[PATCH 1/2] dt-bindings: i2c: qcom-cci: Document qcom,scl-stretch-enable property

[Cory Keitz via B4 Relay <devnull+ckeitz.amazon.com@kernel.org>]

From: Cory Keitz <ckeitz@amazon.com>

Add the optional boolean property "qcom,scl-stretch-enable" to the
CCI i2c-bus sub-nodes. This property enables SCL clock stretching on
the corresponding CCI master, which is needed by peripherals such as
GMSL deserializers that hold SCL low to absorb forwarding latency.

Signed-off-by: Cory Keitz <ckeitz@amazon.com>
---
 Documentation/devicetree/bindings/i2c/qcom,i2c-cci.yaml | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/Documentation/devicetree/bindings/i2c/qcom,i2c-cci.yaml b/Documentation/devicetree/bindings/i2c/qcom,i2c-cci.yaml
index 399a09409e07..fea609fa2f05 100644
--- a/Documentation/devicetree/bindings/i2c/qcom,i2c-cci.yaml
+++ b/Documentation/devicetree/bindings/i2c/qcom,i2c-cci.yaml
@@ -78,6 +78,14 @@ patternProperties:
       clock-frequency:
         default: 100000
 
+      qcom,scl-stretch-enable:
+        type: boolean
+        description:
+          Enable SCL clock stretching on this CCI master. When set, the
+          CCI hardware will assert the SCL stretch enable bit in the
+          MISC_CTL register, allowing peripherals to hold SCL low to
+          throttle the bus.
+
 required:
   - compatible
   - clock-names

-- 
2.47.3