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Subject[RFC PATCH 0/4] power_supply: Add DT helper function to get power-supply dev from dt
Date
This patchset add DT helper function to get power-supply device from devicetree.
- of_power_supply_get_dev(struct device *dev, enum power_supply_dev_type type,
int index)
Power-supply class provides 'power_supply_get_by_name()' to users who want to
find power-supply device with the name of power-supply device.

If CONFIG_OF is enabled, device drivers which want to get power-supply device
would directly get the power-supply device from devicetree by using of_power_
supply_get_dev(). This function can be used instead of power_supply_get_by_name().

For example,

[After]
The charger-manager must need the power-supply device of fuelgauge to
read the battery capacity. The charger-manager dt don't need to consider
the name of power-supply device for fuelgauge because of only needing
phandle of fuelgauge power-supply device.

fuelgauge0: max17047@36 {
compatible = "maxim,max17047";
interrupt-parent = <&gpx2>;
interrputs = <3 2>;
reg = <0x36>;
};

charger-manager@0 {
compatible = "charger-manager";
...
fuel-gauge = <&fuelgauge0>; /* Need phandle of fuelgauge
phandle name is always same. */
...
};

[Before]
Previous way use the name of fuelgauge power-supply device to get
fuel-gauge device using power_supply_get_by_name(). If change the name
of fuelgauge device, we have to modify both fuelgauge dt and charger-
manager dt. The charger-manager has dependency on the name of fuel-gague
power-supply device.

max17047@36 {
compatible = "maxim,max17047";
interrupt-parent = <&gpx2>;
interrputs = <3 2>;
reg = <0x36>;
};

charger-manager@0 {
compatible = "charger-manager";
...
cm-fuel-gauge = "max170xx_battery"; /* Need the name of fuel-gauge */
...
};


Chanwoo Choi (4):
power_supply: of: Add an API to get power_supply device from dt node
charger-manager: Get power_supply device using of_power_supply_get_dev()
Documentation: dt: charger-manager: Change the way to get fuel-gauge power-supply device
max17042_battery: Change battery name instead of static name according to device type

.../bindings/power_supply/charger-manager.txt | 8 ++-
drivers/power/Kconfig | 4 ++
drivers/power/Makefile | 2 +
drivers/power/charger-manager.c | 22 ++++--
drivers/power/max17042_battery.c | 2 +-
drivers/power/of_power_supply.c | 82 ++++++++++++++++++++++
include/linux/power/charger-manager.h | 2 +
include/linux/power/of_power_supply.h | 46 ++++++++++++
8 files changed, 159 insertions(+), 9 deletions(-)
create mode 100644 drivers/power/of_power_supply.c
create mode 100644 include/linux/power/of_power_supply.h

--
1.8.0



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