ns16550: unify serial_rockchip

Unify serial_rockchip, and use the generic binding.

Signed-off-by: Thomas Chou <thomas@wytron.com.tw>
Reviewed-by: Tom Rini <trini@konsulko.com>
Tested-by: Ariel D'Alessandro <ariel@vanguardiasur.com.ar>
Acked-by: Simon Glass <sjg@chromium.org>
diff --git a/arch/arm/dts/rk3288.dtsi b/arch/arm/dts/rk3288.dtsi
index 0f49709..ac367f8 100644
--- a/arch/arm/dts/rk3288.dtsi
+++ b/arch/arm/dts/rk3288.dtsi
@@ -324,6 +324,7 @@
 		interrupts = <GIC_SPI 55 IRQ_TYPE_LEVEL_HIGH>;
 		reg-shift = <2>;
 		reg-io-width = <4>;
+		clock-frequency = <24000000>;
 		clocks = <&cru SCLK_UART0>, <&cru PCLK_UART0>;
 		clock-names = "baudclk", "apb_pclk";
 		pinctrl-names = "default";
@@ -337,6 +338,7 @@
 		interrupts = <GIC_SPI 56 IRQ_TYPE_LEVEL_HIGH>;
 		reg-shift = <2>;
 		reg-io-width = <4>;
+		clock-frequency = <24000000>;
 		clocks = <&cru SCLK_UART1>, <&cru PCLK_UART1>;
 		clock-names = "baudclk", "apb_pclk";
 		pinctrl-names = "default";
@@ -350,6 +352,7 @@
 		interrupts = <GIC_SPI 57 IRQ_TYPE_LEVEL_HIGH>;
 		reg-shift = <2>;
 		reg-io-width = <4>;
+		clock-frequency = <24000000>;
 		clocks = <&cru SCLK_UART2>, <&cru PCLK_UART2>;
 		clock-names = "baudclk", "apb_pclk";
 		pinctrl-names = "default";
@@ -362,6 +365,7 @@
 		interrupts = <GIC_SPI 58 IRQ_TYPE_LEVEL_HIGH>;
 		reg-shift = <2>;
 		reg-io-width = <4>;
+		clock-frequency = <24000000>;
 		clocks = <&cru SCLK_UART3>, <&cru PCLK_UART3>;
 		clock-names = "baudclk", "apb_pclk";
 		pinctrl-names = "default";
@@ -375,6 +379,7 @@
 		interrupts = <GIC_SPI 59 IRQ_TYPE_LEVEL_HIGH>;
 		reg-shift = <2>;
 		reg-io-width = <4>;
+		clock-frequency = <24000000>;
 		clocks = <&cru SCLK_UART4>, <&cru PCLK_UART4>;
 		clock-names = "baudclk", "apb_pclk";
 		pinctrl-names = "default";