linux-kernel - Re: [PATCH v10 2/9] OPP: Add support for parsing the 'opp-level' property

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Message-ID: <20190109091210.jw6gw5qif55p7wes@vireshk-i7>
Date:   Wed, 9 Jan 2019 14:42:10 +0530
From:   Viresh Kumar <viresh.kumar@...aro.org>
To:     Rajendra Nayak <rnayak@...eaurora.org>
Cc:     andy.gross@...aro.org, robh@...nel.org, sboyd@...nel.org,
        ulf.hansson@...aro.org, collinsd@...eaurora.org, mka@...omium.org,
        devicetree@...r.kernel.org, linux-arm-msm@...r.kernel.org,
        linux-kernel@...r.kernel.org, henryc.chen@...iatek.com
Subject: Re: [PATCH v10 2/9] OPP: Add support for parsing the 'opp-level'
 property

On 09-01-19, 14:34, Rajendra Nayak wrote:
> Now that the OPP bindings are updated to include an optional
> 'opp-level' property, add support to parse it from device tree
> and store it as part of dev_pm_opp structure.
> Also add and export an helper 'dev_pm_opp_get_level()' that can be
> used to get the level value read from device tree when present.
> 
> Signed-off-by: Rajendra Nayak <rnayak@...eaurora.org>
> ---
>  drivers/opp/core.c     | 18 ++++++++++++++++++
>  drivers/opp/of.c       |  5 ++++-
>  drivers/opp/opp.h      |  2 ++
>  include/linux/pm_opp.h |  7 +++++++
>  4 files changed, 31 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/opp/core.c b/drivers/opp/core.c
> index e5507add8f04..738b1783aa65 100644
> --- a/drivers/opp/core.c
> +++ b/drivers/opp/core.c
> @@ -130,6 +130,24 @@ unsigned long dev_pm_opp_get_freq(struct dev_pm_opp *opp)
>  }
>  EXPORT_SYMBOL_GPL(dev_pm_opp_get_freq);
>  
> +/**
> + * dev_pm_opp_get_level() - Gets the level corresponding to an available opp
> + * @opp:	opp for which level value has to be returned for
> + *
> + * Return: level read from device tree corresponding to the opp, else
> + * return 0

All a full-stop here.

> + */
> +unsigned int dev_pm_opp_get_level(struct dev_pm_opp *opp)
> +{
> +	if (IS_ERR_OR_NULL(opp) || !opp->available) {
> +		pr_err("%s: Invalid parameters\n", __func__);
> +		return 0;
> +	}
> +
> +	return opp->level;
> +}
> +EXPORT_SYMBOL_GPL(dev_pm_opp_get_level);
> +
>  /**
>   * dev_pm_opp_is_turbo() - Returns if opp is turbo OPP or not
>   * @opp: opp for which turbo mode is being verified
> diff --git a/drivers/opp/of.c b/drivers/opp/of.c
> index 06f0f632ec47..8274d3ba2c5b 100644
> --- a/drivers/opp/of.c
> +++ b/drivers/opp/of.c
> @@ -568,7 +568,7 @@ static struct dev_pm_opp *_opp_add_static_v2(struct opp_table *opp_table,
>  {
>  	struct dev_pm_opp *new_opp;
>  	u64 rate = 0;
> -	u32 val;
> +	u32 val, level = 0;
>  	int ret;
>  	bool rate_not_available = false;
>  
> @@ -594,6 +594,9 @@ static struct dev_pm_opp *_opp_add_static_v2(struct opp_table *opp_table,
>  		new_opp->rate = (unsigned long)rate;
>  	}
>  
> +	if (!of_property_read_u32(np, "opp-level", &level))
> +		new_opp->level = level;
> +

What about 

        of_property_read_u32(np, "opp-level", &new_opp->level);

??

>  	/* Check if the OPP supports hardware's hierarchy of versions or not */
>  	if (!_opp_is_supported(dev, opp_table, np)) {
>  		dev_dbg(dev, "OPP not supported by hardware: %llu\n", rate);
> diff --git a/drivers/opp/opp.h b/drivers/opp/opp.h
> index e24d81497375..5accdd96867d 100644
> --- a/drivers/opp/opp.h
> +++ b/drivers/opp/opp.h
> @@ -60,6 +60,7 @@ extern struct list_head opp_tables;
>   * @suspend:	true if suspend OPP
>   * @pstate: Device's power domain's performance state.
>   * @rate:	Frequency in hertz
> + * @level:	level value to be comminucated to remote power manager

Just say "performance level" here. Btw, communicated was also
misspelled here.

>   * @supplies:	Power supplies voltage/current values
>   * @clock_latency_ns: Latency (in nanoseconds) of switching to this OPP's
>   *		frequency from any other OPP's frequency.
> @@ -80,6 +81,7 @@ struct dev_pm_opp {
>  	bool suspend;
>  	unsigned int pstate;
>  	unsigned long rate;
> +	unsigned int level;
>  
>  	struct dev_pm_opp_supply *supplies;
>  
-- 
viresh