[RESEND PATCH v5 1/2] dt-bindings: i2c: pca954x: Add custom properties for MAX7357

Naresh Solanki
2024-01-30T12:19:19Z

From: Patrick Rudolph <patrick.rudolph@9elements.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@9elements.com>
Signed-off-by: Naresh Solanki <naresh.solanki@9elements.com>
Reviewed-by: Rob Herring <robh@kernel.org>
---
Changes in V5:
- Append Reviewer-by
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: 41bccc98fb7931d63d03f326a746ac4d429c1dd3
--
2.42.0