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Commit 2c0437df authored by Jishnu Prakash's avatar Jishnu Prakash
Browse files

iio: qcom-rradc: Add batt_id delay property for RRADC 



Add DT property to set batt_id hardware settling delay time.

Change-Id: I3ca6078d45efdfcec38027586fc5a740aa03f698
Signed-off-by: default avatarJishnu Prakash <jprakash@codeaurora.org>
parent 93bc65b1

Documentation/devicetree/bindings/iio/adc/qcom-rradc.txt

+4 −0
Original line number Diff line number Diff line
@@ -45,6 +45,10 @@ Optional property: 
- qcom,pmic-revid : Phandle pointing to the revision peripheral node. Use it to query the

		    PMIC fabrication ID for applying the appropriate temperature

		    compensation parameters.

- qcom,batt-id-delay-ms :

    Value type: <u32>

    Definition: Used to specify HW settling time in MS for measuring BATT_ID.

            Possible values are: 0, 1, 4, 12, 20, 40, 60, 80.

Example:



	/* RRADC node */

drivers/iio/adc/qcom-rradc.c

+27 −7
Original line number Diff line number Diff line
@@ -199,7 +199,8 @@ 
#define FG_RR_TP_REV_VERSION2		29

#define FG_RR_TP_REV_VERSION3		32



#define BATT_ID_SETTLE_DELAY_80_MS		0xE0

#define BATT_ID_SETTLE_SHIFT		5

#define RRADC_BATT_ID_DELAY_MAX		8



/*

 * The channel number is not a physical index in hardware,
@@ -231,6 +232,7 @@ struct rradc_chip { 
	struct mutex			lock;

	struct regmap			*regmap;

	u16				base;

	int				batt_id_delay;

	struct iio_chan_spec		*iio_chans;

	unsigned int			nchannels;

	struct rradc_chan_prop		*chan_props;
@@ -258,6 +260,8 @@ struct rradc_chan_prop { 
					u16 adc_code, int *result);

};



static const int batt_id_delays[] = {0, 1, 4, 12, 20, 40, 60, 80};



static int rradc_masked_write(struct rradc_chip *rr_adc, u16 offset, u8 mask,

						u8 val)

{
@@ -855,7 +859,7 @@ static int rradc_enable_batt_id_channel(struct rradc_chip *chip, bool enable) 
static int rradc_do_batt_id_conversion(struct rradc_chip *chip,

		struct rradc_chan_prop *prop, u16 *data, u8 *buf)

{

	int rc = 0, ret = 0;

	int rc = 0, ret = 0, batt_id_delay;



	rc = rradc_enable_batt_id_channel(chip, true);

	if (rc < 0) {
@@ -863,11 +867,12 @@ static int rradc_do_batt_id_conversion(struct rradc_chip *chip, 
		return rc;

	}



	if (chip->batt_id_delay != -EINVAL) {

		batt_id_delay = chip->batt_id_delay << BATT_ID_SETTLE_SHIFT;

		rc = rradc_masked_write(chip, FG_ADC_RR_BATT_ID_CFG,

			BATT_ID_SETTLE_DELAY_80_MS, BATT_ID_SETTLE_DELAY_80_MS);

	if (rc < 0) {

				batt_id_delay, batt_id_delay);

		if (rc < 0)

			pr_err("BATT_ID settling time config failed:%d\n", rc);

		ret = rc;

	}



	rc = rradc_masked_write(chip, FG_ADC_RR_BATT_ID_TRIGGER,
@@ -1138,6 +1143,21 @@ static int rradc_get_dt_data(struct rradc_chip *chip, struct device_node *node) 
		return rc;

	}



	chip->batt_id_delay = -EINVAL;



	rc = of_property_read_u32(node, "qcom,batt-id-delay-ms",

			&chip->batt_id_delay);

	if (!rc) {

		for (i = 0; i < RRADC_BATT_ID_DELAY_MAX; i++) {

			if (chip->batt_id_delay == batt_id_delays[i])

				break;

		}

		if (i == RRADC_BATT_ID_DELAY_MAX)

			pr_err("Invalid batt_id_delay, rc=%d\n", rc);

		else

			chip->batt_id_delay = i;

	}



	chip->base = base;

	chip->revid_dev_node = of_parse_phandle(node, "qcom,pmic-revid", 0);

	if (chip->revid_dev_node) {