linux-kernel - [PATCH v2] dt-bindings: iio: afe: voltage-divider: Add io-channel-cells

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Date: Tue, 30 Jan 2024 16:48:29 +0530
From: Naresh Solanki <naresh.solanki@...ements.com>
To: Peter Rosin <peda@...ntia.se>,
	Jonathan Cameron <jic23@...nel.org>,
	Lars-Peter Clausen <lars@...afoo.de>,
	Rob Herring <robh+dt@...nel.org>,
	Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
	Conor Dooley <conor+dt@...nel.org>
Cc: mazziesaccount@...il.com,
	Naresh Solanki <naresh.solanki@...ements.com>,
	linux-iio@...r.kernel.org,
	devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH v2] dt-bindings: iio: afe: voltage-divider: Add io-channel-cells

voltage-divider is always an iio consumer at the same time it is
optionally an iio provider.
Hence add #io-channel-cells
Also update example.

Signed-off-by: Naresh Solanki <naresh.solanki@...ements.com>
---
 .../bindings/iio/afe/voltage-divider.yaml          | 14 +++++++++++++-
 1 file changed, 13 insertions(+), 1 deletion(-)

diff --git a/Documentation/devicetree/bindings/iio/afe/voltage-divider.yaml b/Documentation/devicetree/bindings/iio/afe/voltage-divider.yaml
index dddf97b50549..09f10d7c4e02 100644
--- a/Documentation/devicetree/bindings/iio/afe/voltage-divider.yaml
+++ b/Documentation/devicetree/bindings/iio/afe/voltage-divider.yaml
@@ -39,6 +39,13 @@ properties:
     description: |
       Channel node of a voltage io-channel.
 
+  '#io-channel-cells':
+    description:
+      In addition to consuming the measurement services of an ADC,
+      the voltage divider can act as an provider of measurement
+      services to other devices.
+    const: 1
+
   output-ohms:
     description:
       Resistance Rout over which the output voltage is measured. See full-ohms.
@@ -75,12 +82,17 @@ examples:
             spi-max-frequency = <1000000>;
         };
     };
-    sysv {
+    p12v_vd: sysv {
         compatible = "voltage-divider";
         io-channels = <&maxadc 1>;
+        #io-channel-cells = <1>;
 
         /* Scale the system voltage by 22/222 to fit the ADC range. */
         output-ohms = <22>;
         full-ohms = <222>; /* 200 + 22 */
     };
+    iio-hwmon {
+        compatible = "iio-hwmon";
+        io-channels = <&p12v_vd 0>;
+    };
 ...

base-commit: 861c0981648f5b64c86fd028ee622096eb7af05a
-- 
2.42.0