linux-kernel - [PATCH v2 1/2] dt-bindings: iio: ad74413r: allow setting sink current for digital input

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Date:   Mon,  6 Mar 2023 10:43:00 +0100
From:   Rasmus Villemoes <linux@...musvillemoes.dk>
To:     Cosmin Tanislav <cosmin.tanislav@...log.com>,
        Lars-Peter Clausen <lars@...afoo.de>,
        Michael Hennerich <Michael.Hennerich@...log.com>,
        Jonathan Cameron <jic23@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>
Cc:     devicetree@...r.kernel.org,
        Rasmus Villemoes <linux@...musvillemoes.dk>,
        linux-iio@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH v2 1/2] dt-bindings: iio: ad74413r: allow setting sink current for digital input

Depending on the actual hardware wired up to a digital input channel,
it may be necessary to configure the ad74413r to sink a small
current. For example, in the case of a simple mechanical switch, the
charge on the external 68 nF capacitor (cf. the data sheet's Figure
34) will keep the channel as reading high even after the switch is
turned off again.

Signed-off-by: Rasmus Villemoes <linux@...musvillemoes.dk>
---
 .../devicetree/bindings/iio/addac/adi,ad74413r.yaml      | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/Documentation/devicetree/bindings/iio/addac/adi,ad74413r.yaml b/Documentation/devicetree/bindings/iio/addac/adi,ad74413r.yaml
index 9eb3ecc8bbc8..590ea7936ad7 100644
--- a/Documentation/devicetree/bindings/iio/addac/adi,ad74413r.yaml
+++ b/Documentation/devicetree/bindings/iio/addac/adi,ad74413r.yaml
@@ -101,6 +101,15 @@ patternProperties:
           When not configured as a comparator, the GPO will be treated as an
           output-only GPIO.
 
+      drive-strength-microamp:
+        description: |
+          For channels configured as digital input, this configures the sink
+          current.
+        minimum: 0
+        maximum: 1800
+        default: 0
+        multipleOf: 120
+
     required:
       - reg
 
-- 
2.37.2