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2016-01-21dm: clk: Add support for decoding clocks from the device treeSimon Glass
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>
2016-01-20clk: add API to enable clockMasahiro Yamada
The most basic thing for clock is to enable it, but it is missing in this uclass. Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com> Acked-by: Simon Glass <sjg@chromium.org>
2016-01-20clk: add needed include and declaration to include/clk.hMasahiro Yamada
This header uses ulong, so it needs to include <linux/types.h>. Likewise, "struct udevice" must be declared before it is used. Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com> Acked-by: Simon Glass <sjg@chromium.org>
2016-01-20clk: fix comments in include/clk.hMasahiro Yamada
The comment about get_periph_rate() is the same as that of set_periph_rate(). I am fixing typos here and there while I am in this file. Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com> Acked-by: Simon Glass <sjg@chromium.org>
2015-07-21dm: Add a clock uclassSimon Glass
Clocks are an important feature of platforms and have become increasing complex with time. Most modern SoCs have multiple PLLs and dozens of clock dividers which distribute clocks to on-chip peripherals. Some SoC implementations have a clock API which is private to that SoC family, e.g. Tegra and Exynos. This is useful but it would be better to have a common API that can be understood and used throughout U-Boot. Add a simple clock API as a starting point. It supports querying and setting the rate of a clock. Each clock is a device. To reduce memory and processing overhead the concept of peripheral clocks is provided. These do not need to be explicit devices - it is possible to write a driver that can adjust the I2C clock (for example) without an explicit I2C clock device. This can dramatically reduce the number of devices (and associated overhead) in a complex SoC. Clocks are referenced by a number, and it is expected that SoCs will define that numbering themselves via an enum. Signed-off-by: Simon Glass <sjg@chromium.org>
2014-02-04common: Add new clk commandMichal Simek
Command provides just dump subcommand for showing clock frequencies in a soc. Signed-off-by: Michal Simek <michal.simek@xilinx.com> Acked-by: Stefano Babic <sbabic@denx.de>