linux-kernel - [PATCH] ARM: dts: at91-sama5d2_icp.dts: Added I2C bus recovery support

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Message-ID: <20210921064344.889304-1-durai.manickamkr@microchip.com>
Date:   Tue, 21 Sep 2021 12:13:44 +0530
From:   Durai Manickam KR <durai.manickamkr@...rochip.com>
To:     <robh+dt@...nel.org>, <nicolas.ferre@...rochip.com>,
        <alexandre.belloni@...tlin.com>, <ludovic.desroches@...rochip.com>,
        <devicetree@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>, <Hari.PrasathGE@...rochip.com>
CC:     Durai Manickam KR <durai.manickamkr@...rochip.com>
Subject: [PATCH] ARM: dts: at91-sama5d2_icp.dts: Added I2C bus recovery support

SDA and SCL is configured as GPIO for I2C bus to recover during
I2C bus malfunction.

Signed-off-by: Durai Manickam KR <durai.manickamkr@...rochip.com>
---
 arch/arm/boot/dts/at91-sama5d2_icp.dts | 22 ++++++++++++++++++++--
 1 file changed, 20 insertions(+), 2 deletions(-)

diff --git a/arch/arm/boot/dts/at91-sama5d2_icp.dts b/arch/arm/boot/dts/at91-sama5d2_icp.dts
index e06b58724ca8..806eb1d911d7 100644
--- a/arch/arm/boot/dts/at91-sama5d2_icp.dts
+++ b/arch/arm/boot/dts/at91-sama5d2_icp.dts
@@ -307,8 +307,11 @@ regulator-state-mem {
 };
 
 &i2c0 { /* mikrobus i2c */
-	pinctrl-names = "default";
+	pinctrl-names = "default", "gpio";
 	pinctrl-0 = <&pinctrl_mikrobus_i2c>;
+	pinctrl-1 = <&pinctrl_i2c0_gpio>;
+	sda-gpios = <&pioA PIN_PD21 GPIO_ACTIVE_HIGH>;
+	scl-gpios = <&pioA PIN_PD22 (GPIO_ACTIVE_HIGH | GPIO_OPEN_DRAIN)>;
 	i2c-digital-filter;
 	i2c-digital-filter-width-ns = <35>;
 	status = "okay";
@@ -316,8 +319,11 @@ &i2c0 { /* mikrobus i2c */
 
 &i2c1 {
 	dmas = <0>, <0>;
-	pinctrl-names = "default";
+	pinctrl-names = "default", "gpio";
 	pinctrl-0 = <&pinctrl_i2c1_default>;
+	pinctrl-1 = <&pinctrl_i2c1_gpio>;
+	sda-gpios = <&pioA PIN_PD19 GPIO_ACTIVE_HIGH>;
+	scl-gpios = <&pioA PIN_PD20 (GPIO_ACTIVE_HIGH | GPIO_OPEN_DRAIN)>;
 	i2c-digital-filter;
 	i2c-digital-filter-width-ns = <35>;
 	status = "okay";
@@ -402,6 +408,12 @@ pinctrl_i2c1_default: i2c1_default {
 		bias-disable;
 	};
 
+	pinctrl_i2c1_gpio: i2c1_gpio {
+                pinmux = <PIN_PD19__GPIO>,
+                         <PIN_PD20__GPIO>;
+                bias-disable;
+        };
+
 	pinctrl_key_gpio_default: key_gpio_default {
 		pinmux = <PIN_PD0__GPIO>;
 		bias-pull-up;
@@ -463,6 +475,12 @@ pinctrl_mikrobus_i2c: mikrobus_i2c {
 		bias-disable;
 	};
 
+	pinctrl_i2c0_gpio: i2c0_gpio {
+		pinmux = <PIN_PD21__GPIO>,
+			 <PIN_PD22__GPIO>;
+		bias-disable;
+	};
+
 	pinctrl_mikrobus1_an: mikrobus1_an {
 		pinmux = <PIN_PD26__GPIO>;
 		bias-disable;
-- 
2.25.1