linux-kernel - Re: [PATCH 4/6] OPP: Add dev_pm_opp_find_freq_exact

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Message-ID: <20230724062405.GJ2370@thinkpad>
Date:   Mon, 24 Jul 2023 11:54:05 +0530
From:   Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
To:     Viresh Kumar <viresh.kumar@...aro.org>
Cc:     Viresh Kumar <vireshk@...nel.org>, Nishanth Menon <nm@...com>,
        Stephen Boyd <sboyd@...nel.org>,
        "Rafael J. Wysocki" <rafael@...nel.org>, linux-pm@...r.kernel.org,
        Vincent Guittot <vincent.guittot@...aro.org>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 4/6] OPP: Add dev_pm_opp_find_freq_exact_indexed()

On Fri, Jul 21, 2023 at 03:10:57PM +0530, Viresh Kumar wrote:
> The indexed version of the API is added for other floor and ceil, add
> the same for exact as well for completeness.
> 

Well, "completeness" makes sense to me but I always heard that you should add
an API when there is a user. That was the reason I didn't add it in my patch.

- Mani

> Signed-off-by: Viresh Kumar <viresh.kumar@...aro.org>
> ---
>  drivers/opp/core.c     | 28 ++++++++++++++++++++++++++++
>  include/linux/pm_opp.h | 11 +++++++++++
>  2 files changed, 39 insertions(+)
> 
> diff --git a/drivers/opp/core.c b/drivers/opp/core.c
> index 00638d40353f..7b1d5724b3d8 100644
> --- a/drivers/opp/core.c
> +++ b/drivers/opp/core.c
> @@ -648,6 +648,34 @@ struct dev_pm_opp *dev_pm_opp_find_freq_exact(struct device *dev,
>  }
>  EXPORT_SYMBOL_GPL(dev_pm_opp_find_freq_exact);
>  
> +/**
> + * dev_pm_opp_find_freq_exact_indexed() - Search for an exact freq for the
> + *					 clock corresponding to the index
> + * @dev:	Device for which we do this operation
> + * @freq:	frequency to search for
> + * @index:	Clock index
> + * @available:	true/false - match for available opp
> + *
> + * Search for the matching exact OPP for the clock corresponding to the
> + * specified index from a starting freq for a device.
> + *
> + * Return: matching *opp , else returns ERR_PTR in case of error and should be
> + * handled using IS_ERR. Error return values can be:
> + * EINVAL:	for bad pointer
> + * ERANGE:	no match found for search
> + * ENODEV:	if device not found in list of registered devices
> + *
> + * The callers are required to call dev_pm_opp_put() for the returned OPP after
> + * use.
> + */
> +struct dev_pm_opp *
> +dev_pm_opp_find_freq_exact_indexed(struct device *dev, unsigned long freq,
> +				   u32 index, bool available)
> +{
> +	return _find_key_exact(dev, freq, index, available, _read_freq, NULL);
> +}
> +EXPORT_SYMBOL_GPL(dev_pm_opp_find_freq_exact_indexed);
> +
>  static noinline struct dev_pm_opp *_find_freq_ceil(struct opp_table *opp_table,
>  						   unsigned long *freq)
>  {
> diff --git a/include/linux/pm_opp.h b/include/linux/pm_opp.h
> index a13a1705df57..23e4e4eaaa42 100644
> --- a/include/linux/pm_opp.h
> +++ b/include/linux/pm_opp.h
> @@ -124,6 +124,10 @@ struct dev_pm_opp *dev_pm_opp_find_freq_exact(struct device *dev,
>  					      unsigned long freq,
>  					      bool available);
>  
> +struct dev_pm_opp *
> +dev_pm_opp_find_freq_exact_indexed(struct device *dev, unsigned long freq,
> +				   u32 index, bool available);
> +
>  struct dev_pm_opp *dev_pm_opp_find_freq_floor(struct device *dev,
>  					      unsigned long *freq);
>  
> @@ -268,6 +272,13 @@ static inline struct dev_pm_opp *dev_pm_opp_find_freq_exact(struct device *dev,
>  	return ERR_PTR(-EOPNOTSUPP);
>  }
>  
> +static inline struct dev_pm_opp *
> +dev_pm_opp_find_freq_exact_indexed(struct device *dev, unsigned long freq,
> +				   u32 index, bool available)
> +{
> +	return ERR_PTR(-EOPNOTSUPP);
> +}
> +
>  static inline struct dev_pm_opp *dev_pm_opp_find_freq_floor(struct device *dev,
>  					unsigned long *freq)
>  {
> -- 
> 2.31.1.272.g89b43f80a514
> 

-- 
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