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BWM 配置

BWM 包括以下配置内容：
  1. 内核配置
    Device Drivers
    Misc devices--->
        [*] BWM driver for ArtInChip SoC
  2. DTS 配置
    bwm: bwm@184ff000 {
        compatible ="artinchip,aic-bwm";
        reg = <0x184ff000 0x1000>;
        interrupts = <GIC_SPI 19 IRQ_TYPE_LEVEL_HIGH>;
        clocks = <&cmu CLK_BWM>;
        resets = <&rst RESET_BWM>;
        status ="okay";
};