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

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Message-ID: <20240201044623.374389-1-aahila@google.com>
Date: Thu,  1 Feb 2024 04:46:22 +0000
From: Aahil Awatramani <aahila@...gle.com>
To: Aahil Awatramani <aahila@...gle.com>, David Dillow <dillow@...gle.com>, 
	Wolfram Sang <wsa+renesas@...g-engineering.com>, Andi Shyti <andi.shyti@...nel.org>, 
	Rob Herring <robh+dt@...nel.org>, 
	Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>, Conor Dooley <conor+dt@...nel.org>, 
	Jarkko Nikula <jarkko.nikula@...ux.intel.com>, 
	Andy Shevchenko <andriy.shevchenko@...ux.intel.com>, 
	Mika Westerberg <mika.westerberg@...ux.intel.com>, Jan Dabros <jsd@...ihalf.com>, 
	linux-i2c@...r.kernel.org, devicetree@...r.kernel.org, 
	linux-kernel@...r.kernel.org
Subject: [PATCH 1/2] dt-bindings: i2c: designware: allow fine tuning tuning
 waveform from device tree

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@...gle.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