riscv: dts: spacemit: Acquire clocks for UART

The K1 SoC features two clocks for UART controller, Acquire them
explicitly in the driver. Also it is required to remove the
clock-frequency properties from the uart node, otherwise the new
clock properties are ignored by of_platform_serial_setup() in "8250_of.c".

Reviewed-by: Alex Elder <[email protected]>
Reviewed-by: Haylen Chu <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Yixun Lan <[email protected]>

Author: dlan17

arch/riscv/boot/dts/spacemit/k1.dtsi

@@ -360,8 +360,10 @@
 		uart0: serial@d4017000 {
 			compatible = "spacemit,k1-uart", "intel,xscale-uart";
 			reg = <0x0 0xd4017000 0x0 0x100>;
+			clocks = <&syscon_apbc CLK_UART0>,
+				 <&syscon_apbc CLK_UART0_BUS>;
+			clock-names = "core", "bus";
 			interrupts = <42>;
-			clock-frequency = <14857000>;
 			reg-shift = <2>;
 			reg-io-width = <4>;
 			status = "disabled";
@@ -370,8 +372,10 @@
 		uart2: serial@d4017100 {
 			compatible = "spacemit,k1-uart", "intel,xscale-uart";
 			reg = <0x0 0xd4017100 0x0 0x100>;
+			clocks = <&syscon_apbc CLK_UART2>,
+				 <&syscon_apbc CLK_UART2_BUS>;
+			clock-names = "core", "bus";
 			interrupts = <44>;
-			clock-frequency = <14857000>;
 			reg-shift = <2>;
 			reg-io-width = <4>;
 			status = "disabled";
@@ -380,8 +384,10 @@
 		uart3: serial@d4017200 {
 			compatible = "spacemit,k1-uart", "intel,xscale-uart";
 			reg = <0x0 0xd4017200 0x0 0x100>;
+			clocks = <&syscon_apbc CLK_UART3>,
+				 <&syscon_apbc CLK_UART3_BUS>;
+			clock-names = "core", "bus";
 			interrupts = <45>;
-			clock-frequency = <14857000>;
 			reg-shift = <2>;
 			reg-io-width = <4>;
 			status = "disabled";
@@ -390,8 +396,10 @@
 		uart4: serial@d4017300 {
 			compatible = "spacemit,k1-uart", "intel,xscale-uart";
 			reg = <0x0 0xd4017300 0x0 0x100>;
+			clocks = <&syscon_apbc CLK_UART4>,
+				 <&syscon_apbc CLK_UART4_BUS>;
+			clock-names = "core", "bus";
 			interrupts = <46>;
-			clock-frequency = <14857000>;
 			reg-shift = <2>;
 			reg-io-width = <4>;
 			status = "disabled";
@@ -400,8 +408,10 @@
 		uart5: serial@d4017400 {
 			compatible = "spacemit,k1-uart", "intel,xscale-uart";
 			reg = <0x0 0xd4017400 0x0 0x100>;
+			clocks = <&syscon_apbc CLK_UART5>,
+				 <&syscon_apbc CLK_UART5_BUS>;
+			clock-names = "core", "bus";
 			interrupts = <47>;
-			clock-frequency = <14857000>;
 			reg-shift = <2>;
 			reg-io-width = <4>;
 			status = "disabled";
@@ -410,8 +420,10 @@
 		uart6: serial@d4017500 {
 			compatible = "spacemit,k1-uart", "intel,xscale-uart";
 			reg = <0x0 0xd4017500 0x0 0x100>;
+			clocks = <&syscon_apbc CLK_UART6>,
+				 <&syscon_apbc CLK_UART6_BUS>;
+			clock-names = "core", "bus";
 			interrupts = <48>;
-			clock-frequency = <14857000>;
 			reg-shift = <2>;
 			reg-io-width = <4>;
 			status = "disabled";
@@ -420,8 +432,10 @@
 		uart7: serial@d4017600 {
 			compatible = "spacemit,k1-uart", "intel,xscale-uart";
 			reg = <0x0 0xd4017600 0x0 0x100>;
+			clocks = <&syscon_apbc CLK_UART7>,
+				 <&syscon_apbc CLK_UART7_BUS>;
+			clock-names = "core", "bus";
 			interrupts = <49>;
-			clock-frequency = <14857000>;
 			reg-shift = <2>;
 			reg-io-width = <4>;
 			status = "disabled";
@@ -430,8 +444,10 @@
 		uart8: serial@d4017700 {
 			compatible = "spacemit,k1-uart", "intel,xscale-uart";
 			reg = <0x0 0xd4017700 0x0 0x100>;
+			clocks = <&syscon_apbc CLK_UART8>,
+				 <&syscon_apbc CLK_UART8_BUS>;
+			clock-names = "core", "bus";
 			interrupts = <50>;
-			clock-frequency = <14857000>;
 			reg-shift = <2>;
 			reg-io-width = <4>;
 			status = "disabled";
@@ -440,8 +456,10 @@
 		uart9: serial@d4017800 {
 			compatible = "spacemit,k1-uart", "intel,xscale-uart";
 			reg = <0x0 0xd4017800 0x0 0x100>;
+			clocks = <&syscon_apbc CLK_UART9>,
+				 <&syscon_apbc CLK_UART9_BUS>;
+			clock-names = "core", "bus";
 			interrupts = <51>;
-			clock-frequency = <14857000>;
 			reg-shift = <2>;
 			reg-io-width = <4>;
 			status = "disabled";