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Date: Mon, 1 Jul 2024 13:55:06 -0700
From: Guenter Roeck <linux@...ck-us.net>
To: Thomas Weißschuh <thomas@...ch.de>,
Alex Vdovydchenko <keromvp@...il.com>
Cc: Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>,
Conor Dooley <conor+dt@...nel.org>, Sean Anderson <sean.anderson@...ux.dev>,
Jean Delvare <jdelvare@...e.com>, Jonathan Corbet <corbet@....net>,
Delphine CC Chiu <Delphine_CC_Chiu@...ynn.com>, devicetree@...r.kernel.org,
linux-kernel@...r.kernel.org, linux-hwmon@...r.kernel.org,
linux-doc@...r.kernel.org, linux-i2c@...r.kernel.org,
Alex Vdovydchenko <xzeol@...oo.com>
Subject: Re: [PATCH v3 2/2] hwmon: add MP5920 driver
On 7/1/24 13:19, Thomas Weißschuh wrote:
> On 2024-07-01 17:56:01+0000, Alex Vdovydchenko wrote:
>> Add support for MPS Hot-Swap controller mp5920. This driver exposes
>> telemetry and limit value readings and writings.
>>
>> Signed-off-by: Alex Vdovydchenko <xzeol@...oo.com>
>> ---
>> Documentation/hwmon/index.rst | 1 +
>> Documentation/hwmon/mp5920.rst | 91 +++++++++++++++++++++++++++++++++
>> drivers/hwmon/pmbus/Kconfig | 9 ++++
>> drivers/hwmon/pmbus/Makefile | 1 +
>> drivers/hwmon/pmbus/mp5920.c | 93 ++++++++++++++++++++++++++++++++++
>> 5 files changed, 195 insertions(+)
>> create mode 100644 Documentation/hwmon/mp5920.rst
>> create mode 100644 drivers/hwmon/pmbus/mp5920.c
>>
>> diff --git a/Documentation/hwmon/index.rst b/Documentation/hwmon/index.rst
>> index e92a3d5c7..9eba7e402 100644
>> --- a/Documentation/hwmon/index.rst
>> +++ b/Documentation/hwmon/index.rst
>> @@ -168,6 +168,7 @@ Hardware Monitoring Kernel Drivers
>> mp2975
>> mp2993
>> mp5023
>> + mp5920
>> mp5990
>> mp9941
>> mpq8785
>> --- /dev/null
>> +++ b/Documentation/hwmon/mp5920.rst
>> @@ -0,0 +1,91 @@
>> +.. SPDX-License-Identifier: GPL-2.0
>> +
>> +Kernel driver mp5920
>> +====================
>> +
>> +Supported chips:
>> +
>> + * MPS MP5920
>> +
>> + Prefix: 'mp5920'
>> +
>> + * Datasheet
>> +
>> + Publicly available at the MPS website : https://www.monolithicpower.com/en/mp5920.html
>> +
>> +Authors:
>> +
>> + Tony Ao <tony_ao@...ynn.com>
>> + Alex Vdovydchenko <xzeol@...oo.com>
>> +
>> +Description
>> +-----------
>> +
>> +This driver implements support for Monolithic Power Systems, Inc. (MPS)
>> +MP5920 Hot-Swap Controller.
>> +
>> +Device compliant with:
>> +
>> +- PMBus rev 1.3 interface.
>> +
>> +Device supports direct and linear format for reading input voltage,
>> +output voltage, output current, input power and temperature.
>> +
>> +The driver exports the following attributes via the 'sysfs' files
>> +for input voltage:
>> +
>> +**in1_input**
>> +
>> +**in1_label**
>> +
>> +**in1_rated_max**
>> +
>> +**in1_rated_min**
>> +
>> +**in1_crit**
>> +
>> +**in1_alarm**
>> +
>> +The driver provides the following attributes for output voltage:
>> +
>> +**in2_input**
>> +
>> +**in2_label**
>> +
>> +**in2_rated_max**
>> +
>> +**in2_rated_min**
>> +
>> +**in2_alarm**
>> +
>> +The driver provides the following attributes for output current:
>> +
>> +**curr1_input**
>> +
>> +**curr1_label**
>> +
>> +**curr1_crit**
>> +
>> +**curr1_alarm**
>> +
>> +**curr1_rated_max**
>> +
>> +The driver provides the following attributes for input power:
>> +
>> +**power1_input**
>> +
>> +**power1_label**
>> +
>> +**power1_max**
>> +
>> +**power1_rated_max**
>> +
>> +The driver provides the following attributes for temperature:
>> +
>> +**temp1_input**
>> +
>> +**temp1_max**
>> +
>> +**temp1_crit**
>> +
>> +**temp1_alarm**
>> --- a/drivers/hwmon/pmbus/Kconfig
>> +++ b/drivers/hwmon/pmbus/Kconfig
>> @@ -371,6 +371,15 @@ config SENSORS_MP5023
>> This driver can also be built as a module. If so, the module will
>> be called mp5023.
>>
>> +config SENSORS_MP5920
>> + tristate "MPS MP5920"
>> + help
>> + If you say yes here you get hardware monitoring support for Monolithic
>> + MP5920.
>> +
>> + This driver can also be built as a module. If so, the module will
>> + be called mp5920.
>> +
>> config SENSORS_MP5990
>> tristate "MPS MP5990"
>> help
>> --- a/drivers/hwmon/pmbus/Makefile
>> +++ b/drivers/hwmon/pmbus/Makefile
>> @@ -39,6 +39,7 @@ obj-$(CONFIG_SENSORS_MP2888) += mp2888.o
>> obj-$(CONFIG_SENSORS_MP2975) += mp2975.o
>> obj-$(CONFIG_SENSORS_MP2993) += mp2993.o
>> obj-$(CONFIG_SENSORS_MP5023) += mp5023.o
>> +obj-$(CONFIG_SENSORS_MP5920) += mp5920.o
>> obj-$(CONFIG_SENSORS_MP5990) += mp5990.o
>> obj-$(CONFIG_SENSORS_MP9941) += mp9941.o
>> obj-$(CONFIG_SENSORS_MPQ7932) += mpq7932.o
>> --- /dev/null
>> +++ b/drivers/hwmon/pmbus/mp5920.c
>> @@ -0,0 +1,82 @@
>> +// SPDX-License-Identifier: GPL-2.0-or-later
>> +#include <linux/i2c.h>
>> +#include <linux/module.h>
>> +#include <linux/of_device.h>
>> +#include "pmbus.h"
>> +
>> +static struct pmbus_driver_info mp5920_info = {
>> + .pages = 1,
>> + .format[PSC_VOLTAGE_IN] = direct,
>> + .format[PSC_VOLTAGE_OUT] = direct,
>> + .format[PSC_CURRENT_OUT] = direct,
>> + .format[PSC_POWER] = direct,
>> + .format[PSC_TEMPERATURE] = direct,
>> + .m[PSC_VOLTAGE_IN] = 2266,
>> + .b[PSC_VOLTAGE_IN] = 0,
>> + .R[PSC_VOLTAGE_IN] = -1,
>> + .m[PSC_VOLTAGE_OUT] = 2266,
>> + .b[PSC_VOLTAGE_OUT] = 0,
>> + .R[PSC_VOLTAGE_OUT] = -1,
>> + .m[PSC_CURRENT_OUT] = 546,
>> + .b[PSC_CURRENT_OUT] = 0,
>> + .R[PSC_CURRENT_OUT] = -2,
>> + .m[PSC_POWER] = 5840,
>> + .b[PSC_POWER] = 0,
>> + .R[PSC_POWER] = -3,
>> + .m[PSC_TEMPERATURE] = 1067,
>> + .b[PSC_TEMPERATURE] = 20500,
>> + .R[PSC_TEMPERATURE] = -2,
>> + .func[0] = PMBUS_HAVE_VIN | PMBUS_HAVE_VOUT |
>> + PMBUS_HAVE_IOUT | PMBUS_HAVE_POUT |
>> + PMBUS_HAVE_TEMP,
>> +};
>> +
>> +static int mp5920_probe(struct i2c_client *client)
>> +{
>> + struct device *dev = &client->dev;
>> + int ret;
>> + u8 buf[I2C_SMBUS_BLOCK_MAX + 1];
>> +
>> + ret = i2c_smbus_read_block_data(client, PMBUS_MFR_MODEL, buf);
>
> If you do keep a custom call to i2c_smbus_read_block_data(),
> then you probably should also keep the call to i2c_check_functionality().
>
>> + if (ret < 0) {
>> + dev_err(dev, "Failed to read PMBUS_MFR_MODEL\n");
>> + return ret;
>> + }
>
> If you use dev_err_probe() that would be shorter:
>
> if (ret < 0)
> return dev_err_probe(dev, ret, "Failed to read PMBUS_MFR_MODEL\n");
>
>> + if (ret != 6 || strncmp(buf, "MP5920", 6)) {
>> + buf[ret] = '\0';
>> + dev_err(dev, "Model '%s' not supported\n", buf);
>
> The manual 0-byte termination and the size + 1 can be avoided by using
>
> dev_err_probe(dev, -ENODEV, "Model '%.*s' not supported\n", sizeof(buf), buf);
>
>> + return -ENODEV;
>> + }
>> +
>> + return pmbus_do_probe(client, &mp5920_info);
>> +}
>> +
>> +static const struct of_device_id mp5920_of_match[] = {
>> + { .compatible = "mps,mp5920" },
>> + { }
>> +};
>> +
>> +MODULE_DEVICE_TABLE(of, mp5920_of_match);
>> +
>> +static const struct i2c_device_id mp5920_id[] = {
>> + { "mp5920" },
>> + { }
>> +};
>> +
>> +MODULE_DEVICE_TABLE(i2c, mp5920_id);
>> +
>> +static struct i2c_driver mp5920_driver = {
>> + .driver = {
>> + .name = "mp5920",
>> + },
>
> Borked indentation.
> You can also use the shorter variant:
> .driver.name = "mp5920",
>
> Where did the .driver.of_match_table go?
>
I personally prefer the longer version, but, yes,
.driver.of_match_table disappeared. Good catch.
Thanks,
Guenter
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