Hi Grant,
On Mon, Dec 12, 2011 at 03:02:05PM -0700, Grant Likely wrote:
> Signed-off-by: Grant Likely <[email protected]>
> ---
> drivers/of/clock.c | 43 +++++++++++++++++++++++++++++++++++++++++++
> include/linux/of_clk.h | 4 ++++
> 2 files changed, 47 insertions(+), 0 deletions(-)
>
> diff --git a/drivers/of/clock.c b/drivers/of/clock.c
> index 6519e96..1c189b4 100644
> --- a/drivers/of/clock.c
> +++ b/drivers/of/clock.c
> @@ -3,6 +3,7 @@
> */
>
> #include <linux/clk.h>
> +#include <linux/clkdev.h>
> #include <linux/err.h>
> #include <linux/errno.h>
> #include <linux/module.h>
> @@ -163,3 +164,45 @@ struct clk *of_clk_get_by_name(struct device_node *np,
> const char *name)
>
> return clk;
> }
> +
> +/**
> + * of_clk_init() - Scan and init clock providers from the DT
> + * @matches: array of compatible values and init functions for providers.
> + *
> + * This function scans the device tree for matching clock providers and
> + * calls their initialization functions
> + */
> +void __init of_clk_init(const struct of_device_id *matches)
> +{
> + struct device_node *np;
> +
> + for_each_matching_node(np, matches) {
> + const struct of_device_id *match = of_match_node(matches, np);
> + of_clk_init_cb_t clk_init_cb = match->data;
> + clk_init_cb(np);
> + }
> +}
> +
> +static struct clk *of_fixed_clk_get(struct of_phandle_args *a, void *data)
> +{
> + return data;
> +}
> +
> +/**
> + * of_fixed_clk_setup() - Setup function for simple fixed rate clock
> + */
> +void __init of_fixed_clk_setup(struct device_node *node)
> +{
> + struct clk *clk;
> + u32 rate;
> +
> + if (of_property_read_u32(node, "clock-frequency", &rate))
> + return;
> +
> + clk = kzalloc(sizeof(*clk), GFP_KERNEL);
> + if (!clk)
> + return;
> + clk->rate = rate;
> +
> + of_clk_add_provider(node, of_fixed_clk_get, clk);
> +}
Just take the fixed clk as example, I have a node below as a blob,
which has 3 fixed clks encoded.
ref_clk: ref {
compatible = "fixed-clock", "basic-clock";
#clock-cells = <1>;
clock-frequency = <24000000 32768 0>;
clock-output-name = "osc",
"ckil",
"ckih";
};
If this is valid, the of_fixed_clk_setup() should scan the node for
multiple clks, right?
--
Regards,
Shawn
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