linux-kernel - Re: [PATCH] gpio: vf610: add get

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Message-ID: <8ebb5430-93fa-4239-b09a-59f35b0dd94d@gmx.net>
Date: Mon, 22 Jul 2024 12:32:15 +0200
From: Stefan Wahren <wahrenst@....net>
To: haibo.chen@....com, linus.walleij@...aro.org, brgl@...ev.pl
Cc: linux-gpio@...r.kernel.org, linux-kernel@...r.kernel.org,
 imx@...ts.linux.dev
Subject: Re: [PATCH] gpio: vf610: add get_direction() support

Hi Haibo,

Am 22.07.24 um 08:28 schrieb haibo.chen@....com:
> From: Haibo Chen <haibo.chen@....com>
>
> For IP which do not contain PDDR, currently use the pinmux API
> pinctrl_gpio_direction_input() to config the output/input, pinmux
> currently do not support get_direction(). So here add the GPIO
> get_direction() support only for the IP which has Port Data
> Direction Register (PDDR).
>
> Signed-off-by: Haibo Chen <haibo.chen@....com>
> ---
>   drivers/gpio/gpio-vf610.c | 19 +++++++++++++++++++
>   1 file changed, 19 insertions(+)
>
> diff --git a/drivers/gpio/gpio-vf610.c b/drivers/gpio/gpio-vf610.c
> index 07e5e6323e86..08ca8377b19c 100644
> --- a/drivers/gpio/gpio-vf610.c
> +++ b/drivers/gpio/gpio-vf610.c
> @@ -151,6 +151,19 @@ static int vf610_gpio_direction_output(struct gpio_chip *chip, unsigned gpio,
>   	return pinctrl_gpio_direction_output(chip, gpio);
>   }
>
> +static int vf610_gpio_get_direction(struct gpio_chip *gc, unsigned int gpio)
> +{
> +	struct vf610_gpio_port *port = gpiochip_get_data(gc);
> +	unsigned long mask = BIT(gpio);
thanks for sending this patch. I'm fine with this patch, but could we
use u32 to make it clear about the range of the mask?

Regards
> +
> +	mask &= vf610_gpio_readl(port->gpio_base + GPIO_PDDR);
> +
> +	if (mask)
> +		return GPIO_LINE_DIRECTION_OUT;
> +
> +	return GPIO_LINE_DIRECTION_IN;
> +}
> +
>   static void vf610_gpio_irq_handler(struct irq_desc *desc)
>   {
>   	struct vf610_gpio_port *port =
> @@ -362,6 +375,12 @@ static int vf610_gpio_probe(struct platform_device *pdev)
>   	gc->get = vf610_gpio_get;
>   	gc->direction_output = vf610_gpio_direction_output;
>   	gc->set = vf610_gpio_set;
> +	/*
> +	 * only IP has Port Data Direction Register(PDDR) can
> +	 * support get direction
> +	 */
> +	if (port->sdata->have_paddr)
> +		gc->get_direction = vf610_gpio_get_direction;
>
>   	/* Mask all GPIO interrupts */
>   	for (i = 0; i < gc->ngpio; i++)