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: socfpga: fix compiler warnings for Cyclone5 ...

When building for Cyclone5 SoCFPGA, the socfpga_a10_pll_init(),
socfpga_a10_perith_init() and socfpga_a10_gate_init() functions are
defined as dummy functions returning ERR_PTR(-ENOSYS).  They are defined
with external linkage.  With '-Wmissing-prototypes' GCC warns about
externally linked function definitions with no preceding prototype.
Define them as 'static inline' to avoid the compiler warnings.

(Note: Arria10 uses non-dummy versions of these functions declared
'extern' but defined elsewhere.)

Signed-off-by: Ian Abbott <abbotti@mev.co.uk>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

clk: socfpga: add arria10 clk drivers ...

Arria10 has a (slightly) different clock controller than the
Cyclone5. Add new drivers for it.

This driver only reads out the setup and builds the clocktree,
it does not setup any clocks.

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

clk: socfpga: move driver to subdirectory ...

Prepare for Arria10 clock driver.

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