clk: migrate to SPDX-License-Identifier use ...

Some of these are a product of source sync with Linux, the other were
done with macro assistance by searching for /later/, deleting license text,
adding appropriate SPDX-License-Identifier and manual post-review.

Devices without a license indicated where assumed GPL-2.0-only according
with the project's license.

Signed-off-by: Ahmad Fatoum <a.fatoum@pengutronix.de>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

clk: mux: Support CLK_SET_RATE_NO_REPARENT flag ...

Since barebox doesn't do reparenting on rate changes we only have
to define the flag.

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

clk: mux: Support mux specific flags ...

We'll need mux specific flags in the future, so add a parameter to
the mux initialization functions.

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

clk: divider: Support CLK_DIVIDER_READ_ONLY flag ...

To support a readonly divider add the CLK_DIVIDER_READ_ONLY flag.

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

clk: divider: pass divider flags ...

The generic clk divider needs clock flags and divider flags. Fix
prototypes to take both as separate arguments.

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

clk: Make CLK_IGNORE_UNUSED generic ...

barebox will never disable unused clocks, so add CLK_IGNORE_UNUSED as a
no-op flag. With this we can keep the changes to the imported kernel
code smaller.

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

ARM: clk: rk3188: don't set same clk rate twice ...

We found setting a clock rate which has already been set, rk3188 (radxa rock
pro) bails out. This is a quick fix only. Underlying situation not (yet)
investigated: why it is even trying to set it to the same rate again. It
remains to state that some but not all rrpro boards exhibit this behaviour, no
other rk3188 boards have been tested.

Signed-off-by: P. Rachet <perachet7@gmail.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

clk: Add RK3288 clock driver ...

Add clk driver for RK3288 SoC. This driver comes from the Linux kernel.
Based on kernel v4.4

Signed-off-by: Wadim Egorov <w.egorov@phytec.de>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

ARM: Rockchip: Update clk driver from Linux kernel for use with newer DTS ...

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

clk: add rockchip clock gate driver ...

Signed-off-by: Beniamino Galvani <b.galvani@gmail.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>