板子：rk3568
平台：android11

1.添加驱动

驱动文件列表：

-rw-rw-r-- 1 vtlk vtlk  17979 10月 20 14:04  goodix_tool.c
-rw-rw-r-- 1 vtlk vtlk    965 7月  11 16:52 'GT9110P(2020)V71_Config_20201028_170326.cfg'
-rw-rw-r-- 1 vtlk vtlk    929 7月  11 16:52  GT9110P_Config_20160217_1526_2048_97.cfg
-rw-rw-r-- 1 vtlk vtlk    929 7月  11 16:52  GT9271_Config_20170526.cfg
-rw-rw-r-- 1 vtlk vtlk  87561 10月 20 15:30  gt9xx.c
-rw-rw-r-- 1 vtlk vtlk   1853 7月  11 16:52  gt9xx_cfg.h
-rw-rw-r-- 1 vtlk vtlk 224220 10月 20 11:38  gt9xx_firmware.h
-rw-rw-r-- 1 vtlk vtlk  14656 10月 20 15:13  gt9xx.h
-rw-rw-r-- 1 vtlk vtlk 106042 10月 20 11:38  gt9xx_update.c
-rw-rw-r-- 1 vtlk vtlk    929 7月  11 16:52  HLS-0102-1398V1-1060-GT911_Config_20201204_V66.cfg
-rw-rw-r-- 1 vtlk vtlk    152 10月 20 15:45  Makefile
-rw-rw-r-- 1 vtlk vtlk    929 7月  11 16:52  WGJ10162B_GT9271_1060_Config_20140821_1341110X42.cfg
-rw-rw-r-- 1 vtlk vtlk    929 7月  11 16:52  WGJ10162_GT9271_Config_20140820_182456.cfg
-rw-rw-r-- 1 vtlk vtlk   1366 7月  11 16:52  WGJ10187_GT910_Config_20140623_104014_0X41.cfg
-rw-rw-r-- 1 vtlk vtlk    929 7月  11 16:52  WGJ10187_GT9271_Config_20140623_104014_0X41.cfg
-rwxrwxr-x 1 vtlk vtlk    929 7月  11 16:52  WGJ89006B_GT911_Config_20140625_085816_0X43.cfg
-rw-rw-r-- 1 vtlk vtlk    929 7月  11 16:52  WGJ89006B_GT9271_Config_20140625_085816_0X41.cfg

首先是设备树配置：

&i2c1 {status = "okay";gt928:gt928@14 {compatible = "goodix,gt9xx";//"goodix,gt928";status = "okay";reg = <0x14>;pinctrl-names = "default";pinctrl-0 = <&gt928_reset_pin &gt928_int_pin>;interrupt-parent = <&gpio0>;interrupts = <RK_PB5 IRQ_TYPE_EDGE_FALLING>;touch-gpio = <&gpio0 RK_PB5 0>;reset-gpio = <&gpio0 RK_PB6 0>;max-x = <800>;max-y = <1280>;tp-size = <928>;};
};

这里的touch-gpio,reset-gpio,max-x,max-y,tp-size是根据probe代码里获取设备树属性来确定的，drivers/input/touchscreen/gt9xx/gt9xx.c中probe部分代码如下:

static int goodix_ts_probe(struct i2c_client *client, const struct i2c_device_id *id)
{s32 ret = -1;struct goodix_ts_data *ts;u16 version_info;struct device_node *np = client->dev.of_node;enum of_gpio_flags rst_flags, pwr_flags;u32 val;...if (of_property_read_u32(np, "tp-size", &val)) {dev_err(&client->dev, "no max-x defined\n");return -EINVAL;}ts->tp_regulator = devm_regulator_get(&client->dev, "tp");if (IS_ERR(ts->tp_regulator)) {dev_err(&client->dev, "failed to get regulator, %ld\n",PTR_ERR(ts->tp_regulator));return PTR_ERR(ts->tp_regulator);}ret = regulator_enable(ts->tp_regulator);if (ret < 0)GTP_ERROR("failed to enable tp regulator\n");msleep(20);ts->irq_pin = of_get_named_gpio_flags(np, "touch-gpio", 0, (enum of_gpio_flags *)(&ts->irq_flags));ts->rst_pin = of_get_named_gpio_flags(np, "reset-gpio", 0, &rst_flags);ts->pwr_pin = of_get_named_gpio_flags(np, "power-gpio", 0, &pwr_flags);//ts->tp_select_pin = of_get_named_gpio_flags(np, "tp-select-gpio", 0, &tp_select_flags);if (of_property_read_u32(np, "max-x", &val)) {dev_err(&client->dev, "no max-x defined\n");return -EINVAL;}//ts->abs_x_max = val;if (of_property_read_u32(np, "max-y", &val)) {dev_err(&client->dev, "no max-y defined\n");return -EINVAL;}//ts->abs_y_max = val;if (of_property_read_u32(np, "configfile-num", &val)) {ts->cfg_file_num = 0;} else {ts->cfg_file_num = val;}ts->pendown =PEN_RELEASE;ts->client = client;...if (of_property_read_bool(np, "wakeup-source")){device_init_wakeup(&client->dev, 1);enable_irq_wake(ts->irq);}...
}

这里的max-x，max-y是屏幕尺寸对应触摸最大范围；touch-gpio,reset-gpio,分别表示对应的中断检测脚和复位脚；tp-size对应的是正反转的，我这里是直接在gt9xx.c修改全局变量所以tp-size根据需要来配置就可以了；
其次就是在deconfig文件中添加编译

CONFIG_TOUCHSCREEN_GT9XX=y

编译好后download到板子上，成功后的log:

[    1.129428] goodix_ts_probe() start
[    1.129483] Goodix-TS 1-0014: 1-0014 supply tp not found, using dummy regulator
[    1.129565] Goodix-TS 1-0014: Linked as a consumer to regulator.0
[    1.320703] input: goodix-ts as /devices/platform/fe5a0000.i2c/i2c-1/1-0014/input/input1

被注册成输入设备1了
或者使用命令 adb shell getevent 打开输入检测，触摸屏幕会在终端上打印触摸坐标信息，如：

vtlk:~$adb shell getevent
add device 1: /dev/input/event1name:     "goodix-ts"
add device 2: /dev/input/event3name:     "gpio-keys"
add device 3: /dev/input/event0name:     "rk805 pwrkey"
add device 4: /dev/input/event2name:     "adc-keys"
add device 5: /dev/input/event4name:     "rk-headset"
/dev/input/event1: 0001 014a 00000001
/dev/input/event1: 0003 0035 000002e8
/dev/input/event1: 0003 0036 0000021f
/dev/input/event1: 0003 0030 00000020
/dev/input/event1: 0003 0032 00000020
/dev/input/event1: 0003 0039 00000000
/dev/input/event1: 0000 0002 00000000
/dev/input/event1: 0000 0000 00000000
/dev/input/event1: 0003 0035 000002e8

2.问题

对应的x和y轴的相反，可以修改drivers/input/touchscreen/gt9xx/gt9xx.c中的全局变量：

static u8 gtp_change_x2y = FALSE;

如果只是x左右相反或折y方向的上下相反可以修改如下量个变量

static u8 gtp_x_reverse = TRUE;
static u8 gtp_y_reverse = TRUE;