linux-kernel - Re: [PATCH] gpiolib: of: Use correct fwnode for DT-probed chips

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Message-ID: <20221114211236.pfnobreab6twcqw4@halaney-x13s>
Date:   Mon, 14 Nov 2022 15:12:36 -0600
From:   Andrew Halaney <ahalaney@...hat.com>
To:     Thierry Reding <thierry.reding@...il.com>
Cc:     Bartosz Golaszewski <brgl@...ev.pl>,
        Linus Walleij <linus.walleij@...aro.org>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Dmitry Torokhov <dmitry.torokhov@...il.com>,
        linux-gpio@...r.kernel.org, linux-kernel@...r.kernel.org,
        Marek Szyprowski <m.szyprowski@...sung.com>
Subject: Re: [PATCH] gpiolib: of: Use correct fwnode for DT-probed chips

On Fri, Nov 11, 2022 at 12:37:32PM +0100, Thierry Reding wrote:
> From: Thierry Reding <treding@...dia.com>
> 
> The OF node store in chip->fwnode is used to explicitly override the FW
> node for a GPIO chip. For chips that use the default FW node (i.e. that
> of their parent device), this will be NULL and cause the chip not to be
> fully registered.
> 
> Instead, use the GPIO device's FW node, which is set to either the node
> of the parent device or the explicit override in chip->fwnode.
> 
> Fixes: 8afe82550240 ("gpiolib: of: Prepare of_gpiochip_add() / of_gpiochip_remove() for fwnode")
> Tested-by: Marek Szyprowski <m.szyprowski@...sung.com>
> Signed-off-by: Thierry Reding <treding@...dia.com>

Tested-by: Andrew Halaney <ahalaney@...hat.com>

This fixes issues I ran into today on my sa8540p-ride board.

Thanks,
Andrew

> ---
>  drivers/gpio/gpiolib-of.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/gpio/gpiolib-of.c b/drivers/gpio/gpiolib-of.c
> index 4be3c21aa718..55c3712592db 100644
> --- a/drivers/gpio/gpiolib-of.c
> +++ b/drivers/gpio/gpiolib-of.c
> @@ -1067,7 +1067,7 @@ int of_gpiochip_add(struct gpio_chip *chip)
>  	struct device_node *np;
>  	int ret;
>  
> -	np = to_of_node(chip->fwnode);
> +	np = to_of_node(dev_fwnode(&chip->gpiodev->dev));
>  	if (!np)
>  		return 0;
>  
> -- 
> 2.38.1
>