[PATCH 1/2] dt-bindings: i2c: designware: allow fine tuning tuning waveform from device tree

Aahil Awatramani
2024-02-01T04:46:46Z

The Synopsys i2c driver allows a user to override the parameters
controlling the waveform using ACPI; this is useful for fine tuning when
needed to make spec compliance. Extend this support to the device tree to
allow non-ACPI platforms the same capabilities.

Signed-off-by: Aahil Awatramani <aahila@google.com>
---
Documentation/devicetree/bindings/i2c/i2c.txt | 18 ++++++++++++++++++
1 file changed, 18 insertions(+)

diff --git a/Documentation/devicetree/bindings/i2c/i2c.txt b/Documentation/devicetree/bindings/i2c/i2c.txt
index fc3dd7ec0445..3c33c36571f9 100644
--- a/Documentation/devicetree/bindings/i2c/i2c.txt
+++ b/Documentation/devicetree/bindings/i2c/i2c.txt
@@ -45,6 +45,24 @@ wants to support one of the below features, it should adapt these bindings.
Number of nanoseconds the SCL signal takes to rise; t(r) in the I2C
specification.

+- i2c-scl-ss-hcnt
+ HCNT value for standard speed mode in I2C Controller.
+
+- i2c-scl-ss-lcnt
+ LCNT value for standard speed mode in I2C Controller.
+
+- i2c-scl-fs-hcnt
+ HCNT value for fast speed mode in I2C Controller.
+
+- i2c-scl-fs-lcnt
+ LCNT value for fast speed mode in I2C Controller.
+
+- i2c-scl-hs-hcnt
+ HCNT value for high speed mode in I2C Controller.
+
+- i2c-scl-hs-lcnt
+ LCNT value for high speed mode in I2C Controller.
+
- i2c-sda-falling-time-ns
Number of nanoseconds the SDA signal takes to fall; t(f) in the I2C
specification.
--
2.43.0.429.g432eaa2c6b-goog