diff options
| author | Simon Glass <sjg@chromium.org> | 2016-01-20 19:43:02 -0700 |
|---|---|---|
| committer | Simon Glass <sjg@chromium.org> | 2016-01-21 19:47:29 -0700 |
| commit | e70cc438311c753edc1f19214ffc090061e60880 (patch) | |
| tree | f7ab2b660954da09ef3cbecd24fb3fa45fb8fe58 /include | |
| parent | b21e20b255a02393727c93b1927a381ce3008fa4 (diff) | |
| download | u-boot-e70cc438311c753edc1f19214ffc090061e60880.tar.gz | |
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 <sjg@chromium.org>
Reviewed-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Diffstat (limited to 'include')
| -rw-r--r-- | include/clk.h | 24 |
1 files changed, 24 insertions, 0 deletions
diff --git a/include/clk.h b/include/clk.h index 941808a50e..ca20c3dd27 100644 --- a/include/clk.h +++ b/include/clk.h @@ -8,6 +8,7 @@ #ifndef _CLK_H_ #define _CLK_H_ +#include <errno.h> #include <linux/types.h> 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_ */ |