Hi Stephen,
Pretty good idea, but I have some comments inline.
On Wednesday 24 of July 2013 17:43:30 Stephen Boyd wrote:
> Consolidate DT parsing for the common bits of a clock binding in
> one place to simplify clock drivers. This also has the added
> benefit of standardizing how the clock names used by the common
> clock framework are generated from the DT bindings. We always use
> the first clock-output-names string if it exists, otherwise we
> fall back to the node name.
>
> To be slightly more efficient and make the caller's life easier,
> we introduce a shallow copy flag so that the clock core knows to
> just copy the pointers to the strings and not the string
> contents. Otherwise the callers of this function would have to
> free the strings allocated here which could be cumbersome.
>
> Cc: Rob Herring <rob.herring@xxxxxxxxxxx>
> Signed-off-by: Stephen Boyd <sboyd@xxxxxxxxxxxxxx>
> ---
> drivers/clk/clk.c | 59
> +++++++++++++++++++++++++++++++++++++++++++-
> include/linux/clk-provider.h | 7 ++++++
> 2 files changed, 65 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/clk/clk.c b/drivers/clk/clk.c
> index 1ed9bdd..ea8e951b 100644
> --- a/drivers/clk/clk.c
> +++ b/drivers/clk/clk.c
> @@ -1809,6 +1809,10 @@ static int _clk_register(struct device *dev,
> struct clk_hw *hw, struct clk *clk) {
> int i, ret;
>
> + hw->clk = clk;
> + if (hw->init->flags & CLK_SHALLOW_COPY)
> + return PTR_RET(__clk_register(dev, hw));
> +
> clk->name = kstrdup(hw->init->name, GFP_KERNEL);
> if (!clk->name) {
> pr_err("%s: could not allocate clk->name\n", __func__);
> @@ -1819,7 +1823,6 @@ static int _clk_register(struct device *dev,
> struct clk_hw *hw, struct clk *clk) clk->hw = hw;
> clk->flags = hw->init->flags;
> clk->num_parents = hw->init->num_parents;
> - hw->clk = clk;
>
> /* allocate local copy in case parent_names is __initdata */
> clk->parent_names = kzalloc((sizeof(char*) * clk->num_parents),
> @@ -2232,4 +2235,58 @@ void __init of_clk_init(const struct of_device_id
> *matches) clk_init_cb(np);
> }
> }
> +
> +/**
> + * of_init_clk_data() - Initialize a clk_init_data struct from a DT
> node + * @np: node to initialize struct from
> + * @init: struct to initialize
> + *
> + * Populates the clk_init_data struct by parsing the device node for
> + * properties matching the common clock binding. Returns 0 on success
> + * and a negative error code on failure.
> + */
> +int of_init_clk_data(struct device_node *np, struct clk_init_data
> *init) +{
> + struct of_phandle_args s;
> + const char **names = NULL, **p;
> + const char *name;
> + int i;
> +
> + if (of_property_read_string(np, "clock-output-names", &name) < 0)
> + name = np->name;
> + init->name = kstrdup(name, GFP_KERNEL);
> + if (!init->name)
> + return -ENOMEM;
> +
> + for (i = 0; of_parse_phandle_with_args(np, "clocks", "#clock-
cells",
> + i, &s) == 0; i++) {
> + p = krealloc(names, sizeof(*names) * (i + 1), GFP_KERNEL);
> + if (!p)
> + goto err;
What about using of_count_phandle_with_args() first to get the parent
count?
> + names = p;
> +
> + if (of_property_read_string(s.np, "clock-output-names",
> + &name) < 0)
> + name = s.np->name;
You should be able to use of_clk_get_parent_name() here, instead of
parsing the properties directly.
Best regards,
Tomasz
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