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    Subject[RFC v2 5/9] dt/clock: Add handling for fixed clocks and a clock node setup iterator
    Date
    Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
    ---
    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);
    +}
    diff --git a/include/linux/of_clk.h b/include/linux/of_clk.h
    index dcbd27b..02ecc98 100644
    --- a/include/linux/of_clk.h
    +++ b/include/linux/of_clk.h
    @@ -10,6 +10,7 @@ struct clk;
    #ifdef CONFIG_OF_CLOCK

    struct device_node;
    +typedef void (*of_clk_init_cb_t)(struct device_node *);

    int of_clk_add_provider(struct device_node *np,
    struct clk *(*clk_src_get)(struct of_phandle_args *args,
    @@ -21,6 +22,9 @@ void of_clk_del_provider(struct device_node *np);
    struct clk *of_clk_get(struct device_node *np, int index);
    struct clk *of_clk_get_by_name(struct device_node *np, const char *name);

    +void of_clk_init(const struct of_device_id *matches);
    +extern void of_fixed_clk_setup(struct device_node *np);
    +
    #else
    static struct clk *of_clk_get(struct device_node *np, int index)
    {
    --
    1.7.5.4


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