linux-kernel - [PATCH v4 3/7] [media] ad5820: DT new optional field enable-gpios

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Message-Id: <20180920204751.29117-3-ricardo.ribalda@gmail.com>
Date:   Thu, 20 Sep 2018 22:47:47 +0200
From:   Ricardo Ribalda Delgado <ricardo.ribalda@...il.com>
To:     Pavel Machek <pavel@....cz>, Sakari Ailus <sakari.ailus@....fi>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        linux-media@...r.kernel.org, linux-kernel@...r.kernel.org,
        Hans Verkuil <hans.verkuil@...co.com>,
        Laurent Pinchart <laurent.pinchart@...asonboard.com>
Cc:     Ricardo Ribalda Delgado <ricardo.ribalda@...il.com>,
        devicetree@...r.kernel.org
Subject: [PATCH v4 3/7] [media] ad5820: DT new optional field enable-gpios

Document new enable-gpio field. It can be used to disable the part
without turning down its regulator.

Cc: devicetree@...r.kernel.org
Signed-off-by: Ricardo Ribalda Delgado <ricardo.ribalda@...il.com>
Acked-by: Pavel Machek <pavel@....cz>
---
 Documentation/devicetree/bindings/media/i2c/ad5820.txt | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/Documentation/devicetree/bindings/media/i2c/ad5820.txt b/Documentation/devicetree/bindings/media/i2c/ad5820.txt
index 5940ca11c021..9ccd96d3d5f0 100644
--- a/Documentation/devicetree/bindings/media/i2c/ad5820.txt
+++ b/Documentation/devicetree/bindings/media/i2c/ad5820.txt
@@ -8,6 +8,12 @@ Required Properties:
 
   - VANA-supply: supply of voltage for VANA pin
 
+Optional properties:
+
+   - enable-gpios : GPIO spec for the XSHUTDOWN pin. Note that the polarity of
+the enable GPIO is the opposite of the XSHUTDOWN pin (asserting the enable
+GPIO deasserts the XSHUTDOWN signal and vice versa).
+
 Example:
 
        ad5820: coil@c {
@@ -15,5 +21,6 @@ Example:
                reg = <0x0c>;
 
                VANA-supply = <&vaux4>;
+               enable-gpios = <&msmgpio 26 GPIO_ACTIVE_HIGH>;
        };
 
-- 
2.18.0