On Mon, 6 Oct 2014 13:01:16 +0200
Thierry Reding [off-list ref] wrote:

On Wed, Oct 01, 2014 at 04:53:07PM +0200, Boris Brezillon wrote:
[...]

quoted

diff --git a/arch/arm/boot/dts/sama5d3xdm.dtsi b/arch/arm/boot/dts/sama5d3xdm.dtsi

[...]

quoted

+	bl_reg: backlight_regulator {
+		compatible = "regulator-fixed";
+		regulator-name = "backlight-power-supply";
+		regulator-min-microvolt = <5000000>;
+		regulator-max-microvolt = <5000000>;
+		status = "disabled";
+	};
+
+	panel_reg: panel_regulator {
+		compatible = "regulator-fixed";
+		regulator-name = "panel-power-supply";
+		regulator-min-microvolt = <3300000>;
+		regulator-max-microvolt = <3300000>;
+		status = "disabled";
+	};
+
+	backlight: backlight {
+		compatible = "pwm-backlight";
+		pwms = <&hlcdc_pwm 0 50000 0>;
+		brightness-levels = <0 4 8 16 32 64 128 255>;
+		default-brightness-level = <6>;
+		power-supply = <&bl_reg>;
+		status = "disabled";
+	};

Why are these all disabled? Patch 11/11 now needs to enable all of them
explicitly for each board that uses this display module.

Yes, these nodes should be enabled. I just thought we could include the
xdm dtsi and enable what we really need in the board file, but it
doesn't make any sense...

quoted

+	panel: panel {
+		compatible = "foxlink,fl500wvr00-a0t", "simple-panel";

"simple-panel" shouldn't be in this list. There's nothing useful a
driver can do by matching on it.

Sure, I'll remove the "simple-panel" compatible string.

quoted

+		backlight = <&backlight>;
+		power-supply = <&panel_reg>;
+		#address-cells = <1>;
+		#size-cells = <0>;
+		status = "disabled";
+
+		port at 0 {
+			#address-cells = <1>;
+			#size-cells = <0>;
+
+			panel_input: endpoint at 0 {
+				reg = <0>;
+				remote-endpoint = <&hlcdc_panel_output>;
+			};
 		};

There's no support for OF graphs in simple-panel, so this is unused,
isn't it?

Actually I use it in my atmel_hlcdc_ouput implementation to figure out
the link between a panel and a device connected on the RGB/DPI bus. 



-- 
Boris Brezillon, Free Electrons
Embedded Linux and Kernel engineering
http://free-electrons.com