ARC: [nsimosci] Enable ARC PGU on nSIM OSCI virtual platforms

With required ARC PGU updates that allow it to be used on simulation
platforms we may finally utilize ARC PGU in nSIM OSCI virtual platforms
with modern Linux kernels.

Signed-off-by: Alexey Brodkin <abrodkin@synopsys.com>

arch/arc/boot/dts/nsimosci.dts

@@ -20,7 +20,7 @@
 		/* this is for console on PGU */
 		/* bootargs = "console=tty0 consoleblank=0"; */
 		/* this is for console on serial */
-		bootargs = "earlycon=uart8250,mmio32,0xf0000000,115200n8 console=tty0 console=ttyS0,115200n8 consoleblank=0 debug";
+		bootargs = "earlycon=uart8250,mmio32,0xf0000000,115200n8 console=tty0 console=ttyS0,115200n8 consoleblank=0 debug video=640x480-24";
 	};
 
 	aliases {
@@ -58,9 +58,17 @@
 			no-loopback-test = <1>;
 		};
 
-		pgu0: pgu@f9000000 {
-			compatible = "snps,arcpgufb";
+		pguclk: pguclk {
+			#clock-cells = <0>;
+			compatible = "fixed-clock";
+			clock-frequency = <25175000>;
+		};
+
+		pgu@f9000000 {
+			compatible = "snps,arcpgu";
 			reg = <0xf9000000 0x400>;
+			clocks = <&pguclk>;
+			clock-names = "pxlclk";
 		};
 
 		ps2: ps2@f9001000 {

arch/arc/boot/dts/nsimosci_hs.dts

@@ -20,7 +20,7 @@
 		/* this is for console on PGU */
 		/* bootargs = "console=tty0 consoleblank=0"; */
 		/* this is for console on serial */
-		bootargs = "earlycon=uart8250,mmio32,0xf0000000,115200n8 console=tty0 console=ttyS0,115200n8 consoleblank=0 debug";
+		bootargs = "earlycon=uart8250,mmio32,0xf0000000,115200n8 console=tty0 console=ttyS0,115200n8 consoleblank=0 debug video=640x480-24";
 	};
 
 	aliases {
@@ -58,9 +58,17 @@
 			no-loopback-test = <1>;
 		};
 
-		pgu0: pgu@f9000000 {
-			compatible = "snps,arcpgufb";
+		pguclk: pguclk {
+			#clock-cells = <0>;
+			compatible = "fixed-clock";
+			clock-frequency = <25175000>;
+		};
+
+		pgu@f9000000 {
+			compatible = "snps,arcpgu";
 			reg = <0xf9000000 0x400>;
+			clocks = <&pguclk>;
+			clock-names = "pxlclk";
 		};
 
 		ps2: ps2@f9001000 {

arch/arc/boot/dts/nsimosci_hs_idu.dts

@@ -18,7 +18,7 @@
 
 	chosen {
 		/* this is for console on serial */
-		bootargs = "earlycon=uart8250,mmio32,0xf0000000,115200n8 console=tty0 console=ttyS0,115200n8 consoleblan=0 debug";
+		bootargs = "earlycon=uart8250,mmio32,0xf0000000,115200n8 console=tty0 console=ttyS0,115200n8 consoleblan=0 debug video=640x480-24";
 	};
 
 	aliases {
@@ -77,9 +77,17 @@
 			no-loopback-test = <1>;
 		};
 
-		pgu0: pgu@f9000000 {
-			compatible = "snps,arcpgufb";
+		pguclk: pguclk {
+			#clock-cells = <0>;
+			compatible = "fixed-clock";
+			clock-frequency = <25175000>;
+		};
+
+		pgu@f9000000 {
+			compatible = "snps,arcpgu";
 			reg = <0xf9000000 0x400>;
+			clocks = <&pguclk>;
+			clock-names = "pxlclk";
 		};
 
 		ps2: ps2@f9001000 {

arch/arc/configs/nsimosci_defconfig

@@ -58,7 +58,8 @@ CONFIG_SERIAL_8250_RUNTIME_UARTS=1
 CONFIG_SERIAL_OF_PLATFORM=y
 # CONFIG_HW_RANDOM is not set
 # CONFIG_HWMON is not set
-CONFIG_FB=y
+CONFIG_DRM=y
+CONFIG_DRM_ARCPGU=y
 CONFIG_FRAMEBUFFER_CONSOLE=y
 CONFIG_LOGO=y
 # CONFIG_HID is not set

arch/arc/configs/nsimosci_hs_defconfig

@@ -57,7 +57,8 @@ CONFIG_SERIAL_8250_RUNTIME_UARTS=1
 CONFIG_SERIAL_OF_PLATFORM=y
 # CONFIG_HW_RANDOM is not set
 # CONFIG_HWMON is not set
-CONFIG_FB=y
+CONFIG_DRM=y
+CONFIG_DRM_ARCPGU=y
 CONFIG_FRAMEBUFFER_CONSOLE=y
 CONFIG_LOGO=y
 # CONFIG_HID is not set

arch/arc/configs/nsimosci_hs_smp_defconfig

@@ -70,7 +70,8 @@ CONFIG_SERIAL_8250_DW=y
 CONFIG_SERIAL_OF_PLATFORM=y
 # CONFIG_HW_RANDOM is not set
 # CONFIG_HWMON is not set
-CONFIG_FB=y
+CONFIG_DRM=y
+CONFIG_DRM_ARCPGU=y
 CONFIG_FRAMEBUFFER_CONSOLE=y
 CONFIG_LOGO=y
 # CONFIG_HID is not set