linux-kernel - [PATCH v10 4/5] ARM: dts: stm32: add display support on stm32f769-disco

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Message-ID: <20240127152853.65937-5-dario.binacchi@amarulasolutions.com>
Date: Sat, 27 Jan 2024 16:28:48 +0100
From: Dario Binacchi <dario.binacchi@...rulasolutions.com>
To: linux-kernel@...r.kernel.org
Cc: linux-amarula@...rulasolutions.com,
	Raphael Gallais-Pou <raphael.gallais-pou@...s.st.com>,
	Lee Jones <lee@...nel.org>,
	Alexandre Torgue <alexandre.torgue@...s.st.com>,
	Dario Binacchi <dario.binacchi@...rulasolutions.com>,
	Conor Dooley <conor+dt@...nel.org>,
	Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
	Maxime Coquelin <mcoquelin.stm32@...il.com>,
	Rob Herring <robh+dt@...nel.org>,
	devicetree@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	linux-stm32@...md-mailman.stormreply.com
Subject: [PATCH v10 4/5] ARM: dts: stm32: add display support on stm32f769-disco

The patch adds display support on the stm32f769-disco board.

Signed-off-by: Dario Binacchi <dario.binacchi@...rulasolutions.com>

---

Changes in v10:
- Drop backlight. From a closer analysis of the schematics
  en.MB1225-F769I-B01_Schematic.pdf and en.mb1166-default-a09-schematic.pdf,
  it is noticed that the GPIO I14 is connected to an unmounted
  resistor (n/a), making the backlight functionality via GPIO unusable.

Changes in v9:
- Rename panel-dsi@0 to panel@0 to fix yaml warnings

Changes in v8:
- Remove unit name from 'ltdc/port/endpoint@0' to fix the compiling
  warning:
  ../arch/arm/boot/dts/st/stm32f769-disco.dts:189.28-191.5: Warning
  (unit_address_vs_reg): /soc/display-controller@...16800/port/endpoint@0: node
  has a unit name, but no reg or ranges property

 arch/arm/boot/dts/st/stm32f769-disco.dts | 64 +++++++++++++++++++++++-
 1 file changed, 63 insertions(+), 1 deletion(-)

diff --git a/arch/arm/boot/dts/st/stm32f769-disco.dts b/arch/arm/boot/dts/st/stm32f769-disco.dts
index 660f85984164..52c5baf58ab9 100644
--- a/arch/arm/boot/dts/st/stm32f769-disco.dts
+++ b/arch/arm/boot/dts/st/stm32f769-disco.dts
@@ -41,7 +41,7 @@
  */
 
 /dts-v1/;
-#include "stm32f746.dtsi"
+#include "stm32f769.dtsi"
 #include "stm32f769-pinctrl.dtsi"
 #include <dt-bindings/input/input.h>
 #include <dt-bindings/gpio/gpio.h>
@@ -60,6 +60,19 @@ memory@...00000 {
 		reg = <0xC0000000 0x1000000>;
 	};
 
+	reserved-memory {
+		#address-cells = <1>;
+		#size-cells = <1>;
+		ranges;
+
+		linux,dma {
+			compatible = "shared-dma-pool";
+			linux,dma-default;
+			no-map;
+			size = <0x100000>;
+		};
+	};
+
 	aliases {
 		serial0 = &usart1;
 	};
@@ -114,6 +127,45 @@ &clk_hse {
 	clock-frequency = <25000000>;
 };
 
+&dsi {
+	#address-cells = <1>;
+	#size-cells = <0>;
+	status = "okay";
+
+	ports {
+		#address-cells = <1>;
+		#size-cells = <0>;
+
+		port@0 {
+			reg = <0>;
+			dsi_in: endpoint {
+				remote-endpoint = <&ltdc_out_dsi>;
+			};
+		};
+
+		port@1 {
+			reg = <1>;
+			dsi_out: endpoint {
+				remote-endpoint = <&dsi_panel_in>;
+			};
+		};
+	};
+
+	panel0: panel@0 {
+		compatible = "orisetech,otm8009a";
+		reg = <0>; /* dsi virtual channel (0..3) */
+		reset-gpios = <&gpioj 15 GPIO_ACTIVE_LOW>;
+		power-supply = <&vcc_3v3>;
+		status = "okay";
+
+		port {
+			dsi_panel_in: endpoint {
+				remote-endpoint = <&dsi_out>;
+			};
+		};
+	};
+};
+
 &i2c1 {
 	pinctrl-0 = <&i2c1_pins_b>;
 	pinctrl-names = "default";
@@ -122,6 +174,16 @@ &i2c1 {
 	status = "okay";
 };
 
+&ltdc {
+	status = "okay";
+
+	port {
+		ltdc_out_dsi: endpoint {
+			remote-endpoint = <&dsi_in>;
+		};
+	};
+};
+
 &rtc {
 	status = "okay";
 };
-- 
2.43.0