linux-kernel - [PATCH v5 1/2] dt-bindings: i2c: mv64xxx: add bus-reset-gpios property

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Message-ID: <20231027033104.1348921-2-chris.packham@alliedtelesis.co.nz>
Date:   Fri, 27 Oct 2023 16:31:03 +1300
From:   Chris Packham <chris.packham@...iedtelesis.co.nz>
To:     gregory.clement@...tlin.com, andi.shyti@...nel.org,
        robh+dt@...nel.org, krzysztof.kozlowski+dt@...aro.org,
        conor+dt@...nel.org
Cc:     linux-i2c@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Chris Packham <chris.packham@...iedtelesis.co.nz>
Subject: [PATCH v5 1/2] dt-bindings: i2c: mv64xxx: add bus-reset-gpios property

Add bus-reset-gpios and bus-reset-duration-us properties to the
marvell,mv64xxx-i2c binding. These can be used to describe hardware
where a common reset GPIO is connected to all downstream devices on and
I2C bus. This reset will be asserted then released before the downstream
devices on the bus are probed.

Signed-off-by: Chris Packham <chris.packham@...iedtelesis.co.nz>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
---

Notes:
    Changes in v5:
    - Rename reset-gpios and reset-duration-us to bus-reset-gpios and
      bus-reset-duration-us as requested by Wolfram
    Changes in v4:
    - Add r-by from Krzysztof
    Changes in v3:
    - Rename reset-delay-us to reset-duration-us to better reflect its
      purpose
    - Add default: for reset-duration-us
    - Add description: for reset-gpios
    Changes in v2:
    - Update commit message
    - Add reset-delay-us property

 .../devicetree/bindings/i2c/marvell,mv64xxx-i2c.yaml   | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/Documentation/devicetree/bindings/i2c/marvell,mv64xxx-i2c.yaml b/Documentation/devicetree/bindings/i2c/marvell,mv64xxx-i2c.yaml
index 461d1c9ee3f7..b165d1c4f0b1 100644
--- a/Documentation/devicetree/bindings/i2c/marvell,mv64xxx-i2c.yaml
+++ b/Documentation/devicetree/bindings/i2c/marvell,mv64xxx-i2c.yaml
@@ -70,6 +70,16 @@ properties:
   resets:
     maxItems: 1
 
+  bus-reset-gpios:
+    description:
+      GPIO pin providing a common reset for all downstream devices. This GPIO
+      will be asserted then released before the downstream devices are probed.
+    maxItems: 1
+
+  bus-reset-duration-us:
+    description: Reset duration in us.
+    default: 1
+
   dmas:
     items:
       - description: RX DMA Channel
-- 
2.42.0