On Thu, Oct 01, 2026 at 08:57:52AM +0200, Krzysztof Kozlowski wrote: > On 01/10/2026 08:55, Krzysztof Kozlowski wrote: > > On Tue, Sep 29, 2026 at 06:42:20PM +0530, Arpit Saini wrote: > >> Some boards drive the ILI7807S panel's backlight from an external > >> WLED driver whose enable input is wired to a GPIO, typically modeled > >> as a fixed regulator (e.g. vreg_wled). > > > > You describe something else. What's fixed regulator should not matter > > here. Which pin is it in ILI7807S? > > > > It seems you just want to represent GPIO with a regulator. This is just > > confusing and typical downstream workaround. > > What's more, you basically REVERT the review YOU RECEIVED in v1. Really, > just sneak the same stuff 3 months after like the review never happened. > > NAK
After discussing this offline with Krzysztof. It's not a supply (my fault), it's an LCD driver. So, the best way to handle your displaycard seems to add a gpio-backlight, reference it from the panel and then in the driver check for the backlight's max_brightness level. If it's 1, then you have to send extra DCS commands to control PWM. If it's higher, use normal backlight class controls. -- With best wishes Dmitry
