Hi,
since backlight will only come in 3.9, I can add some remarks myself, so I
don't forget them next time.
On Saturday 17 November 2012 00:20:32 Marc Dietrich wrote:
> This enables backlight using power sequences.
>
> Signed-off-by: Marc Dietrich <marvin24@xxxxxx>
> ---
> arch/arm/boot/dts/tegra20-paz00.dts | 72
> +++++++++++++++++++++++++++++++++++ 1 file changed, 72 insertions(+)
>
> diff --git a/arch/arm/boot/dts/tegra20-paz00.dts
> b/arch/arm/boot/dts/tegra20-paz00.dts index 8a14e1d..7349aa3 100644
> --- a/arch/arm/boot/dts/tegra20-paz00.dts
> +++ b/arch/arm/boot/dts/tegra20-paz00.dts
> @@ -15,6 +15,10 @@
> rgb {
> status = "okay";
> nvidia,ddc-i2c-bus = <&lvds_ddc>;
> +
> + display {
> + nvidia,backlight = <&backlight>;
> + };
> };
> };
> };
> @@ -461,6 +465,74 @@
> };
> };
>
> + backlight: backlight {
> + compatible = "pwm-backlight";
> + brightness-levels = <0 16 32 48 64 80 96 112 128 144 160 176 192 208
224
> 240 255>; + default-brightness-level = <12>;
> +
> + /* resources used by the power sequences */
> + pwms = <&pwm 0 5000000>;
> + pwm-names = "backlight";
> +
> + power-sequences {
> + power-on {
> + step0 {
> + type = "pwm";
> + id = "backlight";
> + enable;
> + };
> + step1 {
> + type = "gpio";
> + gpio = <&gpio 4 0>; /* gpio PA4, en_vdd_pnl */
> + value = <1>;
> + };
> + step2 {
> + type = "gpio";
> + gpio = <&gpio 176 0>; /* gpio PW0, bl_vdd */
this one needs to be removed as it is not used. There is bl_pwm (gpio U3)
however which I cannot sort in here.
> + value = <1>;
> + };
> + step3 {
> + type = "gpio";
> + gpio = <&gpio 102 0>; /* gpio PM6, lvds_shdn */
> + value = <1>;
> + };
> + step4 {
> + type = "gpio";
> + gpio = <&gpio 164 0>; /* gpio PU4, bl_enb */
> + value = <1>;
> + };
> + };
> +
> + power-off {
> + step4 {
> + type = "gpio";
> + gpio = <&gpio 164 0>; /* gpio PU4, bl_enb */
> + value = <0>;
and this is totally bogus.
/me notes: better do not send patches after midnight!
Marc
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