Re: [PATCH v2] gpio: swnode: restore the swnode-name-against-chip-label matching

[Dmitry Torokhov <dmitry.torokhov@gmail.com>]

On Wed, Feb 11, 2026 at 09:53:13AM +0100, Bartosz Golaszewski wrote:
> Using the remote firmware node for software node lookup is the right
> thing to do. The GPIO controller we want to resolve should have the
> software node we scooped out of the reference attached to it. However,
> there are existing users who abuse the software node API by creating
> dummy swnodes whose name is set to the expected label string of the GPIO
> controller whose pins they want to control and use them in their local
> swnode references as GPIO properties.
> 
> This used to work when we compared the software node's name to the
> chip's label. When we switched to using a real fwnode lookup, these
> users broke down because the firmware nodes in question were never
> attached to the controllers they were looking for.
> 
> Restore the label matching as a fallback to fix the broken users but add
> a big FIXME urging for a better solution.
> 
> Cc: stable@vger.kernel.org # v6.18, v6.19
> Fixes: 216c12047571 ("gpio: swnode: allow referencing GPIO chips by firmware nodes")
> Link: https://lore.kernel.org/all/aYkdKfP5fg6iywgr@jekhomev/
> Acked-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
> Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@oss.qualcomm.com>
> ---
> Changes in v2:
> - check if gdev_node and gdev_node->name are not NULL before trying to
>   match the label (Hans & Dan)
> - use the right link
> - collect tags
> 
>  drivers/gpio/gpiolib-swnode.c | 19 +++++++++++++++++++
>  1 file changed, 19 insertions(+)
> 
> diff --git a/drivers/gpio/gpiolib-swnode.c b/drivers/gpio/gpiolib-swnode.c
> index 21478b45c127d..0d7f3f09a0b4b 100644
> --- a/drivers/gpio/gpiolib-swnode.c
> +++ b/drivers/gpio/gpiolib-swnode.c
> @@ -42,6 +42,25 @@ static struct gpio_device *swnode_get_gpio_device(struct fwnode_handle *fwnode)
>  
>  fwnode_lookup:
>  	gdev = gpio_device_find_by_fwnode(fwnode);

By the way, should we extend gpio_device_find_by_fwnode() to use both
primary and secondary nodes?

Thanks.

-- 
Dmitry