linux-kernel - Re: [PATCH v3 01/12] pwm: introduce default period and polarity concepts

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Date:	Mon, 21 Sep 2015 20:20:29 +0200
From:	Robert Jarzmik <robert.jarzmik@...e.fr>
To:	Boris Brezillon <boris.brezillon@...e-electrons.com>
Cc:	Thierry Reding <thierry.reding@...il.com>,
	linux-pwm@...r.kernel.org, Mark Brown <broonie@...nel.org>,
	Liam Girdwood <lgirdwood@...il.com>,
	Jingoo Han <jingoohan1@...il.com>,
	Lee Jones <lee.jones@...aro.org>, linux-fbdev@...r.kernel.org,
	Bryan Wu <cooloney@...il.com>,
	Richard Purdie <rpurdie@...ys.net>,
	Jacek Anaszewski <j.anaszewski@...sung.com>,
	linux-leds@...r.kernel.org,
	Maxime Ripard <maxime.ripard@...e-electrons.com>,
	linux-sunxi@...glegroups.com, Heiko Stuebner <heiko@...ech.de>,
	linux-rockchip@...ts.infradead.org,
	Jean-Christophe Plagniol-Villard <plagnioj@...osoft.com>,
	Tomi Valkeinen <tomi.valkeinen@...com>,
	Daniel Mack <daniel@...que.org>,
	Haojian Zhuang <haojian.zhuang@...il.com>,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	Doug Anderson <dianders@...gle.com>,
	Uwe Kleine-König 
	<u.kleine-koenig@...gutronix.de>
Subject: Re: [PATCH v3 01/12] pwm: introduce default period and polarity concepts

Boris Brezillon <boris.brezillon@...e-electrons.com> writes:

> When requested by a user, the PWM is assigned a default period and polarity
> extracted from the DT, the platform data or statically set by the driver.
> Those default values are currently stored in the period and polarity
> fields of the pwm_device struct, but they will be stored somewhere else
> once we have introduced the architecture allowing for hardware state
> retrieval.
>
> The pwm_set_default_polarity and pwm_set_default_period should only be
> used by PWM drivers or the PWM core infrastructure to specify the
> default period and polarity values.
>
> PWM users might call the pwm_get_default_period to query the default
> period value. There is currently no helper to query the default
> polarity, but it might be added later on if there is a need for it.
>
> This patch also modifies all the places where the default helpers should
> be used in place of the standard ones.
>
> Signed-off-by: Boris Brezillon <boris.brezillon@...e-electrons.com>
For pwm-pxa.c :
Acked-by: Robert Jarzmik <robert.jarzmik@...e.fr>

Cheers.

--
Robert
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