@jian_jiang
蒋工，LCD屏背光默认改成低电平不生效。上电默认是高电平，需要改成默认低电平。不然会出现闪屏现象。
我的修改如下：dts和fbtft_device.c
pinctrl_lpspi2: lpspi2grp {
fsl,pins = <
IMX7ULP_PAD_PTE4__LPSPI2_SIN 0x0
IMX7ULP_PAD_PTE5__LPSPI2_SOUT 0x0
IMX7ULP_PAD_PTE6__LPSPI2_SCK 0x0
>;
};
pinctrl_lpspi2_cs: lpspi2cs {
fsl,pins = <
IMX7ULP_PAD_PTE7__PTE7 0x10003
>;
};
pinctrl_st7789v: st7789vgrp {
fsl,pins = <
IMX7ULP_PAD_PTE1__PTE1 0x10003
IMX7ULP_PAD_PTE14__PTE14 0x10003
IMX7ULP_PAD_PTE13__PTE13 0x10003 //backlight
>;
};
&lpspi2 {
#address-cells = <1>;
#size-cells = <0>;
pinctrl-names = "default", "sleep";
pinctrl-0 = <&pinctrl_lpspi2 &pinctrl_lpspi2_cs>;
cs-gpios = <&gpio_pte 7 GPIO_ACTIVE_LOW>;
//pinctrl-1 = <&pinctrl_lpspi2>;
status = "okay";
sd2088@0 {
compatible = "sitronix,st7789v";
reg = <0>;
// add pin ctrl
pinctrl-names = "default";
pinctrl-0 = <&pinctrl_st7789v>;
spi-max-frequency = <24000000>;
rotate = <0>;
bgr;
fps = <15>;
buswidth = <8>;
reset-gpios = <&gpio_pte 01 GPIO_ACTIVE_LOW>;
dc-gpios = <&gpio_pte 14 GPIO_ACTIVE_LOW>;
led-gpios = <&gpio_pte 13 GPIO_ACTIVE_LOW>;//backlight
debug = <0>;
};
};
static struct fbtft_device_display displays[] = {
{
.name = "sd2088",
.spi = &(struct spi_board_info) {
.modalias = "fb_st7789v",
.max_speed_hz = 24000000,
.mode = SPI_MODE_0,
.platform_data = &(struct fbtft_platform_data) {
.display = {
.buswidth = 8,
.backlight = 1,
.init_sequence = cberry28_init_sequence,
},
.gpios = (const struct fbtft_gpio []) {
{ "reset", 65},
{ "dc", 78 },
{ "led", 77 },//backlight
{},
},
.gamma = CBERRY28_GAMMA,
}
}
},
}
