Hi Mike,
On Tuesday 23 of July 2013 01:49:18 Tomasz Figa wrote:
> 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: Tomasz Figa <tomasz.figa@xxxxxxxxx>
> ---
> drivers/clk/clk-mux.c | 10 +++++++++-
> include/linux/clk-provider.h | 2 ++
> 2 files changed, 11 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/clk/clk-mux.c b/drivers/clk/clk-mux.c
> index 614444c..92f1a1b 100644
> --- a/drivers/clk/clk-mux.c
> +++ b/drivers/clk/clk-mux.c
> @@ -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,
> @@ -133,7 +138,10 @@ struct clk *clk_register_mux_table(struct device
> *dev, const char *name, }
>
> init.name = name;
> - init.ops = &clk_mux_ops;
> + 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;
> init.num_parents = num_parents;
> diff --git a/include/linux/clk-provider.h b/include/linux/clk-provider.h
> index 1ec14a7..9487b96 100644
> --- a/include/linux/clk-provider.h
> +++ b/include/linux/clk-provider.h
> @@ -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,
What do you think about this?
Best regards,
Tomasz
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