linux-kernel - [PATCH 6/6] arm64: dts: qcom: msm8916-samsung-a2015: Disable muic i2c pin bias

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Date:   Fri, 13 Nov 2020 22:59:17 +0500
From:   nikitos.tr@...il.com
To:     agross@...nel.org, bjorn.andersson@...aro.org
Cc:     robh+dt@...nel.org, stephan@...hold.net, Michael.Srba@...nam.cz,
        linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, phone-devel@...r.kernel.org,
        ~postmarketos/upstreaming@...ts.sr.ht,
        Nikita Travkin <nikitos.tr@...il.com>
Subject: [PATCH 6/6] arm64: dts: qcom: msm8916-samsung-a2015: Disable muic i2c pin bias

From: Nikita Travkin <nikitos.tr@...il.com>

Some versions of the firmware leave i2c gpios in a wrong state.
Add pinctrl that disables pin bias since external pull-up resistors
are present.

Fixes: 1329c1ab0730 ("arm64: dts: qcom: Add device tree for Samsung Galaxy A3U/A5U")
Signed-off-by: Nikita Travkin <nikitos.tr@...il.com>
---
 .../boot/dts/qcom/msm8916-samsung-a2015-common.dtsi   | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/arch/arm64/boot/dts/qcom/msm8916-samsung-a2015-common.dtsi b/arch/arm64/boot/dts/qcom/msm8916-samsung-a2015-common.dtsi
index 0b0dfd3059de..f91269492d72 100644
--- a/arch/arm64/boot/dts/qcom/msm8916-samsung-a2015-common.dtsi
+++ b/arch/arm64/boot/dts/qcom/msm8916-samsung-a2015-common.dtsi
@@ -78,6 +78,9 @@ i2c-muic {
 		sda-gpios = <&msmgpio 105 (GPIO_ACTIVE_HIGH|GPIO_OPEN_DRAIN)>;
 		scl-gpios = <&msmgpio 106 (GPIO_ACTIVE_HIGH|GPIO_OPEN_DRAIN)>;
 
+		pinctrl-names = "default";
+		pinctrl-0 = <&muic_i2c_default>;
+
 		#address-cells = <1>;
 		#size-cells = <0>;
 
@@ -304,6 +307,14 @@ mdss_sleep: mdss-sleep {
 		};
 	};
 
+	muic_i2c_default: muic-i2c-default {
+		pins = "gpio105", "gpio106";
+		function = "gpio";
+
+		drive-strength = <2>;
+		bias-disable;
+	};
+
 	muic_int_default: muic-int-default {
 		pins = "gpio12";
 		function = "gpio";
-- 
2.25.1