Hi Hans, thank you for your patch! On Fri, Nov 29, 2019 at 7:58 PM Hans de Goede <hdegoede@xxxxxxxxxx> wrote: > - /* GPIO Desc for CRC based Panel control */ > + /* GPIO Desc for panel and backlight control */ > struct gpio_desc *gpio_panel; > + struct gpio_desc *gpio_backlight; I think what happens here is that you reimplement drivers/video/backlight/gpio_backlight.c The existing power control GPIO also reimplements drivers/regulator/fixed.c in a sense but I am under the impression that x86 in general and ACPI in particular has a problem with the regulator subsystem so I am uncertain about that one. When I look at the code I get more confused because nominally panels should have their own drivers in drivers/gpu/drm/panel/* especially DSI panels, and the panels control their own GPIOs or regulators for power and backlight. I was under the impression that Heikki's and Dmitry's recent additions to software nodes would make it possible to actually spawn devices like the GPIO backlight and/or fixed regulator and put references to them so that the drivers can pick them up from the respective frameworks and manage them? Maybe I misunderstood things here though, I am a bit under the impression that elder DRM drivers are considered "elder gods" and do not need to use separate panel drivers, backlight abstraction etc, and in that case just go ahead, I guess. But I suspect some separation would help the day the i915 driver wants to reuse some really complex DSI panel from drivers/gpu/drm/panel/* though. Yours, Linus Walleij _______________________________________________ dri-devel mailing list dri-devel@xxxxxxxxxxxxxxxxxxxxx https://lists.freedesktop.org/mailman/listinfo/dri-devel
