linux-kernel - [RFC/patch 2/2] arm64: boot: dts: qcom: surface duo: add minimal framebuffer

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Date:   Fri, 17 Dec 2021 14:57:57 +0200
From:   Felipe Balbi <balbi@...nel.org>
To:     Andy Gross <agross@...nel.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Konrad Dybcio <konrad.dybcio@...ainline.org>
Cc:     Rob Herring <robh+dt@...nel.org>, linux-arm-msm@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        Felipe Balbi <felipe.balbi@...rosoft.com>
Subject: [RFC/patch 2/2] arm64: boot: dts: qcom: surface duo: add minimal framebuffer

From: Felipe Balbi <felipe.balbi@...rosoft.com>

Add a minimal framebuffer device so we can use the display on the
Surface Duo device.

Signed-off-by: Felipe Balbi <felipe.balbi@...rosoft.com>
---
 .../dts/qcom/sm8150-microsoft-surface-duo.dts | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)

diff --git a/arch/arm64/boot/dts/qcom/sm8150-microsoft-surface-duo.dts b/arch/arm64/boot/dts/qcom/sm8150-microsoft-surface-duo.dts
index a73317e1a824..c629ec115fec 100644
--- a/arch/arm64/boot/dts/qcom/sm8150-microsoft-surface-duo.dts
+++ b/arch/arm64/boot/dts/qcom/sm8150-microsoft-surface-duo.dts
@@ -25,6 +25,17 @@ chosen {
 		stdout-path = "serial0:115200n8";
 	};
 
+	framebuffer0: framebuffer@...00000 {
+		compatible = "simple-framebuffer";
+		reg = <0 0x9c000000 0 0x02400000>;
+		status = "okay";
+
+		height = <1800>;
+		width = <1350>;
+		stride = <(1350 * 4)>;
+		format = "a8r8g8b8";
+	};
+
 	vph_pwr: vph-pwr-regulator {
 		compatible = "regulator-fixed";
 		regulator-name = "vph_pwr";
@@ -472,6 +483,14 @@ &pon_resin {
 	linux,code = <KEY_VOLUMEDOWN>;
 };
 
+&reserved_memory {
+	splash_region: splash_region@...00000 {
+		/* We expect the bootloader to fill in the size */
+		reg = <0x0 0x9c000000 0x0 0x0>;
+		no-map;
+	};
+};
+
 &tlmm {
 	gpio-reserved-ranges = <126 4>;
 
-- 
2.34.1