linux-kernel - [PATCH 1/3] dt-bindings: new binding for Himax HX8357D display panels

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Message-Id: <20181024184313.2967-2-eric@anholt.net>
Date:   Wed, 24 Oct 2018 11:43:11 -0700
From:   Eric Anholt <eric@...olt.net>
To:     dri-devel@...ts.freedesktop.org,
        Noralf Trønnes <noralf@...nnes.org>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>, devicetree@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org,
        Heiner Kallweit <hkallweit1@...il.com>,
        Eric Anholt <eric@...olt.net>
Subject: [PATCH 1/3] dt-bindings: new binding for Himax HX8357D display panels

This adds a new binding for Himax HX8357D display panels. It includes
a compatible string for one display (more can be added in the future).

The YX350HV15 panel[1] is found in the Adafruit PiTFT 3.5" Touch
Screen for Raspberry Pi.

[1] https://learn.adafruit.com/adafruit-pitft-3-dot-5-touch-screen-for-raspberry-pi/downloads

This binding is closely modeled after the ili9341 binding, for a
similar product from adafruit.  The primary difference is that the
hx8367d doesn't have a reset line that I can find in the schematics.

Signed-off-by: Eric Anholt <eric@...olt.net>
---
 .../bindings/display/himax,hx8357d.txt        | 25 +++++++++++++++++++
 1 file changed, 25 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/display/himax,hx8357d.txt

diff --git a/Documentation/devicetree/bindings/display/himax,hx8357d.txt b/Documentation/devicetree/bindings/display/himax,hx8357d.txt
new file mode 100644
index 000000000000..48586e570be0
--- /dev/null
+++ b/Documentation/devicetree/bindings/display/himax,hx8357d.txt
@@ -0,0 +1,25 @@
+Himax HX8357D display panels
+
+This binding is for display panels using a Himax HX8357D controller in SPI
+mode, such as the Adafruit 3.5" TFT for Raspberry Pi.
+
+Required properties:
+- compatible:	"adafruit,yx350hv15", "himax,hx8357d"
+- dc-gpios:	D/C pin
+
+The node for this driver must be a child node of a SPI controller, hence
+all mandatory properties described in ../spi/spi-bus.txt must be specified.
+
+Optional properties:
+- rotation:	panel rotation in degrees counter clockwise (0,90,180,270)
+- backlight:	phandle of the backlight device attached to the panel
+
+Example:
+	display@0{
+		compatible = "adafruit,yx350hv15", "himax,hx8357d";
+		reg = <0>;
+		spi-max-frequency = <32000000>;
+		dc-gpios = <&gpio0 25 GPIO_ACTIVE_HIGH>;
+		rotation = <90>;
+		backlight = <&backlight>;
+	};
-- 
2.19.1