power: bq24735-charger: add 'ti,external-control' option

Implement an 'ti,external-control' option for when the charger
shouldn't be configured by the host.

Signed-off-by: Jonathan Tinkham <[e-mail]>
Signed-off-by: Sebastian Reichel <[e-mail]>

drivers/power/bq24735-charger.c

···
 
 static inline int bq24735_enable_charging(struct bq24735 *charger)
 {
+	if (charger->pdata->ext_control)
+		return 0;
+
 	return bq24735_update_word(charger->client, BQ24735_CHG_OPT,
 				   BQ24735_CHG_OPT_CHARGE_DISABLE,
 				   ~BQ24735_CHG_OPT_CHARGE_DISABLE);
···
 
 static inline int bq24735_disable_charging(struct bq24735 *charger)
 {
+	if (charger->pdata->ext_control)
+		return 0;
+
 	return bq24735_update_word(charger->client, BQ24735_CHG_OPT,
 				   BQ24735_CHG_OPT_CHARGE_DISABLE,
 				   BQ24735_CHG_OPT_CHARGE_DISABLE);
···
 	struct bq24735_platform *pdata = charger->pdata;
 	int ret;
 	u16 value;
+
+	if (pdata->ext_control)
+		return 0;
 
 	if (pdata->charge_current) {
 		value = pdata->charge_current & BQ24735_CHARGE_CURRENT_MASK;
···
 	ret = of_property_read_u32(np, "ti,input-current", &val);
 	if (!ret)
 		pdata->input_current = val;
+
+	pdata->ext_control = of_property_read_bool(np, "ti,external-control");
 
 	return pdata;
 }

include/linux/power/bq24735-charger.h

···
 	int status_gpio_active_low;
 	bool status_gpio_valid;
 
+	bool ext_control;
+
 	char **supplied_to;
 	size_t num_supplicants;
 };