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..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>; 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