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The Waveshare DSI TOUCH family of panels has separate on-board GPIO controller, which controls power supplies to the panel and the touch screen and provides reset pins for both the panel and the touchscreen. Also it provides a simple PWM controller for panel backlight. Add bindings for these GPIO controllers. As overall integration might be not very obvious (and it differs significantly from the bindings used by the original drivers), provide complete example with the on-board regulators and the DSI panel. Acked-by: Conor Dooley <conor.dooley@microchip.com> Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com> Link: https://patch.msgid.link/20260507-waveshare-dsi-touch-v5-1-d2ac7ccc22d4@oss.qualcomm.com Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@oss.qualcomm.com>