linux-kernel - [PATCH] arm64: dts: amlogic: gxl: set i2c bias to pull-up

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Message-Id: <20250425203118.1444481-1-da@libre.computer>
Date: Fri, 25 Apr 2025 16:31:18 -0400
From: Da Xue <da@...re.computer>
To: Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Neil Armstrong <neil.armstrong@...aro.org>,
	Kevin Hilman <khilman@...libre.com>,
	Jerome Brunet <jbrunet@...libre.com>,
	Martin Blumenstingl <martin.blumenstingl@...glemail.com>
Cc: devicetree@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	linux-amlogic@...ts.infradead.org,
	linux-kernel@...r.kernel.org,
	Da Xue <da@...re.computer>
Subject: [PATCH] arm64: dts: amlogic: gxl: set i2c bias to pull-up

GXL I2C pins need internal pull-up enabled to operate if there
is no external resistor. The pull-up is 60kohms per the datasheet.

We should set the bias when i2c pinmux is enabled.

Signed-off-by: Da Xue <da@...re.computer>
---
 arch/arm64/boot/dts/amlogic/meson-gxl.dtsi | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/arch/arm64/boot/dts/amlogic/meson-gxl.dtsi b/arch/arm64/boot/dts/amlogic/meson-gxl.dtsi
index 2dc2fdaecf9f..aed8dbfbb64d 100644
--- a/arch/arm64/boot/dts/amlogic/meson-gxl.dtsi
+++ b/arch/arm64/boot/dts/amlogic/meson-gxl.dtsi
@@ -214,7 +214,7 @@ mux {
 				groups = "i2c_sck_ao",
 				       "i2c_sda_ao";
 				function = "i2c_ao";
-				bias-disable;
+				bias-pull-up;
 			};
 		};
 
@@ -576,7 +576,7 @@ mux {
 				groups = "i2c_sck_a",
 				     "i2c_sda_a";
 				function = "i2c_a";
-				bias-disable;
+				bias-pull-up;
 			};
 		};
 
@@ -585,7 +585,7 @@ mux {
 				groups = "i2c_sck_b",
 				      "i2c_sda_b";
 				function = "i2c_b";
-				bias-disable;
+				bias-pull-up;
 			};
 		};
 
@@ -594,7 +594,7 @@ mux {
 				groups = "i2c_sck_c",
 				      "i2c_sda_c";
 				function = "i2c_c";
-				bias-disable;
+				bias-pull-up;
 			};
 		};
 
@@ -603,7 +603,7 @@ mux {
 				groups = "i2c_sck_c_dv19",
 				      "i2c_sda_c_dv18";
 				function = "i2c_c";
-				bias-disable;
+				bias-pull-up;
 			};
 		};
 
-- 
2.39.5