[PATCH v3 0/2] arm64: dts: meson: add simple-framebuffer nodes

[PATCH v3 0/2] arm64: dts: meson: add simple-framebuffer nodes

[Maxime Jourdan]

This patch series adds support for simplefb for the GXBB and GXL chips.

simple-framebuffer allows sharing a framebuffer already setup by the
firmware to the kernel for a seamless boot transition.

It goes along with a u-boot patch series adding display support to
GXBB & GXL [3].

Changes since v2 [2]:
 - Renamed bindings file to "amlogic,simple-framebuffer.txt"

Changes since v1 [1]:
 - added cover letter
 - added simple-framebuffer compatible fallback to the bindings
 - Updated node names and removed the unit-address
 - Consolidated base nodes in meson-gx.dtsi
 
[1] https://patchwork.kernel.org/patch/10720879/
[2] https://patchwork.kernel.org/cover/10750205/
[3] https://patchwork.ozlabs.org/project/uboot/list/?series=86214

Maxime Jourdan (2):
  dt-bindings: meson: add specific simplefb bindings
  arm64: dts: meson-gx: add support for simplefb

 .../display/amlogic,simple-framebuffer.txt    | 33 +++++++++++++++++++
 arch/arm64/boot/dts/amlogic/meson-gx.dtsi     | 22 +++++++++++++
 arch/arm64/boot/dts/amlogic/meson-gxbb.dtsi   |  6 ++++
 arch/arm64/boot/dts/amlogic/meson-gxl.dtsi    |  6 ++++
 4 files changed, 67 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/display/amlogic,simple-framebuffer.txt

-- 
2.20.1

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

[Maxime Jourdan]

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@kernel.org>
Signed-off-by: Maxime Jourdan <mjourdan@baylibre.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

[PATCH v3 2/2] arm64: dts: meson-gx: add support for simplefb

[Maxime Jourdan]

SimpleFB allows transferring a framebuffer from the firmware/bootloader
to the kernel, while making sure the related clocks and power supplies
stay enabled.

Add nodes for CVBS and HDMI Simple Framebuffers.

Signed-off-by: Maxime Jourdan <mjourdan@baylibre.com>
---
 arch/arm64/boot/dts/amlogic/meson-gx.dtsi   | 22 +++++++++++++++++++++
 arch/arm64/boot/dts/amlogic/meson-gxbb.dtsi |  6 ++++++
 arch/arm64/boot/dts/amlogic/meson-gxl.dtsi  |  6 ++++++
 3 files changed, 34 insertions(+)

diff --git a/arch/arm64/boot/dts/amlogic/meson-gx.dtsi b/arch/arm64/boot/dts/amlogic/meson-gx.dtsi
index 44c5c51ff1fa..a6ffdbba37b9 100644
--- a/arch/arm64/boot/dts/amlogic/meson-gx.dtsi
+++ b/arch/arm64/boot/dts/amlogic/meson-gx.dtsi
@@ -50,6 +50,28 @@
 		};
 	};
 
+	chosen {
+		#address-cells = <2>;
+		#size-cells = <2>;
+		ranges;
+
+		simplefb_cvbs: framebuffer-cvbs {
+			compatible = "amlogic,simple-framebuffer",
+				     "simple-framebuffer";
+			amlogic,pipeline = "vpu-cvbs";
+			power-domains = <&pwrc_vpu>;
+			status = "disabled";
+		};
+
+		simplefb_hdmi: framebuffer-hdmi {
+			compatible = "amlogic,simple-framebuffer",
+				     "simple-framebuffer";
+			amlogic,pipeline = "vpu-hdmi";
+			power-domains = <&pwrc_vpu>;
+			status = "disabled";
+		};
+	};
+
 	cpus {
 		#address-cells = <0x2>;
 		#size-cells = <0x0>;
diff --git a/arch/arm64/boot/dts/amlogic/meson-gxbb.dtsi b/arch/arm64/boot/dts/amlogic/meson-gxbb.dtsi
index a7b883ced0a8..a60d3652beee 100644
--- a/arch/arm64/boot/dts/amlogic/meson-gxbb.dtsi
+++ b/arch/arm64/boot/dts/amlogic/meson-gxbb.dtsi
@@ -784,6 +784,12 @@
 	resets = <&reset RESET_SD_EMMC_C>;
 };
 
+&simplefb_hdmi {
+	clocks = <&clkc CLKID_HDMI_PCLK>,
+		 <&clkc CLKID_CLK81>,
+		 <&clkc CLKID_GCLK_VENCI_INT0>;
+};
+
 &spicc {
 	clocks = <&clkc CLKID_SPICC>;
 	clock-names = "core";
diff --git a/arch/arm64/boot/dts/amlogic/meson-gxl.dtsi b/arch/arm64/boot/dts/amlogic/meson-gxl.dtsi
index d5c3d78aafeb..3093ae421b17 100644
--- a/arch/arm64/boot/dts/amlogic/meson-gxl.dtsi
+++ b/arch/arm64/boot/dts/amlogic/meson-gxl.dtsi
@@ -787,6 +787,12 @@
 	resets = <&reset RESET_SD_EMMC_C>;
 };
 
+&simplefb_hdmi {
+	clocks = <&clkc CLKID_HDMI_PCLK>,
+		 <&clkc CLKID_CLK81>,
+		 <&clkc CLKID_GCLK_VENCI_INT0>;
+};
+
 &spicc {
 	clocks = <&clkc CLKID_SPICC>;
 	clock-names = "core";
-- 
2.20.1

Re: [PATCH v3 0/2] arm64: dts: meson: add simple-framebuffer nodes

[Kevin Hilman]

Maxime Jourdan <mjourdan@baylibre.com> writes:

> This patch series adds support for simplefb for the GXBB and GXL chips.
>
> simple-framebuffer allows sharing a framebuffer already setup by the
> firmware to the kernel for a seamless boot transition.
>
> It goes along with a u-boot patch series adding display support to
> GXBB & GXL [3].
>

Queued for v5.1 (branch: v5.1/dt64)

Kevin