Platform: Rockchip
OS: Android 6.0
Kernel: 3.10.92

• • • 原理圖
    • 配置檔案
    • 參考

使用的是AP6335, 硬體上用的是SDIO0.

原理圖：

配置檔案:

電源部分:

wireless-wlan {
    compatible = "wlan-platdata";

    /* wifi_chip_type - wifi chip define
             * ap6210, ap6330, ap6335
             * rtl8188eu, rtl8723bs, rtl8723bu
             * esp8089
    */
 

    wifi_chip_type = "ap6335";
    sdio_vref = <1800>; //1800mv or 3300mv
    //keep_wifi_power_on;
    //power_ctrl_by_pmu;
    power_pmu_regulator = "act_ldo3";
    power_pmu_enable_level = <1>; //1->HIGH, 0->LOW
    //vref_ctrl_enable;
    //vref_ctrl_gpio = <&gpio0 GPIO_A2 GPIO_ACTIVE_HIGH>;
 

    vref_pmu_regulator = "act_ldo3";
    vref_pmu_enable_level = <1>; //1->HIGH, 0->LOW
    WIFI,poweren_gpio = <&gpio4 GPIO_D4 GPIO_ACTIVE_HIGH>;
    WIFI,host_wake_irq = <&gpio4 GPIO_D6 GPIO_ACTIVE_HIGH>;
    //WIFI,reset_gpio = <&gpio0 GPIO_A2 GPIO_ACTIVE_LOW>;
 

    status = "okay";
};

compatible = "wlan-platdata";
和rfkill-wlan.c電源驅動匹配

wifi_chip_type = "ap6335";
用它來判斷使用哪個硬體模組，載入對應的wifi驅動，配置。

sdio_vref = <1800>; //1800mv or 3300mv
wifi模組的IO電壓，設定錯誤會導致Wifi通訊異常引起WiFi打不開或者工作不穩定問題。

keep_wifi_power_on;
預設關閉，開啟後表示開機過程後就直接上電，並且一直保持上電狀態，後續的電源操作會失效。
有些WiFi模組可能是WiFi和BT共用電源，這時需要一直保持上電狀態。

power_ctrl_by_pmu;
表示WiFi的電源是否直接通過PMU控制，一般都是用GPIO控制，預設是關閉的。　

power_pmu_regulator = "act_ldo3";
power_pmu_enable_level = <1>; //1->HIGH, 0->LOW
PMU輸出口以及有效電平

vref_ctrl_enable;
在模組不工作(模組上的所有功能晶片都不工作)的情況下切斷 IO參考電壓輸出,以此來降低一定的系統功耗。這個是可選配置並非所有硬體都支援,也不是所有WiFi模組都支援。

WIFI,poweren_gpio = <&gpio4 GPIO_D4 GPIO_ACTIVE_HIGH>;
gpio控制WiFi Power

WIFI,host_wake_irq = <&gpio4 GPIO_D6 GPIO_ACTIVE_HIGH>;
WiFi中斷腳的配置,某些WiFi模組沒有這個腳可以不用配置，AP6335需要配置。

SDIO部分：

&sdio {
        clock-frequency = <50000000>;
        clock-freq-min-max = <200000 50000000>;
        supports-highspeed;
        supports-sdio;
        ignore-pm-notify;
        keep-power-in-suspend;
        //cap-sdio-irq;
        status = "okay";
};

屬性說明見
kernel/Documentation/devicetree/bindings/mmc/rockchip-dw-mshc.txt

• clock-frequency: Stable clk freq for data transfer
• clock-freq-min-max: Host issue slave devices for timing supportted ranges from this clk gap
• supports-highspeed: Indicate if this controller support highspeed mode or not
• supports-emmc: Indicate this controller works as emmc
• supports-sd: Indicate this controller works as sd/mmc card
• supports-sdio: Indicate this controller works as sdio function(card)
• ignore-pm-notify: Indicate this controller will ignore pm notify
• keep-power-in-suspend: Indicate this controller should keep power in system suspend

參考：

kernel/Documentation/devicetree/bindings/mmc/rockchip-dw-mshc.txt
RK 3.10版本Kernel WiFi&BT_開發配置參考說明_for_Android5.0.pdf