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authorJohan Hovold <jhovold@gmail.com>2012-06-28 12:20:21 +0200
committerSamuel Ortiz <sameo@linux.intel.com>2012-07-09 00:16:14 +0200
commit712db99df155eeef7bbab8677d8a02d0eff50d11 (patch)
treea3fad6d54e08614df20385818702568afa9eed0f /drivers/mfd/tps65910.c
parent54210c97c8bfff67a4c5ec09ff797543bf291d6b (diff)
downloadop-kernel-dev-712db99df155eeef7bbab8677d8a02d0eff50d11.zip
op-kernel-dev-712db99df155eeef7bbab8677d8a02d0eff50d11.tar.gz
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.c21
1 files changed, 20 insertions, 1 deletions
diff --git a/drivers/mfd/tps65910.c b/drivers/mfd/tps65910.c
index be9e07b..b0526b7 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;
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