On some devices the USB Type-C port power (USB PD 2.0) negotiation is
done by a separate port-controller IC, while the current limit is
controlled through another (charger) IC.

It has been decided to model this by modelling the external Type-C
power brick (adapter/charger) as a power-supply class device which
supplies the charger-IC, with its voltage-now and current-max representing
the negotiated voltage and max current draw.

This commit adds support for this to the bq24190_charger driver by calling
power_supply_set_input_current_limit_from_supplier helper if the
"input-current-limit-from-supplier" device-property is set.

Note this replaces the functionality to get the current-limit from an
extcon device, which will be removed in a follow-up commit.

Signed-off-by: Hans de Goede <hdego...@redhat.com>
---
 drivers/power/supply/bq24190_charger.c | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/drivers/power/supply/bq24190_charger.c 
b/drivers/power/supply/bq24190_charger.c
index d78e2c6dc127..1f6424f0772f 100644
--- a/drivers/power/supply/bq24190_charger.c
+++ b/drivers/power/supply/bq24190_charger.c
@@ -161,6 +161,7 @@ struct bq24190_dev_info {
        char                            model_name[I2C_NAME_SIZE];
        bool                            initialized;
        bool                            irq_event;
+       bool                            input_current_limit_from_supplier;
        struct mutex                    f_reg_lock;
        u8                              f_reg;
        u8                              ss_reg;
@@ -1137,6 +1138,14 @@ static int bq24190_charger_property_is_writeable(struct 
power_supply *psy,
        return ret;
 }
 
+static void bq24190_charger_external_power_changed(struct power_supply *psy)
+{
+       struct bq24190_dev_info *bdi = power_supply_get_drvdata(psy);
+
+       if (bdi->input_current_limit_from_supplier)
+               power_supply_set_input_current_limit_from_supplier(psy);
+}
+
 static enum power_supply_property bq24190_charger_properties[] = {
        POWER_SUPPLY_PROP_CHARGE_TYPE,
        POWER_SUPPLY_PROP_HEALTH,
@@ -1165,6 +1174,7 @@ static const struct power_supply_desc 
bq24190_charger_desc = {
        .get_property           = bq24190_charger_get_property,
        .set_property           = bq24190_charger_set_property,
        .property_is_writeable  = bq24190_charger_property_is_writeable,
+       .external_power_changed = bq24190_charger_external_power_changed,
 };
 
 /* Battery power supply property routines */
@@ -1654,6 +1664,10 @@ static int bq24190_probe(struct i2c_client *client,
                return -EINVAL;
        }
 
+       bdi->input_current_limit_from_supplier =
+               device_property_read_bool(dev,
+                                         "input-current-limit-from-supplier");
+
        /*
         * Devicetree platforms should get extcon via phandle (not yet 
supported).
         * On ACPI platforms, extcon clients may invoke us with:
-- 
2.13.3

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