linux-kernel - Re: [PATCH v2 1/4] clk: core: introduce clk_hw_set

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Date:   Tue, 06 Aug 2019 10:28:19 +0200
From:   Jerome Brunet <jbrunet@...libre.com>
To:     Neil Armstrong <narmstrong@...libre.com>, sboyd@...nel.org
Cc:     Neil Armstrong <narmstrong@...libre.com>,
        linux-clk@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-amlogic@...ts.infradead.org,
        linux-arm-kernel@...ts.infradead.org,
        Martin Blumenstingl <martin.blumenstingl@...glemail.com>
Subject: Re: [PATCH v2 1/4] clk: core: introduce clk_hw_set_parent()

On Wed 31 Jul 2019 at 10:40, Neil Armstrong <narmstrong@...libre.com> wrote:

> 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@...libre.com>
> Acked-by: Martin Blumenstingl <martin.blumenstingl@...glemail.com>

Looks ok to me but we will obviously need Stephen's ack to apply it

> ---
>  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