Hi Vinay,
Cc: linux-arm-msm
On 10/30/18 4:12 PM, Vinay Simha B N wrote:
> hi,
>
> we are using 410c with apq8016 based board, want to configure mpp3 as
> output and mpp4 as input. How to set the output voltage level(mpp3) by
> runtime and read the analog input voltage(mpp4) in sysfs. please suggest.
>
> debian based linux kernel - 4.14
> added arch/arm64/boot/dts/qcom/pm8916.dtsi
>
> pm8916_vadc: vadc@3100 {
> mpp4_in {
> reg = <VADC_P_MUX4_1_1>;
> qcom,decimation = <512>;
> qcom,ratiometric; //0.625V and 1.25V
> reference
> qcom,hw-settle-time = <200>;
> qcom,avg-samples = <1>;
> qcom,pre-scaling = <1 1>;
> };
>
> in apq8016-sbc-pmic-pins.dtsi
> ----------
> &pm8916_mpps {
>
> pinctrl-names = "default";
> pinctrl-0 = <&pm8916_mpp_analog_out &pm8916_mpp_analog_in>;
>
> pm8916_mpp_analog_in: pm8916_mpp4 {
> pinconf {
> pins = "mpp4";
> function = "analog";
> qcom,amux-route = <PMIC_MPP_AMUX_ROUTE_CH5>;
> };
> };
> pm8916_mpp_analog_out: pm8916_mpp_analog {
> pinconf {
> pins = "mpp3";
> function = "analog";
> qcom,analog-level = <PMIC_MPP_AOUT_LVL_1V25>;
> output-high;
> };
> };
> ------------
>
> cat /sys/kernel/debug/gpio
> gpiochip2: GPIOs 504-507, parent: platform/200f000.spmi:pm8916@0:mpps@a000,
> 200f000.spmi:pm8916@0:mpps@a000:
> mpp1 : out analog vin-2 0 high
> mpp2 : out digital vin-0 0 low
> mpp3 : out analog vin-0 0 low
> mpp4 : in analog vin-0 0 low
>
--
regards,
Stan
