linux-kernel - [PATCH 2/2] arm64: dts: set the default i2c pin drive strength to 16mA

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [day] [month] [year] [list]

Message-Id: <1449857592-11530-1-git-send-email-srinivas.kandagatla@linaro.org>
Date:	Fri, 11 Dec 2015 18:13:12 +0000
From:	Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
To:	andy.gross@...aro.org, linux-arm-msm@...r.kernel.org
Cc:	linux-arm-kernel@...ts.infradead.org, devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
Subject: [PATCH 2/2] arm64: dts: set the default i2c pin drive strength to 16mA

2mA drive strength is not enough when we connect multiple i2c devices
on the bus with different pull up resistors.

This issue was detected when multiple i2c devices connected on the other side
of level shifters on Linaro sensor board. Maxing up to 16mA made i2c much stable.

Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
---
 arch/arm64/boot/dts/qcom/msm8916-pins.dtsi | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/arch/arm64/boot/dts/qcom/msm8916-pins.dtsi b/arch/arm64/boot/dts/qcom/msm8916-pins.dtsi
index 49ec55a..1991af7 100644
--- a/arch/arm64/boot/dts/qcom/msm8916-pins.dtsi
+++ b/arch/arm64/boot/dts/qcom/msm8916-pins.dtsi
@@ -272,7 +272,7 @@
 		};
 		pinconf {
 			pins = "gpio6", "gpio7";
-			drive-strength = <2>;
+			drive-strength = <16>;
 			bias-disable = <0>;
 		};
 	};
@@ -296,7 +296,7 @@
 		};
 		pinconf {
 			pins = "gpio14", "gpio15";
-			drive-strength = <2>;
+			drive-strength = <16>;
 			bias-disable = <0>;
 		};
 	};
@@ -320,7 +320,7 @@
 		};
 		pinconf {
 			pins = "gpio22", "gpio23";
-			drive-strength = <2>;
+			drive-strength = <16>;
 			bias-disable = <0>;
 		};
 	};
-- 
1.9.1

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/