resource: Let dev_request_mem_region return an error pointer ...

For all users fix or add the error check.

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

clk: move of_clk_get_parent_name() to common clk code ...

Signed-off-by: Antony Pavlov <antonynpavlov@gmail.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

clk: Add Altera SoCFPGA clk support ...

The SoCFPGA currently has all clocks described in the devicetree which
makes common clock support a straight forward task.

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