RE: [PATCH V4 2/2] power: supply: bq27xxx: Add support for BQ78Z100

[LI Qingwu <qing-wu.li@leica-geosystems.com.cn>]

Hi Sebastian,

Thanks a lot for your input, I changed according your input in PATCH V5, please review.
About "why 0x00000000 instead of just '0' like in the other entries?", since I got an error from checkpatch.pl.

ERROR: space prohibited before that ',' (ctx:WxW)
#100: FILE: drivers/power/supply/bq27xxx_battery.c:1015:
+       [BQ78Z100]  = BQ27XXX_DATA(bq78z100,  0         , BQ27Z561_O_BITS),
                                                        ^




Best Regards

**********************************************
Li Qingwu (Terry)
Senior Embedded Software Engineer 
Leica Geosystems(Shanghai)Co.,Limited
(Tel): +86 21 61061036
(FAX): +86 21 61061008
(Mobile): +86 187 0185 9600
E-mail: Qing-wu.Li@leica-geosystems.com.cn
Http: www.leica-geosystems.com.cn
**********************************************

-----Original Message-----
From: Sebastian Reichel <sebastian.reichel@collabora.com> 
Sent: Wednesday, March 3, 2021 12:22 AM
To: LI Qingwu <qing-wu.li@leica-geosystems.com.cn>
Cc: robh+dt@kernel.org; dmurphy@ti.com; pali@kernel.org; krzk@kernel.org; linux-pm@vger.kernel.org; devicetree@vger.kernel.org; linux-kernel@vger.kernel.org; TERTYCHNYI Grygorii <grygorii.tertychnyi@leica-geosystems.com>; ZHIZHIKIN Andrey <andrey.zhizhikin@leica-geosystems.com>
Subject: Re: [PATCH V4 2/2] power: supply: bq27xxx: Add support for BQ78Z100

Hi,

On Fri, Feb 05, 2021 at 07:10:04AM +0000, LI Qingwu wrote:
> Add support for TI BQ78Z100, I2C interface gas gauge.
> It provides a fully integrated safety protection and authentication 
> for 1 to 2-series cell Li-Ion and Li-Polymer battery packs.
> 
> The patch was tested with BQ78Z100 equipment.
> 
> Reviewed-by: Krzysztof Kozlowski <krzk@kernel.org>
> Signed-off-by: LI Qingwu <Qing-wu.Li@leica-geosystems.com.cn>
> ---
>  drivers/power/supply/bq27xxx_battery.c     | 46 +++++++++++++++++++++-
>  drivers/power/supply/bq27xxx_battery_i2c.c |  2 +
>  include/linux/power/bq27xxx_battery.h      |  1 +
>  3 files changed, 48 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/power/supply/bq27xxx_battery.c 
> b/drivers/power/supply/bq27xxx_battery.c
> index 315e0909e6a4..c8579ec7a4f8 100644
> --- a/drivers/power/supply/bq27xxx_battery.c
> +++ b/drivers/power/supply/bq27xxx_battery.c
> @@ -39,6 +39,7 @@
>   * https://www.ti.com/product/bq27z561
>   * https://www.ti.com/product/bq28z610
>   * https://www.ti.com/product/bq34z100-g1
> + * https://www.ti.com/product/bq78z100
>   */
>  
>  #include <linux/device.h>
> @@ -497,7 +498,27 @@ static u8
>  		[BQ27XXX_REG_DCAP] = 0x3c,
>  		[BQ27XXX_REG_AP] = 0x22,
>  		BQ27XXX_DM_REG_ROWS,
> -	};
> +	},
> +	bq78z100_regs[BQ27XXX_REG_MAX] = {
> +		[BQ27XXX_REG_CTRL] = 0x00,
> +		[BQ27XXX_REG_TEMP] = 0x06,
> +		[BQ27XXX_REG_INT_TEMP] = 0x28,
> +		[BQ27XXX_REG_VOLT] = 0x08,
> +		[BQ27XXX_REG_AI] = 0x14,
> +		[BQ27XXX_REG_FLAGS] = 0x0a,
> +		[BQ27XXX_REG_TTE] = 0x16,
> +		[BQ27XXX_REG_TTF] = 0x18,
> +		[BQ27XXX_REG_TTES] = INVALID_REG_ADDR,

Datasheet states StandbyTimeToEmpty = 0x1C?

> +		[BQ27XXX_REG_TTECP] = INVALID_REG_ADDR,
> +		[BQ27XXX_REG_NAC] = INVALID_REG_ADDR,

missing BQ27XXX_REG_RC. Looks like chip has support for it at address 0x10.

> +		[BQ27XXX_REG_FCC] = 0x12,
> +		[BQ27XXX_REG_CYCT] = 0x2a,
> +		[BQ27XXX_REG_AE] = 0x22,

REG_AE is available energy. REG_AP is average power. Obviously two completley different things and cannot be the same register.
A quick glance at the datasheet suggests AE does not exist.

> +		[BQ27XXX_REG_SOC] = 0x2c,
> +		[BQ27XXX_REG_DCAP] = 0x3c,
> +		[BQ27XXX_REG_AP] = 0x22,
> +		BQ27XXX_DM_REG_ROWS,
> +};

Please fix indention of };

>  
>  static enum power_supply_property bq27000_props[] = {
>  	POWER_SUPPLY_PROP_STATUS,
> @@ -792,6 +813,27 @@ static enum power_supply_property bq34z100_props[] = {
>  	POWER_SUPPLY_PROP_MANUFACTURER,
>  };
>  
> +static enum power_supply_property bq78z100_props[] = {
> +	POWER_SUPPLY_PROP_STATUS,
> +	POWER_SUPPLY_PROP_PRESENT,
> +	POWER_SUPPLY_PROP_VOLTAGE_NOW,
> +	POWER_SUPPLY_PROP_CURRENT_NOW,
> +	POWER_SUPPLY_PROP_CAPACITY,
> +	POWER_SUPPLY_PROP_CAPACITY_LEVEL,
> +	POWER_SUPPLY_PROP_TEMP,
> +	POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW,
> +	POWER_SUPPLY_PROP_TIME_TO_EMPTY_AVG,

You are not providing data for this? (BQ27XXX_REG_TTECP is not set).
Please revisit the list of exposed properties and provide a dump of /sys/class/power_supply/<your_battery>/uevent in your submission.
Currently you should see some -ENODATA.

> +	POWER_SUPPLY_PROP_TIME_TO_FULL_NOW,
> +	POWER_SUPPLY_PROP_TECHNOLOGY,
> +	POWER_SUPPLY_PROP_CHARGE_FULL,
> +	POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
> +	POWER_SUPPLY_PROP_CYCLE_COUNT,
> +	POWER_SUPPLY_PROP_ENERGY_NOW,
> +	POWER_SUPPLY_PROP_POWER_AVG,
> +	POWER_SUPPLY_PROP_HEALTH,
> +	POWER_SUPPLY_PROP_MANUFACTURER,
> +};
> +
>  struct bq27xxx_dm_reg {
>  	u8 subclass_id;
>  	u8 offset;
> @@ -890,6 +932,7 @@ static struct bq27xxx_dm_reg bq27621_dm_regs[] = {  
> #define bq27z561_dm_regs 0  #define bq28z610_dm_regs 0  #define 
> bq34z100_dm_regs 0
> +#define bq78z100_dm_regs 0
>  
>  #define BQ27XXX_O_ZERO		BIT(0)
>  #define BQ27XXX_O_OTDC		BIT(1) /* has OTC/OTD overtemperature flags */
> @@ -948,6 +991,7 @@ static struct {
>  	[BQ28Z610]  = BQ27XXX_DATA(bq28z610,  0         , BQ27Z561_O_BITS),
>  	[BQ34Z100]  = BQ27XXX_DATA(bq34z100,  0         , BQ27XXX_O_OTDC | BQ27XXX_O_SOC_SI | \
>  							  BQ27XXX_O_HAS_CI | BQ27XXX_O_MUL_CHEM),
> +	[BQ78Z100]  = BQ27XXX_DATA(bq78z100,  0x00000000, BQ27Z561_O_BITS),

why 0x00000000 instead of just '0' like in the other entries?

>  };
>  
>  static DEFINE_MUTEX(bq27xxx_list_lock); diff --git 
> a/drivers/power/supply/bq27xxx_battery_i2c.c 
> b/drivers/power/supply/bq27xxx_battery_i2c.c
> index eb4f4284982f..46f078350fd3 100644
> --- a/drivers/power/supply/bq27xxx_battery_i2c.c
> +++ b/drivers/power/supply/bq27xxx_battery_i2c.c
> @@ -248,6 +248,7 @@ static const struct i2c_device_id bq27xxx_i2c_id_table[] = {
>  	{ "bq27z561", BQ27Z561 },
>  	{ "bq28z610", BQ28Z610 },
>  	{ "bq34z100", BQ34Z100 },
> +	{ "bq78z100", BQ78Z100 },
>  	{},
>  };
>  MODULE_DEVICE_TABLE(i2c, bq27xxx_i2c_id_table); @@ -284,6 +285,7 @@ 
> static const struct of_device_id bq27xxx_battery_i2c_of_match_table[] = {
>  	{ .compatible = "ti,bq27z561" },
>  	{ .compatible = "ti,bq28z610" },
>  	{ .compatible = "ti,bq34z100" },
> +	{ .compatible = "ti,bq78z100" },
>  	{},
>  };
>  MODULE_DEVICE_TABLE(of, bq27xxx_battery_i2c_of_match_table);
> diff --git a/include/linux/power/bq27xxx_battery.h 
> b/include/linux/power/bq27xxx_battery.h
> index 111a40d0d3d5..ac17618043b1 100644
> --- a/include/linux/power/bq27xxx_battery.h
> +++ b/include/linux/power/bq27xxx_battery.h
> @@ -33,6 +33,7 @@ enum bq27xxx_chip {
>  	BQ27Z561,
>  	BQ28Z610,
>  	BQ34Z100,
> +	BQ78Z100,
>  };
>  
>  struct bq27xxx_device_info;

Thanks,

-- Sebastian