ARM: imx: add common clock support for fixup mux

One register may have several fields to control some clocks. It
is possible that the read/write values of some fields may map to
different real functional values, so writing to the other fields
in the same register may break a working clock tree. A real case
is the aclk_podf field in the register 'CCM Serial Clock Multiplexer
Register 1' of i.MX6Q/SDL SoC. This patch introduces a fixup hook
for multiplexer clock which is called before writing a value to
clock registers to support this kind of multiplexer clocks.

Signed-off-by: Liu Ying <Ying.Liu@freescale.com>
Signed-off-by: Shawn Guo <shawn.guo@linaro.org>

1 files changed, 4 insertions, 0 deletions

diff --git a/arch/arm/mach-imx/clk.h b/arch/arm/mach-imx/clk.h
index 51eb38538cc4..2534359fdedc 100644
--- a/arch/arm/mach-imx/clk.h
+++ b/arch/arm/mach-imx/clk.h
@@ -53,6 +53,10 @@ struct clk *imx_clk_fixup_divider(const char *name, const char *parent,
                                   void __iomem *reg, u8 shift, u8 width,
                                   void (*fixup)(u32 *val));
 
+struct clk *imx_clk_fixup_mux(const char *name, void __iomem *reg,
+                              u8 shift, u8 width, const char **parents,
+                              int num_parents, void (*fixup)(u32 *val));
+
 static inline struct clk *imx_clk_fixed(const char *name, int rate)
 {
         return clk_register_fixed_rate(NULL, name, NULL, CLK_IS_ROOT, rate);