clk: move struct clk_mux into header ...

To make it reusable in a composite clock.

Signed-off-by: Lucas Stach <l.stach@pengutronix.de>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

CLK: clk-mux: Respect CLK_MUX_HIWORD_MASK flag ...

It is required for Rockchip SoCs where clock settings registers have
write-enable mask in high word.

Signed-off-by: Andrey Panov <rockford@yandex.ru>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

clk: Add parent round/set rate for mux and gate ...

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

clk: clk-mux: pass clk flags from initializers ...

struct clk has a flags field, let the clk-mux initializers set this
field.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

drivers/clk/clk-mux.c: Fix sparse warning ...

drivers/clk/clk-mux.c:53:16: warning: symbol 'clk_mux_ops' was not declared. Should it be static?

Signed-off-by: Alexander Shiyan <shc_work@mail.ru>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

clk: allow to instanciate clk mux without registering it ...

Allows to reuse clk mux code within other clocks.

Signed-off-by: Lucas Stach <dev@lynxeye.de>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

clk: initial common clk support ...

This adds barebox common clk support loosely based on the Kernel common
clk support. differences are:

- barebox does not need prepare/unprepare
- no parent rate propagation for set_rate
- struct clk is not really encapsulated from the drivers

Along with the clk support we have support for some basic clk building
blocks:

- clk-fixed
- clk-fixed-factor
- clk-mux
- clk-divider

clk-fixed and clk-fixed-factor are completely generic, clk-mux and clk-divider
are currently the way i.MX muxes/dividers are implemented.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>