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>
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 @@
.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 @@
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;