Re: [PATCH] staging: fbtft: add support for a device tree of backlight.

[Greg KH <gregkh@linuxfoundation.org>]

On Fri, Jul 25, 2025 at 08:04:16PM -0400, chalianis1@gmail.com wrote:
> From: Chali Anis <chalianis1@gmail.com>
> 
> Support the of backlight from device tree and keep compatibility
> for the legacy gpio backlight.
> 
> Cc: stable@vger.kernel.org
> Signed-off-by: Chali Anis <chalianis1@gmail.com>
> ---
>  drivers/staging/fbtft/fbtft-core.c | 12 ++++++++++++
>  1 file changed, 12 insertions(+)
> 
> diff --git a/drivers/staging/fbtft/fbtft-core.c b/drivers/staging/fbtft/fbtft-core.c
> index da9c64152a60..5f0220dbe397 100644
> --- a/drivers/staging/fbtft/fbtft-core.c
> +++ b/drivers/staging/fbtft/fbtft-core.c
> @@ -170,6 +170,18 @@ void fbtft_register_backlight(struct fbtft_par *par)
>  	struct backlight_device *bd;
>  	struct backlight_properties bl_props = { 0, };
>  
> +	bd = devm_of_find_backlight(par->info->device);
> +	if (IS_ERR(bd)) {
> +		dev_warn(par->info->device,
> +			"cannot find of backlight device (%ld), trying legacy\n",
> +			PTR_ERR(bd));

So now you are going to get a warning message for a system that
previously did not at all?  That's not very nice to those users :(