linux-kernel - Re: [PATCH] pwm: Rename pwm_get_state() to better reflect its semantic

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Date:   Tue, 6 Apr 2021 13:16:31 +0200
From:   Thierry Reding <thierry.reding@...il.com>
To:     Uwe Kleine-König <u.kleine-koenig@...gutronix.de>
Cc:     Lee Jones <lee.jones@...aro.org>, Jonathan Corbet <corbet@....net>,
        Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>,
        Jani Nikula <jani.nikula@...ux.intel.com>,
        Joonas Lahtinen <joonas.lahtinen@...ux.intel.com>,
        Rodrigo Vivi <rodrigo.vivi@...el.com>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        Support Opensource <support.opensource@...semi.com>,
        Dmitry Torokhov <dmitry.torokhov@...il.com>,
        Nicolas Ferre <nicolas.ferre@...rochip.com>,
        Alexandre Belloni <alexandre.belloni@...tlin.com>,
        Ludovic Desroches <ludovic.desroches@...rochip.com>,
        Claudiu Beznea <claudiu.beznea@...rochip.com>,
        Shawn Guo <shawnguo@...nel.org>,
        Sascha Hauer <s.hauer@...gutronix.de>,
        Pengutronix Kernel Team <kernel@...gutronix.de>,
        Fabio Estevam <festevam@...il.com>,
        NXP Linux Team <linux-imx@....com>,
        Heiko Stuebner <heiko@...ech.de>,
        Fabrice Gasnier <fabrice.gasnier@...com>,
        Maxime Coquelin <mcoquelin.stm32@...il.com>,
        Alexandre Torgue <alexandre.torgue@...com>,
        Maxime Ripard <mripard@...nel.org>,
        Chen-Yu Tsai <wens@...e.org>,
        Jernej Skrabec <jernej.skrabec@...l.net>,
        Liam Girdwood <lgirdwood@...il.com>,
        Mark Brown <broonie@...nel.org>,
        Daniel Thompson <daniel.thompson@...aro.org>,
        Jingoo Han <jingoohan1@...il.com>, linux-pwm@...r.kernel.org,
        linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-clk@...r.kernel.org, intel-gfx@...ts.freedesktop.org,
        dri-devel@...ts.freedesktop.org, linux-input@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-rockchip@...ts.infradead.org,
        linux-stm32@...md-mailman.stormreply.com,
        linux-fbdev@...r.kernel.org
Subject: Re: [PATCH] pwm: Rename pwm_get_state() to better reflect its
 semantic

On Tue, Apr 06, 2021 at 09:30:36AM +0200, Uwe Kleine-König wrote:
> Given that lowlevel drivers usually cannot implement exactly what a
> consumer requests with pwm_apply_state() there is some rounding involved.
> 
> pwm_get_state() traditionally returned the setting that was requested most
> recently by the consumer (opposed to what was actually implemented in
> hardware in reply to the last request). To make this semantic obvious
> rename the function.
> 
> Signed-off-by: Uwe Kleine-König <u.kleine-koenig@...gutronix.de>
> ---
>  Documentation/driver-api/pwm.rst           |  6 +++-
>  drivers/clk/clk-pwm.c                      |  2 +-
>  drivers/gpu/drm/i915/display/intel_panel.c |  4 +--
>  drivers/input/misc/da7280.c                |  2 +-
>  drivers/input/misc/pwm-beeper.c            |  2 +-
>  drivers/input/misc/pwm-vibra.c             |  4 +--
>  drivers/pwm/core.c                         |  4 +--
>  drivers/pwm/pwm-atmel-hlcdc.c              |  2 +-
>  drivers/pwm/pwm-atmel.c                    |  2 +-
>  drivers/pwm/pwm-imx27.c                    |  2 +-
>  drivers/pwm/pwm-rockchip.c                 |  2 +-
>  drivers/pwm/pwm-stm32-lp.c                 |  4 +--
>  drivers/pwm/pwm-sun4i.c                    |  2 +-
>  drivers/pwm/sysfs.c                        | 18 ++++++------
>  drivers/regulator/pwm-regulator.c          |  4 +--
>  drivers/video/backlight/pwm_bl.c           | 10 +++----
>  include/linux/pwm.h                        | 34 ++++++++++++++--------
>  17 files changed, 59 insertions(+), 45 deletions(-)

Honestly, I don't think this is worth the churn. If you think people
will easily get confused by this then a better solution might be to more
explicitly document the pwm_get_state() function to say exactly what it
returns. But there's no need to make life difficult for everyone by
renaming this to something as cumbersome as this.

Thierry

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