README.md

Introduction

This is uio Linux driver for T113-S3 PWM sub system.

Build and deploy

1. build

   export KBUILDDIR=<KERNEL BUILD DIR>
   export ARCH=arm
   export CROSS_COMPILE=arm-none-eabi-
   make

2. Copy sun20i-pwm-uio.ko to proper directory in target rootfs (e.g. /lib/modules/6.6.47/kernel/drivers/pwm/)
3. run depmod -a in target to update module.alias and module.dep

DTS

In order to instantiate this driver, add following lines to sun8i-t113s-mangopi-mq-r-t113.dts file.
We need pinctrl to configure PWM pins for this kernel module.

&pio {
    /omit-if-no-ref/
	pwm2_pe8_pin: pwm2-pe8-pin {
        pins = "PE8";
        function = "pwm2";
    };

	/omit-if-no-ref/
	pwm3_pe9_pin: pwm3-pe9-pin {
        pins = "PE9";
        function = "pwm3";
    };

	/omit-if-no-ref/
	pwm4_pe10_pin: pwm4-pe10-pin {
        pins = "PE10";
        function = "pwm4";
    };

	/omit-if-no-ref/
	pwm5_pe13_pin: pwm5-pe13-pin {
        pins = "PE13";
        function = "pwm5";
    };
};

&soc {
    pwm_uio: pwm_uio@2000c00 {
        compatible = "allwinner,sun20i-pwm-uio";
        reg = <0x2000c00 0x400>;
        interrupts = <GIC_SPI 18 IRQ_TYPE_LEVEL_HIGH>;
        clocks = <&ccu CLK_BUS_PWM>, <&dcxo>;
        clock-names = "bus", "mod";
        resets = <&ccu RST_BUS_PWM>;
        pinctrl-0 = <&pwm2_pe8_pin>, 
                    <&pwm3_pe9_pin>,
                    <&pwm4_pe10_pin>,
                    <&pwm5_pe13_pin>;
        pinctrl-names = "default";
    };
};