pwm: jz4740: Allow selection of PWM channels 0 and 1 (a2005fc7) · Commits · 戴 / test

drivers/pwm/pwm-jz4740.c

+14 −5

Original line number	Diff line number	Diff line
		@@ -33,6 +33,19 @@ static inline struct jz4740_pwm_chip to_jz4740(struct pwm_chip chip)
		return container_of(chip, struct jz4740_pwm_chip, chip);
		}

		static bool jz4740_pwm_can_use_chn(struct jz4740_pwm_chip *jz,
		unsigned int channel)
		{
		/* Enable all TCU channels for PWM use by default except channels 0/1 */
		u32 pwm_channels_mask = GENMASK(NUM_PWM - 1, 2);

		device_property_read_u32(jz->chip.dev->parent,
		"ingenic,pwm-channels-mask",
		&pwm_channels_mask);

		return !!(pwm_channels_mask & BIT(channel));
		}

		static int jz4740_pwm_request(struct pwm_chip chip, struct pwm_device pwm)
		{
		struct jz4740_pwm_chip *jz = to_jz4740(chip);
		@@ -40,11 +53,7 @@ static int jz4740_pwm_request(struct pwm_chip chip, struct pwm_device pwm)
		char name[16];
		int err;

		/*
		* Timers 0 and 1 are used for system tasks, so they are unavailable
		* for use as PWMs.
		*/
		if (pwm->hwpwm < 2)
		if (!jz4740_pwm_can_use_chn(jz, pwm->hwpwm))
		return -EBUSY;

		snprintf(name, sizeof(name), "timer%u", pwm->hwpwm);