ARM: dts: Modernize the Vexpress PL111 integration

The Versatile Express was submitted with the actual display
bridges unconnected (but defined in the device tree) and
mock "panels" encoded in the device tree node of the PL111
controller.

This doesn't even remotely describe the actual Versatile
Express hardware. Exploit the SiI9022 bridge by connecting
the PL111 pads to it, making it use EDID or fallback values
to drive the monitor.

The  also has to use the reserved memory through the
CMA pool rather than by open coding a memory region and
remapping it explicitly in the driver. To achieve this,
a reserved-memory node must exist in the root of the
device tree, so we need to pull that out of the
motherboard .dtsi include files, and push it into each
top-level device tree instead.

We do the same manouver for all the Versatile Express
boards, taking into account the different location of the
video RAM depending on which chip select is used on
each platform.

This plays nicely with the new PL111 DRM driver and
follows the standard ways of assigning bridges and
memory pools for graphics.

Cc: Sudeep Holla <sudeep.holla@arm.com>
Cc: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Cc: Liviu Dudau <liviu.dudau@arm.com>
Cc: Mali DP Maintainers <malidp@foss.arm.com>
Cc: Robin Murphy <robin.murphy@arm.com>
Tested-by: Liviu Dudau <liviu.dudau@arm.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

6 files changed, 108 insertions, 89 deletions

diff --git a/arch/arm/boot/dts/vexpress-v2m-rs1.dtsi b/arch/arm/boot/dts/vexpress-v2m-rs1.dtsi
index 4488c8fe213a..a9569d15de41 100644
--- a/arch/arm/boot/dts/vexpress-v2m-rs1.dtsi
+++ b/arch/arm/boot/dts/vexpress-v2m-rs1.dtsi
@@ -43,11 +43,6 @@
 				bank-width = <4>;
 			};
 
-			v2m_video_ram: vram@2,00000000 {
-				compatible = "arm,vexpress-vram";
-				reg = <2 0x00000000 0x00800000>;
-			};
-
 			ethernet@2,02000000 {
 				compatible = "smsc,lan9118", "smsc,lan9115";
 				reg = <2 0x02000000 0x10000>;
@@ -223,13 +218,24 @@
 				v2m_i2c_dvi: i2c@160000 {
 					compatible = "arm,versatile-i2c";
 					reg = <0x160000 0x1000>;
-
 					#address-cells = <1>;
 					#size-cells = <0>;
 
 					dvi-transmitter@39 {
 						compatible = "sil,sii9022-tpi", "sil,sii9022";
 						reg = <0x39>;
+
+						ports {
+							#address-cells = <1>;
+							#size-cells = <0>;
+
+							port@0 {
+								reg = <0>;
+								dvi_bridge_in: endpoint {
+									remote-endpoint = <&clcd_pads>;
+								};
+							};
+						};
 					};
 
 					dvi-transmitter@60 {
@@ -260,37 +266,16 @@
 					interrupts = <14>;
 					clocks = <&v2m_oscclk1>, <&smbclk>;
 					clock-names = "clcdclk", "apb_pclk";
-					memory-region = <&v2m_video_ram>;
-					max-memory-bandwidth = <50350000>; /* 16bpp @ 25.175MHz */
+					/* 800x600 16bpp @36MHz works fine */
+					max-memory-bandwidth = <54000000>;
+					memory-region = <&vram>;
 
 					port {
-						v2m_clcd_pads: endpoint {
-							remote-endpoint = <&v2m_clcd_panel>;
+						clcd_pads: endpoint {
+							remote-endpoint = <&dvi_bridge_in>;
 							arm,pl11x,tft-r0g0b0-pads = <0 8 16>;
 						};
 					};
-
-					panel {
-						compatible = "panel-dpi";
-
-						port {
-							v2m_clcd_panel: endpoint {
-								remote-endpoint = <&v2m_clcd_pads>;
-							};
-						};
-
-						panel-timing {
-							clock-frequency = <25175000>;
-							hactive = <640>;
-							hback-porch = <40>;
-							hfront-porch = <24>;
-							hsync-len = <96>;
-							vactive = <480>;
-							vback-porch = <32>;
-							vfront-porch = <11>;
-							vsync-len = <2>;
-						};
-					};
 				};
 			};
 
diff --git a/arch/arm/boot/dts/vexpress-v2m.dtsi b/arch/arm/boot/dts/vexpress-v2m.dtsi
index 4db42f6326a3..fd42e1194179 100644
--- a/arch/arm/boot/dts/vexpress-v2m.dtsi
+++ b/arch/arm/boot/dts/vexpress-v2m.dtsi
@@ -43,11 +43,6 @@
 				bank-width = <4>;
 			};
 
-			v2m_video_ram: vram@3,00000000 {
-				compatible = "arm,vexpress-vram";
-				reg = <3 0x00000000 0x00800000>;
-			};
-
 			ethernet@3,02000000 {
 				compatible = "smsc,lan9118", "smsc,lan9115";
 				reg = <3 0x02000000 0x10000>;
@@ -223,13 +218,37 @@
 				v2m_i2c_dvi: i2c@16000 {
 					compatible = "arm,versatile-i2c";
 					reg = <0x16000 0x1000>;
-
 					#address-cells = <1>;
 					#size-cells = <0>;
 
 					dvi-transmitter@39 {
 						compatible = "sil,sii9022-tpi", "sil,sii9022";
 						reg = <0x39>;
+
+						ports {
+							#address-cells = <1>;
+							#size-cells = <0>;
+
+							/*
+							 * Both the core tile and the motherboard routes their output
+							 * pads to this transmitter. The motherboard system controller
+							 * can select one of them as input using a mux register in
+							 * "arm,vexpress-muxfpga". The Vexpress with the CA9 core tile is
+							 * the only platform with this specific set-up.
+							 */
+							port@0 {
+								reg = <0>;
+								dvi_bridge_in_ct: endpoint {
+									remote-endpoint = <&clcd_pads_ct>;
+								};
+							};
+							port@1 {
+								reg = <1>;
+								dvi_bridge_in_mb: endpoint {
+									remote-endpoint = <&clcd_pads_mb>;
+								};
+							};
+						};
 					};
 
 					dvi-transmitter@60 {
@@ -253,6 +272,7 @@
 					reg-shift = <2>;
 				};
 
+
 				clcd@1f000 {
 					compatible = "arm,pl111", "arm,primecell";
 					reg = <0x1f000 0x1000>;
@@ -260,37 +280,16 @@
 					interrupts = <14>;
 					clocks = <&v2m_oscclk1>, <&smbclk>;
 					clock-names = "clcdclk", "apb_pclk";
-					memory-region = <&v2m_video_ram>;
-					max-memory-bandwidth = <50350000>; /* 16bpp @ 25.175MHz */
+					/* 800x600 16bpp @36MHz works fine */
+					max-memory-bandwidth = <54000000>;
+					memory-region = <&vram>;
 
 					port {
-						v2m_clcd_pads: endpoint {
-							remote-endpoint = <&v2m_clcd_panel>;
+						clcd_pads_mb: endpoint {
+							remote-endpoint = <&dvi_bridge_in_mb>;
 							arm,pl11x,tft-r0g0b0-pads = <0 8 16>;
 						};
 					};
-
-					panel {
-						compatible = "panel-dpi";
-
-						port {
-							v2m_clcd_panel: endpoint {
-								remote-endpoint = <&v2m_clcd_pads>;
-							};
-						};
-
-						panel-timing {
-							clock-frequency = <25175000>;
-							hactive = <640>;
-							hback-porch = <40>;
-							hfront-porch = <24>;
-							hsync-len = <96>;
-							vactive = <480>;
-							vback-porch = <32>;
-							vfront-porch = <11>;
-							vsync-len = <2>;
-						};
-					};
 				};
 			};
 
diff --git a/arch/arm/boot/dts/vexpress-v2p-ca15-tc1.dts b/arch/arm/boot/dts/vexpress-v2p-ca15-tc1.dts
index 3971427a105b..0dc4277d5f8b 100644
--- a/arch/arm/boot/dts/vexpress-v2p-ca15-tc1.dts
+++ b/arch/arm/boot/dts/vexpress-v2p-ca15-tc1.dts
@@ -53,6 +53,20 @@
 		reg = <0 0x80000000 0 0x40000000>;
 	};
 
+	reserved-memory {
+		#address-cells = <2>;
+		#size-cells = <2>;
+		ranges;
+
+		/* Chipselect 2 is physically at 0x18000000 */
+		vram: vram@18000000 {
+			/* 8 MB of designated video RAM */
+			compatible = "shared-dma-pool";
+			reg = <0 0x18000000 0 0x00800000>;
+			no-map;
+		};
+	};
+
 	hdlcd@2b000000 {
 		compatible = "arm,hdlcd";
 		reg = <0 0x2b000000 0 0x1000>;
diff --git a/arch/arm/boot/dts/vexpress-v2p-ca15_a7.dts b/arch/arm/boot/dts/vexpress-v2p-ca15_a7.dts
index ac6b90e9d806..a5136b1adaa2 100644
--- a/arch/arm/boot/dts/vexpress-v2p-ca15_a7.dts
+++ b/arch/arm/boot/dts/vexpress-v2p-ca15_a7.dts
@@ -104,6 +104,20 @@
 		reg = <0 0x80000000 0 0x40000000>;
 	};
 
+	reserved-memory {
+		#address-cells = <2>;
+		#size-cells = <2>;
+		ranges;
+
+		/* Chipselect 2 is physically at 0x18000000 */
+		vram: vram@18000000 {
+			/* 8 MB of designated video RAM */
+			compatible = "shared-dma-pool";
+			reg = <0 0x18000000 0 0x00800000>;
+			no-map;
+		};
+	};
+
 	wdt@2a490000 {
 		compatible = "arm,sp805", "arm,primecell";
 		reg = <0 0x2a490000 0 0x1000>;
diff --git a/arch/arm/boot/dts/vexpress-v2p-ca5s.dts b/arch/arm/boot/dts/vexpress-v2p-ca5s.dts
index e5b4a7570a01..d5b47d526f9e 100644
--- a/arch/arm/boot/dts/vexpress-v2p-ca5s.dts
+++ b/arch/arm/boot/dts/vexpress-v2p-ca5s.dts
@@ -55,6 +55,20 @@
 		reg = <0x80000000 0x40000000>;
 	};
 
+	reserved-memory {
+		#address-cells = <1>;
+		#size-cells = <1>;
+		ranges;
+
+		/* Chipselect 2 is physically at 0x18000000 */
+		vram: vram@18000000 {
+			/* 8 MB of designated video RAM */
+			compatible = "shared-dma-pool";
+			reg = <0x18000000 0x00800000>;
+			no-map;
+		};
+	};
+
 	hdlcd@2a110000 {
 		compatible = "arm,hdlcd";
 		reg = <0x2a110000 0x1000>;
diff --git a/arch/arm/boot/dts/vexpress-v2p-ca9.dts b/arch/arm/boot/dts/vexpress-v2p-ca9.dts
index fc43873cbdff..d796efaadbe3 100644
--- a/arch/arm/boot/dts/vexpress-v2p-ca9.dts
+++ b/arch/arm/boot/dts/vexpress-v2p-ca9.dts
@@ -69,6 +69,20 @@
 		reg = <0x60000000 0x40000000>;
 	};
 
+	reserved-memory {
+		#address-cells = <1>;
+		#size-cells = <1>;
+		ranges;
+
+		/* Chipselect 3 is physically at 0x4c000000 */
+		vram: vram@4c000000 {
+			/* 8 MB of designated video RAM */
+			compatible = "shared-dma-pool";
+			reg = <0x4c000000 0x00800000>;
+			no-map;
+		};
+	};
+
 	clcd@10020000 {
 		compatible = "arm,pl111", "arm,primecell";
 		reg = <0x10020000 0x1000>;
@@ -76,36 +90,15 @@
 		interrupts = <0 44 4>;
 		clocks = <&oscclk1>, <&oscclk2>;
 		clock-names = "clcdclk", "apb_pclk";
-		max-memory-bandwidth = <130000000>; /* 16bpp @ 63.5MHz */
+		/* 1024x768 16bpp @65MHz */
+		max-memory-bandwidth = <95000000>;
 
 		port {
-			clcd_pads: endpoint {
-				remote-endpoint = <&clcd_panel>;
+			clcd_pads_ct: endpoint {
+				remote-endpoint = <&dvi_bridge_in_ct>;
 				arm,pl11x,tft-r0g0b0-pads = <0 8 16>;
 			};
 		};
-
-		panel {
-			compatible = "panel-dpi";
-
-			port {
-				clcd_panel: endpoint {
-					remote-endpoint = <&clcd_pads>;
-				};
-			};
-
-			panel-timing {
-				clock-frequency = <63500127>;
-				hactive = <1024>;
-				hback-porch = <152>;
-				hfront-porch = <48>;
-				hsync-len = <104>;
-				vactive = <768>;
-				vback-porch = <23>;
-				vfront-porch = <3>;
-				vsync-len = <4>;
-			};
-		};
 	};
 
 	memory-controller@100e0000 {