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Message-ID: <20241108084130.5y46ot7ajha2oxrj@pengutronix.de>
Date: Fri, 8 Nov 2024 09:41:30 +0100
From: Marco Felsch <m.felsch@...gutronix.de>
To: Frank Li <Frank.Li@....com>
Cc: Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>,
Conor Dooley <conor+dt@...nel.org>,
Jonathan Cameron <jic23@...nel.org>,
Lars-Peter Clausen <lars@...afoo.de>,
Shawn Guo <shawnguo@...nel.org>,
Sascha Hauer <s.hauer@...gutronix.de>,
Pengutronix Kernel Team <kernel@...gutronix.de>,
Fabio Estevam <festevam@...il.com>, devicetree@...r.kernel.org,
imx@...ts.linux.dev, linux-iio@...r.kernel.org,
linux-kernel@...r.kernel.org, Carlos Song <carlos.song@....com>,
Clark Wang <xiaoning.wang@....com>,
linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH 2/3] iio: temperature: Add support for P3T1085
Hi Frank,
thanks for the patch, please see my comments inline.
On 24-11-07, Frank Li wrote:
> From: Carlos Song <carlos.song@....com>
>
> Add basic function support for P3T1085 temperature sensor.
>
> P3T1085UK is a temperature-to-digital converter with a -40 °C to +125 °C
> range. The device can be communicated by a controller via the 2-wire serial
> I3C (up to 12.5 MHz) and I2C (up to 3.4 MHz) interface.
>
> Signed-off-by: Clark Wang <xiaoning.wang@....com>
> Signed-off-by: Carlos Song <carlos.song@....com>
> Signed-off-by: Frank Li <Frank.Li@....com>
> ---
> drivers/iio/temperature/Kconfig | 1 +
> drivers/iio/temperature/Makefile | 2 +
> drivers/iio/temperature/p3t/Kconfig | 29 +++++++++++
> drivers/iio/temperature/p3t/Makefile | 5 ++
> drivers/iio/temperature/p3t/p3t1085.h | 31 ++++++++++++
> drivers/iio/temperature/p3t/p3t1085_core.c | 79 ++++++++++++++++++++++++++++++
> drivers/iio/temperature/p3t/p3t1085_i2c.c | 68 +++++++++++++++++++++++++
> drivers/iio/temperature/p3t/p3t1085_i3c.c | 59 ++++++++++++++++++++++
> 8 files changed, 274 insertions(+)
>
> diff --git a/drivers/iio/temperature/Kconfig b/drivers/iio/temperature/Kconfig
> index 1244d8e17d504..7cdd49279aba2 100644
> --- a/drivers/iio/temperature/Kconfig
> +++ b/drivers/iio/temperature/Kconfig
> @@ -182,4 +182,5 @@ config MCP9600
> This driver can also be built as a module. If so, the module
> will be called mcp9600.
>
> +source "drivers/iio/temperature/p3t/Kconfig"
> endmenu
> diff --git a/drivers/iio/temperature/Makefile b/drivers/iio/temperature/Makefile
> index 07d6e65709f7f..d5e89c20d58b6 100644
> --- a/drivers/iio/temperature/Makefile
> +++ b/drivers/iio/temperature/Makefile
> @@ -19,3 +19,5 @@ obj-$(CONFIG_TMP007) += tmp007.o
> obj-$(CONFIG_TMP117) += tmp117.o
> obj-$(CONFIG_TSYS01) += tsys01.o
> obj-$(CONFIG_TSYS02D) += tsys02d.o
> +
> +obj-y += p3t/
> diff --git a/drivers/iio/temperature/p3t/Kconfig b/drivers/iio/temperature/p3t/Kconfig
> new file mode 100644
> index 0000000000000..09e925024b66f
> --- /dev/null
> +++ b/drivers/iio/temperature/p3t/Kconfig
> @@ -0,0 +1,29 @@
> +# SPDX-License-Identifier: GPL-2.0-only
> +
> +config IIO_P3T1085
> + tristate
> + depends on (I2C || I3C)
> +
> +config IIO_P3T1085_I2C
> + tristate "NXP P3T1085 temperature sensor I2C driver"
> + depends on I2C
> + select IIO_P3T1085
> + select REGMAP_I2C
> + help
> + Say yes here to build support for NXP P3T1085 I2C temperature
> + sensor.
> +
> + To compile this driver as a module, choose M here: the module
> + will be called p3t1085_i2c
> +
> +config IIO_P3T1085_I3C
> + tristate "NXP P3T1085 temperature sensor I3C driver"
> + depends on I3C
> + select IIO_P3T1085
> + select REGMAP_I3C
> + help
> + Say yes here to build support for NXP P3T1085 I3C temperature
> + sensor.
> +
> + To compile this driver as a module, choose M here: the module
> + will be called p3t1085_i3c
> diff --git a/drivers/iio/temperature/p3t/Makefile b/drivers/iio/temperature/p3t/Makefile
> new file mode 100644
> index 0000000000000..21aaeb51e044d
> --- /dev/null
> +++ b/drivers/iio/temperature/p3t/Makefile
> @@ -0,0 +1,5 @@
> +# SPDX-License-Identifier: GPL-2.0-only
> +
> +obj-$(CONFIG_IIO_P3T1085) += p3t1085_core.o
> +obj-$(CONFIG_IIO_P3T1085_I2C) += p3t1085_i2c.o
> +obj-$(CONFIG_IIO_P3T1085_I3C) += p3t1085_i3c.o
> diff --git a/drivers/iio/temperature/p3t/p3t1085.h b/drivers/iio/temperature/p3t/p3t1085.h
> new file mode 100644
> index 0000000000000..b018a04e4aee4
> --- /dev/null
> +++ b/drivers/iio/temperature/p3t/p3t1085.h
> @@ -0,0 +1,31 @@
> +/* SPDX-License-Identifier: GPL-2.0-only */
> +/*
> + * NXP P3T1085 Temperature Sensor Driver
> + *
> + * Copyright 2024 NXP
> + */
> +#ifndef P3T1085_H
> +#define P3T1085_H
> +
> +#include <linux/device.h>
> +#include <linux/iio/iio.h>
> +
> +#define P3T1085_REG_TEMP 0x0
This define can be moved into the core since the _i2c nor the _i3c is
uses it.
> +#define P3T1085_REG_CFGR 0x1
> +#define P3T1085_REG_HIGH_LIM 0x2
> +#define P3T1085_REG_LOW_LIM 0x3
> +
> +#define P3T1085_RESOLUTION_10UC 62500
All three defines are not used, please remove it.
> +
> +enum p3t1085_hw_id {
> + P3T1085_ID,
> +};
Is this id really required? We should keep the driver simple for now and
extend it on demand.
> +struct p3t1085_data {
> + struct device *dev;
> + struct regmap *regmap;
> +};
This belongs to the core.c
> +int p3t1085_probe(struct device *dev, int irq, int hw_id, struct regmap *regmap);
^ ^
unsused params
> +
> +#endif /* P3T1085_H */
> diff --git a/drivers/iio/temperature/p3t/p3t1085_core.c b/drivers/iio/temperature/p3t/p3t1085_core.c
> new file mode 100644
> index 0000000000000..4b00e606a6d04
> --- /dev/null
> +++ b/drivers/iio/temperature/p3t/p3t1085_core.c
> @@ -0,0 +1,79 @@
> +// SPDX-License-Identifier: GPL-2.0-only
> +/*
> + * NXP P3T1085 Temperature Sensor Driver
> + *
> + * Copyright 2024 NXP
> + */
> +#include <linux/bitops.h>
> +#include <linux/err.h>
> +#include <linux/i2c.h>
> +#include <linux/iio/iio.h>
> +#include <linux/iio/sysfs.h>
> +#include <linux/kernel.h>
> +#include <linux/limits.h>
> +#include <linux/module.h>
> +#include <linux/regmap.h>
> +#include <linux/types.h>
> +
> +#include "p3t1085.h"
> +
> +static int p3t1085_read_raw(struct iio_dev *indio_dev,
> + struct iio_chan_spec const *channel, int *val,
> + int *val2, long mask)
> +{
> + struct p3t1085_data *data = iio_priv(indio_dev);
> + int ret;
> +
> + switch (mask) {
> + case IIO_CHAN_INFO_RAW:
> + ret = regmap_read(data->regmap, P3T1085_REG_TEMP, val);
> + if (ret < 0) {
> + dev_err(data->dev, "failed to read temperature register\n");
> + return ret;
> + }
> + *val = *val >> 4;
> + return IIO_VAL_INT;
> +
> + default:
> + return -EINVAL;
> + }
> +}
> +
> +static const struct iio_chan_spec p3t1085_channels[] = {
> + {
> + .type = IIO_TEMP,
> + .info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
> + },
> +};
> +
> +static const struct iio_info p3t1085_info = {
> + .read_raw = p3t1085_read_raw,
> +};
> +
> +int p3t1085_probe(struct device *dev, int irq, int hw_id, struct regmap *regmap)
^ ^
As written abvoe, both params are unused so can you please drop them?
> +{
> + struct p3t1085_data *data;
> + struct iio_dev *iio_dev;
> +
> + iio_dev = devm_iio_device_alloc(dev, sizeof(*data));
> + if (!iio_dev)
> + return -ENOMEM;
> +
> + data = iio_priv(iio_dev);
> + data->dev = dev;
> + data->regmap = regmap;
> +
> + iio_dev->name = "p3t1085";
> + iio_dev->modes = INDIO_DIRECT_MODE;
> + iio_dev->info = &p3t1085_info;
> +
> + iio_dev->channels = p3t1085_channels;
> + iio_dev->num_channels = ARRAY_SIZE(p3t1085_channels);
> +
> + return devm_iio_device_register(dev, iio_dev);
> +}
> +EXPORT_SYMBOL_NS(p3t1085_probe, IIO_P3T1085);
> +
> +MODULE_AUTHOR("Xiaoning Wang <xiaoning.wang@....com>");
> +MODULE_DESCRIPTION("NXP P3T1085 driver");
> +MODULE_LICENSE("GPL");
> diff --git a/drivers/iio/temperature/p3t/p3t1085_i2c.c b/drivers/iio/temperature/p3t/p3t1085_i2c.c
> new file mode 100644
> index 0000000000000..20e5f7a68dd9e
> --- /dev/null
> +++ b/drivers/iio/temperature/p3t/p3t1085_i2c.c
> @@ -0,0 +1,68 @@
> +// SPDX-License-Identifier: GPL-2.0-only
> +/*
> + * NXP P3T1085 Temperature Sensor Driver
> + *
> + * Copyright 2024 NXP
> + */
> +
> +#include <linux/i2c.h>
> +#include <linux/kernel.h>
> +#include <linux/module.h>
> +#include <linux/regmap.h>
> +#include <linux/slab.h>
> +
> +#include "p3t1085.h"
> +
> +static const struct regmap_config p3t1085_i2c_regmap_config = {
> + .reg_bits = 8,
> + .val_bits = 16,
> +};
> +
> +static int p3t1085_i2c_probe(struct i2c_client *client)
> +{
> + const struct i2c_device_id *id;
> + struct regmap *regmap;
> + int ret;
> +
> + id = i2c_client_get_device_id(client);
> + if (!id)
> + return -EINVAL;
At the moment only one devices is supported therefore I would like drop
passing the id to the p3t1085_probe function.
> + regmap = devm_regmap_init_i2c(client, &p3t1085_i2c_regmap_config);
> + if (IS_ERR(regmap))
> + return dev_err_probe(&client->dev, PTR_ERR(regmap),
> + "Failed to register i2c regmap %ld\n", PTR_ERR(regmap));
> +
> + ret = p3t1085_probe(&client->dev, client->irq, id->driver_data, regmap);
> + if (ret)
> + return dev_err_probe(&client->dev, ret, "Failed to probe\n");
> +
> + return 0;
> +}
> +
> +static const struct of_device_id p3t1085_i2c_of_match[] = {
> + { .compatible = "nxp,p3t1085", },
> + { }
> +};
> +MODULE_DEVICE_TABLE(of, p3t1085_i2c_of_match);
> +
> +static const struct i2c_device_id p3t1085_i2c_id_table[] = {
> + { "p3t1085", P3T1085_ID },
^
This can be dropped
> + { }
> +};
> +MODULE_DEVICE_TABLE(i2c, p3t1085_i2c_id_table);
> +
> +static struct i2c_driver p3t1085_driver = {
> + .driver = {
> + .name = "p3t1085_i2c",
> + .of_match_table = p3t1085_i2c_of_match,
> + },
> + .probe = p3t1085_i2c_probe,
> + .id_table = p3t1085_i2c_id_table,
> +};
> +module_i2c_driver(p3t1085_driver);
> +
> +MODULE_AUTHOR("Xiaoning Wang <xiaoning.wang@....com>");
> +MODULE_DESCRIPTION("NXP P3T1085 i2c driver");
> +MODULE_LICENSE("GPL");
> +MODULE_IMPORT_NS(IIO_P3T1085);
> diff --git a/drivers/iio/temperature/p3t/p3t1085_i3c.c b/drivers/iio/temperature/p3t/p3t1085_i3c.c
> new file mode 100644
> index 0000000000000..0007d79aa0a6d
> --- /dev/null
> +++ b/drivers/iio/temperature/p3t/p3t1085_i3c.c
> @@ -0,0 +1,59 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * NXP P3T1085 Temperature Sensor Driver
> + *
> + * Copyright 2024 NXP
> + */
> +#include <linux/kernel.h>
> +#include <linux/mod_devicetable.h>
> +#include <linux/module.h>
> +#include <linux/i3c/device.h>
> +#include <linux/i3c/master.h>
> +#include <linux/slab.h>
> +#include <linux/regmap.h>
> +
> +#include "p3t1085.h"
> +
> +static const struct i3c_device_id p3t1085_i3c_ids[] = {
> + I3C_DEVICE(0x011B, 0x1529, (void *)P3T1085_ID),
^
here as well.
> + { /* sentinel */ },
Nit: Can you please align your "sentinel" style. Either with or without
the comment. Also the of_device_id is missing for the i3c case.
> +};
> +MODULE_DEVICE_TABLE(i3c, p3t1085_i3c_ids);
> +
> +static int p3t1085_i3c_probe(struct i3c_device *i3cdev)
> +{
> + const struct regmap_config p3t1085_i3c_regmap_config = {
> + .reg_bits = 8,
> + .val_bits = 16,
> + };
Please align the style with the i2c module.
> + int ret;
> +
> + const struct i3c_device_id *id = i3c_device_match_id(i3cdev,
> + p3t1085_i3c_ids);
Same here, we don't need to consider different ids yet.
> + struct regmap *regmap;
> +
> + regmap = devm_regmap_init_i3c(i3cdev, &p3t1085_i3c_regmap_config);
> + if (IS_ERR(regmap))
> + return dev_err_probe(&i3cdev->dev, PTR_ERR(regmap),
> + "Failed to register i3c regmap\n");
> +
> + ret = p3t1085_probe(&i3cdev->dev, 0, (uintptr_t)id->data, regmap);
> + if (ret)
> + return dev_err_probe(&i3cdev->dev, ret, "Failed to probe\n");
> +
> + return 0;
> +}
> +
> +static struct i3c_driver p3t1085_driver = {
> + .driver = {
> + .name = "p3t1085_i3c",
> + },
> + .probe = p3t1085_i3c_probe,
> + .id_table = p3t1085_i3c_ids,
> +};
> +module_i3c_driver(p3t1085_driver);
> +
> +MODULE_AUTHOR("Xiaoning Wang <xiaoning.wang@....com>");
> +MODULE_DESCRIPTION("NXP p3t1085 i3c driver");
> +MODULE_LICENSE("GPL");
> +MODULE_IMPORT_NS(IIO_P3T1085);
>
> --
> 2.34.1
>
>
>
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