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

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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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1
include/linux/mfd/tps65910.h
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@@ -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];