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Convert the common GPIO, LED, and PWM backlight bindings to DT schema format. Given there's only 2 common properties and the descriptions are slightly different, I opted to not create a common backlight schema. Cc: Lee Jones <lee.jones@linaro.org> Cc: Daniel Thompson <daniel.thompson@linaro.org> Cc: Jingoo Han <jingoohan1@gmail.com> Cc: Sam Ravnborg <sam@ravnborg.org> Acked-by: Sam Ravnborg <sam@ravnborg.org> Link: https://lore.kernel.org/r/20200630200111.1170742-1-robh@kernel.org Signed-off-by: Rob Herring <robh@kernel.org>