Quoting Stephen Boyd (2013-07-25 09:36:56)
> On 07/25, Tomasz Figa wrote:
> > 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?
>
> Sure that simplifies things.
I made a simple wrapper around of_count_phandle_with_args for the basic
DT bindings series:
http://lists.infradead.org/pipermail/linux-arm-kernel/2013-June/178836.html
I still need to make a couple of changes to that before I merge it. If
you want to base on top of the v3 version then you can use it, otherwise
just use of_count_phandle_with_args.
Regards,
Mike
>
> >
> > > + 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.
>
> This must be new too. Will do in v2.
>
> --
> Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum,
> hosted by The Linux Foundation
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