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Commit fe41af3d authored by Guru Das Srinagesh's avatar Guru Das Srinagesh
Browse files

pwm: qti-lpg: Read tick duration via device tree 



Tick duration defines the tick duration (in microseconds) for the clock
that PPG uses which is used to program the ramp step duration for the
pattern. If unspecified, the default value is 7800 us.

Change-Id: I7cd96d74a39becffbf9a008610c0092ad2462446
Signed-off-by: default avatarGuru Das Srinagesh <gurus@codeaurora.org>
parent 6d56178c

drivers/pwm/pwm-qti-lpg.c

+8 −2
Original line number Diff line number Diff line
@@ -173,6 +173,7 @@ struct qpnp_lpg_lut { 
	enum ppg_num_nvmems	nvmem_count;

	u32			reg_base;

	u32			*pattern; /* patterns in percentage */

	u32			ramp_step_tick_us;

};



struct qpnp_lpg_channel {
@@ -550,8 +551,8 @@ static int qpnp_lpg_set_sdam_ramp_config(struct qpnp_lpg_channel *lpg) 
		return rc;

	}



	/* Set ramp step duration, one WAIT_TICK is 7.8ms */

	val = (ramp->step_ms * 1000 / 7800) & 0xff;

	/* Set ramp step duration, in ticks */

	val = (ramp->step_ms * 1000 / lpg->chip->lut->ramp_step_tick_us) & 0xff;

	if (val > 0)

		val--;

	addr = SDAM_REG_RAMP_STEP_DURATION;
@@ -1549,6 +1550,7 @@ static int qpnp_lpg_get_nvmem_dt(struct qpnp_lpg_chip *chip) 
	return rc;

}



#define DEFAULT_TICK_DURATION_US	7800

static int qpnp_lpg_parse_dt(struct qpnp_lpg_chip *chip)

{

	int rc = 0, i;
@@ -1608,6 +1610,10 @@ static int qpnp_lpg_parse_dt(struct qpnp_lpg_chip *chip) 
			return rc;

		}



		chip->lut->ramp_step_tick_us = DEFAULT_TICK_DURATION_US;

		of_property_read_u32(chip->dev->of_node, "qcom,tick-period-us",

				&chip->lut->ramp_step_tick_us);



		rc = qpnp_lpg_parse_pattern_dt(chip, SDAM_LUT_COUNT_MAX);

		if (rc < 0) {

			of_node_put(chip->pbs_dev_node);