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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>,
        Rob Herring <robh+dt@kernel.org>
Cc:     Jacopo Mondi <jacopo+renesas@jmondi.org>,
        linux-renesas-soc@vger.kernel.org, devicetree@vger.kernel.org,
        linux-kernel@vger.kernel.org
Subject: [PATCH 1/4] dt-bindings: media: max9286: Describe gpio-hog
Date:   Mon, 15 Feb 2021 18:24:44 +0100
Message-Id: <20210215172447.2026514-2-jacopo+renesas@jmondi.org>
In-Reply-To: <20210215172447.2026514-1-jacopo+renesas@jmondi.org>
References: <20210215172447.2026514-1-jacopo+renesas@jmondi.org>
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The MAX9286 GMSL deserializer features gpio controller capabilities,
as it provides 2 GPIO lines.

As establishing a regulator that uses one of the GPIO lines and
enabling/disabling it at run-time in the max9286 won't work due to
a circular dependency on the gpio-controller/regulator creation, allow
the usage of a gpio-hog for that purpose.

The usage of the gpio-hog is required in designs where the MAX9286
GPIO lines control the remote cameras power.

Signed-off-by: Jacopo Mondi <jacopo+renesas@jmondi.org>
---
 .../devicetree/bindings/media/i2c/maxim,max9286.yaml     | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/Documentation/devicetree/bindings/media/i2c/maxim,max9286.yaml b/Documentation/devicetree/bindings/media/i2c/maxim,max9286.yaml
index ee16102fdfe7..9d5ecfd2397c 100644
--- a/Documentation/devicetree/bindings/media/i2c/maxim,max9286.yaml
+++ b/Documentation/devicetree/bindings/media/i2c/maxim,max9286.yaml
@@ -50,6 +50,15 @@ properties:
   '#gpio-cells':
     const: 2
 
+  camvdd_en:
+    type: object
+    properties:
+      gpio-hog: true
+      gpios: true
+      output-low: true
+      line-name:
+        const: "CAMVDD_EN"
+
   maxim,reverse-channel-microvolt:
     minimum: 30000
     maximum: 200000
-- 
2.30.0