我正在尝试在 Beaglebone Black Debian 映像的设备树中定义我的 SHARP 并行 24 位 LCD 屏幕panel-info。display-timings为此，我使用了覆盖.dtbo文件。我的问题是，我似乎无法找到某些值的计时，例如hsync-len和de-active夏普 LS037V7DW05 数据表。
我希望有更多阅读 LCD 数据表经验的人可以帮助我从该文档中解读正确的值以添加到我的覆盖文件中。
覆盖文件如下所示，很可能有错误：
/*
* Copyright (C) 2012 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.
*/
/dts-v1/;
/plugin/;
#include <dt-bindings/interrupt-controller/irq.h>
#include <dt-bindings/gpio/gpio.h>
#include <dt-bindings/pinctrl/am33xx.h>
#include <dt-bindings/board/am335x-bbw-bbb-base.h>
/ {
compatible = "ti,beaglebone", "ti,beaglebone-black";
/* identification */
part-number = "am335x-osd3358-mt";
version = "01";
/* state the resources this cape uses */
exclusive-use =
/* the pin header uses */
"P8.45", /* lcd: lcd_data0 */
"P8.46", /* lcd: lcd_data1 */
"P8.43", /* lcd: lcd_data2 */
"P8.44", /* lcd: lcd_data3 */
"P8.41", /* lcd: lcd_data4 */
"P8.42", /* lcd: lcd_data5 */
"P8.39", /* lcd: lcd_data6 */
"P8.40", /* lcd: lcd_data7 */
"P8.37", /* lcd: lcd_data8 */
"P8.38", /* lcd: lcd_data9 */
"P8.36", /* lcd: lcd_data10 */
"P8.34", /* lcd: lcd_data11 */
"P8.35", /* lcd: lcd_data12 */
"P8.33", /* lcd: lcd_data13 */
"P8.31", /* lcd: lcd_data14 */
"P8.32", /* lcd: lcd_data15 */
"P8.15", /* lcd: lcd_data16 */
"P8.16", /* lcd: lcd_data17 */
"P8.11", /* lcd: lcd_data18 */
"P8.12", /* lcd: lcd_data19 */
"P8.17", /* lcd: lcd_data20 */
"P8.14", /* lcd: lcd_data21 */
"P8.13", /* lcd: lcd_data22 */
"P8.19", /* lcd: lcd_data23 */
"P8.27", /* lcd: lcd_vsync */
"P8.29", /* lcd: lcd_hsync */
"P8.28", /* lcd: lcd_pclk */
"P8.30", /* lcd: lcd_ac_bias_en */
"P9.27", /* lcd: gpio3_19 DISPEN */
"P9.31", /* touch interrupt on gpio3_14 */
"P9.24", /*uart1_txd*/
"P9.26", /*uart1_rxd*/
/* the hardware IP uses */
"i2c2",
"gpio2_7",
"gpio2_8",
"gpio3_15",
"uart1",
"lcdc";
/*
* Free up the pins used by the cape from the pinmux helpers.
*/
fragment@0 {
target = <&ocp>;
__overlay__ {
P8_45_pinmux { status = "disabled"; }; /* lcd: lcd_data0 */
P8_46_pinmux { status = "disabled"; }; /* lcd: lcd_data1 */
P8_43_pinmux { status = "disabled"; }; /* lcd: lcd_data2 */
P8_44_pinmux { status = "disabled"; }; /* lcd: lcd_data3 */
P8_41_pinmux { status = "disabled"; }; /* lcd: lcd_data4 */
P8_42_pinmux { status = "disabled"; }; /* lcd: lcd_data5 */
P8_39_pinmux { status = "disabled"; }; /* lcd: lcd_data6 */
P8_40_pinmux { status = "disabled"; }; /* lcd: lcd_data7 */
P8_37_pinmux { status = "disabled"; }; /* lcd: lcd_data8 */
P8_38_pinmux { status = "disabled"; }; /* lcd: lcd_data9 */
P8_36_pinmux { status = "disabled"; }; /* lcd: lcd_data10 */
P8_34_pinmux { status = "disabled"; }; /* lcd: lcd_data11 */
P8_35_pinmux { status = "disabled"; }; /* lcd: lcd_data12 */
P8_33_pinmux { status = "disabled"; }; /* lcd: lcd_data13 */
P8_31_pinmux { status = "disabled"; }; /* lcd: lcd_data14 */
P8_32_pinmux { status = "disabled"; }; /* lcd: lcd_data15 */
P8_15_pinmux { status = "disabled"; }; /* gpmc_ad15.lcd_data16 */
P8_16_pinmux { status = "disabled"; }; /* gpmc_ad14.lcd_data17 */
P8_11_pinmux { status = "disabled"; }; /* gpmc_ad13.lcd_data18 */
P8_12_pinmux { status = "disabled"; }; /* gpmc_ad12.lcd_data19 */
P8_17_pinmux { status = "disabled"; }; /* gpmc_ad11.lcd_data20 */
P8_14_pinmux { status = "disabled"; }; /* gpmc_ad10.lcd_data21 */
P8_13_pinmux { status = "disabled"; }; /* gpmc_ad9.lcd_data22 */
P8_19_pinmux { status = "disabled"; }; /* gpmc_ad8.lcd_data23 */
P8_27_pinmux { status = "disabled"; }; /* lcd: lcd_vsync */
P8_29_pinmux { status = "disabled"; }; /* lcd: lcd_hsync */
P8_28_pinmux { status = "disabled"; }; /* lcd: lcd_pclk */
P8_30_pinmux { status = "disabled"; }; /* lcd: lcd_ac_bias_en */
P9_27_pinmux { status = "disabled"; }; /* lcd: gpio3_19 DISPEN */
P9_31_pinmux { status = "disabled"; }; /* touch interrupt on gpio3_21 */
};
};
fragment@1 {
target = <&am33xx_pinmux>;
__overlay__ {
bb_lcd_lcd_pins: pinmux_bb_lcd_lcd_pins {
pinctrl-single,pins = <
BONE_P8_45 (PIN_OUTPUT | MUX_MODE0) /* lcd: lcd_data0.lcd_data0 */
BONE_P8_46 (PIN_OUTPUT | MUX_MODE0) /* lcd: lcd_data1.lcd_data1 */
BONE_P8_43 (PIN_OUTPUT | MUX_MODE0) /* lcd: lcd_data2.lcd_data2 */
BONE_P8_44 (PIN_OUTPUT | MUX_MODE0) /* lcd: lcd_data3.lcd_data3 */
BONE_P8_41 (PIN_OUTPUT | MUX_MODE0) /* lcd: lcd_data4.lcd_data4 */
BONE_P8_42 (PIN_OUTPUT | MUX_MODE0) /* lcd: lcd_data5.lcd_data5 */
BONE_P8_39 (PIN_OUTPUT | MUX_MODE0) /* lcd: lcd_data6.lcd_data6 */
BONE_P8_40 (PIN_OUTPUT | MUX_MODE0) /* lcd: lcd_data7.lcd_data7 */
BONE_P8_37 (PIN_OUTPUT | MUX_MODE0) /* lcd: lcd_data8.lcd_data8 */
BONE_P8_38 (PIN_OUTPUT | MUX_MODE0) /* lcd: lcd_data9.lcd_data9 */
BONE_P8_36 (PIN_OUTPUT | MUX_MODE0) /* lcd: lcd_data10.lcd_data10 */
BONE_P8_34 (PIN_OUTPUT | MUX_MODE0) /* lcd: lcd_data11.lcd_data11 */
BONE_P8_35 (PIN_OUTPUT | MUX_MODE0) /* lcd: lcd_data12.lcd_data12 */
BONE_P8_33 (PIN_OUTPUT | MUX_MODE0) /* lcd: lcd_data13.lcd_data13 */
BONE_P8_31 (PIN_OUTPUT | MUX_MODE0) /* lcd: lcd_data14.lcd_data14 */
BONE_P8_32 (PIN_OUTPUT | MUX_MODE0) /* lcd: lcd_data15.lcd_data15 */
BONE_P8_15 (PIN_OUTPUT | MUX_MODE0) /* lcd: lcd_data15.lcd_data16 */
BONE_P8_16 (PIN_OUTPUT | MUX_MODE0) /* lcd: lcd_data15.lcd_data17 */
BONE_P8_11 (PIN_OUTPUT | MUX_MODE0) /* lcd: lcd_data15.lcd_data18 */
BONE_P8_12 (PIN_OUTPUT | MUX_MODE0) /* lcd: lcd_data15.lcd_data19 */
BONE_P8_17 (PIN_OUTPUT | MUX_MODE0) /* lcd: lcd_data15.lcd_data20 */
BONE_P8_14 (PIN_OUTPUT | MUX_MODE0) /* lcd: lcd_data15.lcd_data21 */
BONE_P8_13 (PIN_OUTPUT | MUX_MODE0) /* lcd: lcd_data15.lcd_data22 */
BONE_P8_19 (PIN_OUTPUT | MUX_MODE0) /* lcd: lcd_data15.lcd_data23 */
BONE_P8_27 (PIN_OUTPUT | MUX_MODE0) /* lcd: lcd_vsync.lcd_vsync */
BONE_P8_29 (PIN_OUTPUT | MUX_MODE0) /* lcd: lcd_hsync.lcd_hsync */
BONE_P8_28 (PIN_OUTPUT | MUX_MODE0) /* lcd: lcd_pclk.lcd_pclk */
BONE_P8_30 (PIN_OUTPUT | MUX_MODE0) /* lcd: lcd_ac_bias_en.lcd_ac_bias_en */
0x1a4 0x17 /* mcasp0_fsr.gpio3_19, OUTPUT | MODE7 LCD DISEN*/
>;
};
bb_uart1_pins: pinmux_bb_uart1_pins {
pinctrl-single,pins = <
0x184 0x20 /* P9.24 uart1_txd.uart1_txd OUTPUT */
0x180 0x20 /* P9.26 uart1_rxd.uart1_rxd INPUT */
>;
};
bu21023_tp_pins: pinmux_bu21023_tp_pins {
pinctrl-single,pins = <
0x190 0x37 // INPUT_PULLUP | MODE7
>;
};
gpio_helper_pins: pinmux_gpio_helper_pins {
pinctrl-single,pins = <
0x044 0x17 /* gpio2_7 gpmc_a1 | MODE7 | OUTPUT */
0x048 0x17 /* gpio2_8 gpmc_a2 | MODE7 | OUTPUT */
0x194 0x17 /* gpio3_15 mcasp0_fx | MODE7 | OUTPUT*/
/* OUTPUT GPIO(mode7) 0x07 pulldown, 0x17 pullup, 0x?f no pullup/down */
/* INPUT GPIO(mode7) 0x27 pulldown, 0x37 pullup, 0x?f no pullup/down */
>;
};
};
};
fragment@2 {
target = <&i2c2>;
__overlay__ {
status = "okay";
//pinctrl-names = "default";
//pinctrl-0 = <&bb_i2c2_pins>;
// configuration start
clock-frequency = <100000>;
#address-cells = <1>;
#size-cells = <0>;
bu21023:bu21023_ts@5d {
pinctrl-names = "default";
pinctrl-0 = <&bu21023_tp_pins>;
compatible = "rohm,bu21023_ts";
reg=<0x5d>;
touch-gpio = <&gpio3 14 IRQ_TYPE_LEVEL_HIGH>;
rohm,touch-max-x = <480>;
rohm,touch-max-y = <640>;
interrupt-parent = <&gpio3>;
interrupts = <14 IRQ_TYPE_LEVEL_HIGH>;
};
};
};
/*
* Helper to show loaded overlays under: /proc/device-tree/chosen/overlays/
*/
fragment@3 {
target-path="/";
__overlay__ {
chosen {
overlays {
am335x-osd3358-mt-01 = __TIMESTAMP__;
};
};
};
};
fragment@4 {
target = <&lcdc>;
__overlay__ {
status = "okay";
blue-and-red-wiring = "crossed";
};
};
fragment@5 {
target-path="/";
__overlay__ {
/* avoid stupid warning */
#address-cells = <1>;
#size-cells = <1>;
lcd0:panel {
status = "okay";
compatible = "ti,tilcdc,panel";
pinctrl-names = "default";
pinctrl-0 = <&lcd_pins>;
enable-gpios = <&gpio2 17 1>;
backlight = <&lcd_backlight>;
panel-info {
ac-bias = <255>;
ac-bias-intrpt = <0>;
dma-burst-sz = <16>;
bpp = <24>;
fdd = <0x80>;
sync-edge = <0>;
sync-ctrl = <1>;
raster-order = <0>;
fifo-th = <0>;
};
display-timings {
native-mode = <&timing0>;
timing0: 480x640 {
clock-frequency = <30000000>;
hactive = <480>;
vactive = <640>;
hfront-porch = <4>;
hback-porch = <2>;
hsync-len = <648>;
vback-porch = <0>;
vfront-porch = <0>;
vsync-len = <2>;
hsync-active = <0>;
vsync-active = <0>;
de-active = <1>;
pixelclk-active = <0>;
};
};
};
};
};
fragment@6 {
target = <&ocp>;
__overlay__ {
gpio_helper: gpios {
compatible = "bone-pinmux-helper";
status = "okay";
pinctrl-names = "default";
pinctrl-0 = <&gpio_helper_pins>;
//lcd_pwr_en {
// gpio-name = "LCD_PWR_EN";
// gpio = <&gpio3 7 0x00>; /* gpio3 is gpio2 */
// output;
// init-high;
//};
//lcd_reset {
// gpio-name = "LCD_RST";
// gpio = <&gpio3 8 0x00>; /* gpio3 is gpio2 */
// output;
// init-high;
//};
//ts_reset {
// gpio-name = "TS_RST";
// gpio = <&gpio4 15 0x00>; /* gpio3 is gpio2 */
// output;
// init-high;
//};
};
};
};
fragment@7 {
target = <&uart2>; /* really uart1 */
__overlay__ {
status = "okay";
pinctrl-names = "default";
pinctrl-0 = <&bb_uart1_pins>;
};
};
fragment@8 {
target-path = "/";
__overlay__ {
lcd_backlight: backlight {
status = "okay";
compatible = "gpio-backlight";
pinctrl-names = "default";
pinctrl-0 = <&backlight_pin>;
gpios = <&gpio2 17 GPIO_ACTIVE_HIGH>;
};
};
}
};