[PATCH v3] ARM: dts: am335x-bone: add support for beaglebone LCD4 cape

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This patch adds support for LCD4 cape as advertised on
  http://elinux.org/CircuitCo:BeagleBone_LCD4

This cape has:
* 480x272 TFT-LCD panel
 - LCD panel datasheet and timing information are sourced from [1]
 - LCD backlight is connected to 'EHRPWM1A' on cape board, but its used for
   enabling backlight power-supply. So 'gpio-backlight' driver is used instead
   of 'pwm-backlight' driver (Kconfig: BACKLIGHT_GPIO=y).

* 4-wire resistive Touchscreen

*Known constrains*
As LCD panel pins (lcd_data, hsync, vsync, pclk) are shared with on-board
NXP HDMI framer, so either HDMI or LCD-cape can be used at time. Thus while
using this cape 'hdmi' DT node needs to be disabled in am335x-boneblack.dts

[1] www.newhavendisplay.com/specs/NHD-4.3-480272MF-ATXI-T-1.pdf
    www.newhavendisplay.com/app_notes/OTA5180A.pdf

Signed-off-by: Pekon Gupta <pekon@xxxxxx>
---
 arch/arm/boot/dts/am335x-bone-display-cape.dts | 104 +++++++++++++++++++++++++
 arch/arm/boot/dts/am335x-bone.dts              |   1 +
 arch/arm/boot/dts/am335x-boneblack.dts         |   1 +
 3 files changed, 106 insertions(+)
 create mode 100644 arch/arm/boot/dts/am335x-bone-display-cape.dts

diff --git a/arch/arm/boot/dts/am335x-bone-display-cape.dts b/arch/arm/boot/dts/am335x-bone-display-cape.dts
new file mode 100644
index 0000000..e2ab5e4
--- /dev/null
+++ b/arch/arm/boot/dts/am335x-bone-display-cape.dts
@@ -0,0 +1,104 @@
+/*
+ * Copyright (C) 2014 Texas Instruments Incorporated - http://www.ti.com/
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This DTS adds supports for display capes using LCD interface for display
+ * and GPIO or PWM interface for backlight controls.
+ */
+
+
+&am33xx_pinmux {
+	bbcape_backlight_pins: bbcape_backlight_pins {
+		pinctrl-single,pins = <
+			0x48  (PIN_OUTPUT | MUX_MODE7)		/* gpmc_a[2].GPIO1[18] (backlight control) */
+		>;
+	};
+
+	bbcape_lcd_pins: bbcape_lcd_pins {
+		pinctrl-single,pins = <
+			0xa0 (PIN_OUTPUT | MUX_MODE0)		/* lcd_data0.lcd_data0 */
+			0xa4 (PIN_OUTPUT | MUX_MODE0)		/* lcd_data1.lcd_data1 */
+			0xa8 (PIN_OUTPUT | MUX_MODE0)		/* lcd_data2.lcd_data2 */
+			0xac (PIN_OUTPUT | MUX_MODE0)		/* lcd_data3.lcd_data3 */
+			0xb0 (PIN_OUTPUT | MUX_MODE0)		/* lcd_data4.lcd_data4 */
+			0xb4 (PIN_OUTPUT | MUX_MODE0)		/* lcd_data5.lcd_data5 */
+			0xb8 (PIN_OUTPUT | MUX_MODE0)		/* lcd_data6.lcd_data6 */
+			0xbc (PIN_OUTPUT | MUX_MODE0)		/* lcd_data7.lcd_data7 */
+			0xc0 (PIN_OUTPUT | MUX_MODE0)		/* lcd_data8.lcd_data8 */
+			0xc4 (PIN_OUTPUT | MUX_MODE0)		/* lcd_data9.lcd_data9 */
+			0xc8 (PIN_OUTPUT | MUX_MODE0)		/* lcd_data10.lcd_data10 */
+			0xcc (PIN_OUTPUT | MUX_MODE0)		/* lcd_data11.lcd_data11 */
+			0xd0 (PIN_OUTPUT | MUX_MODE0)		/* lcd_data12.lcd_data12 */
+			0xd4 (PIN_OUTPUT | MUX_MODE0)		/* lcd_data13.lcd_data13 */
+			0xd8 (PIN_OUTPUT | MUX_MODE0)		/* lcd_data14.lcd_data14 */
+			0xdc (PIN_OUTPUT | MUX_MODE0)		/* lcd_data15.lcd_data15 */
+			0xe0 (PIN_OUTPUT | MUX_MODE0)		/* lcd_vsync.lcd_vsync */
+			0xe4 (PIN_OUTPUT | MUX_MODE0)		/* lcd_hsync.lcd_hsync */
+			0xe8 (PIN_OUTPUT | MUX_MODE0)		/* lcd_pclk.lcd_pclk */
+			0xec (PIN_OUTPUT | MUX_MODE0)		/* lcd_ac_bias_en.lcd_ac_bias_en (lcd_en) */
+			0x1a4 (PIN_OUTPUT_PULLUP | MUX_MODE7)	/* mcasp0_fsr.gpio3[19] (lcd_disen) */
+		>;
+	};
+
+	bbcape_touchscreen_pins: bbcape_touchscreen_pins {
+		pinctrl-single,pins = <
+			0x184 (PIN_INPUT_PULLDOWN | MUX_MODE7)		/* uart1_txd.gpio0[15] (enter) */
+			0x40  (PIN_INPUT_PULLDOWN | MUX_MODE7)		/* gpmc_a0.gpio1[16] (left) */
+			0x44  (PIN_INPUT_PULLDOWN | MUX_MODE7)		/* gpmc_a1.gpio1[17] (right) */
+			0x4c  (PIN_INPUT_PULLDOWN | MUX_MODE7)		/* gpmc_a3.gpio1[19] (up) */
+			0x198 (PIN_INPUT_PULLDOWN | MUX_MODE7)		/* mcasp0_axr0.gpio3[16] (down) */
+		>;
+	};
+};
+
+
+/ {
+	backlight {
+		status = "disabled";
+		compatible = "gpio-backlight";
+		pinctrl-names = "default";
+		pinctrl-0 = <&bbcape_backlight_pins>;
+		gpios = <&gpio1 18 GPIO_ACTIVE_HIGH>;
+		default-on;
+	};
+
+	panel {
+		status = "disabled";
+		compatible = "ti,tilcdc,panel";
+		pinctrl-names = "default";
+		pinctrl-0 = <&bbcape_lcd_pins>;
+		panel-info {
+			ac-bias           = <255>;
+			ac-bias-intrpt    = <0>;
+			dma-burst-sz      = <16>;
+			bpp               = <16>;
+			fdd               = <0x80>;
+			sync-edge         = <0>;
+			sync-ctrl         = <1>;
+			raster-order      = <0>;
+			fifo-th           = <0>;
+		};
+		display-timings {
+			native-mode = <&timing0>;
+			/* www.newhavendisplay.com/app_notes/OTA5180A.pdf */
+			timing0: 480x272 {
+				clock-frequency = <9200000>;
+				hactive = <480>;
+				vactive = <272>;
+				hfront-porch = <8>;
+				hback-porch = <47>;
+				hsync-len = <41>;
+				vback-porch = <2>;
+				vfront-porch = <3>;
+				vsync-len = <10>;
+				hsync-active = <0>;
+				vsync-active = <0>;
+				de-active = <1>;
+				pixelclk-active = <0>;
+			};
+		};
+	};
+};
diff --git a/arch/arm/boot/dts/am335x-bone.dts b/arch/arm/boot/dts/am335x-bone.dts
index f16bfcf..41439dc 100644
--- a/arch/arm/boot/dts/am335x-bone.dts
+++ b/arch/arm/boot/dts/am335x-bone.dts
@@ -10,6 +10,7 @@
 #include "am33xx.dtsi"
 #include "am335x-bone-common.dtsi"
 #include "am335x-bone-memory-cape.dts"
+#include "am335x-bone-display-cape.dts"
 
 &ldo3_reg {
 	regulator-min-microvolt = <1800000>;
diff --git a/arch/arm/boot/dts/am335x-boneblack.dts b/arch/arm/boot/dts/am335x-boneblack.dts
index e6d7e54..03232c7 100644
--- a/arch/arm/boot/dts/am335x-boneblack.dts
+++ b/arch/arm/boot/dts/am335x-boneblack.dts
@@ -10,6 +10,7 @@
 #include "am33xx.dtsi"
 #include "am335x-bone-common.dtsi"
 #include "am335x-bone-memory-cape.dts"
+#include "am335x-bone-display-cape.dts"
 
 &ldo3_reg {
 	regulator-min-microvolt = <1800000>;
-- 
1.8.5.1.163.gd7aced9

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