Message-ID: <YvSiuElc/LM5g7hl@ubuntu>
Date:   Wed, 10 Aug 2022 23:33:28 -0700
From:   Matt Ranostay <mranostay@...com>
To:     Lee Jones <lee@...nel.org>
CC:     <nm@...com>, <linux-rtc@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <devicetree@...r.kernel.org>, Keerthy <j-keerthy@...com>
Subject: Re: [PATCH 2/4] MFD: TPS6594x: Add new mfd device for TPS6594x PMIC

On Wed, Aug 10, 2022 at 12:27:25PM +0100, Lee Jones wrote:
> On Thu, 04 Aug 2022, Matt Ranostay wrote:
> 
> > From: Keerthy <j-keerthy@...com>
> > 
> > The TPS6594x chip is a PMIC, and contains the following components:
> > 
> > - Regulators
> > - GPIO controller
> > - RTC
> > 
> > However initially only RTC is supported.
> > 
> > Signed-off-by: Keerthy <j-keerthy@...com>
> > Signed-off-by: Matt Ranostay <mranostay@...com>
> > ---
> >  drivers/mfd/Kconfig          |  14 +++++
> >  drivers/mfd/Makefile         |   1 +
> >  drivers/mfd/tps6594x.c       | 106 +++++++++++++++++++++++++++++++++++
> >  include/linux/mfd/tps6594x.h |  66 ++++++++++++++++++++++
> >  4 files changed, 187 insertions(+)
> >  create mode 100644 drivers/mfd/tps6594x.c
> >  create mode 100644 include/linux/mfd/tps6594x.h
> > 
> > diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig
> > index abb58ab1a1a4..cfb5b3d66b76 100644
> > --- a/drivers/mfd/Kconfig
> > +++ b/drivers/mfd/Kconfig
> > @@ -1547,6 +1547,20 @@ config MFD_TI_LP873X
> >  	  This driver can also be built as a module. If so, the module
> >  	  will be called lp873x.
> >  
> > +config MFD_TPS6594X
> > +	tristate "TI TPS6594X Power Management IC"
> > +	depends on I2C
> > +	select MFD_CORE
> > +	select REGMAP_I2C
> > +	help
> > +	  If you say yes here then you get support for the TPS6594X series of
> > +	  Power Management Integrated Circuits (PMIC).
> > +	  These include voltage regulators, RTS, configurable
> > +	  General Purpose Outputs (GPO) that are used in portable devices.
> > +
> > +	  This driver can also be built as a module. If so, the module
> > +	  will be called tps7694x.
> > +
> >  config MFD_TI_LP87565
> >  	tristate "TI LP87565 Power Management IC"
> >  	depends on I2C && OF
> > diff --git a/drivers/mfd/Makefile b/drivers/mfd/Makefile
> > index 858cacf659d6..7ff6a8a57d55 100644
> > --- a/drivers/mfd/Makefile
> > +++ b/drivers/mfd/Makefile
> > @@ -105,6 +105,7 @@ obj-$(CONFIG_MFD_TPS65910)	+= tps65910.o
> >  obj-$(CONFIG_MFD_TPS65912)	+= tps65912-core.o
> >  obj-$(CONFIG_MFD_TPS65912_I2C)	+= tps65912-i2c.o
> >  obj-$(CONFIG_MFD_TPS65912_SPI)  += tps65912-spi.o
> > +obj-$(CONFIG_MFD_TPS6594X)	+= tps6594x.o
> >  obj-$(CONFIG_MENELAUS)		+= menelaus.o
> >  
> >  obj-$(CONFIG_TWL4030_CORE)	+= twl-core.o twl4030-irq.o twl6030-irq.o
> > diff --git a/drivers/mfd/tps6594x.c b/drivers/mfd/tps6594x.c
> > new file mode 100644
> > index 000000000000..519162cc1fbe
> > --- /dev/null
> > +++ b/drivers/mfd/tps6594x.c
> > @@ -0,0 +1,106 @@
> > +// SPDX-License-Identifier: GPL-2.0-or-later
> > +/*
> > + * tps6594x.c  --  TI TPS6594x chip family multi-function driver
> 
> No filenames in comments please.
> 
> Also, there are too many spaces around the '--'.
> 
> It's not a "multi-function driver" it's a PMIC Core driver.
>

Noted. Will change to PMIC core driver to be more concise.

> > + * Copyright (C) 2022 Texas Instruments Incorporated - https://www.ti.com/
> > + *
> > + * Author: Keerthy <j-keerthy@...com>
> > + */
> > +
> > +#include <linux/interrupt.h>
> > +#include <linux/mfd/core.h>
> > +#include <linux/module.h>
> > +#include <linux/of_device.h>
> > +#include <linux/i2c.h>
> > +#include <linux/regmap.h>
> 
> Alphabetical.
> 
> > +#include <linux/mfd/tps6594x.h>
> > +
> > +static const struct regmap_config tps6594x_regmap_config = {
> > +	.reg_bits = 8,
> > +	.val_bits = 8,
> > +	.max_register = TPS6594X_REG_MAX,
> > +};
> > +
> > +static const struct mfd_cell tps6594x_cells[] = {
> > +	{ .name = "tps6594x-rtc", },
> > +};
> 
> Where are the rest of the devices?
> 
> This is not an MFD with only one device.

There are other devices, however there isn't any drivers currently for them
just the RTC. Should there be placeholders for the gpio, and regulators even
if support currently doesn't exist.

> 
> > +static struct tps6594x *tps;
> > +
> > +static void tps6594x_power_off(void)
> > +{
> > +	regmap_write(tps->regmap, TPS6594X_FSM_NSLEEP_TRIGGERS, 0x3);
> > +	regmap_write(tps->regmap, TPS6594X_INT_STARTUP, 0xff);
> > +	regmap_write(tps->regmap, TPS6594X_INT_MISC, 0xff);
> > +	regmap_write(tps->regmap, TPS6594X_CONFIG_1, 0xc0);
> > +	regmap_write(tps->regmap, TPS6594X_FSM_I2C_TRIGGERS, 0x1);
> 
> No magic numbers please.  Define all of those values.
>

Will add some defines for the bitmasking to make more clear.

> > +}
> > +
> > +static int tps6594x_probe(struct i2c_client *client,
> > +			const struct i2c_device_id *ids)
> > +{
> > +	struct tps6594x *tps6594;
> 
> *ddata is preferred.
> 
> > +	int ret;
> > +	unsigned int otpid;
> > +	struct device_node *node = client->dev.of_node;
> 
> Re-order these - usually 'structs' go first, then ints.
> 
> > +	tps6594 = devm_kzalloc(&client->dev, sizeof(*tps6594), GFP_KERNEL);
> > +	if (!tps6594)
> > +		return -ENOMEM;
> > +
> > +	tps6594->dev = &client->dev;
> > +
> > +	tps6594->regmap = devm_regmap_init_i2c(client, &tps6594x_regmap_config);
> > +	if (IS_ERR(tps6594->regmap)) {
> > +		ret = PTR_ERR(tps6594->regmap);
> > +		dev_err(tps6594->dev,
> > +			"Failed to initialize register map: %d\n", ret);
> > +		return ret;
> > +	}
> > +
> > +	ret = regmap_read(tps6594->regmap, TPS6594X_REG_DEV_REV, &otpid);
> > +	if (ret) {
> > +		dev_err(tps6594->dev, "Failed to read OTP ID\n");
> > +		return ret;
> > +	}
> > +
> > +	tps6594->rev = otpid;
> > +
> > +	i2c_set_clientdata(client, tps6594);
> > +
> > +	ret = mfd_add_devices(tps6594->dev, PLATFORM_DEVID_AUTO, tps6594x_cells,
> > +			      ARRAY_SIZE(tps6594x_cells), NULL, 0, NULL);
> > +
> > +	tps = tps6594;
> > +	if (of_property_read_bool(node, "ti,system-power-controller"))
> > +		pm_power_off = tps6594x_power_off;
> 
> You setting this up even if mfd_add_devices() fails?
> 
> Seems wrong.
> 

Good catch.. yes it shouldn't be setup in that case.

> > +	return ret;
> > +}
> > +
> > +static const struct of_device_id of_tps6594x_match_table[] = {
> > +	{ .compatible = "ti,tps6594x", },
> > +	{}
> > +};
> > +MODULE_DEVICE_TABLE(of, of_tps6594x_match_table);
> > +
> > +static const struct i2c_device_id tps6594x_id_table[] = {
> > +	{ "tps6594x", 0 },
> > +	{ },
> > +};
> > +MODULE_DEVICE_TABLE(i2c, tps6594x_id_table);
> 
> Remove this and use .probe_new instead please.
> 
> > +static struct i2c_driver tps6594x_driver = {
> > +	.driver	= {
> > +		.name	= "tps6594x",
> > +		.of_match_table = of_tps6594x_match_table,
> > +	},
> > +	.probe		= tps6594x_probe,
> > +	.id_table	= tps6594x_id_table,
> > +};
> > +module_i2c_driver(tps6594x_driver);
> > +
> > +MODULE_AUTHOR("J Keerthy <j-keerthy@...com>");
> > +MODULE_DESCRIPTION("TPS6594X chip family Multi-Function Device driver");
> 
> Not an MFD.
> 
> > +MODULE_LICENSE("GPL");
> > diff --git a/include/linux/mfd/tps6594x.h b/include/linux/mfd/tps6594x.h
> > new file mode 100644
> > index 000000000000..41349f96f013
> > --- /dev/null
> > +++ b/include/linux/mfd/tps6594x.h
> > @@ -0,0 +1,66 @@
> > +/* SPDX-License-Identifier: GPL-2.0-or-later */
> > +/*
> > + * tps6594x.h  --  TI TPS6594x
> 
> No filenames.
> 

Noted.

> > + * Copyright (C) 2016 Texas Instruments Incorporated - https://www.ti.com/
> 
> 2016?

>From internal tree likely, but copyrights should be updated.

> 
> > + */
> > +
> > +#ifndef __LINUX_MFD_TPS6594X_H
> > +#define __LINUX_MFD_TPS6594X_H
> 
> Any reason go keep the LINUX part?
> 

Nope not any real reason.

> > +#include <linux/bits.h>
> > +
> > +/* TPS6594x chip id list */
> 
> "ID"
> 
> > +#define TPS6594X			0x00
> > +
> > +/* All register addresses */
> > +#define TPS6594X_REG_DEV_REV			0x01
> > +#define TPS6594X_INT_STARTUP			0x65
> > +#define TPS6594X_INT_MISC			0x66
> > +#define TPS6594X_CONFIG_1			0x7d
> > +#define TPS6594X_FSM_I2C_TRIGGERS		0x85
> > +#define TPS6594X_FSM_NSLEEP_TRIGGERS		0x86
> > +
> > +#define TPS6594X_RTC_SECONDS			0xb5
> > +#define TPS6594X_RTC_MINUTES			0xb6
> > +#define TPS6594X_RTC_HOURS			0xb7
> > +#define TPS6594X_RTC_DAYS			0xb8
> > +#define TPS6594X_RTC_MONTHS			0xb9
> > +#define TPS6594X_RTC_YEARS			0xba
> > +#define TPS6594X_RTC_WEEKS			0xbb
> > +#define TPS6594X_ALARM_SECONDS			0xbc
> > +#define TPS6594X_ALARM_MINUTES			0xbd
> > +#define TPS6594X_ALARM_HOURS			0xbe
> > +#define TPS6594X_ALARM_DAYS			0xbf
> > +#define TPS6594X_ALARM_MONTHS			0xc0
> > +#define TPS6594X_ALARM_YEARS			0xc1
> > +#define TPS6594X_RTC_CTRL_1			0xc2
> > +#define TPS6594X_RTC_CTRL_2			0xc3
> > +#define TPS6594X_RTC_STATUS			0xc4
> > +#define TPS6594X_RTC_INTERRUPTS			0xc5
> > +#define TPS6594X_REG_MAX			0xd0
> > +
> > +/* Register field definitions */
> > +#define TPS6594X_DEV_REV_DEV_ID			0xff
> > +
> > +#define TPS6594X_RTC_CTRL_REG_GET_TIME		BIT(6)
> > +#define TPS6594X_RTC_CTRL_REG_STOP_RTC		BIT(0)
> > +#define TPS6594X_RTC_INTERRUPTS_REG_IT_ALARM	BIT(3)
> > +
> > +#define TPS6594X_RTC_STATUS_RUN			BIT(1)
> > +
> > +/**
> > + * struct tps6594x - state holder for the tps6594x driver
> > + * @dev: struct device pointer for MFD device
> > + * @rev: revision of the tps6594x
> > + * @lock: lock guarding the data structure
> > + * @regmap: register map of the tps6594x PMIC
> > + *
> > + * Device data may be used to access the TPS6594X chip
> > + */
> > +struct tps6594x {
> > +	struct device *dev;
> > +	u8 rev;
> > +	struct regmap *regmap;
> > +};
> 
> Please test compile with W=1 enabled and fix the issues.
>

Thanks,

Matt

> > +#endif /* __LINUX_MFD_TPS6594X_H */
> 
> -- 
> Lee Jones [李琼斯]

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