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Commit c57acd14 authored by Tomasz Figa's avatar Tomasz Figa Committed by Mike Turquette
Browse files

clk: mux: Add support for read-only muxes. 



Some platforms have read-only clock muxes that are preconfigured at
reset and cannot be changed at runtime. This patch extends mux clock
driver to allow handling such read-only muxes by adding new
CLK_MUX_READ_ONLY mux flag.

Signed-off-by: default avatarTomasz Figa <tomasz.figa@gmail.com>
Signed-off-by: default avatarMike Turquette <mturquette@linaro.org>
parent 3b2f64d0

drivers/clk/clk-mux.c

+9 −1
Original line number Diff line number Diff line
@@ -107,6 +107,11 @@ const struct clk_ops clk_mux_ops = { 
};

EXPORT_SYMBOL_GPL(clk_mux_ops);



const struct clk_ops clk_mux_ro_ops = {

	.get_parent = clk_mux_get_parent,

};

EXPORT_SYMBOL_GPL(clk_mux_ro_ops);



struct clk *clk_register_mux_table(struct device *dev, const char *name,

		const char **parent_names, u8 num_parents, unsigned long flags,

		void __iomem *reg, u8 shift, u32 mask,
@@ -133,6 +138,9 @@ struct clk *clk_register_mux_table(struct device *dev, const char *name, 
	}



	init.name = name;

	if (clk_mux_flags & CLK_MUX_READ_ONLY)

		init.ops = &clk_mux_ro_ops;

	else

		init.ops = &clk_mux_ops;

	init.flags = flags | CLK_IS_BASIC;

	init.parent_names = parent_names;

include/linux/clk-provider.h

+2 −0
Original line number Diff line number Diff line
@@ -327,8 +327,10 @@ struct clk_mux { 
#define CLK_MUX_INDEX_ONE		BIT(0)

#define CLK_MUX_INDEX_BIT		BIT(1)

#define CLK_MUX_HIWORD_MASK		BIT(2)

#define CLK_MUX_READ_ONLY	BIT(3) /* mux setting cannot be changed */



extern const struct clk_ops clk_mux_ops;

extern const struct clk_ops clk_mux_ro_ops;



struct clk *clk_register_mux(struct device *dev, const char *name,

		const char **parent_names, u8 num_parents, unsigned long flags,