linux-kernel - Re: [PATCH v3 19/23] power: supply: s2dos05: Add fuel gauge driver for s2dos05

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Date: Thu, 20 Jun 2024 18:11:37 +0200
From: Krzysztof Kozlowski <krzk@...nel.org>
To: Dzmitry Sankouski <dsankouski@...il.com>,
 Sebastian Reichel <sre@...nel.org>, Bjorn Andersson <andersson@...nel.org>,
 Michael Turquette <mturquette@...libre.com>, Stephen Boyd
 <sboyd@...nel.org>, Neil Armstrong <neil.armstrong@...aro.org>,
 Jessica Zhang <quic_jesszhan@...cinc.com>, Sam Ravnborg <sam@...nborg.org>,
 Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
 Maxime Ripard <mripard@...nel.org>, Thomas Zimmermann <tzimmermann@...e.de>,
 David Airlie <airlied@...il.com>, Daniel Vetter <daniel@...ll.ch>,
 Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>,
 Conor Dooley <conor+dt@...nel.org>, Lee Jones <lee@...nel.org>,
 Dmitry Torokhov <dmitry.torokhov@...il.com>, Pavel Machek <pavel@....cz>,
 Liam Girdwood <lgirdwood@...il.com>, Mark Brown <broonie@...nel.org>,
 Uwe Kleine-König <ukleinek@...nel.org>,
 Konrad Dybcio <konrad.dybcio@...aro.org>,
 Chanwoo Choi <cw00.choi@...sung.com>, phone-devel@...r.kernel.org
Cc: linux-pm@...r.kernel.org, linux-kernel@...r.kernel.org,
 linux-arm-msm@...r.kernel.org, linux-clk@...r.kernel.org,
 dri-devel@...ts.freedesktop.org, devicetree@...r.kernel.org,
 linux-input@...r.kernel.org, linux-leds@...r.kernel.org,
 linux-pwm@...r.kernel.org, linux-samsung-soc@...r.kernel.org
Subject: Re: [PATCH v3 19/23] power: supply: s2dos05: Add fuel gauge driver
 for s2dos05

On 18/06/2024 15:59, Dzmitry Sankouski wrote:
> Add fuel gauge driver for s2dos05 PMIC. It uses adc to measure power
> on each power output s2dos05 provides, including regulator outputs
> and AVDD, ELVSS, ELVDD lines. Driver registers power supply for each
> corresponding power line.
> 
> Adc can be disabled and enabled via sysfs.
> 


> +
> +static const struct power_supply_desc s2dos05_avdd_fg_desc = {
> +	.name		= "s2dos05_avdd",
> +	.type		= POWER_SUPPLY_TYPE_UNKNOWN,
> +	.get_property	= s2dos05_fg_get_property_avdd,
> +	.properties	= s2dos05_fg_properties,
> +	.num_properties	= ARRAY_SIZE(s2dos05_fg_properties),
> +};
> +
> +static const struct power_supply_desc s2dos05_buck_fg_desc = {
> +	.name		= "s2dos05_buck",
> +	.type		= POWER_SUPPLY_TYPE_UNKNOWN,
> +	.get_property	= s2dos05_fg_get_property_buck,
> +	.properties	= s2dos05_fg_properties,
> +	.num_properties	= ARRAY_SIZE(s2dos05_fg_properties),
> +};

Buck is a regulator. Not power supply.

Entire driver is something odd. NAK.

> +static int s2dos05_fuelgauge_probe(struct platform_device *pdev)
> +{
> +	struct device *dev = &pdev->dev;
> +	struct s2dos_core *iodev = dev_get_drvdata(dev->parent);
> +	struct s2dos05_fg	*drv_data;

Drop redundant spaces.

> +	struct power_supply_config pscfg = {};
> +	int ret;
> +
> +	drv_data = devm_kzalloc(dev, sizeof(struct s2dos05_fg),

Drop 2015 code. Use new drivers as template.

> +							GFP_KERNEL);
> +	if (!drv_data)
> +		ret = -ENOMEM;


> +
> +MODULE_DESCRIPTION("s2dos05 power meter");
> +MODULE_AUTHOR("Dzmitry Sankouski <dsankouski@...il.com>");
> +MODULE_LICENSE("GPL");
> diff --git a/include/linux/mfd/s2dos05.h b/include/linux/mfd/s2dos05.h
> new file mode 100644
> index 000000000000..8d216064bc78
> --- /dev/null
> +++ b/include/linux/mfd/s2dos05.h

Why this is MFD? Squash the header into C code.

> @@ -0,0 +1,123 @@
> +/* SPDX-License-Identifier: GPL-2.0+
> + * s2dos05.h

Drop

> + *
> + * Copyright (c) 2016 Samsung Electronics Co., Ltd
> + *              http://www.samsung.com
> + *
> + */
> +
> +#ifndef __LINUX_MFD_S2DOS05_H
> +#define __LINUX_MFD_S2DOS05_H
> +#include <linux/platform_device.h>
> +#include <linux/regmap.h>
> +
> +#define MFD_DEV_NAME "s2dos05"

Drop

> +
> +struct s2dos05_dev {
> +	struct device *dev;
> +	struct regmap *regmap;
> +};
> +
> +/* S2DOS05 registers */
> +/* Slave Addr : 0xC0 */
> +enum S2DOS05_reg {
> +	S2DOS05_REG_DEV_ID,
> +	S2DOS05_REG_TOPSYS_STAT,
> +	S2DOS05_REG_STAT,
> +	S2DOS05_REG_EN,
> +	S2DOS05_REG_LDO1_CFG,
> +	S2DOS05_REG_LDO2_CFG,
> +	S2DOS05_REG_LDO3_CFG,
> +	S2DOS05_REG_LDO4_CFG,
> +	S2DOS05_REG_BUCK_CFG,
> +	S2DOS05_REG_BUCK_VOUT,
> +	S2DOS05_REG_IRQ_MASK = 0x0D,
> +	S2DOS05_REG_SSD_TSD = 0x0E,
> +	S2DOS05_REG_OCL = 0x10,
> +	S2DOS05_REG_IRQ = 0x11
> +};
> +
> +/* S2DOS05 regulator ids */
> +enum S2DOS05_regulators {

What does it have to do with power supply / fuel gauge?

> +	S2DOS05_LDO1,
> +	S2DOS05_LDO2,
> +	S2DOS05_LDO3,
> +	S2DOS05_LDO4,
> +	S2DOS05_BUCK1,
> +	S2DOS05_REG_MAX,
> +};



Best regards,
Krzysztof