On Mon, Mar 25, 2013 at 06:21:52PM -0700, Andrew Chew wrote:
> The pwm-backlight driver now takes a mandatory regulator that is gotten
> during driver probe. Initialize a dummy regulator to satisfy this
> requirement.
>
> Signed-off-by: Andrew Chew <achew@xxxxxxxxxx>
> Acked-by: Alexandre Courbot <acourbot@xxxxxxxxxx>
> Acked-by: Stephen Warren <swarren@xxxxxxxxxx>
> ---
> arch/arm/boot/dts/tegra20-medcom-wide.dts | 1 +
> arch/arm/boot/dts/tegra20-tamonten.dtsi | 5 +++++
> 2 files changed, 6 insertions(+)
>
> diff --git a/arch/arm/boot/dts/tegra20-medcom-wide.dts b/arch/arm/boot/dts/tegra20-medcom-wide.dts
> index a2d6d65..90d665e 100644
> --- a/arch/arm/boot/dts/tegra20-medcom-wide.dts
> +++ b/arch/arm/boot/dts/tegra20-medcom-wide.dts
> @@ -32,6 +32,7 @@
>
> brightness-levels = <0 4 8 16 32 64 128 255>;
> default-brightness-level = <6>;
> + power-supply = <&backlight_power_reg>;
> };
>
> sound {
> diff --git a/arch/arm/boot/dts/tegra20-tamonten.dtsi b/arch/arm/boot/dts/tegra20-tamonten.dtsi
> index 6e9d91f..2d8e7f2 100644
> --- a/arch/arm/boot/dts/tegra20-tamonten.dtsi
> +++ b/arch/arm/boot/dts/tegra20-tamonten.dtsi
> @@ -485,5 +485,10 @@
> regulator-max-microvolt = <5000000>;
> regulator-always-on;
> };
> +
> + backlight_power_reg: regulator@1 {
> + compatible = "regulator-fixed";
> + regulator-name = "backlight-power";
> + };
This is missing a reg property to mirror the unit address "@1". I've
just checked the schematics and there is indeed a physical pin that
can be used to enable backlight power on Tamonten. It just happens to
not be connected on Medcom-Wide for some reason.
The physical pin is Tegra's GPIO PB5 and the schematic calls the supply
"lcd_bl_en", so I think a more accurate description of this would be:
backlight_power_reg: regulator@1 {
compatible = "regulator-fixed";
reg = <1>;
regulator-name = "lcd_bl_en";
regulator-min-microvolt = <3300000>;
regulator-max-microvolt = <3300000>;
gpio = <&gpio 13 0>; /* gpio PB5 */
enable-active-high;
};
Thierry
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