linux-kernel - Re: [PATCH v3 00/15] gpiolib: add gpiod_multi_set_value

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Message-ID: <20250217132152.29d86d6c@jic23-huawei>
Date: Mon, 17 Feb 2025 13:21:52 +0000
From: Jonathan Cameron <jic23@...nel.org>
To: David Lechner <dlechner@...libre.com>
Cc: Linus Walleij <linus.walleij@...aro.org>, Bartosz Golaszewski
 <brgl@...ev.pl>, Andy Shevchenko <andy@...nel.org>, Geert Uytterhoeven
 <geert@...ux-m68k.org>, Lars-Peter Clausen <lars@...afoo.de>, Michael
 Hennerich <Michael.Hennerich@...log.com>, Ulf Hansson
 <ulf.hansson@...aro.org>, Peter Rosin <peda@...ntia.se>, Andrew Lunn
 <andrew@...n.ch>, Heiner Kallweit <hkallweit1@...il.com>, Russell King
 <linux@...linux.org.uk>, "David S. Miller" <davem@...emloft.net>, Eric
 Dumazet <edumazet@...gle.com>, Jakub Kicinski <kuba@...nel.org>, Paolo
 Abeni <pabeni@...hat.com>, Vinod Koul <vkoul@...nel.org>, Kishon Vijay
 Abraham I <kishon@...nel.org>, Nuno Sá <nuno.sa@...log.com>,
 Liam Girdwood <lgirdwood@...il.com>, Mark Brown <broonie@...nel.org>,
 Jaroslav Kysela <perex@...ex.cz>, Takashi Iwai <tiwai@...e.com>,
 linux-gpio@...r.kernel.org, linux-kernel@...r.kernel.org,
 linux-iio@...r.kernel.org, linux-mmc@...r.kernel.org,
 netdev@...r.kernel.org, linux-phy@...ts.infradead.org,
 linux-sound@...r.kernel.org, Andy Shevchenko <andy.shevchenko@...il.com>,
 Jonathan Cameron <Jonathan.Cameron@...wei.com>
Subject: Re: [PATCH v3 00/15] gpiolib: add gpiod_multi_set_value_cansleep

On Mon, 10 Feb 2025 16:33:26 -0600
David Lechner <dlechner@...libre.com> wrote:

> This series was inspired by some minor annoyance I have experienced a
> few times in recent reviews.
> 
> Calling gpiod_set_array_value_cansleep() can be quite verbose due to
> having so many parameters. In most cases, we already have a struct
> gpio_descs that contains the first 3 parameters so we end up with 3 (or
> often even 6) pointer indirections at each call site. Also, people have
> a tendency to want to hard-code the first argument instead of using
> struct gpio_descs.ndescs, often without checking that ndescs >= the
> hard-coded value.
> 
> So I'm proposing that we add a gpiod_multi_set_value_cansleep()
> function that is a wrapper around gpiod_set_array_value_cansleep()
> that has struct gpio_descs as the first parameter to make it a bit
> easier to read the code and avoid the hard-coding temptation.
> 
> I've just done gpiod_multi_set_value_cansleep() for now since there
> were over 10 callers of this one. There aren't as many callers of
> the get and atomic variants, but we can add those too if this seems
> like a useful thing to do.
> 
> Maintainers, if you prefer to have this go through the gpio tree, please
> give your Acked-by:. Several maintainers have also requested an
> immutable branch, so I expect that will be made available. And if there
> is anything leftover after the next kernel release, I will resend it.
I've applied 7-10 to the IIO tree after merging the immutable tag with patch 1.

Jonathan

> 
> ---
> Changes in v3:
> - Added IS_ERR_OR_NULL() check to gpiod_multi_set_value_cansleep()
> - Added new patches to clean up accessing bitmap directly (ts-nbus, ad2s1210).
> - Added function prefix for max3191x.
> - Removed unnecessary braces in ad7606 patch.
> - Picked up additional trailers.
> - Link to v2: https://lore.kernel.org/r/20250206-gpio-set-array-helper-v2-0-1c5f048f79c3@baylibre.com
> 
> Changes in v2:
> - Renamed new function from gpiods_multi_set_value_cansleep() to
>   gpiod_multi_set_value_cansleep()
> - Fixed typo in name of replaced function in all commit messages.
> - Picked up trailers.
> - Link to v1: https://lore.kernel.org/r/20250131-gpio-set-array-helper-v1-0-991c8ccb4d6e@baylibre.com
> 
> ---
> David Lechner (15):
>       gpiolib: add gpiod_multi_set_value_cansleep()
>       auxdisplay: seg-led-gpio: use gpiod_multi_set_value_cansleep
>       bus: ts-nbus: validate ts,data-gpios array size
>       bus: ts-nbus: use gpiod_multi_set_value_cansleep
>       bus: ts-nbus: use bitmap_get_value8()
>       gpio: max3191x: use gpiod_multi_set_value_cansleep
>       iio: adc: ad7606: use gpiod_multi_set_value_cansleep
>       iio: amplifiers: hmc425a: use gpiod_multi_set_value_cansleep
>       iio: resolver: ad2s1210: use gpiod_multi_set_value_cansleep
>       iio: resolver: ad2s1210: use bitmap_write
>       mmc: pwrseq_simple: use gpiod_multi_set_value_cansleep
>       mux: gpio: use gpiod_multi_set_value_cansleep
>       net: mdio: mux-gpio: use gpiod_multi_set_value_cansleep
>       phy: mapphone-mdm6600: use gpiod_multi_set_value_cansleep
>       ASoC: adau1701: use gpiod_multi_set_value_cansleep
> 
>  drivers/auxdisplay/seg-led-gpio.c           |  3 +--
>  drivers/bus/ts-nbus.c                       | 15 +++++++++------
>  drivers/gpio/gpio-max3191x.c                | 18 +++++++-----------
>  drivers/iio/adc/ad7606.c                    |  3 +--
>  drivers/iio/adc/ad7606_spi.c                |  7 +++----
>  drivers/iio/amplifiers/hmc425a.c            |  3 +--
>  drivers/iio/resolver/ad2s1210.c             | 13 +++++--------
>  drivers/mmc/core/pwrseq_simple.c            |  3 +--
>  drivers/mux/gpio.c                          |  4 +---
>  drivers/net/mdio/mdio-mux-gpio.c            |  3 +--
>  drivers/phy/motorola/phy-mapphone-mdm6600.c |  4 +---
>  include/linux/gpio/consumer.h               | 11 +++++++++++
>  sound/soc/codecs/adau1701.c                 |  4 +---
>  13 files changed, 43 insertions(+), 48 deletions(-)
> ---
> base-commit: df4b2bbff898227db0c14264ac7edd634e79f755
> change-id: 20250131-gpio-set-array-helper-bd4a328370d3
> 
> Best regards,