linux-kernel - Re: [PATCH v2] gpio: pisosr: read ngpios as U32

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Message-ID: <CAMRc=MdfjuSSsD=LWDpUroyf+fxC7jQrJDtZJtmj_YiQYQjAuw@mail.gmail.com>
Date: Mon, 11 Aug 2025 09:56:51 +0200
From: Bartosz Golaszewski <brgl@...ev.pl>
To: Stefano Manni <stefano.manni@...il.com>
Cc: linus.walleij@...aro.org, linux-gpio@...r.kernel.org, 
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] gpio: pisosr: read ngpios as U32

On Wed, Aug 6, 2025 at 9:17 AM Stefano Manni <stefano.manni@...il.com> wrote:
>
> If of_property_read_u16() is used instead the value read
> is always zero.
>

Please state more clearly what the problem is. This sentence is quite garbled,

> Signed-off-by: Stefano Manni <stefano.manni@...il.com>
> ---
>  drivers/gpio/gpio-pisosr.c | 6 +++++-
>  1 file changed, 5 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/gpio/gpio-pisosr.c b/drivers/gpio/gpio-pisosr.c
> index a69b74866a13..2dc1b1e021d2 100644
> --- a/drivers/gpio/gpio-pisosr.c
> +++ b/drivers/gpio/gpio-pisosr.c
> @@ -117,6 +117,7 @@ static int pisosr_gpio_probe(struct spi_device *spi)
>  {
>         struct device *dev = &spi->dev;
>         struct pisosr_gpio *gpio;
> +       unsigned int ngpio;
>         int ret;
>
>         gpio = devm_kzalloc(dev, sizeof(*gpio), GFP_KERNEL);
> @@ -125,8 +126,11 @@ static int pisosr_gpio_probe(struct spi_device *spi)
>
>         gpio->chip = template_chip;
>         gpio->chip.parent = dev;
> -       of_property_read_u16(dev->of_node, "ngpios", &gpio->chip.ngpio);
>
> +       if (of_property_read_u32(dev->of_node, "ngpios", &ngpio))
> +               ngpio = DEFAULT_NGPIO;
> +

If you're touching this, can you switch to using generic device
properties instead?

Bart

> +       gpio->chip.ngpio = ngpio;
>         gpio->spi = spi;
>
>         gpio->buffer_size = DIV_ROUND_UP(gpio->chip.ngpio, 8);
> --
> 2.48.1
>