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    Subject[PATCH 1/4] clk: core: introduce clk_hw_set_parent()
    Date
    Introduce the clk_hw_set_parent() provider call to change parent of
    a clock by using the clk_hw pointers.

    This eases the clock reparenting from clock rate notifiers and
    implementing DVFS with simpler code avoiding the boilerplates
    functions as __clk_lookup(clk_hw_get_name()) then clk_set_parent().

    Signed-off-by: Neil Armstrong <narmstrong@baylibre.com>
    Acked-by: Martin Blumenstingl <martin.blumenstingl@googlemail.com>
    ---
    drivers/clk/clk.c | 6 ++++++
    include/linux/clk-provider.h | 1 +
    2 files changed, 7 insertions(+)

    diff --git a/drivers/clk/clk.c b/drivers/clk/clk.c
    index c0990703ce54..c11b1781d24a 100644
    --- a/drivers/clk/clk.c
    +++ b/drivers/clk/clk.c
    @@ -2487,6 +2487,12 @@ static int clk_core_set_parent_nolock(struct clk_core *core,
    return ret;
    }

    +int clk_hw_set_parent(struct clk_hw *hw, struct clk_hw *parent)
    +{
    + return clk_core_set_parent_nolock(hw->core, parent->core);
    +}
    +EXPORT_SYMBOL_GPL(clk_hw_set_parent);
    +
    /**
    * clk_set_parent - switch the parent of a mux clk
    * @clk: the mux clk whose input we are switching
    diff --git a/include/linux/clk-provider.h b/include/linux/clk-provider.h
    index 2ae7604783dd..dce5521a9bf6 100644
    --- a/include/linux/clk-provider.h
    +++ b/include/linux/clk-provider.h
    @@ -817,6 +817,7 @@ unsigned int clk_hw_get_num_parents(const struct clk_hw *hw);
    struct clk_hw *clk_hw_get_parent(const struct clk_hw *hw);
    struct clk_hw *clk_hw_get_parent_by_index(const struct clk_hw *hw,
    unsigned int index);
    +int clk_hw_set_parent(struct clk_hw *hw, struct clk_hw *new_parent);
    unsigned int __clk_get_enable_count(struct clk *clk);
    unsigned long clk_hw_get_rate(const struct clk_hw *hw);
    unsigned long __clk_get_flags(struct clk *clk);
    --
    2.22.0
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