H5的spi控制器驱动, 可以通过 gpio 控制 spi 片选 (转载)

晕哥 · 2019-05-09 11:48:56

转自:

https://blog.csdn.net/jklinux/article/details/78701336

https://github.com/torvalds/linux/blob/master/drivers/spi/spi-sun6i.c

晕哥 · 2019-05-09 11:50:52

在设备树的文件 arch/arm64/boot/dts/allwinner/sunxi-h3-h5.dtsi里，厂家已写好两个spi控制器相关的设备节点:

    spi0_pins: spi0 {
        pins = "PC0", "PC1", "PC2", "PC3";
        function = "spi0";
    };

    spi1_pins: spi1 {
        pins = "PA15", "PA16", "PA14", "PA13";
        function = "spi1";
    };


spi0: spi@01c68000 {
    compatible = "allwinner,sun8i-h3-spi";
    reg = <0x01c68000 0x1000>;
    interrupts = <GIC_SPI 65 IRQ_TYPE_LEVEL_HIGH>;
    clocks = <&ccu CLK_BUS_SPI0>, <&ccu CLK_SPI0>;
    clock-names = "ahb", "mod";
    dmas = <&dma 23>, <&dma 23>;
    dma-names = "rx", "tx";
    pinctrl-names = "default";
    pinctrl-0 = <&spi0_pins>;
    resets = <&ccu RST_BUS_SPI0>;
    status = "disabled";
    #address-cells = <1>;
    #size-cells = <0>;
};

spi1: spi@01c69000 {
    compatible = "allwinner,sun8i-h3-spi";
    reg = <0x01c69000 0x1000>;
    interrupts = <GIC_SPI 66 IRQ_TYPE_LEVEL_HIGH>;
    clocks = <&ccu CLK_BUS_SPI1>, <&ccu CLK_SPI1>;
    clock-names = "ahb", "mod";
    dmas = <&dma 24>, <&dma 24>;
    dma-names = "rx", "tx";
    pinctrl-names = "default";
    pinctrl-0 = <&spi1_pins>;
    resets = <&ccu RST_BUS_SPI1>;
    status = "disabled";
    #address-cells = <1>;
    #size-cells = <0>;
};

在板级主要的设备树文件 arch/arm64/boot/dts/allwinner/sun50i-h5-nanopi-neo2.dts:

&pio {
...
    spi0_cs_pins: spi0_cs_pins {
        pins = "PC3", "PA6";
        function = "gpio_out";
    };
};

&spi0 {
    /* needed to avoid dtc warning */
    #address-cells = <1>;
    #size-cells = <0>;

    status = "okay";
    pinctrl-names = "default";
    pinctrl-0 = <&spi0_pins &spi0_cs_pins>;
    cs-gpios = <&pio 2 3 GPIO_ACTIVE_HIGH>, <&pio 0 6 GPIO_ACTIVE_HIGH>;
...

晕哥 · 2019-05-09 11:51:52

也就说，理论上V3s也可以通过配置设备树，使用 gpio 完成片选，实现 SPI 复用。

未测试
未测试
未测试

晕哥 · 2019-07-09 17:34:38

手动 up,路过有闲钱有闲心的大神可以测试一下

晕哥 · 2019-07-12 13:45:35

感谢QQ群的 @龙涎香 网友, ta 在 2019/07/09 18:27:40

验证过了，是可以的，多路复用.

WhyCan Forum(哇酷开发者社区)

楼主 #1 2019-05-09 11:48:56 分享评论

H5的spi控制器驱动, 可以通过 gpio 控制 spi 片选 (转载)

楼主 #2 2019-05-09 11:50:52 分享评论

Re: H5的spi控制器驱动, 可以通过 gpio 控制 spi 片选 (转载)

楼主 #3 2019-05-09 11:51:52 分享评论

Re: H5的spi控制器驱动, 可以通过 gpio 控制 spi 片选 (转载)

楼主 #4 2019-07-09 17:34:38 分享评论

Re: H5的spi控制器驱动, 可以通过 gpio 控制 spi 片选 (转载)

楼主 #5 2019-07-12 13:45:35 分享评论

Re: H5的spi控制器驱动, 可以通过 gpio 控制 spi 片选 (转载)

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