From e70cc438311c753edc1f19214ffc090061e60880 Mon Sep 17 00:00:00 2001 From: Simon Glass Date: Wed, 20 Jan 2016 19:43:02 -0700 Subject: dm: clk: Add support for decoding clocks from the device tree Add a method which can locate a clock for a device, given its index. This uses the normal device tree bindings to return the clock device and the first argument which is normally used as a peripheral ID in U-Boot. Signed-off-by: Simon Glass Reviewed-by: Masahiro Yamada --- include/clk.h | 24 ++++++++++++++++++++++++ 1 file changed, 24 insertions(+) (limited to 'include') diff --git a/include/clk.h b/include/clk.h index 941808a..ca20c3d 100644 --- a/include/clk.h +++ b/include/clk.h @@ -8,6 +8,7 @@ #ifndef _CLK_H_ #define _CLK_H_ +#include #include struct udevice; @@ -105,4 +106,27 @@ ulong clk_get_periph_rate(struct udevice *dev, int periph); */ ulong clk_set_periph_rate(struct udevice *dev, int periph, ulong rate); +#if CONFIG_IS_ENABLED(OF_CONTROL) +/** + * clk_get_by_index() - look up a clock referenced by a device + * + * Parse a device's 'clocks' list, returning information on the indexed clock, + * ensuring that it is activated. + * + * @dev: Device containing the clock reference + * @index: Clock index to return (0 = first) + * @clk_devp: Returns clock device + * @return: Peripheral ID for the device to control. This is the first + * argument after the clock node phandle. If there is no arguemnt, + * returns 0. Return -ve error code on any error + */ +int clk_get_by_index(struct udevice *dev, int index, struct udevice **clk_devp); +#else +static inline int clk_get_by_index(struct udevice *dev, int index, + struct udevice **clk_devp) +{ + return -ENOSYS; +} +#endif + #endif /* _CLK_H_ */ -- cgit v1.1