[PATCH v1] arm64: dts: qcom: Enable CAN RX via GPIO expander

[Anup Kulkarni]

Few CAN controllers, part of RTSS sub-system on LeMans, route
their RX signal through a I2C GPIO expander at address 0x3b.
RTSS subsystem is an MCU like sub-system on LeMans with independent
booting capability through OSPI interface and supports peripherals like
RGMII, CAN-FD, UART, I2C, SPI etc.

Describe this hardware wiring by configuring the expander GPIO 4 pin as
hog with output-high, asserting the selected line during boot.

Signed-off-by: Anup Kulkarni <anup.kulkarni@xxxxxxxxxxxxxxxx>
---
 arch/arm64/boot/dts/qcom/lemans-evk.dts | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/arch/arm64/boot/dts/qcom/lemans-evk.dts b/arch/arm64/boot/dts/qcom/lemans-evk.dts
index a1ef4eba2a20..b8371bdf9933 100644
--- a/arch/arm64/boot/dts/qcom/lemans-evk.dts
+++ b/arch/arm64/boot/dts/qcom/lemans-evk.dts
@@ -615,6 +615,13 @@ expander3: gpio@3b {
 		interrupts-extended = <&tlmm 39 IRQ_TYPE_LEVEL_LOW>;
 		pinctrl-0 = <&expander3_int>;
 		pinctrl-names = "default";
+
+		rtss-can-sel-hog {
+			gpio-hog;
+			gpios = <4 GPIO_ACTIVE_HIGH>;
+			output-high;
+			line-name = "rtss-can-sel";
+		};
 	};
 
 	eeprom@50 {
-- 
2.34.1