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

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Message-Id: <R4FK0T.J4M42BU49IZ9@gmail.com>
Date: Wed, 06 Aug 2025 11:17:15 +0200
From: Stefano Manni <stefano.manni@...il.com>
To: linus.walleij@...aro.org, brgl@...ev.pl
Cc: linux-gpio@...r.kernel.org, linux-kernel@...r.kernel.org, Stefano Manni
	<stefano.manni@...techsrl.it>
Subject: Re: [PATCH] gpio: pisosr: read ngpios as U32

Please take v2: 
https://lore.kernel.org/linux-gpio/20250806091531.109861-1-stefano.manni@gmail.com/T/#u

On mar, ago 5 2025 at 16:28:56 +02:00:00, Stefano Manni 
<stefano.manni@...il.com> wrote:
> From: Stefano Manni <stefano.manni@...techsrl.it>
> 
> If of_property_read_u16() is used instead the value read
> is always zero.
> 
> Signed-off-by: Stefano Manni <stefano.manni@...techsrl.it>
> 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;
> +
> +	gpio->chip.ngpio = ngpio;
>  	gpio->spi = spi;
> 
>  	gpio->buffer_size = DIV_ROUND_UP(gpio->chip.ngpio, 8);
> --
> 2.48.1
>