linux-kernel - Re: [PATCH v2 1/3] PM / clock_ops: Add pm_clk_add

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Message-ID: <20141022173856.GB28104@dtor-ws>
Date:	Wed, 22 Oct 2014 10:38:56 -0700
From:	Dmitry Torokhov <dmitry.torokhov@...il.com>
To:	Grygorii Strashko <grygorii.strashko@...com>
Cc:	ssantosh@...nel.org, "Rafael J. Wysocki" <rjw@...ysocki.net>,
	khilman@...aro.org, Geert Uytterhoeven <geert+renesas@...der.be>,
	linux-pm@...r.kernel.org, Rob Herring <robh+dt@...nel.org>,
	grant.likely@...retlab.ca, ulf.hansson@...aro.org,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	devicetree@...r.kernel.org
Subject: Re: [PATCH v2 1/3] PM / clock_ops: Add pm_clk_add_clk()

On Mon, Oct 20, 2014 at 03:56:02PM +0300, Grygorii Strashko wrote:
> From: Geert Uytterhoeven <geert+renesas@...der.be>
> 
> The existing pm_clk_add() allows to pass a clock by con_id. However,
> when referring to a specific clock from DT, no con_id is available.
> 
> Add pm_clk_add_clk(), which allows to specify the struct clk * directly.
> 
> Reviewed-by: Kevin Hilman <khilman@...aro.org>
> Signed-off-by: Geert Uytterhoeven <geert+renesas@...der.be>
> Signed-off-by: Grygorii Strashko <grygorii.strashko@...com>
> ---
> 
>  Pay attantion pls, that there is another series of patches
>  which have been posted already and which depends from this patch
>    "[PATCH v4 0/3] ARM: rk3288 : Add PM Domain support"
>    https://lkml.org/lkml/2014/10/20/105
> 
>  drivers/base/power/clock_ops.c | 41 +++++++++++++++++++++++++++++++----------
>  include/linux/pm_clock.h       |  8 ++++++++
>  2 files changed, 39 insertions(+), 10 deletions(-)
> 
> diff --git a/drivers/base/power/clock_ops.c b/drivers/base/power/clock_ops.c
> index 7836930..f14b767 100644
> --- a/drivers/base/power/clock_ops.c
> +++ b/drivers/base/power/clock_ops.c
> @@ -53,7 +53,8 @@ static inline int __pm_clk_enable(struct device *dev, struct clk *clk)
>   */
>  static void pm_clk_acquire(struct device *dev, struct pm_clock_entry *ce)
>  {
> -	ce->clk = clk_get(dev, ce->con_id);
> +	if (!ce->clk)
> +		ce->clk = clk_get(dev, ce->con_id);
>  	if (IS_ERR(ce->clk)) {
>  		ce->status = PCE_STATUS_ERROR;
>  	} else {
> @@ -63,15 +64,8 @@ static void pm_clk_acquire(struct device *dev, struct pm_clock_entry *ce)
>  	}
>  }
>  
> -/**
> - * pm_clk_add - Start using a device clock for power management.
> - * @dev: Device whose clock is going to be used for power management.
> - * @con_id: Connection ID of the clock.
> - *
> - * Add the clock represented by @con_id to the list of clocks used for
> - * the power management of @dev.
> - */
> -int pm_clk_add(struct device *dev, const char *con_id)
> +static int __pm_clk_add(struct device *dev, const char *con_id,
> +			struct clk *clk)
>  {
>  	struct pm_subsys_data *psd = dev_to_psd(dev);
>  	struct pm_clock_entry *ce;
> @@ -93,6 +87,8 @@ int pm_clk_add(struct device *dev, const char *con_id)
>  			kfree(ce);
>  			return -ENOMEM;
>  		}
> +	} else {
> +		ce->clk = clk;
>  	}
>  
>  	pm_clk_acquire(dev, ce);
> @@ -104,6 +100,31 @@ int pm_clk_add(struct device *dev, const char *con_id)
>  }
>  
>  /**
> + * pm_clk_add - Start using a device clock for power management.
> + * @dev: Device whose clock is going to be used for power management.
> + * @con_id: Connection ID of the clock.
> + *
> + * Add the clock represented by @con_id to the list of clocks used for
> + * the power management of @dev.
> + */
> +int pm_clk_add(struct device *dev, const char *con_id)
> +{
> +	return __pm_clk_add(dev, con_id, NULL);

Bikeshedding: why do we need __pm_clk_add() and not simply have
"canonical" pm_clk_add_clk() and then do:

int pm_clk_add(struct device *dev, const char *con_id)
{
	struct clk *clk;

	clk = clk_get(dev, con_id);
	...
	return pm_clk_add_clk(dev, clk);
}

Thanks.

-- 
Dmitry
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