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power: supply: core: Add support for supplied-from device-property 

On devicetree using platforms the devicetree can provide info on which
power-supplies supply another power-supply through phandles.

This commit adds support for providing this info on non devicetree
platforms through the platform code setting a supplied-from
device-property on the power-supplies parent device.

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.co.uk>
This commit is contained in:
Hans de Goede 2017-05-08 17:13:54 +02:00 committed by Sebastian Reichel
parent a463182031
commit 58a36bb068
1 changed files with 23 additions and 1 deletions
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24
drivers/power/supply/power_supply_core.c
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@ -274,8 +274,30 @@ static int power_supply_check_supplies(struct power_supply *psy)
return power_supply_populate_supplied_from(psy);
}
#else
static inline int power_supply_check_supplies(struct power_supply *psy)
static int power_supply_check_supplies(struct power_supply *psy)
{
int nval, ret;
if (!psy->dev.parent)
return 0;
nval = device_property_read_string_array(psy->dev.parent,
"supplied-from", NULL, 0);
if (nval <= 0)
return 0;
psy->supplied_from = devm_kmalloc_array(&psy->dev, nval,
sizeof(char *), GFP_KERNEL);
if (!psy->supplied_from)
return -ENOMEM;
ret = device_property_read_string_array(psy->dev.parent,
"supplied-from", (const char **)psy->supplied_from, nval);
if (ret < 0)
return ret;
psy->num_supplies = nval;
return 0;
}
#endif