A100 tina pwm7 PI6 测试

[tigger]

board.dts：

                pio: pinctrl@0300b000 {
...
                        pwm7_pin_a: pwm7@0 {
                                allwinner,pins = "PI6";
                                allwinner,function = "pwm7";
                                allwinner,muxsel = <0x04>;
                                allwinner,drive = <0x2>;
                                allwinner,pull = <0>;
                                allwinner,data = <0xffffffff>;
                        };

                        pwm7_pin_b: pwm7@1 {
                                allwinner,pins = "PI6";
                                allwinner,function = "io_disabled";
                                allwinner,muxsel = <0x07>;
                                allwinner,drive = <0x2>;
                                allwinner,pull = <0>;
                                allwinner,data = <0xffffffff>;
                        };
...

                pwm7: pwm7@0300a000 {
                        pinctrl-names = "active", "sleep";
                        pinctrl-0 = <&pwm7_pin_a>;
                        pinctrl-1 = <&pwm7_pin_b>;
                        status = "okay"
                };

.config 配置：

CONFIG_PWM=y
CONFIG_PWM_SYSFS=y
CONFIG_PWM_SUNXI_GROUP=y

[tigger]

用io翻转测试pwm：

echo 262 > /sys/class/gpio/export
echo out > /sys/class/gpio/gpio262/direction
while [ 1 ]; do echo 1 > /sys/class/gpio/gpio262/value ;echo 0 > /sys/class/gpio/gpio262/value ;   done;

[tigger]

使能pwm7：

echo 7 > /sys/class/pwm/pwmchip0/export
echo 25000000 > /sys/class/pwm/pwmchip0/pwm7/period
echo 12000000 > /sys/class/pwm/pwmchip0/pwm7/duty_cycle
echo 1 > /sys/class/pwm/pwmchip0/pwm7/enable

查看pwm信息：

mount -t debugfs none /sys/kernel/debug;
cat /sys/kernel/debug/pwm

# cat /sys/kernel/debug/pwm
platform/300a000.pwm, 16 PWM devices
 pwm-0   ((null)              ): period: 0 ns duty: 0 ns polarity: normal
 pwm-1   ((null)              ): period: 0 ns duty: 0 ns polarity: normal
 pwm-2   ((null)              ): period: 0 ns duty: 0 ns polarity: normal
 pwm-3   ((null)              ): period: 0 ns duty: 0 ns polarity: normal
 pwm-4   ((null)              ): period: 0 ns duty: 0 ns polarity: normal
 pwm-5   ((null)              ): period: 0 ns duty: 0 ns polarity: normal
 pwm-6   ((null)              ): period: 0 ns duty: 0 ns polarity: normal
 pwm-7   (sysfs               ): requested enabled period: 25000000 ns duty: 12000000 ns polarity: normal
 pwm-8   ((null)              ): period: 0 ns duty: 0 ns polarity: normal
 pwm-9   ((null)              ): period: 0 ns duty: 0 ns polarity: normal
 pwm-10  ((null)              ): period: 0 ns duty: 0 ns polarity: normal
 pwm-11  ((null)              ): period: 0 ns duty: 0 ns polarity: normal
 pwm-12  ((null)              ): period: 0 ns duty: 0 ns polarity: normal
 pwm-13  ((null)              ): period: 0 ns duty: 0 ns polarity: normal
 pwm-14  ((null)              ): period: 0 ns duty: 0 ns polarity: normal
 pwm-15  ((null)              ): period: 0 ns duty: 0 ns polarity: normal