[PATCH V5 8/9] ARM: tegra: Provide regulator to pwm-backlight
From: Thierry Reding <hidden>
Date: 2013-03-26 07:26:13
Also in:
linux-samsung-soc, linux-tegra
On Mon, Mar 25, 2013 at 06:21:52PM -0700, Andrew Chew wrote:
quoted hunk ↗ jump to hunk
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 <redacted> Acked-by: Alexandre Courbot <acourbot@nvidia.com> Acked-by: Stephen Warren <redacted> --- 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 at 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 at 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
-------------- next part --------------
A non-text attachment was scrubbed...
Name: not available
Type: application/pgp-signature
Size: 836 bytes
Desc: not available
URL: <http://lists.infradead.org/pipermail/linux-arm-kernel/attachments/20130326/777ee6c2/attachment.sig>