Donate to e Foundation | Murena handsets with /e/OS | Own a part of Murena! Learn more

Commit f6c4c69c authored by Abhijeet Dharmapurikar's avatar Abhijeet Dharmapurikar
Browse files

power: smb135x-charger: support external battery thermistor bias voltage 



smb135x charger chips can accept an external supply for thermistor
biasing. Add code to enable that external regulator if present.

Change-Id: Ie6691cf3eca6c2dc85f438819f7436b44c9c2aca
Signed-off-by: default avatarAbhijeet Dharmapurikar <adharmap@codeaurora.org>
parent 1f4dd82d

Documentation/devicetree/bindings/power/smb135x-charger.txt

+3 −0
Original line number Diff line number Diff line
@@ -46,6 +46,9 @@ Optional Properties: 
					the float voltage compensation needs to be disabled to avoid

					that reverse boost.

- regulator-name			A string used as a descriptive name for OTG regulator.

- therm-bias-supply			The supply that provides bias voltage to the battery

					thermistor. This is useful in designs that do not use the SYSON

					pin to bias the thermistor.



Example:

	i2c@f9967000 {

drivers/power/smb135x-charger.c

+25 −0
Original line number Diff line number Diff line
@@ -269,6 +269,7 @@ struct smb135x_chg { 
	u32				workaround_flags;

	bool				soft_vfloat_comp_disabled;

	struct mutex			irq_complete;

	struct regulator		*therm_bias_vreg;

};



static int smb135x_read(struct smb135x_chg *chip, int reg,
@@ -1825,6 +1826,14 @@ static int smb135x_hw_init(struct smb135x_chg *chip) 
	int i;

	u8 reg, mask, dc_cur_val;



	if (chip->therm_bias_vreg) {

		rc = regulator_enable(chip->therm_bias_vreg);

		if (rc) {

			pr_err("Couldn't enable therm-bias rc = %d\n", rc);

			return rc;

		}

	}



	rc = smb135x_enable_volatile_writes(chip);

	if (rc < 0) {

		dev_err(chip->dev, "Couldn't configure for volatile rc = %d\n",
@@ -2189,6 +2198,15 @@ static int smb_parse_dt(struct smb135x_chg *chip) 


	chip->soft_vfloat_comp_disabled = of_property_read_bool(node,

					"qcom,soft-vfloat-comp-disabled");



	if (of_find_property(node, "therm-bias-supply", NULL)) {

		/* get the thermistor bias regulator */

		chip->therm_bias_vreg = devm_regulator_get(chip->dev,

							"therm-bias");

		if (IS_ERR(chip->therm_bias_vreg))

			return PTR_ERR(chip->therm_bias_vreg);

	}



	return 0;

}
@@ -2417,8 +2435,15 @@ free_regulator: 


static int smb135x_charger_remove(struct i2c_client *client)

{

	int rc;

	struct smb135x_chg *chip = i2c_get_clientdata(client);



	if (chip->therm_bias_vreg) {

		rc = regulator_disable(chip->therm_bias_vreg);

		if (rc)

			pr_err("Couldn't disable therm-bias rc = %d\n", rc);

	}



	debugfs_remove_recursive(chip->debug_root);



	if (chip->dc_psy_type != -EINVAL)