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 <[email protected]>
---
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..fe10ad8
--- /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 = <92000000>;
+ 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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