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Subject: Re: [PATCH v8 07/21] clk: Add API to get index of the clock parent
To:     Sowjanya Komatineni <skomatineni@nvidia.com>,
        thierry.reding@gmail.com, jonathanh@nvidia.com, tglx@linutronix.de,
        jason@lakedaemon.net, marc.zyngier@arm.com,
        linus.walleij@linaro.org, stefan@agner.ch, mark.rutland@arm.com
Cc:     pdeschrijver@nvidia.com, pgaikwad@nvidia.com, sboyd@kernel.org,
        linux-clk@vger.kernel.org, linux-gpio@vger.kernel.org,
        jckuo@nvidia.com, josephl@nvidia.com, talho@nvidia.com,
        linux-tegra@vger.kernel.org, linux-kernel@vger.kernel.org,
        mperttunen@nvidia.com, spatra@nvidia.com, robh+dt@kernel.org,
        devicetree@vger.kernel.org, rjw@rjwysocki.net,
        viresh.kumar@linaro.org, linux-pm@vger.kernel.org
References: <1565308020-31952-1-git-send-email-skomatineni@nvidia.com>
 <1565308020-31952-8-git-send-email-skomatineni@nvidia.com>
From:   Dmitry Osipenko <digetx@gmail.com>
Message-ID: <311faac9-1dcc-19ee-4662-017d8d9c5918@gmail.com>
Date:   Fri, 9 Aug 2019 14:49:24 +0300
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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@nvidia.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@gmail.com>