Re: [linux-sunxi] [PATCH v2 5/5] arm64: allwinner: dts: a64: add LCD-related device nodes for PinePhone

[Ondřej Jirman]

On Thu, Mar 19, 2020 at 10:51:36PM +0800, Icenowy Zheng wrote:
> 在 2020-03-16星期一的 21:35 +0800，Icenowy Zheng写道：
> > PinePhone uses PWM backlight and a XBD599 LCD panel over DSI for
> > display.
> > 
> > Add its device nodes.
> > 
> > Signed-off-by: Icenowy Zheng <icen...@aosc.io>
> > ---
> > No changes in v2.
> > 
> >  .../dts/allwinner/sun50i-a64-pinephone.dtsi   | 37
> > +++++++++++++++++++
> >  1 file changed, 37 insertions(+)
> > 
> > diff --git a/arch/arm64/boot/dts/allwinner/sun50i-a64-pinephone.dtsi
> > b/arch/arm64/boot/dts/allwinner/sun50i-a64-pinephone.dtsi
> > index cefda145c3c9..96d9150423e0 100644
> > --- a/arch/arm64/boot/dts/allwinner/sun50i-a64-pinephone.dtsi
> > +++ b/arch/arm64/boot/dts/allwinner/sun50i-a64-pinephone.dtsi
> > @@ -16,6 +16,15 @@ aliases {
> >             serial0 = &uart0;
> >     };
> >  
> > +   backlight: backlight {
> > +           compatible = "pwm-backlight";
> > +           pwms = <&r_pwm 0 50000 PWM_POLARITY_INVERTED>;
> > +           brightness-levels = <0 16 18 20 22 24 26 29 32 35 38 42
> > 46 51 56 62 68 75 83 91 100>;
> 
> Should I drop the 0 here and replace it with 14?

Almost all boards in arm/boot/dts start at 0.

> I have heard community complaining about setting 0 to brightness make
> the screen black.

Level 0 (first value in the list) is special, and turns off the backlight:

123         if (brightness > 0) {
124                 pwm_get_state(pb->pwm, &state);
125                 state.duty_cycle = compute_duty_cycle(pb, brightness);
126                 pwm_apply_state(pb->pwm, &state);
127                 pwm_backlight_power_on(pb);
128         } else {
129                 pwm_backlight_power_off(pb);
130         }

        o.

> (I think in this situation bl_power or blank the DSI panel can still
> totally shut down the backlight).
> 
> > +           default-brightness-level = <15>;
> > +           enable-gpios = <&pio 7 10 GPIO_ACTIVE_HIGH>; /* PH10 */
> > +           power-supply = <&reg_ldo_io0>;
> > +   };
> > +
> >     chosen {
> >             stdout-path = "serial0:115200n8";
> >     };
> > @@ -84,6 +93,30 @@ &dai {
> >     status = "okay";
> >  };
> >  
> > +&de {
> > +   status = "okay";
> > +};
> > +
> > +&dphy {
> > +   status = "okay";
> > +};
> > +
> > +&dsi {
> > +   vcc-dsi-supply = <&reg_dldo1>;
> > +   #address-cells = <1>;
> > +   #size-cells = <0>;
> > +   status = "okay";
> > +
> > +   panel@0 {
> > +           compatible = "xingbangda,xbd599";
> > +           reg = <0>;
> > +           reset-gpios = <&pio 3 23 GPIO_ACTIVE_LOW>; /* PD23 */
> > +           iovcc-supply = <&reg_dldo2>;
> > +           vcc-supply = <&reg_ldo_io0>;
> > +           backlight = <&backlight>;
> > +   };
> > +};
> > +
> >  &ehci0 {
> >     status = "okay";
> >  };
> > @@ -188,6 +221,10 @@ &r_pio {
> >      */
> >  };
> >  
> > +&r_pwm {
> > +   status = "okay";
> > +};
> > +
> >  &r_rsb {
> >     status = "okay";
> >  
> > -- 
> > 2.24.1
> > 
> 

-- 
You received this message because you are subscribed to the Google Groups 
"linux-sunxi" group.
To unsubscribe from this group and stop receiving emails from it, send an email 
to linux-sunxi+unsubscr...@googlegroups.com.
To view this discussion on the web, visit 
https://groups.google.com/d/msgid/linux-sunxi/20200319161002.kmivhr3ouhoyn4bt%40core.my.home.