linux-kernel - [PATCH 3/4] dt-bindings: drm/bridge: analogix-anx78xx: support bypass GPIO

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Message-Id: <20191209122013.178564-4-hsinyi@chromium.org>
Date:   Mon,  9 Dec 2019 20:20:12 +0800
From:   Hsin-Yi Wang <hsinyi@...omium.org>
To:     dri-devel@...ts.freedesktop.org
Cc:     Archit Taneja <architt@...eaurora.org>,
        Nicolas Boichat <drinkcat@...omium.org>,
        Enric Balletbo i Serra <enric.balletbo@...labora.com>,
        Thierry Reding <treding@...dia.com>,
        Russell King <rmk+kernel@....linux.org.uk>,
        Matthias Brugger <mbrugger@...e.com>, p.zabel@...gutronix.de,
        linux-kernel@...r.kernel.org
Subject: [PATCH 3/4] dt-bindings: drm/bridge: analogix-anx78xx: support bypass GPIO

Support optional feature: bypass GPIO.

Some SoC (eg. mt8173) have a hardware mux that connects to 2 ports:
anx7688 and hdmi. When the GPIO is active, the bridge is bypassed.

Signed-off-by: Hsin-Yi Wang <hsinyi@...omium.org>
---
 .../bindings/display/bridge/anx7688.txt       | 40 ++++++++++++++++++-
 1 file changed, 39 insertions(+), 1 deletion(-)

diff --git a/Documentation/devicetree/bindings/display/bridge/anx7688.txt b/Documentation/devicetree/bindings/display/bridge/anx7688.txt
index 78b55bdb18f7..44185dcac839 100644
--- a/Documentation/devicetree/bindings/display/bridge/anx7688.txt
+++ b/Documentation/devicetree/bindings/display/bridge/anx7688.txt
@@ -15,10 +15,13 @@ Required properties:
 Optional properties:
 
  - Video port for HDMI input, using the DT bindings defined in [1].
+ - bypass-gpios        : External GPIO. If this GPIO is active, we assume
+ the bridge is bypassed (e.g. by a mux).
+ - pinctrl-0, pinctrl-names: the pincontrol settings to configure bypass GPIO.
 
 [1]: Documentation/devicetree/bindings/media/video-interfaces.txt
 
-Example:
+Example 1:
 
 	anx7688: anx7688@2c {
 		compatible = "analogix,anx7688";
@@ -30,3 +33,38 @@ Example:
 			};
 		};
 	};
+
+Example 2:
+
+       anx7688: anx7688@2c {
+               compatible = "analogix,anx7688";
+               status = "okay";
+               reg = <0x2c>;
+               ddc-i2c-bus = <&hdmiddc0>;
+
+               bypass-gpios = <&pio 36 GPIO_ACTIVE_HIGH>;
+               pinctrl-names = "default";
+               pinctrl-0 = <&hdmi_mux_pins>;
+
+               ports {
+                       #address-cells = <1>;
+                       #size-cells = <0>;
+
+                       port@0 { /* input */
+                               reg = <0>;
+
+                               anx7688_in: endpoint {
+                                       remote-endpoint = <&hdmi_out_anx>;
+                               };
+                       };
+
+                       port@1 { /* output */
+                               reg = <1>;
+
+                               anx7688_out: endpoint {
+                                       remote-endpoint = <&hdmi_connector_in>;
+                               };
+                       };
+               };
+       };
+
-- 
2.24.0.393.g34dc348eaf-goog