arm64: dts: rockchip: add pinctrls for 16-bit/18-bit rgb interface to rk356x

The rk3568-pinctrl.dtsi only defines the 24-bit RGB interface. Add separate
nodes for the 16-bit and 18-bit version, respectively. While at it, split
off the clock/sync signals from the data signals.

The exact mapping of the data pins was discussed here:
https://lore.kernel.org/linux-rockchip/f33a0488-528c-99de-3279-3c0346a03fd6@wolfvision.net/T/Signed-off-by: NMichael Riesch <michael.riesch@wolfvision.net>
Link: https://lore.kernel.org/r/20230124054706.3921383-7-michael.riesch@wolfvision.netSigned-off-by: NHeiko Stuebner <heiko@sntech.de>

arch/arm64/boot/dts/rockchip/rk3568-pinctrl.dtsi

@@ -3117,4 +3117,98 @@
 				<0 RK_PA1 0 &pcfg_pull_none>;
 		};
 	};
+
+	lcdc {
+		/omit-if-no-ref/
+		lcdc_clock: lcdc-clock {
+			rockchip,pins =
+				/* lcdc_clk */
+				<3 RK_PA0 1 &pcfg_pull_none>,
+				/* lcdc_den */
+				<3 RK_PC3 1 &pcfg_pull_none>,
+				/* lcdc_hsync */
+				<3 RK_PC1 1 &pcfg_pull_none>,
+				/* lcdc_vsync */
+				<3 RK_PC2 1 &pcfg_pull_none>;
+		};
+
+		/omit-if-no-ref/
+		lcdc_data16: lcdc-data16 {
+			rockchip,pins =
+				/* lcdc_d3 */
+				<2 RK_PD3 1 &pcfg_pull_none>,
+				/* lcdc_d4 */
+				<2 RK_PD4 1 &pcfg_pull_none>,
+				/* lcdc_d5 */
+				<2 RK_PD5 1 &pcfg_pull_none>,
+				/* lcdc_d6 */
+				<2 RK_PD6 1 &pcfg_pull_none>,
+				/* lcdc_d7 */
+				<2 RK_PD7 1 &pcfg_pull_none>,
+				/* lcdc_d10 */
+				<3 RK_PA3 1 &pcfg_pull_none>,
+				/* lcdc_d11 */
+				<3 RK_PA4 1 &pcfg_pull_none>,
+				/* lcdc_d12 */
+				<3 RK_PA5 1 &pcfg_pull_none>,
+				/* lcdc_d13 */
+				<3 RK_PA6 1 &pcfg_pull_none>,
+				/* lcdc_d14 */
+				<3 RK_PA7 1 &pcfg_pull_none>,
+				/* lcdc_d15 */
+				<3 RK_PB0 1 &pcfg_pull_none>,
+				/* lcdc_d19 */
+				<3 RK_PB4 1 &pcfg_pull_none>,
+				/* lcdc_d20 */
+				<3 RK_PB5 1 &pcfg_pull_none>,
+				/* lcdc_d21 */
+				<3 RK_PB6 1 &pcfg_pull_none>,
+				/* lcdc_d22 */
+				<3 RK_PB7 1 &pcfg_pull_none>,
+				/* lcdc_d23 */
+				<3 RK_PC0 1 &pcfg_pull_none>;
+		};
+
+		/omit-if-no-ref/
+		lcdc_data18: lcdc-data18 {
+			rockchip,pins =
+				/* lcdc_d2 */
+				<2 RK_PD2 1 &pcfg_pull_none>,
+				/* lcdc_d3 */
+				<2 RK_PD3 1 &pcfg_pull_none>,
+				/* lcdc_d4 */
+				<2 RK_PD4 1 &pcfg_pull_none>,
+				/* lcdc_d5 */
+				<2 RK_PD5 1 &pcfg_pull_none>,
+				/* lcdc_d6 */
+				<2 RK_PD6 1 &pcfg_pull_none>,
+				/* lcdc_d7 */
+				<2 RK_PD7 1 &pcfg_pull_none>,
+				/* lcdc_d10 */
+				<3 RK_PA3 1 &pcfg_pull_none>,
+				/* lcdc_d11 */
+				<3 RK_PA4 1 &pcfg_pull_none>,
+				/* lcdc_d12 */
+				<3 RK_PA5 1 &pcfg_pull_none>,
+				/* lcdc_d13 */
+				<3 RK_PA6 1 &pcfg_pull_none>,
+				/* lcdc_d14 */
+				<3 RK_PA7 1 &pcfg_pull_none>,
+				/* lcdc_d15 */
+				<3 RK_PB0 1 &pcfg_pull_none>,
+				/* lcdc_d18 */
+				<3 RK_PB3 1 &pcfg_pull_none>,
+				/* lcdc_d19 */
+				<3 RK_PB4 1 &pcfg_pull_none>,
+				/* lcdc_d20 */
+				<3 RK_PB5 1 &pcfg_pull_none>,
+				/* lcdc_d21 */
+				<3 RK_PB6 1 &pcfg_pull_none>,
+				/* lcdc_d22 */
+				<3 RK_PB7 1 &pcfg_pull_none>,
+				/* lcdc_d23 */
+				<3 RK_PC0 1 &pcfg_pull_none>;
+		};
+	};
+
 };