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mfd: Add support for enabling tps65910 external 32-kHz oscillator 

Add flag to platform data to enable external 32-kHz crystal oscillator
(or square wave) input.

The tps6591x can use either an internal 32-kHz RC oscillator or an
external crystal (or square wave) to generate the 32-kHz clock.

The default setting depends on the selected boot mode. In boot mode 00
the internal RC oscillator is used at power-on, but the external crystal
oscillator (or square wave) can be enabled by clearing the ck32k_ctrl
flag in the device control register.

Note that there is no way to switch from the external crystal oscillator
to the internal RC oscillator.

Signed-off-by: Johan Hovold <jhovold@gmail.com>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
This commit is contained in:
Johan Hovold 2012-06-28 12:20:21 +02:00 committed by Samuel Ortiz
parent 54210c97c8
commit 712db99df1
2 changed files with 21 additions and 1 deletions
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21
drivers/mfd/tps65910.c
View File

@ -68,6 +68,25 @@ static const struct regmap_config tps65910_regmap_config = {
.cache_type = REGCACHE_RBTREE,
};
static int __devinit tps65910_misc_init(struct tps65910 *tps65910,
struct tps65910_board *pmic_pdata)
{
struct device *dev = tps65910->dev;
int ret;
if (pmic_pdata->en_ck32k_xtal) {
ret = tps65910_reg_clear_bits(tps65910,
TPS65910_DEVCTRL,
DEVCTRL_CK32K_CTRL_MASK);
if (ret < 0) {
dev_err(dev, "clear ck32k_ctrl failed: %d\n", ret);
return ret;
}
}
return 0;
}
static int __devinit tps65910_sleepinit(struct tps65910 *tps65910,
struct tps65910_board *pmic_pdata)
{
@ -243,7 +262,7 @@ static __devinit int tps65910_i2c_probe(struct i2c_client *i2c,
init_data->irq_base = pmic_plat_data->irq_base;
tps65910_irq_init(tps65910, init_data->irq, init_data);
tps65910_misc_init(tps65910, pmic_plat_data);
tps65910_sleepinit(tps65910, pmic_plat_data);
return ret;

1
include/linux/mfd/tps65910.h
View File

@ -807,6 +807,7 @@ struct tps65910_board {
int irq_base;
int vmbch_threshold;
int vmbch2_threshold;
bool en_ck32k_xtal;
bool en_dev_slp;
struct tps65910_sleep_keepon_data *slp_keepon;
bool en_gpio_sleep[TPS6591X_MAX_NUM_GPIO];