ARM: dts: sun6i: Fix RTC node

The RTC node doesn't match what is described in the binding for historical
reasons. Let's add the proper description.
Acked-by: Chen-Yu Tsai <wens@csie.org>
Signed-off-by: Maxime Ripard <maxime.ripard@bootlin.com>

arch/arm/boot/dts/sun6i-a31.dtsi

@@ -223,7 +223,7 @@ osc32k: clk-32k {
 			#clock-cells = <0>;
 			compatible = "fixed-clock";
 			clock-frequency = <32768>;
-			clock-output-names = "osc32k";
+			clock-output-names = "ext_osc32k";
 		};
 
 		/*
@@ -588,7 +588,7 @@ ohci2: usb@1c1c400 {
 		ccu: clock@1c20000 {
 			compatible = "allwinner,sun6i-a31-ccu";
 			reg = <0x01c20000 0x400>;
-			clocks = <&osc24M>, <&osc32k>;
+			clocks = <&osc24M>, <&rtc 0>;
 			clock-names = "hosc", "losc";
 			#clock-cells = <1>;
 			#reset-cells = <1>;
@@ -601,7 +601,7 @@ pio: pinctrl@1c20800 {
 				     <GIC_SPI 15 IRQ_TYPE_LEVEL_HIGH>,
 				     <GIC_SPI 16 IRQ_TYPE_LEVEL_HIGH>,
 				     <GIC_SPI 17 IRQ_TYPE_LEVEL_HIGH>;
-			clocks = <&ccu CLK_APB1_PIO>, <&osc24M>, <&osc32k>;
+			clocks = <&ccu CLK_APB1_PIO>, <&osc24M>, <&rtc 0>;
 			clock-names = "apb", "hosc", "losc";
 			gpio-controller;
 			interrupt-controller;
@@ -1287,10 +1287,13 @@ drc0_out_tcon1: endpoint@1 {
 		};
 
 		rtc: rtc@1f00000 {
+			#clock-cells = <1>;
 			compatible = "allwinner,sun6i-a31-rtc";
 			reg = <0x01f00000 0x54>;
 			interrupts = <GIC_SPI 40 IRQ_TYPE_LEVEL_HIGH>,
 				     <GIC_SPI 41 IRQ_TYPE_LEVEL_HIGH>;
+			clocks = <&osc32k>;
+			clock-output-names = "osc32k";
 		};
 
 		nmi_intc: interrupt-controller@1f00c00 {
@@ -1308,7 +1311,7 @@ prcm@1f01400 {
 			ar100: ar100_clk {
 				compatible = "allwinner,sun6i-a31-ar100-clk";
 				#clock-cells = <0>;
-				clocks = <&osc32k>, <&osc24M>,
+				clocks = <&rtc 0>, <&osc24M>,
 					 <&ccu CLK_PLL_PERIPH>,
 					 <&ccu CLK_PLL_PERIPH>;
 				clock-output-names = "ar100";
@@ -1343,7 +1346,7 @@ apb0_gates: apb0_gates_clk {
 			ir_clk: ir_clk {
 				#clock-cells = <0>;
 				compatible = "allwinner,sun4i-a10-mod0-clk";
-				clocks = <&osc32k>, <&osc24M>;
+				clocks = <&rtc 0>, <&osc24M>;
 				clock-output-names = "ir";
 			};
 
@@ -1373,7 +1376,7 @@ r_pio: pinctrl@1f02c00 {
 			reg = <0x01f02c00 0x400>;
 			interrupts = <GIC_SPI 45 IRQ_TYPE_LEVEL_HIGH>,
 				     <GIC_SPI 46 IRQ_TYPE_LEVEL_HIGH>;
-			clocks = <&apb0_gates 0>, <&osc24M>, <&osc32k>;
+			clocks = <&apb0_gates 0>, <&osc24M>, <&rtc 0>;
 			clock-names = "apb", "hosc", "losc";
 			resets = <&apb0_rst 0>;
 			gpio-controller;