[PATCH] drm/omap: sharp ls037v7dw01: restore optional GPIOs

[Uwe Kleine-König]

The binding document for this device says that all GPIOs are optional,
panel-sharp-ls037v7dw01: probe of display failed with error -2
Unfortunately, commit ca8c67dafdb7 ("fbdev: omap2: improve usage of
gpiod API") removed the -ENOENT handling without converting the
gpiod function to use the optional variant, causing all GPIOs to become
mandatory.
Since the LDP hard-wires some of the panel control signals, there are
no GPIOs that could be specified in DT to satisfy this.
Switch the driver to use the devm_gpiod_get_index_optional() rather
than devm_gpiod_get_index() to conform to its binding documentation.
Fixes: ca8c67dafdb7 ("fbdev: omap2: improve usage of gpiod API")

Right, it seems I missed that the GPIOs were optional before
ca8c67dafdb7. Thanks for catching (and sorry for having to catch).

Acked-by: Uwe Kleine-König <u.kleine-***@pengutronix.de>

Best regards
Uwe

[Tony Lindgren]

The binding document for this device says that all GPIOs are optional,
panel-sharp-ls037v7dw01: probe of display failed with error -2
Unfortunately, commit ca8c67dafdb7 ("fbdev: omap2: improve usage of
gpiod API") removed the -ENOENT handling without converting the
gpiod function to use the optional variant, causing all GPIOs to become
mandatory.
Since the LDP hard-wires some of the panel control signals, there are
no GPIOs that could be specified in DT to satisfy this.
Switch the driver to use the devm_gpiod_get_index_optional() rather
than devm_gpiod_get_index() to conform to its binding documentation.
Fixes: ca8c67dafdb7 ("fbdev: omap2: improve usage of gpiod API")

Acked-by: Tony Lindgren <***@atomide.com>