BQ27xxx registers

[Chris Lapa]

Hi,

I'm testing out the 4.9 kernel on a AM3359 board fitted with a 
BQ27510-G3 fuel gauge. The board previously worked on the 4.1 kernel, 
however on the 4.9 kernel the bq27xxx_battery.c driver is spitting out 
this error continuously:

power_supply bq27510-0: driver failed to report `charge_full_design' 
property: -121

I have narrowed down the problem to commit 099867a16 where the 
BQ27XXX_REG_DCAP value was changed from 0x2e to 0x3c.

I can generate a patch to fix this issue, however the bigger problem 
exists as to which revision fuel gauge the bq27xxx_battery.c driver is 
intended to support for each family.

Attached is a table I put together of all the register addresses for 
each supported device under the BQ27500 definition and what the current 
driver utilizes (I didn't paste it here as the word wrapping messes with 
the formatting).

There isn't really an ideal solution I can see where we keep the single 
BQ27500 definition and support all the functionality of each revision.

We can try and just support the latest revisions (BQ27510-G3 and 
BQ27520-G4) but I think it could hurt backwards compatibility for 
existing hardware.

I'm happy to work on a fix but just wanted to get some thoughts before 
proceeding.

Cheers,
Chris
Register		BQ27500/1	BQ27510-G1	BQ27510-G2	BQ27510-G3	BQ27520-G1	BQ27520-G2	BQ27520-G3	BQ27520-G4 	bq27xxx_battery.c
BQ27XXX_REG_CTRL	0x00		0x00		0x00		0x00		0x00		0x00		0x00		0x00		0x00
BQ27XXX_REG_TEMP	0x06		0x06		0x06		0x06		0x06		0x06		0x06		0x06		0x06
BQ27XXX_REG_INT_TEMP	â		-		-		0x28		-		0x36		0x36		0x28		0x28
BQ27XXX_REG_VOLT	0x08		0x08		0x08		0x08		0x08		0x08		0x08		0x08		0x08
BQ27XXX_REG_AI		0x14		0x14		0x14		0x14		0x14		0x14		0x14		0x14		0x14
BQ27XXX_REG_FLAGS	0x0a		0x0a		0x0a		0x0a		0x0a		0x0a		0x0a		0x0a		0x0a
BQ27XXX_REG_TTE		0x16		0x16		0x16		0x16		0x16		0x16		0x16		0x16		0x16
BQ27XXX_REG_TTF		0x18		0x18		0x18		â		0x18		0x18		-		-		-
BQ27XXX_REG_TTES	0x1c		0x1c		0x1c		0x1a		0x1c		0x1c		0x1c		0x1a		0x1a
BQ27XXX_REG_TTECP	0x26		0x26		0x26		-		0x26		0x26		0x26		-		-
BQ27XXX_REG_NAC		0x0c		0x0c		0x0c		0x0c		0x0c		0x0c		0x0c		0x0c		0x0c
BQ27XXX_REG_FCC		0x12		0x12		0x12		0x12		0x12		0x12		0x12		0x12		0x12
BQ27XXX_REG_CYCT	0x2a		0x2a		0x2a		0x1e		-		0x2a		0x2a		0x1e		0x2a
BQ27XXX_REG_AE		0x22		0x22		0x22		-		0x22		0x22		0x22		-		-
BQ27XXX_REG_SOC		0x2c		0x2c		0x2c		0x20		0x2c		0x2c		0x2c		0x20		0x2c
BQ27XXX_REG_DCAP	0x3c		0x3c		0x3c		0x2e		0x3c		0x3c		0x3c		-		0x3c
BQ27XXX_REG_AP		0x24		0x24		0x24		-		0x24		0x24		0x24		-		-