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[v3,1/2] dt-bindings: i2c: pca954x: Add timeout reset property

Message ID DB6PR07MB35098D673A8DD04E56D9305D9D652@DB6PR07MB3509.eurprd07.prod.outlook.com
State New
Headers show
Series [v3,1/2] dt-bindings: i2c: pca954x: Add timeout reset property | expand

Commit Message

Wojciech Siudy (Nokia) Sept. 13, 2024, 6:50 a.m. UTC 
From: Wojciech Siudy <wojciech.siudy@nokia.com>

For cases when the mux shares reset line with other chips we cannot
use it when channel selection or deselection times out, because it
could break them without proper init/probe.

Signed-off-by: Wojciech Siudy <wojciech.siudy@nokia.com>
---
 .../devicetree/bindings/i2c/i2c-mux-pca954x.yaml          | 8 ++++++++
 1 file changed, 8 insertions(+)
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Patch

diff --git a/Documentation/devicetree/bindings/i2c/i2c-mux-pca954x.yaml b/Documentation/devicetree/bindings/i2c/i2c-mux-pca954x.yaml
index 9aa0585200c9..872be72da965 100644
--- a/Documentation/devicetree/bindings/i2c/i2c-mux-pca954x.yaml
+++ b/Documentation/devicetree/bindings/i2c/i2c-mux-pca954x.yaml
@@ -63,6 +63,12 @@  properties:
       necessary for example, if there are several multiplexers on the bus and
       the devices behind them use same I2C addresses.
 
+  i2c-mux-timeout-reset:
+    type: boolean
+    description: Sends reset pulse if channel selection or deselection times
+      out. Works only if reset GPIO provided. Do not use if other chips share
+      the same reset line.
+
   idle-state:
     description: if present, overrides i2c-mux-idle-disconnect
     $ref: /schemas/mux/mux-controller.yaml#/properties/idle-state
@@ -146,6 +152,8 @@  examples:
             interrupt-parent = <&ipic>;
             interrupts = <17 IRQ_TYPE_LEVEL_LOW>;
             interrupt-controller;
+            i2c-mux-idle-disconnect;
+            i2c-mux-timeout-reset;
             #interrupt-cells = <2>;
 
             i2c@2 {