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library:rk3568:lcddrv
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library:rk3568:lcddrv [2022/11/02 23:27] lhaosen [2. Linux驱动设计] |
library:rk3568:lcddrv [2022/11/02 23:55] (current) lhaosen [2. Linux驱动设计（A）] |
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| ^ 6 | BL | 171 | GPIO0_C3 | ^ 6 | BL | 171 | GPIO0_C3 | ||
| - | ===== - Linux驱动设计 ===== | + | ===== - Linux驱动设计（A） |
| - | ==== - gpio-leds + spidev | + | 采用gpio-leds + spidev方式连接LCD模块，模块端口信号采用两种驱动： |
| + | * io: / | ||
| + | * spi: / | ||
| - | 对/Reset,Backlight,cd 使用gpio-leds驱动， | + | ==== - 控制IO ==== |
| - | ==== - 内核配置 | + | === - dts === |
| + | < | ||
| + | lcd_reset: | ||
| + | label = " | ||
| + | linux,default-trigger = " | ||
| + | default-state = " | ||
| + | gpios = <& | ||
| + | }; | ||
| + | |||
| + | lcd_backlight: | ||
| + | label = " | ||
| + | linux,default-trigger = " | ||
| + | default-state = " | ||
| + | gpios = <& | ||
| + | }; | ||
| + | |||
| + | lcd_data: data { | ||
| + | label = " | ||
| + | linux, | ||
| + | default-state = " | ||
| + | gpios = <& | ||
| + | }; | ||
| + | </ | ||
| + | 添加以上3个pin的gpio-leds节点，驱动成功后的访问入口为： | ||
| + | / | ||
| + | / | ||
| + | / | ||
| + | |||
| + | 可以用命令测试这几个pin的状态： | ||
| + | # backlight = 1 | ||
| + | echo 1 > / | ||
| + | # backlight = 0 | ||
| + | echo 1 > / | ||
| + | ==== - spidev配置 ==== | ||
| + | 修改DTS及添加驱动到内核 | ||
| + | |||
| + | === - 内核配置spidev | ||
| Device Drivers ‐‐‐> | Device Drivers ‐‐‐> | ||
| Line 53: | Line 91: | ||
| [*] User mode SPI device driver support | [*] User mode SPI device driver support | ||
| - | ==== - dts配置 | + | === - dts配置 === |
| - | === - rk3568-firefly-mplayer.dtsi | + | * rk3568-firefly-mplayer.dtsi |
| - | == 使能spi0 == | + | 添加节点spi0 |
| - | &spi0 { | + | < |
| + | &spi0 { | ||
| status = " | status = " | ||
| max-freq = < | max-freq = < | ||
| - | | + | |
| + | pinctrl-1 = <& | ||
| + | spidev@0 { | ||
| compatible = " | compatible = " | ||
| - | reg = <0>; /* CS0 */ | + | reg = <0>; // CS0 |
| spi-max-frequency = < | spi-max-frequency = < | ||
| }; | }; | ||
| - | | + | }; |
| + | </ | ||
| + | * pinctrl-0/1 重写覆盖了原定义，cs脚使用 spi0m0_cs1 代替 spi0m0_cs0 | ||
| + | * 停用冲突的管脚: | ||
| - | == disable uart8 == | ||
| - | uart8于spi0管脚冲突，使uart8无效 | ||
| - | &uart8 { | ||
| - | status = " | ||
| - | }; | ||
| - | | ||
| | | ||
| ==== - Demo script ==== | ==== - Demo script ==== | ||
library/rk3568/lcddrv.1667402834.txt.gz · Last modified: 2022/11/02 23:27 by lhaosen
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