clk: at91: modify PMC peripheral clock to deal with newer register layout
As some more information is added to the PCR register, we'd better use a copy of its content and modify just the peripheral-related bits. Implement a read-modify-write for the enable() and disable() callbacks. Signed-off-by: NNicolas Ferre <nicolas.ferre@atmel.com> Signed-off-by: NBoris Brezillon <boris.brezillon@free-electrons.com> Signed-off-by: NStephen Boyd <sboyd@codeaurora.org>
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