1. 修改DTS文件:
sun8i-h3-nanopi.dtsi 中, 增加 matrix = &matrix;
1 / { 2 aliases { 3 serial0 = &uart0; 4 serial1 = &uart1; 5 serial2 = &uart2; 6 serial3 = &uart3; 7 i2c0 = &i2c0; 8 i2c1 = &i2c1; 9 i2c2 = &i2c2; 10 spi0 = &spi0; 11 spi1 = &spi1; 12 pwm0 = &pwm; 13 mmc0 = &mmc0; 14 mmc2 = &mmc2; 15 ethernet0 = &emac; 16 i2s0 = &i2s0; 17 pcm5102a = &pcm5102a; 18 spidev0 =&spidev0; 19 matrix = &matrix; 20 ir = &ir; 21 };
增加 matrix: matrix@0在SPI0 節點下.
1 &spi0 { 2 /* needed to avoid dtc warning */
3 #address-cells = <1>; 4 #size-cells = <0>; 5 status = "okay"; 6 pinctrl-names = "default"; 7 pinctrl-0 = <&spi0_pins &spi_cs0_pin>;//<&spi0_pins &spi0_cs_pins>,
8 cs-gpios = <&pio 6 9 GPIO_ACTIVE_HIGH>;//<&pio 2 3 GPIO_ACTIVE_HIGH>, <&pio 0 6 GPIO_ACTIVE_HIGH>;
9
10 spidev0: spi@0 { 11 compatible = "nanopi,spidev"; 12 reg = <0>; 13 status = "disabled"; 14 spi-max-frequency = <10000000>; 15 }; 16
17 matrix: matrix@0{ 18 compatible = "fa,st7735s"; 19 reg = <0>; 20 status = "okay"; 21
22 spi-max-frequency = <32000000>; 23 fps = <33>; 24 rotate = <90>; 25 buswidth = <8>; 26
27 dc-gpios = <&pio 0 17 GPIO_ACTIVE_HIGH>; /* PA17 */
28 reset-gpios = <&pio 0 3 GPIO_ACTIVE_HIGH>; /* PA3 */
29 debug = <0x0>; 30 }; 31 }
2. 在linux 內核目錄/drivers/staging/fbtft/fbtft_device.c中 static struct fbtft_device_display displays[] 結構體中增加一個成員
{ .name = "matrix-st7735s", .spi = &(struct spi_board_info) { .modalias = "fb_st7735s", .max_speed_hz = 32000000, .bus_num = 0, .chip_select = 0, // third spi dev
.mode = SPI_MODE_0, // .controller_data= &spi_config,
.platform_data = &(struct fbtft_platform_data) { .display = { .buswidth = 8, .backlight = 1, }, .gpios = (const struct fbtft_gpio []) { { "reset", 3 }, { "dc" , 17 }, { "led", 1 }, { "cs" , 201 }, }, } }
4. make menuconfig 中配置,將4.14內核中的staging 中的fbtft部分編譯成模塊
3. 重新make dts , make uImage ,make modules. 然后分別更新SD卡的內核,dts,以及rootfs,
4. 在根據matrix部分內容,重新編譯QT后,運行./run.sh /dev/fb-st7735s ,就可以看見和3.5內核一致效果.