linux-kernel - Re: [PATCH v1 0/5] gpio: regmap: Make use of 'ngpios' property

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Message-Id: <D7S21NAXRW2A.2LB56QSTDCV6Z@bootlin.com>
Date: Fri, 14 Feb 2025 10:18:29 +0100
From: "Mathieu Dubois-Briand" <mathieu.dubois-briand@...tlin.com>
To: "Andy Shevchenko" <andriy.shevchenko@...ux.intel.com>, "Bartosz
 Golaszewski" <bartosz.golaszewski@...aro.org>,
 <linux-gpio@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Cc: "Michael Walle" <mwalle@...nel.org>, "Linus Walleij"
 <linus.walleij@...aro.org>, "Bartosz Golaszewski" <brgl@...ev.pl>
Subject: Re: [PATCH v1 0/5] gpio: regmap: Make use of 'ngpios' property

On Thu Feb 13, 2025 at 8:48 PM CET, Andy Shevchenko wrote:
> It appears that regmap GPIO doesn't take into account 'ngpios' property
> and requires hard coded values or duplication of the parsing the same
> outside of GPIO library. This miniseries addresses that.
>
> For the record, I have checked all bgpio_init() users and haven't seen
> the suspicious code that this series might break, e.g., an equivalent of
> something like this:
>
> static int foo_probe(struct device *dev)
> {
> 	struct gpio_chip *gc = devm_kzalloc(...);
> 	struct fwnode_handle *fwnode = ...; // NOT dev_fwnode(dev)!
>
> 	...
> 	gc->parent = dev;
> 	gc->fwnode = fwnode;
>
> 	ret = bgpio_init(gc, dev, ...);
> 	...
> }
>
> Reported-by: Mathieu Dubois-Briand <mathieu.dubois-briand@...tlin.com>
>
> Andy Shevchenko (5):
>   gpiolib: Extract gpiochip_choose_fwnode() for wider use
>   gpiolib: Use fwnode instead of device in gpiochip_get_ngpios()
>   gpio: regmap: Group optional assignments together for better
>     understanding
>   gpio: regmap: Move optional assignments down in the code
>   gpio: regmap: Allow ngpio to be read from the property
>
>  drivers/gpio/gpio-regmap.c  | 41 +++++++++++++++++++++----------------
>  drivers/gpio/gpiolib.c      | 27 ++++++++++++++++--------
>  include/linux/gpio/regmap.h |  4 ++--
>  3 files changed, 43 insertions(+), 29 deletions(-)

Hi Andy,

Thanks, I confirm I tested this series and it does fix my case: I can
leave the ngpio field uninitialized and its value will be correctly
retrieved from the "ngpios" property.

Also the whole series looks good to me.

-- 
Mathieu Dubois-Briand, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com