kernel: backport the I2C bus recovery for uDPU

Backport the I2C bus recovery DT configuration for the uDPU that has
been queued for 5.8.

Signed-off-by: Russell King <[email protected]>

target/linux/mvebu/patches-5.4/551-v5.8-arm64-dts-add-uDPU-i2c-bus-recovery.patch

@@ -0,0 +1,60 @@
+From: Russell King <[email protected]>
+Bcc: [email protected]
+Cc: Vladimir Vid <[email protected]>,Jason Cooper <[email protected]>,Andrew Lunn <[email protected]>,Gregory Clement <[email protected]>,Sebastian Hesselbarth <[email protected]>,Rob Herring <[email protected]>,Mark Rutland <[email protected]>,[email protected],[email protected]
+Subject: [PATCH] arm64: dts: add uDPU i2c bus recovery
+MIME-Version: 1.0
+Content-Disposition: inline
+Content-Transfer-Encoding: 8bit
+Content-Type: text/plain; charset="utf-8"
+
+Signed-off-by: Russell King <[email protected]>
+---
+ .../boot/dts/marvell/armada-3720-uDPU.dts     | 22 +++++++++++++++++--
+ 1 file changed, 20 insertions(+), 2 deletions(-)
+
+diff --git a/arch/arm64/boot/dts/marvell/armada-3720-uDPU.dts b/arch/arm64/boot/dts/marvell/armada-3720-uDPU.dts
+index 7eb6c1796cef..95d46e8d081c 100644
+--- a/arch/arm64/boot/dts/marvell/armada-3720-uDPU.dts
++++ b/arch/arm64/boot/dts/marvell/armada-3720-uDPU.dts
+@@ -117,18 +117,36 @@
+ 	};
+ };
+ 
++&pinctrl_nb {
++	i2c1_recovery_pins: i2c1-recovery-pins {
++		groups = "i2c1";
++		function = "gpio";
++	};
++
++	i2c2_recovery_pins: i2c2-recovery-pins {
++		groups = "i2c2";
++		function = "gpio";
++	};
++};
++
+ &i2c0 {
+ 	status = "okay";
+-	pinctrl-names = "default";
++	pinctrl-names = "default", "recovery";
+ 	pinctrl-0 = <&i2c1_pins>;
++	pinctrl-1 = <&i2c1_recovery_pins>;
+ 	/delete-property/mrvl,i2c-fast-mode;
++	scl-gpios = <&gpionb 0 (GPIO_ACTIVE_HIGH | GPIO_OPEN_DRAIN)>;
++	sda-gpios = <&gpionb 1 (GPIO_ACTIVE_HIGH | GPIO_OPEN_DRAIN)>;
+ };
+ 
+ &i2c1 {
+ 	status = "okay";
+-	pinctrl-names = "default";
++	pinctrl-names = "default", "recovery";
+ 	pinctrl-0 = <&i2c2_pins>;
++	pinctrl-1 = <&i2c2_recovery_pins>;
+ 	/delete-property/mrvl,i2c-fast-mode;
++	scl-gpios = <&gpionb 2 (GPIO_ACTIVE_HIGH | GPIO_OPEN_DRAIN)>;
++	sda-gpios = <&gpionb 3 (GPIO_ACTIVE_HIGH | GPIO_OPEN_DRAIN)>;
+ 
+ 	lm75@48 {
+ 		status = "okay";
+-- 
+2.20.1
+