玩转移远SC60 Android开发板------（6）去掉PMI芯片

布满荆棘的人生 2023-01-12 01:48 292阅读 0赞

SC60模块使用的是高通MSM8953套片，对应使用的电源芯片是PM8953和PMI632。  
其中PM8953包括如下功能：  
 ◆ Input power management  
 ◆ Output power management  
 ◆ General HK  
 ◆ Audio  
 ◆ IC interfaces  
 ◆ Configurable pins:either multipurpose pins (MPPs) or general-purpose input/output (GPIOs)  
而PMI632主要包括了如下功能：  
 ◆ Switching charger  
 ◆ Qualcomm battery gauge  
 ◆ Type-C and Micro USB connectors support  
 ◆ Quick Charge 2.0 and Quick Charge 3.0 support  
 ◆ Battery current limiting (BCL) module  
 ◆ General housekeeping  
 ◆ Analog to digital converter (ADC)  
 ◆ Battery interface module (BIM)  
 ◆ Red, green, blue (RGB) LED drivers, PBS pattern generator(PPG)  
 ◆ Vibrator driver  
 ◆ Qualcomm® camera flash  
 ◆ LCD bias  
 ◆ HR-LED  
 ◆ GPIOs that can be configured to function within some of the other categories  
  在不使用充电、FG 电量计、充电指示、闪光灯驱动、背光驱动、马达驱动、电池 ID 和电池温度检测的前提下，可以去掉PMI芯片的。

这里主要的修改就是USB。默认有PMI的模块，vbus脚是连接在PMI侧的，现在需要连接到PM8953的GPIO-7作为vbus插入检测，使用MSM8953的GPIO\_1作为USB ID检测。参考图如下：  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2Nvcm5lcnN0b25lMQ_size_16_color_FFFFFF_t_70]  
Usb3.0的主从设备检测是通过CC1和CC2控制USB\_ID,再通过USB\_ID输出，通知GPIO\_1来实现：当插入device时，USB\_ID会输出低电平，GPIO\_1收到后，通知模块进入host模式；如不需要OTG功能，USB¬\_ID脚可悬空。

驱动修改主要是增加extcon1节点了。

//stone added for usb-detect
    &soc {
        
    	usb_detect {
        
    		compatible = "linux,extcon-usb-gpio";
    		vbus-gpio = <&pm8953_gpios 7 GPIO_ACTIVE_HIGH>;
    
    		pinctrl-names = "default";
    		pinctrl-0 = <&usb2_vbus_det_default>;
    	};
    };
    
    &pm8953_gpios {
        
    //shiyan added for usb-detect
    	gpio@c600 {
         
    		qcom,mode = <0>; 
    		qcom,vin-sel = <3>; /*reference voltage 1.8v*/ 
    		qcom,src-sel = <0>; 
    		qcom,pull = <5>; /*no pull. */ 
    		qcom,master-en = <1>; 
    		status = "okay"; 
    	}; 
    	usb2_vbus_det {
        
    		usb2_vbus_det_default: usb2_vbus_det_default {
        
    			pins = "gpio7";
    			function = "normal";
    			input-enable;
    			bias-pull-down;
    			power-source = <1>;	/* VPH input supply */
    		};
    	};
    };
    
    +//stone added for usb-detect 3
    +&soc {
        
    +	usb_detect: usb_detect {
        
    +		compatible = "linux,extcon-usb-gpio";
    +		vbus-gpio = <&pm8953_gpios 7 GPIO_ACTIVE_HIGH>;
    +
    +		pinctrl-names = "default";
    +		pinctrl-0 = <&usb2_vbus_det_default>;
    +	};
    +};
    +
    +&soc {
        
    +	id_detect: id_detect {
        
    +		compatible = "linux,extcon-usb-gpio";
    +		id-gpio = <&tlmm 1 GPIO_ACTIVE_HIGH>;
    +
    +		pinctrl-names = "default";
    +		pinctrl-0 = <&id_gpio_detect>;
    +	};
    +};
    +
    +//stone added for usb-detect 4
    +&usb3 {
        
    +	extcon1 = <&usb_detect>, <&id_detect>;
    +	//if we only need support MicroUSB
    +	//qcom,connector-type-uAB;
    +};
    +

对应的驱动在  
kernel/msm-4.9/drivers/extcon/extcon-usb-gpio.c  
kernel/msm-4.9/drivers/extcon/extcon.c  
kernel/msm-4.9/drivers/usb/dwc3/dwc3-msm.c这里使用新的extcon1，也需要修改：

+#ifdef CONFIG_EXTCON_USB_GPIO
    +	if (of_property_read_bool(node, "extcon1"))
    +	{
        
    +		if (of_count_phandle_with_args(node, "extcon1", NULL) > start_idx + 1) {
        
    +			edev = extcon_get_edev_by_phandle(mdwc->dev, start_idx + 1);
    +			if (IS_ERR(edev) && PTR_ERR(edev) != -ENODEV) {
        
    +				ret = PTR_ERR(edev);
    +				goto err;
    +			}
    +		}
    +	}
    +
    +	else
    +	{
        
    +		if (of_count_phandle_with_args(node, "extcon", NULL) > start_idx + 1) {
        
    +			edev = extcon_get_edev_by_phandle(mdwc->dev, start_idx + 1);
    +			if (IS_ERR(edev) && PTR_ERR(edev) != -ENODEV) {
        
    +				ret = PTR_ERR(edev);
    +				goto err;
    +			}
    +		}
    +	}
    +#else
     	if (of_count_phandle_with_args(node, "extcon", NULL) > start_idx + 1) {
        
     		edev = extcon_get_edev_by_phandle(mdwc->dev, start_idx + 1);
     		if (IS_ERR(edev) && PTR_ERR(edev) != -ENODEV) {
        
    @@ -3090,6 +3117,7 @@ static int dwc3_msm_extcon_register(struct dwc3_msm *mdwc, int start_idx)
     			goto err;
     		}
     	}
    +#endif

如上配置后使用extcon驱动，是可以正常检测到vbus插入中断的，usb2.0以及type-C的device和otg模式都是正常的。

[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2Nvcm5lcnN0b25lMQ_size_16_color_FFFFFF_t_70]: /images/20221119/618df2b46e71409cb3c4af879309985c.png