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From: Jacopo Mondi <jacopo+renesas@jmondi.org>
To: "Geert Uytterhoeven" <geert+renesas@glider.be>,
	"Magnus Damm" <magnus.damm@gmail.com>,
	"Laurent Pinchart" <laurent.pinchart@ideasonboard.com>,
	"Kieran Bingham" <kieran.bingham@ideasonboard.com>,
	"Niklas Söderlund" <niklas.soderlund+renesas@ragnatech.se>,
	"Rob Herring" <robh+dt@kernel.org>
Cc: Jacopo Mondi <jacopo+renesas@jmondi.org>,
	linux-renesas-soc@vger.kernel.org, linux-media@vger.kernel.org,
	devicetree@vger.kernel.org, linux-kernel@vger.kernel.org,
	Rob Herring <robh@kernel.org>
Subject: [PATCH v6 2/8] dt-bindings: media: max9286: Define 'maxim,gpio-poc'
Date: Thu, 22 Jul 2021 11:12:33 +0200	[thread overview]
Message-ID: <20210722091239.26451-3-jacopo+renesas@jmondi.org> (raw)
In-Reply-To: <20210722091239.26451-1-jacopo+renesas@jmondi.org>

Define a new vendor property in the maxim,max9286 binding schema.

The new property allows to declare that the remote camera
power-over-coax is controlled by one of the MAX9286 gpio lines.

As it is currently not possible to establish a regulator as consumer
of the MAX9286 gpio controller for this purpose, the property allows to
declare that the camera power is controlled by the MAX9286 directly.

The property accepts a gpio-index (0 or 1) and one line polarity
flag as defined by dt-bindings/gpio/gpio.h.

Reviewed-by: Rob Herring <robh@kernel.org>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Jacopo Mondi <jacopo+renesas@jmondi.org>
---
 .../bindings/media/i2c/maxim,max9286.yaml     | 67 ++++++++++++++++++-
 1 file changed, 66 insertions(+), 1 deletion(-)

diff --git a/Documentation/devicetree/bindings/media/i2c/maxim,max9286.yaml b/Documentation/devicetree/bindings/media/i2c/maxim,max9286.yaml
index 0e7162998b77..bf93fa73ce41 100644
--- a/Documentation/devicetree/bindings/media/i2c/maxim,max9286.yaml
+++ b/Documentation/devicetree/bindings/media/i2c/maxim,max9286.yaml
@@ -70,6 +70,28 @@ properties:
       a remote serializer whose high-threshold noise immunity is not enabled
       is 100000 micro volts
 
+  maxim,gpio-poc:
+    $ref: '/schemas/types.yaml#/definitions/uint32-array'
+    minItems: 2
+    maxItems: 2
+    description: |
+      Index of the MAX9286 gpio output line (0 or 1) that controls Power over
+      Coax to the cameras and its associated polarity flag.
+
+      The property accepts an array of two unsigned integers, the first being
+      the gpio line index (0 or 1) and the second being the gpio line polarity
+      flag (GPIO_ACTIVE_HIGH or GPIO_ACTIVE_LOW) as defined in
+      <include/dt-bindings/gpio/gpio.h>.
+
+      When the remote cameras power is controlled by one of the MAX9286 gpio
+      lines, this property has to be used to specify which line among the two
+      available ones controls the remote camera power enablement.
+
+      When this property is used it is not possible to register a gpio
+      controller as the gpio lines are controlled directly by the MAX9286 and
+      not available for consumers, nor the 'poc-supply' property should be
+      specified.
+
   ports:
     $ref: /schemas/graph.yaml#/properties/ports
 
@@ -182,7 +204,16 @@ required:
   - reg
   - ports
   - i2c-mux
-  - gpio-controller
+
+# If 'maxim,gpio-poc' is present, then 'poc-supply' and 'gpio-controller'
+# are not allowed.
+if:
+  required:
+    - maxim,gpio-poc
+then:
+  properties:
+    poc-supply: false
+    gpio-controller: false
 
 additionalProperties: false
 
@@ -327,4 +358,38 @@ examples:
                 };
             };
         };
+
+        /*
+        * Example of a deserializer that controls the camera Power over Coax
+        * through one of its gpio lines.
+        */
+        gmsl-deserializer@6c {
+            compatible = "maxim,max9286";
+            reg = <0x6c>;
+            enable-gpios = <&gpio 14 GPIO_ACTIVE_HIGH>;
+
+            /*
+            * The remote camera power is controlled by MAX9286 GPIO line #0.
+            * No 'poc-supply' nor 'gpio-controller' are specified.
+            */
+            maxim,gpio-poc = <0 GPIO_ACTIVE_LOW>;
+
+            /*
+            * Do not describe connections as they're the same as in the previous
+            * example.
+            */
+            ports {
+                #address-cells = <1>;
+                #size-cells = <0>;
+
+                port@4 {
+                    reg = <4>;
+                };
+            };
+
+            i2c-mux {
+                #address-cells = <1>;
+                #size-cells = <0>;
+            };
+        };
     };
-- 
2.32.0


  parent reply	other threads:[~2021-07-22  9:12 UTC|newest]

Thread overview: 9+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-07-22  9:12 [PATCH v6 0/8] arm64: dts: renesas: Enable GMSL on Eagle and Condor Jacopo Mondi
2021-07-22  9:12 ` [PATCH v6 1/8] dt-bindings: media: max9286: Re-indent example Jacopo Mondi
2021-07-22  9:12 ` Jacopo Mondi [this message]
2021-07-22  9:12 ` [PATCH v6 3/8] media: i2c: max9286: Use "maxim,gpio-poc" property Jacopo Mondi
2021-07-22  9:12 ` [PATCH v6 4/8] media: i2c: rdacm20: Re-program chip address earlier Jacopo Mondi
2021-07-22  9:12 ` [PATCH v6 5/8] arm64: dts: renesas: condor: Enable MAX9286 Jacopo Mondi
2021-07-22  9:12 ` [PATCH v6 6/8] arm64: dts: renesas: eagle: " Jacopo Mondi
2021-07-22  9:12 ` [PATCH v6 7/8] arm64: dts: renesas: Add GMSL cameras .dtsi Jacopo Mondi
2021-07-22  9:12 ` [PATCH v6 8/8] DNI: arm64: dts: renesas: eagle: Include eagle-gmsl Jacopo Mondi

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