linux-kernel - [PATCH v3 1/2] dt-bindings: meson: add specific simplefb bindings

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Message-Id: <20190116124030.16882-2-mjourdan@baylibre.com>
Date:   Wed, 16 Jan 2019 13:40:29 +0100
From:   Maxime Jourdan <mjourdan@...libre.com>
To:     Kevin Hilman <khilman@...libre.com>
Cc:     Maxime Jourdan <mjourdan@...libre.com>,
        Rob Herring <robh@...nel.org>,
        Neil Armstrong <narmstrong@...libre.com>,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-amlogic@...ts.infradead.org, devicetree@...r.kernel.org
Subject: [PATCH v3 1/2] dt-bindings: meson: add specific simplefb bindings

Similar to simple-framebuffer-sunxi, we support different display pipelines
that the firmware is free to choose from.

This documents the "amlogic,simple-framebuffer" compatible and the
"amlogic,pipeline" extension.

Reviewed-by: Rob Herring <robh@...nel.org>
Signed-off-by: Maxime Jourdan <mjourdan@...libre.com>
---
 .../display/amlogic,simple-framebuffer.txt    | 33 +++++++++++++++++++
 1 file changed, 33 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/display/amlogic,simple-framebuffer.txt

diff --git a/Documentation/devicetree/bindings/display/amlogic,simple-framebuffer.txt b/Documentation/devicetree/bindings/display/amlogic,simple-framebuffer.txt
new file mode 100644
index 000000000000..aaa6c24c8e70
--- /dev/null
+++ b/Documentation/devicetree/bindings/display/amlogic,simple-framebuffer.txt
@@ -0,0 +1,33 @@
+Meson specific Simple Framebuffer bindings
+
+This binding documents meson specific extensions to the simple-framebuffer
+bindings. The meson simplefb u-boot code relies on the devicetree containing
+pre-populated simplefb nodes.
+
+These extensions are intended so that u-boot can select the right node based
+on which pipeline is being used. As such they are solely intended for
+firmware / bootloader use, and the OS should ignore them.
+
+Required properties:
+- compatible: "amlogic,simple-framebuffer", "simple-framebuffer"
+- amlogic,pipeline, one of:
+  "vpu-cvbs"
+  "vpu-hdmi"
+
+Example:
+
+chosen {
+	#address-cells = <2>;
+	#size-cells = <2>;
+	ranges;
+
+	simplefb_hdmi: framebuffer-hdmi {
+		compatible = "amlogic,simple-framebuffer",
+			     "simple-framebuffer";
+		amlogic,pipeline = "vpu-hdmi";
+		clocks = <&clkc CLKID_HDMI_PCLK>,
+			 <&clkc CLKID_CLK81>,
+			 <&clkc CLKID_GCLK_VENCI_INT0>;
+		power-domains = <&pwrc_vpu>;
+	};
+};
-- 
2.20.1