ARM: dts: Configure interconnect target module for am437x dispc

We can now probe devices with device tree only configuration using
ti-sysc interconnect target module driver. Let's configure the
module, but keep the legacy "ti,hwmods" peroperty until the child
devices are probing with ti-sysc interconnect driver.

Note that we also fix a harmless typo for the node name, it's
dispc@400, not dispc@4000.

Cc: Jyri Sarha <jsarha@ti.com>
Cc: Keerthy <j-keerthy@ti.com>
Cc: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Cc: Tomi Valkeinen <tomi.valkeinen@ti.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>

arch/arm/boot/dts/am437x-l4.dtsi

@@ -2150,16 +2150,40 @@ dss: dss@0 {
 					 <0x00000c00 0x00000c00 0x00000400>,
 					 <0x00001000 0x00001000 0x00001000>;
 
-				dispc: dispc@4000 {
+				target-module@400 {
+					compatible = "ti,sysc-omap2", "ti,sysc";
+					ti,hwmods = "dss_dispc";
+					reg = <0x400 0x4>,
+					      <0x410 0x4>,
+					      <0x414 0x4>;
+					reg-names = "rev", "sysc", "syss";
+					ti,sysc-sidle = <SYSC_IDLE_FORCE>,
+							<SYSC_IDLE_NO>,
+							<SYSC_IDLE_SMART>;
+					ti,sysc-midle = <SYSC_IDLE_FORCE>,
+							<SYSC_IDLE_NO>,
+							<SYSC_IDLE_SMART>;
+					ti,sysc-mask = <(SYSC_OMAP2_CLOCKACTIVITY |
+							 SYSC_OMAP2_ENAWAKEUP |
+							 SYSC_OMAP2_SOFTRESET |
+							 SYSC_OMAP2_AUTOIDLE)>;
+					ti,syss-mask = <1>;
+					clocks = <&dss_clkctrl AM4_DSS_DSS_CORE_CLKCTRL 0>;
+					clock-names = "fck";
+					#address-cells = <1>;
+					#size-cells = <1>;
+					ranges = <0 0x400 0x400>;
+
+					dispc: dispc@0 {
 						compatible = "ti,omap3-dispc";
-					reg = <0x400 0x400>;
+						reg = <0 0x400>;
 						interrupts = <GIC_SPI 127 IRQ_TYPE_LEVEL_HIGH>;
-					ti,hwmods = "dss_dispc";
 						clocks = <&disp_clk>;
 						clock-names = "fck";
 
 						max-memory-bandwidth = <230000000>;
 					};
+				};
 
 				rfbi: rfbi@800 {
 					compatible = "ti,omap3-rfbi";