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 --- drivers/clk/clk-uclass.c | 28 ++++++++++++++++++++++++++++ 1 file changed, 28 insertions(+) (limited to 'drivers/clk/clk-uclass.c') diff --git a/drivers/clk/clk-uclass.c b/drivers/clk/clk-uclass.c index 19f6f07..8a4c568 100644 --- a/drivers/clk/clk-uclass.c +++ b/drivers/clk/clk-uclass.c @@ -12,6 +12,8 @@ #include #include +DECLARE_GLOBAL_DATA_PTR; + ulong clk_get_rate(struct udevice *dev) { struct clk_ops *ops = clk_get_ops(dev); @@ -62,6 +64,32 @@ ulong clk_set_periph_rate(struct udevice *dev, int periph, ulong rate) return ops->set_periph_rate(dev, periph, rate); } +#if CONFIG_IS_ENABLED(OF_CONTROL) +int clk_get_by_index(struct udevice *dev, int index, struct udevice **clk_devp) +{ + struct fdtdec_phandle_args args; + int ret; + + assert(*clk_devp); + ret = fdtdec_parse_phandle_with_args(gd->fdt_blob, dev->of_offset, + "clocks", "#clock-cells", 0, index, + &args); + if (ret) { + debug("%s: fdtdec_parse_phandle_with_args failed: err=%d\n", + __func__, ret); + return ret; + } + + ret = uclass_get_device_by_of_offset(UCLASS_CLK, args.node, clk_devp); + if (ret) { + debug("%s: uclass_get_device_by_of_offset failed: err=%d\n", + __func__, ret); + return ret; + } + return args.args_count > 0 ? args.args[0] : 0; +} +#endif + UCLASS_DRIVER(clk) = { .id = UCLASS_CLK, .name = "clk", -- cgit v1.1