需求：全志T507，把PI12、PI13复用为PWM2、PWM3，想要让PWM2、3互补输出。
T507手册上支持pwm互补输出
看源码需要在设备树里面配置"bind_pwm"和"dead_time"，获取死区时间和“互补输出绑定的pwm？？”，这里的bind_pwm不是很理解。
static int sunxi_pwm_get_config(struct platform_device *pdev, struct sunxi_pwm_config *config)
{
struct device_node *np = pdev->dev.of_node;
int ret = 0;
/* read register config */
pr_info("sunxi_pwm_get_config %s\n", np->name);
ret = of_property_read_u32(np, "bind_pwm", &config->bind_pwm);
if (ret < 0) {
/*if there is no bind pwm,set 255, dual pwm invalid!*/
config->bind_pwm = 255;
ret = 0;
}
ret = of_property_read_u32(np, "dead_time", &config->dead_time);
if (ret < 0) {
/*if there is bind pwm, but not set dead time,set bind pwm 255,dual pwm invalid!*/
config->bind_pwm = 255;
ret = 0;
}
pr_info("bind_pwm=%d,dead_time=%d\n", config->bind_pwm, config->dead_time);
ret = of_property_read_u32(np, "clk_bypass_output", &config->clk_bypass_output);
if (ret < 0) {
/*if use pwm as the internal clock source!*/
config->clk_bypass_output = 0;
ret = 0;
}
of_node_put(np);
return ret;
}
static int sunxi_pwm_config(struct pwm_chip *chip, struct pwm_device *pwm,
int duty_ns, int period_ns)
{
int bind_num;
struct sunxi_pwm_chip *pc = to_sunxi_pwm_chip(chip);
//这里可以根据bind_num选择是否互补输出
bind_num = pc->config[pwm->pwm - chip->base].bind_pwm;
if (bind_num == 255)
sunxi_pwm_config_single(chip, pwm, duty_ns, period_ns);
else
sunxi_pwm_config_dual(chip, pwm, duty_ns, period_ns, bind_num);
return 0;
}
但是按照源码里面增加“bind_pwm”和“dead_time”
pwm2: pwm2@0300a000 {
pinctrl-names = "active", "sleep";
pinctrl-0 = <&pwm2_pin_a>;
pinctrl-1 = <&pwm2_pin_b>;
bind_pwm = 2;
dead_time = 1000;
status = "okay";
};
编译报错
Error: arch/arm64/boot/dts/sunxi/CII-Common.dtsi:543.15-16 syntax error
FATAL ERROR: Unable to parse input tree
make[2]: *** [scripts/Makefile.lib:313: arch/arm64/boot/dts/sunxi/board.dtb] Error 1
make[1]: *** [scripts/Makefile.build:648: arch/arm64/boot/dts/sunxi] Error 2
make: *** [arch/arm64/Makefile:153: dtbs] Error 2
make: *** Waiting for unfinished jobs....
CHK kernel/config_data.h
ERROR: build kernel Failed
INFO: mkkernel failed
请问怎么配置才能让pwm互补输出？