u-boot.git/include/clk.h, branch v2016.05

dm: clk: Add support for decoding clocks from the device tree

2016-01-22T02:47:29+00:00

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

clk: add API to enable clock

2016-01-21T02:06:23+00:00

The most basic thing for clock is to enable it, but it is missing
in this uclass.

Signed-off-by: Masahiro Yamada 
Acked-by: Simon Glass

clk: add needed include and declaration to include/clk.h

2016-01-21T02:06:23+00:00

This header uses ulong, so it needs to include .
Likewise, "struct udevice" must be declared before it is used.

Signed-off-by: Masahiro Yamada 
Acked-by: Simon Glass

clk: fix comments in include/clk.h

2016-01-21T02:06:23+00:00

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 
Acked-by: Simon Glass

dm: Add a clock uclass

2015-07-21T23:39:29+00:00

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

common: Add new clk command

2014-02-04T15:32:20+00:00

Command provides just dump subcommand for showing clock
frequencies in a soc.

Signed-off-by: Michal Simek 
Acked-by: Stefano Babic