F1C100S添加USB驱动

１．添加设备树节点：

在.dti文件中添加如下节点：

otg_sram: sram-section@0 {
    compatible = "allwinner,suniv-f1c100s-sram-d",
             "allwinner,sun4i-a10-sram-d";
    reg = <0x0000 0x1000>;
    status = "disabled";
};

usb_otg: usb@1c13000 {
    compatible = "allwinner,suniv-musb";
    reg = <0x01c13000 0x0400>;
    clocks = <&ccu CLK_BUS_OTG>;
    resets = <&ccu RST_BUS_OTG>;
    interrupts = <26>;
    interrupt-names = "mc";
    phys = <&usbphy 0>;
    phy-names = "usb";
    extcon = <&usbphy 0>;
    allwinner,sram = <&otg_sram 1>;
    status = "disabled";
};

usbphy: phy@1c13400 {
    compatible = "allwinner,suniv-usb-phy";
    reg = <0x01c13400 0x10>;
    reg-names = "phy_ctrl";
    clocks = <&ccu CLK_USB_PHY0>;
    clock-names = "usb0_phy";
    resets = <&ccu RST_USB_PHY0>;
    reset-names = "usb0_reset";
    #phy-cells = <1>;
    status = "disabled";
};

然后在dts中开启设备节点：

&otg_sram {
        status = "okay";
};

&usb_otg {
        dr_mode = "otg";
        status = "okay";
};

&usbphy {
        usb0_id_det-gpio = <&pio 4 2 GPIO_ACTIVE_HIGH>; /* PE2 */
        status = "okay";
};

２．由于linux并没有对F1C100s写驱动，因此我们需要添加其驱动程序，步骤如下：

drivers/phy/allwinner/phy-sun4i-usb.c文件修改如下

大约在100行处添加：

suniv_phy,

大约在862处添加：

static const struct sun4i_usb_phy_cfg suniv_cfg = {
    .num_phys = 1,
    .type = suniv_phy,
    .disc_thresh = 3,
    .phyctl_offset = REG_PHYCTL_A10,
    .dedicated_clocks = true,
};

大约在985处添加：

{ .compatible = "allwinner,suniv-usb-phy", .data = &suniv_cfg },

drivers/usb/musb/sunxi.c文件修改如下

大约在717行添加如下：

||of_device_is_compatible(np, "allwinner,suniv-musb")

大约在724处添加如下：

||of_device_is_compatible(np, "allwinner,suniv-musb")

大约在817处添加如下：

{ .compatible = "allwinner,suniv-musb", },

修改好后保存所有修改文件

３．选择usb驱动添加到内核：

然后保存退出

４．编译测试：