform_data *madc;