linux-kernel - Re: [PATCH v8 07/21] clk: Add API to get index of the clock parent

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Date:   Fri, 9 Aug 2019 14:49:24 +0300
From:   Dmitry Osipenko <digetx@...il.com>
To:     Sowjanya Komatineni <skomatineni@...dia.com>,
        thierry.reding@...il.com, jonathanh@...dia.com, tglx@...utronix.de,
        jason@...edaemon.net, marc.zyngier@....com,
        linus.walleij@...aro.org, stefan@...er.ch, mark.rutland@....com
Cc:     pdeschrijver@...dia.com, pgaikwad@...dia.com, sboyd@...nel.org,
        linux-clk@...r.kernel.org, linux-gpio@...r.kernel.org,
        jckuo@...dia.com, josephl@...dia.com, talho@...dia.com,
        linux-tegra@...r.kernel.org, linux-kernel@...r.kernel.org,
        mperttunen@...dia.com, spatra@...dia.com, robh+dt@...nel.org,
        devicetree@...r.kernel.org, rjw@...ysocki.net,
        viresh.kumar@...aro.org, linux-pm@...r.kernel.org
Subject: Re: [PATCH v8 07/21] clk: Add API to get index of the clock parent

09.08.2019 2:46, Sowjanya Komatineni пишет:
> This patch adds an API clk_hw_get_parent_index to get index of the
> clock parent to use during the clock restore operations on system
> resume.
> 
> Signed-off-by: Sowjanya Komatineni <skomatineni@...dia.com>
> ---
>  drivers/clk/clk.c            | 17 +++++++++++++++++
>  include/linux/clk-provider.h |  1 +
>  2 files changed, 18 insertions(+)
> 
> diff --git a/drivers/clk/clk.c b/drivers/clk/clk.c
> index c0990703ce54..f26252e48f73 100644
> --- a/drivers/clk/clk.c
> +++ b/drivers/clk/clk.c
> @@ -1643,6 +1643,23 @@ static int clk_fetch_parent_index(struct clk_core *core,
>  	return i;
>  }
>  
> +/**
> + * clk_hw_get_parent_index - return the index of parent clock
> + * @hw: clk_hw associated with the clk being consumed
> + * @parent_hw: clk_hw associated with the parent of clk
> + *
> + * Fetches and returns the index of parent clock.
> + * if hw or parent_hw is NULL, returns -EINVAL.
> + */
> +int clk_hw_get_parent_index(struct clk_hw *hw, struct clk_hw *parent_hw)
> +{
> +	if (!hw || !parent_hw)
> +		return -EINVAL;
> +
> +	return clk_fetch_parent_index(hw->core, parent_hw->core);
> +}
> +EXPORT_SYMBOL_GPL(clk_hw_get_parent_index);
> +
>  /*
>   * Update the orphan status of @core and all its children.
>   */
> diff --git a/include/linux/clk-provider.h b/include/linux/clk-provider.h
> index 2ae7604783dd..477112946dd2 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_get_parent_index(struct clk_hw *hw, struct clk_hw *parent_hw);
>  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);
> 

Reviewed-by: Dmitry Osipenko <digetx@...il.com>