Re: [PATCH 1/4] power: supply: add support for max77759 fuel gauge

["André Draszik" <andre.draszik@linaro.org>]

On Tue, 2024-12-03 at 06:47 +0000, André Draszik wrote:
> Hi Thomas,
> 
> Thanks for looking into this!
> 
> > From: Thomas Antoine <t.antoine@uclouvain.be>
> > 
> > The Maxim max77759 fuel gauge has the same interface as the Maxim max1720x
> > except for the non-volatile memory slave address which is not available.
> 
> It is not fully compatible, and it also has a lot more registers.
> 
> For example, the voltage now is not in register 0xda as this driver assumes.
> With these changes, POWER_SUPPLY_PROP_VOLTAGE_NOW just reads as 0. 0xda
> doesn't exist in max77759
> 
> I haven't compared in depth yet, though.

Regarding the regmap in this driver, please see below comparison I had
collected some time ago:

	regmap_reg_range(0x24, 0x26), // exists
	regmap_reg_range(0x30, 0x31), // exists
	regmap_reg_range(0x33, 0x34), // exists
	regmap_reg_range(0x37, 0x37), // exists
	regmap_reg_range(0x3B, 0x3C), // exists
	regmap_reg_range(0x40, 0x41), // exists
	regmap_reg_range(0x43, 0x44), // exists
	regmap_reg_range(0x47, 0x49), // exists
	regmap_reg_range(0x4B, 0x4C), // exists
	regmap_reg_range(0x4E, 0xAF), // 0x4e 0x4f exists
	regmap_reg_range(0xB1, 0xB3), // exists
	regmap_reg_range(0xB5, 0xB7), // exists
	regmap_reg_range(0xBF, 0xD0), // 0xd0 exists
	0xd1 .. 0xdb don't exist
	regmap_reg_range(0xDB, 0xDB),
	regmap_reg_range(0xE0, 0xFF), // 0xfb 0xff exist

the comments refer to whether or not the register exists in max77759

> 
> > No slave is available at address 0xb of the i2c bus, which is coherent
> > with the following driver from google: line 5836 disables non-volatile
> > memory for m5 gauge.
> > 
> > Link:
> > https://android.googlesource.com/kernel/google-modules/bms/+/1a68c36bef474573cc8629cc1d121eb6a81ab68c/max1720x_battery.c
> > 
> > Add support for the max77759 by allowing to use the non-volatile
> > memory or not based on the chip. Value for RSense comes from the following
> > stock devicetree:
> > 
> > Link:
> > https://android.googlesource.com/kernel/devices/google/gs101/+/33eca36d43da6c2b6a546806eb3e7411bbe6d60d/dts/gs101-raviole-battery.dtsi
> > 
> > Signed-off-by: Thomas Antoine <t.antoine@uclouvain.be>
> > ---
> >  drivers/power/supply/max1720x_battery.c | 71 +++++++++++++++++++++++++++-
> > -----
> >  1 file changed, 59 insertions(+), 12 deletions(-)
> > 
> > diff --git a/drivers/power/supply/max1720x_battery.c
> > b/drivers/power/supply/max1720x_battery.c
> > index
> > 33105419e2427bb37963bda9948b647c239f8faa..faf336938dd4306dd2ceeb0a84b90ca8
> > 0ad41a9f 100644
> > --- a/drivers/power/supply/max1720x_battery.c
> > +++ b/drivers/power/supply/max1720x_battery.c
> > @@ -13,6 +13,7 @@
> >  #include <linux/nvmem-provider.h>
> >  #include <linux/power_supply.h>
> >  #include <linux/regmap.h>
> > +#include <linux/types.h>
> 
> Please keep file names in alphabetical order.

Ignore that, it's too early :-)



Cheers,
Andre'