linux-kernel - [PATCH v4 1/2] dt-bindings: i2c: pca954x: Add custom properties for MAX7357

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Message-ID: <20231005134541.947727-1-naresh.solanki@9elements.com>
Date:   Thu,  5 Oct 2023 15:45:39 +0200
From:   Naresh Solanki <naresh.solanki@...ements.com>
To:     Peter Rosin <peda@...ntia.se>, Andi Shyti <andi.shyti@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Laurent Pinchart <laurent.pinchart@...asonboard.com>
Cc:     Patrick Rudolph <patrick.rudolph@...ements.com>,
        Naresh Solanki <naresh.solanki@...ements.com>,
        linux-i2c@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH v4 1/2] dt-bindings: i2c: pca954x: Add custom properties for MAX7357

From: Patrick Rudolph <patrick.rudolph@...ements.com>

Maxim Max7357 has a configuration register to enable additional
features. These features aren't enabled by default & its up to
board designer to enable the same as it may have unexpected side effects.

These should be validated for proper functioning & detection of devices
in secondary bus as sometimes it can cause secondary bus being disabled.

Add booleans for:
 - maxim,isolate-stuck-channel
 - maxim,send-flush-out-sequence
 - maxim,preconnection-wiggle-test-enable

Signed-off-by: Patrick Rudolph <patrick.rudolph@...ements.com>
Signed-off-by: Naresh Solanki <naresh.solanki@...ements.com>
---
Changes in V4:
- Drop max7358.
Changes in V3:
- Update commit message
Changes in V2:
- Update properties.
---
 .../bindings/i2c/i2c-mux-pca954x.yaml         | 30 +++++++++++++++++++
 1 file changed, 30 insertions(+)

diff --git a/Documentation/devicetree/bindings/i2c/i2c-mux-pca954x.yaml b/Documentation/devicetree/bindings/i2c/i2c-mux-pca954x.yaml
index 2d7bb998b0e9..9aa0585200c9 100644
--- a/Documentation/devicetree/bindings/i2c/i2c-mux-pca954x.yaml
+++ b/Documentation/devicetree/bindings/i2c/i2c-mux-pca954x.yaml
@@ -71,6 +71,23 @@ properties:
     description: A voltage regulator supplying power to the chip. On PCA9846
       the regulator supplies power to VDD2 (core logic) and optionally to VDD1.
 
+  maxim,isolate-stuck-channel:
+    type: boolean
+    description: Allows to use non faulty channels while a stuck channel is
+      isolated from the upstream bus. If not set all channels are isolated from
+      the upstream bus until the fault is cleared.
+
+  maxim,send-flush-out-sequence:
+    type: boolean
+    description: Send a flush-out sequence to stuck auxiliary buses
+      automatically after a stuck channel is being detected.
+
+  maxim,preconnection-wiggle-test-enable:
+    type: boolean
+    description: Send a STOP condition to the auxiliary buses when the switch
+      register activates a channel to detect a stuck high fault. On fault the
+      channel is isolated from the upstream bus.
+
 required:
   - compatible
   - reg
@@ -95,6 +112,19 @@ allOf:
         "#interrupt-cells": false
         interrupt-controller: false
 
+  - if:
+      not:
+        properties:
+          compatible:
+            contains:
+              enum:
+                - maxim,max7357
+    then:
+      properties:
+        maxim,isolate-stuck-channel: false
+        maxim,send-flush-out-sequence: false
+        maxim,preconnection-wiggle-test-enable: false
+
 unevaluatedProperties: false
 
 examples:

base-commit: b5d463c0eecb4a690e631fa38cb6771a906f7620
-- 
2.41.0