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Using PMIC PM650l GPIOs as PWM or LPG
clavin.rali
Join Date: 18 Jan 21
Posts: 4
Posted: Mon, 2021-03-29 05:41
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An IR LED is connected  to GPIO_6 of the PMIC pm6150l as in the refernce schematics and the device tree node is

irled {

                irled_pwm: irled_pwm_default {
                        pins = "gpio6";
                        function = "func1";
                        qcom,drive-strength = <2>;
                        power-source = <0>;
                        bias-disable;
                        output-low;
                };
        };
 
By default this IR led is used by the qcom,camera-ir-led driver and the corresponding device tree is shown below,
 
ir_led: camera-ir-led@0 { 
               cell-index = <0>;
               reg = <0x00>;
               compatible = "qcom,camera-ir-led";
               pwms = <&pm6150l_pwm_1  0 0>;
               enable-active-high;
               pinctrl-names = "default", "cam_default", "cam_suspend";
               pinctrl-0 = <&irled_pwm>;
               pinctrl-1 = <&cam_sensor_ir_cut_on>;
               pinctrl-2 = <&cam_sensor_ir_cut_off>;
               gpios = <&tlmm 73 0>,
                       <&tlmm 74 0>;
               qcom,gpio-ir-p = <0>;
               qcom,gpio-ir-m =  <1>;
               qcom,gpio-req-tbl-num = <0 1>;
               qcom,gpio-req-tbl-flags = <0 0>;
               qcom,gpio-req-tbl-label = "IR_CUT_FILTER_P",
                               "IR_CUT_FILTER_M";
               gpio-no-mux = <0>;
               status = "ok";
       };
 
This driver uses pwm which most probably controls the IR LED but I don't want to use qcom,camera-ir-led driver instead I want to configure GPIO_6 of pm6150l as pwm or lpg so as to control the IR led through sysfs. 
 
The technical overview document (80-PL631-500) says that "LPG can be used for HR LED, GPIO, RGB LED, and Haptics". I want to know how to configure the pwm/lpg out to the pmic gpio.
 

 

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