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| author | Johan Hovold <jhovold@gmail.com> | 2012-06-28 12:20:21 +0200 |
|---|---|---|
| committer | Samuel Ortiz <sameo@linux.intel.com> | 2012-07-09 00:16:14 +0200 |
| commit | 712db99df155eeef7bbab8677d8a02d0eff50d11 (patch) | |
| tree | a3fad6d54e08614df20385818702568afa9eed0f /drivers/mfd/tps65910.c | |
| parent | 54210c97c8bfff67a4c5ec09ff797543bf291d6b (diff) | |
| download | linux-712db99df155eeef7bbab8677d8a02d0eff50d11.tar.gz linux-712db99df155eeef7bbab8677d8a02d0eff50d11.tar.bz2 linux-712db99df155eeef7bbab8677d8a02d0eff50d11.zip | |
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>
Diffstat (limited to 'drivers/mfd/tps65910.c')
| -rw-r--r-- | drivers/mfd/tps65910.c | 21 |
1 files changed, 20 insertions, 1 deletions
diff --git a/drivers/mfd/tps65910.c b/drivers/mfd/tps65910.c index be9e07b77325..b0526b7d6550 100644 --- a/drivers/mfd/tps65910.c +++ b/drivers/mfd/tps65910.c @@ -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; |