BQ27220: I look for Linux driver for bq27220

Hong Seongsoo

Part Number: BQ27220
Other Parts Discussed in Thread: BQ27200, BQ27210, BQ27500, BQ27510, BQ27541, BQ27426, BQ27Z561, BQ28Z610, BQ34Z100, BQ78Z100

I look for Linux driver for bq27220

The Linux driver BQ27XXX provided by TI does not include BQ27220.
Where should I get the Linux drivers for BQ27220?

thank you

over 2 years ago

0 Shirish over 2 years ago

TI__Guru 57697 points

The bq27xxx driver works for bq27220 (reading information). If you are looking to write to data memory, then it is not a part of the driver because of security risks. The datasheet is the best reference for the commands.

0 Hong Seongsoo over 2 years ago in reply to Shirish

Prodigy 40 points

Dear Shlrish

Is there a replacement that is compatible with bq27220 and supports Linux drivers?

and

What is correct value string for compatible field in device tree?

To enable bq27220 in linux kernel, there are two things to do before compile kernel.

1. Enable feature in kernel menu config.

- CONFIG_BATTERY_BQ27XXX

- CONFIG_BATTERY_BQ27XXX_I2C

2. Add device tree as below.

(Just an example of modification of my old driver)

&i2c0 {

...

bat: battery {

compatible = "simple-battery";

voltage-min-design-microvolt = <3200000>;

energy-full-design-microwatt-hours = <17787000>;

charge-full-design-microamp-hours = <4900000>;

};

bq27220@55 {

compatible = "ti,bq27220";

reg = <0x55>;

monitored-battery = <&bat>;

};

...

};

But in the kernel source file, "drivers/power/supply/bq27xxx_battery_i2c.c", "bq27220" does not exist.

(Code snipets of bq27xxx_battery_i2c.c)

static const struct of_device_id bq27xxx_battery_i2c_of_match_table[] = {

{ .compatible = "ti,bq27200" },

{ .compatible = "ti,bq27210" },

{ .compatible = "ti,bq27500" },

{ .compatible = "ti,bq27510" },

{ .compatible = "ti,bq27520" },

{ .compatible = "ti,bq27500-1" },

{ .compatible = "ti,bq27510g1" },

{ .compatible = "ti,bq27510g2" },

{ .compatible = "ti,bq27510g3" },

{ .compatible = "ti,bq27520g1" },

{ .compatible = "ti,bq27520g2" },

{ .compatible = "ti,bq27520g3" },

{ .compatible = "ti,bq27520g4" },

{ .compatible = "ti,bq27521" },

{ .compatible = "ti,bq27530" },

{ .compatible = "ti,bq27531" },

{ .compatible = "ti,bq27541" },

{ .compatible = "ti,bq27542" },

{ .compatible = "ti,bq27546" },

{ .compatible = "ti,bq27742" },

{ .compatible = "ti,bq27545" },

{ .compatible = "ti,bq27411" },

{ .compatible = "ti,bq27421" },

{ .compatible = "ti,bq27425" },

{ .compatible = "ti,bq27426" },

{ .compatible = "ti,bq27441" },

{ .compatible = "ti,bq27621" },

{ .compatible = "ti,bq27z561" },

{ .compatible = "ti,bq28z610" },

{ .compatible = "ti,bq34z100" },

{ .compatible = "ti,bq78z100" },

{},

};

As you replied, if linux kernel source support bq27220, then what is the value string for compatible field in device tree?

thank you

0 Shirish over 2 years ago in reply to Hong Seongsoo

TI__Guru 57697 points

You can choose bq27210. The commands are the same

0 Hong Seongsoo over 2 years ago in reply to Shirish

Prodigy 40 points

Dear Shirish, thank you about your kind answer.

I think BQ27210 and BQ27220 are not compatible. Which means, linux driver for bq27210 is not comatible for bq27220.

But, Commands for SOC for bq27220 are 0x2C and 0x2D.

But, Commands for Flag for bq27220 are 0x0A and 0x0B.

Unit of temperature for bq27210 is 0.25 degree kelvin and for bq27220 is 0.1 degree kelvin.

Please, check compatibility again.

thank you.

0 Shirish over 2 years ago in reply to Hong Seongsoo

TI__Guru 57697 points

Hello Hong,

I will check and get back to you

0 Shirish over 2 years ago in reply to Shirish

TI__Guru 57697 points

Hello Hong,

The bq27541 has the same commands as bq27220 for RSOC and Flags. Normally the device in the same series has same commands, but in this case it is not that way.

Power management

Power management forum

BQ27220: I look for Linux driver for bq27220