[PATCH v2] arm64: dts: exynosautov9: convert serial_0 for USI

[Chanho Park]

According to USI v2 driver change[1], serial_0 node should be converted to
use the USI node hierarchy. syscon_peric0 will be used as a syscon node
to control the USI00_USI_SW_CONF register.
This also changes the serial node name from uart@ to serial at .

[1]: https://lore.kernel.org/linux-samsung-soc/20211204195757.8600-2-semen.protsenko@linaro.org/

Cc: Sam Protsenko <semen.protsenko at linaro.org>
Signed-off-by: Chanho Park <chanho61.park at samsung.com>
---
Change from v1:
- Put usi_0 node alphabetically in sadk.dts

 .../boot/dts/exynos/exynosautov9-sadk.dts     |  4 +++
 arch/arm64/boot/dts/exynos/exynosautov9.dtsi  | 36 ++++++++++++++-----
 2 files changed, 32 insertions(+), 8 deletions(-)

diff --git a/arch/arm64/boot/dts/exynos/exynosautov9-sadk.dts b/arch/arm64/boot/dts/exynos/exynosautov9-sadk.dts
index ef46d7aa6e28..57518cb5e8c4 100644
--- a/arch/arm64/boot/dts/exynos/exynosautov9-sadk.dts
+++ b/arch/arm64/boot/dts/exynos/exynosautov9-sadk.dts
@@ -54,3 +54,7 @@ &ufs_0 {
 	vcc-supply = <&ufs_0_fixed_vcc_reg>;
 	vcc-fixed-regulator;
 };
+
+&usi_0 {
+	status = "okay";
+};
diff --git a/arch/arm64/boot/dts/exynos/exynosautov9.dtsi b/arch/arm64/boot/dts/exynos/exynosautov9.dtsi
index a960c0bc2dba..de8fcb82eaec 100644
--- a/arch/arm64/boot/dts/exynos/exynosautov9.dtsi
+++ b/arch/arm64/boot/dts/exynos/exynosautov9.dtsi
@@ -7,6 +7,7 @@
  */
 
 #include <dt-bindings/interrupt-controller/arm-gic.h>
+#include <dt-bindings/soc/samsung,exynos-usi.h>
 
 / {
 	compatible = "samsung,exynosautov9";
@@ -256,16 +257,35 @@ syscon_fsys2: syscon at 17c20000 {
 			reg = <0x17c20000 0x1000>;
 		};
 
-		/* USI: UART */
-		serial_0: uart at 10300000 {
-			compatible = "samsung,exynos850-uart";
-			reg = <0x10300000 0x100>;
-			interrupts = <GIC_SPI 345 IRQ_TYPE_LEVEL_HIGH>;
-			pinctrl-names = "default";
-			pinctrl-0 = <&uart0_bus_dual>;
+		syscon_peric0: syscon at 10220000 {
+			compatible = "samsung,exynosautov9-sysreg", "syscon";
+			reg = <0x10220000 0x2000>;
+		};
+
+		usi_0: usi at 103000c0 {
+			compatible = "samsung,exynos850-usi";
+			reg = <0x103000c0 0x20>;
+			samsung,sysreg = <&syscon_peric0 0x1000>;
+			samsung,mode = <USI_V2_UART>;
+			samsung,clkreq-on; /* needed for UART mode */
+			#address-cells = <1>;
+			#size-cells = <1>;
+			ranges;
 			clocks = <&uart_clock>, <&uart_clock>;
-			clock-names = "uart", "clk_uart_baud0";
+			clock-names = "pclk", "ipclk";
 			status = "disabled";
+
+			/* USI: UART */
+			serial_0: serial at 10300000 {
+				compatible = "samsung,exynos850-uart";
+				reg = <0x10300000 0xc0>;
+				interrupts = <GIC_SPI 345 IRQ_TYPE_LEVEL_HIGH>;
+				pinctrl-names = "default";
+				pinctrl-0 = <&uart0_bus_dual>;
+				clocks = <&uart_clock>, <&uart_clock>;
+				clock-names = "uart", "clk_uart_baud0";
+				status = "disabled";
+			};
 		};
 
 		ufs_0_phy: ufs0-phy at 17e04000 {
-- 
2.34.1