MT6765中断处理IO口配置流程

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1 添加EINT_VAR
alps/vender/mediated/proprietary/scripts/dct/ 目录下文件　YuSu.cmp，EINT_YuSu.cmp, GPIO_YuSu.cmp
添加　IRQ_M300 和GPIO_IRQ_M300_PIN

２　运行
  alps/vender/mediated/proprietary/scripts/dct/DrvGen

分别打开下面三个问题，相同配置：

alps/kernel-4.9/drivers/misc/mediatek/dws/mt6765/k62v1_64_bsp.dws

alps/vendor/mediatek/proprietary/bootable/bootloader/lk/target/k62v1_64_bsp/dct/dct/codegen.dws

alps/vendor/mediatek/proprietary/bootable/bootloader/preloader/custom/k62v1_64_bsp/dct/dct/codegen.dws

  在GPIO配置界面设置对应的GPIO为中断模式，mapping到GPIO_IRQ_M300_PIN，在EINT配置界面设置对于的EINT　mapping到IRQ_M300

 3 配置DTS

(1) 打开mt6765.dts,添加

        m300_int: m300_int {
                compatible = "mediatek,irq_m300-eint";
        };
  
 (2) 打开k62v1_64_bsp.dts,添加
  &i2c2{
        m300: m300@30 {
                compatible = "ecp,m300";
                reg = <0x30>;
                status = "okay";
                clock-frequency = <400000>;
                m300,interrupt-gpios = <&pio 111 0>;
                m300,enable-gpios = <&pio 51 0>;
        };
};

4 关键驱动注册：

int irq = 0;
irq_gpio = of_get_named_gpio_flags(np, "m300,interrupt-gpios", 0, &flags);
gpio_request(irq_gpio, "m300 irq gpio");
gpio_direction_input(irq_gpio);
irq  = gpio_to_irq(irq_gpio);
request_threaded_irq(irq,  NULL, m300_irq_handler, 
                        IRQF_TRIGGER_FALLING |IRQF_ONESHOT, "m300_interrupt", (void *)data);

enable_irq(data->irq);//使能中断

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