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From:   Chris Packham <chris.packham@alliedtelesis.co.nz>
To:     gregory.clement@bootlin.com, andi.shyti@kernel.org,
        robh+dt@kernel.org, krzysztof.kozlowski+dt@linaro.org,
        conor+dt@kernel.org
Cc:     linux-i2c@vger.kernel.org, devicetree@vger.kernel.org,
        linux-kernel@vger.kernel.org,
        Chris Packham <chris.packham@alliedtelesis.co.nz>
Subject: [PATCH v4 1/2] dt-bindings: i2c: mv64xxx: add reset-gpios property
Date:   Wed, 25 Oct 2023 11:30:31 +1300
Message-ID: <20231024223032.3387487-2-chris.packham@alliedtelesis.co.nz>
In-Reply-To: <20231024223032.3387487-1-chris.packham@alliedtelesis.co.nz>
References: <20231024223032.3387487-1-chris.packham@alliedtelesis.co.nz>
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Add reset-gpios and 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@alliedtelesis.co.nz>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
---

Notes:
    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.ya=
ml b/Documentation/devicetree/bindings/i2c/marvell,mv64xxx-i2c.yaml
index 461d1c9ee3f7..ecf5b279cfa4 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
=20
+  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 p=
robed.
+    maxItems: 1
+
+  reset-duration-us:
+    description: Reset duration in us.
+    default: 1
+
   dmas:
     items:
       - description: RX DMA Channel
--=20
2.42.0