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Message-ID: <c74beccd-26ea-4e63-906b-bd5508465cbc@roeck-us.net>
Date: Fri, 3 Nov 2023 07:35:51 -0700
From: Guenter Roeck <linux@...ck-us.net>
To: Peter Yin <peteryin.openbmc@...il.com>, patrick@...cx.xyz,
Jean Delvare <jdelvare@...e.com>,
Rob Herring <robh+dt@...nel.org>,
Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
Conor Dooley <conor+dt@...nel.org>,
Jonathan Corbet <corbet@....net>, linux-hwmon@...r.kernel.org,
devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
linux-doc@...r.kernel.org
Subject: Re: [PATCH v1 2/2] hwmon: (pmbus) Add support for MPS Multi-phase
mp5990
On 11/3/23 01:01, Peter Yin wrote:
> Add support for mp5990 device from Monolithic Power Systems, Inc. (MPS)
> vendor. This is a Hot-Swap Controller.
>
> Signed-off-by: Peter Yin <peteryin.openbmc@...il.com>
> ---
> Documentation/hwmon/index.rst | 1 +
> Documentation/hwmon/mp5990.rst | 84 +++++++++++++++++++++++++++++++
> drivers/hwmon/pmbus/Kconfig | 9 ++++
> drivers/hwmon/pmbus/Makefile | 1 +
> drivers/hwmon/pmbus/mp5990.c | 90 ++++++++++++++++++++++++++++++++++
> 5 files changed, 185 insertions(+)
> create mode 100644 Documentation/hwmon/mp5990.rst
> create mode 100644 drivers/hwmon/pmbus/mp5990.c
>
> diff --git a/Documentation/hwmon/index.rst b/Documentation/hwmon/index.rst
> index 042e1cf9501b..8c70e10fc795 100644
> --- a/Documentation/hwmon/index.rst
> +++ b/Documentation/hwmon/index.rst
> @@ -157,6 +157,7 @@ Hardware Monitoring Kernel Drivers
> mp2888
> mp2975
> mp5023
> + mp5990
> nct6683
> nct6775
> nct7802
> diff --git a/Documentation/hwmon/mp5990.rst b/Documentation/hwmon/mp5990.rst
> new file mode 100644
> index 000000000000..8fc4e388ff7b
> --- /dev/null
> +++ b/Documentation/hwmon/mp5990.rst
> @@ -0,0 +1,84 @@
> +.. SPDX-License-Identifier: GPL-2.0
> +
> +Kernel driver mp5990
> +====================
> +
> +Supported chips:
> +
> + * MPS MP5990
> +
> + Prefix: 'mp5990'
> +
> + * Datasheet
> +
> + Publicly available at the MPS website : https://www.monolithicpower.com/en/mp5990.html
> +
> +Author:
> +
> + Peter Yin <peteryin.openbmc@...il.com>
> +
> +Description
> +-----------
> +
> +This driver implements support for Monolithic Power Systems, Inc. (MPS)
> +MP5990 Hot-Swap Controller.
> +
> +Device complaint with:
compliant
> +
> +- PMBus rev 1.3 interface.
> +
> +Device supports direct 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_max**
> +
> +**in1_max_alarm**
> +
> +**in1_min**
> +
> +**in1_min_alarm**
> +
> +The driver provides the following attributes for output voltage:
> +
> +**in2_input**
> +
> +**in2_label**
> +
> +**in2_alarm**
> +
> +The driver provides the following attributes for output current:
> +
> +**curr1_input**
> +
> +**curr1_label**
> +
> +**curr1_alarm**
> +
> +**curr1_max**
> +
> +The driver provides the following attributes for input power:
> +
> +**power1_input**
> +
> +**power1_label**
> +
> +**power1_alarm**
> +
> +The driver provides the following attributes for temperature:
> +
> +**temp1_input**
> +
> +**temp1_max**
> +
> +**temp1_max_alarm**
> +
> +**temp1_crit**
> +
> +**temp1_crit_alarm**
> diff --git a/drivers/hwmon/pmbus/Kconfig b/drivers/hwmon/pmbus/Kconfig
> index 270b6336b76d..65a116f7744d 100644
> --- a/drivers/hwmon/pmbus/Kconfig
> +++ b/drivers/hwmon/pmbus/Kconfig
> @@ -326,6 +326,15 @@ config SENSORS_MP5023
> This driver can also be built as a module. If so, the module will
> be called mp5023.
>
> +config SENSORS_MP5990
> + tristate "MPS MP5990"
> + help
> + If you say yes here you get hardware monitoring support for MPS
> + MP5990.
> +
> + This driver can also be built as a module. If so, the module will
> + be called mp5990.
> +
> config SENSORS_MPQ7932_REGULATOR
> bool "Regulator support for MPQ7932"
> depends on SENSORS_MPQ7932 && REGULATOR
> diff --git a/drivers/hwmon/pmbus/Makefile b/drivers/hwmon/pmbus/Makefile
> index 84ee960a6c2d..212d9ca0acc9 100644
> --- a/drivers/hwmon/pmbus/Makefile
> +++ b/drivers/hwmon/pmbus/Makefile
> @@ -35,6 +35,7 @@ obj-$(CONFIG_SENSORS_MAX8688) += max8688.o
> obj-$(CONFIG_SENSORS_MP2888) += mp2888.o
> obj-$(CONFIG_SENSORS_MP2975) += mp2975.o
> obj-$(CONFIG_SENSORS_MP5023) += mp5023.o
> +obj-$(CONFIG_SENSORS_MP5990) += mp5990.o
> obj-$(CONFIG_SENSORS_MPQ7932) += mpq7932.o
> obj-$(CONFIG_SENSORS_PLI1209BC) += pli1209bc.o
> obj-$(CONFIG_SENSORS_PM6764TR) += pm6764tr.o
> diff --git a/drivers/hwmon/pmbus/mp5990.c b/drivers/hwmon/pmbus/mp5990.c
> new file mode 100644
> index 000000000000..c3b31af9f750
> --- /dev/null
> +++ b/drivers/hwmon/pmbus/mp5990.c
> @@ -0,0 +1,90 @@
> +// SPDX-License-Identifier: GPL-2.0-or-later
> +/*
> + * Driver for MPS MP5990 Hot-Swap Controller
> + */
> +
> +#include <linux/i2c.h>
> +#include <linux/module.h>
> +#include <linux/of_device.h>
> +#include <linux/pmbus.h>
> +#include "pmbus.h"
> +
> +static int mp5990_read_byte_data(struct i2c_client *client, int page, int reg)
> +{
> + switch (reg) {
> + case PMBUS_VOUT_MODE:
> + /*
> + Enforce VOUT direct format, C4h reg BIT9
> + default val is not match vout format
> + */
/*
* Please use proper multi-line comments. Also, the problem here is that the
* chip does not support the VOUT_MODE command, which should be mentioned.
*
* On top of that, overwriting PMBUS_VOUT_MODE result from the chip is only
* necessary if the chip does not return an error when reading the value.
* If that is the case, it should be mentioned in the comment. The above
* does not explain why this would be needed, even if the command is not
* (officially) supported by the chip. What does it return that requires
* an overwrite ?
*/
> + return PB_VOUT_MODE_DIRECT;
> + default:
> + return -ENODATA;
> + }
> +}
> +
> +static struct pmbus_driver_info mp5990_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] = 32,
> + .b[PSC_VOLTAGE_IN] = 0,
> + .R[PSC_VOLTAGE_IN] = 0,
> + .m[PSC_VOLTAGE_OUT] = 32,
> + .b[PSC_VOLTAGE_OUT] = 0,
> + .R[PSC_VOLTAGE_OUT] = 0,
> + .m[PSC_CURRENT_OUT] = 16,
> + .b[PSC_CURRENT_OUT] = 0,
> + .R[PSC_CURRENT_OUT] = 0,
> + .m[PSC_POWER] = 1,
> + .b[PSC_POWER] = 0,
> + .R[PSC_POWER] = 0,
> + .m[PSC_TEMPERATURE] = 1,
> + .b[PSC_TEMPERATURE] = 0,
> + .R[PSC_TEMPERATURE] = 0,
> + .func[0] =
> + PMBUS_HAVE_VIN | PMBUS_HAVE_VOUT | PMBUS_HAVE_PIN |
> + PMBUS_HAVE_TEMP | PMBUS_HAVE_IOUT |
> + PMBUS_HAVE_STATUS_INPUT | PMBUS_HAVE_STATUS_TEMP,
> + .read_byte_data = mp5990_read_byte_data,
> +};
> +
> +static int mp5990_probe(struct i2c_client *client)
> +{
> + int ret;
> +
> + ret = i2c_smbus_write_byte_data(client, PMBUS_VOUT_MODE,
> + PB_VOUT_MODE_DIRECT);
According to the datasheet, the chip does not support the VOUT_MODE
command. Supposedly, direct vs. linear mode is selected with bit 9
of EFUSE_CFG. Even if the chip happens to "silently" support the command,
the official command should be used to select the chip mode.
Next question: Why use direct mode ? Linear mode is supported and would
be much more flexible.
> + if (ret < 0)
> + return ret;
> + return pmbus_do_probe(client, &mp5990_info);
> +}
> +
> +static const struct of_device_id mp5990_of_match[] = {
> + { .compatible = "mps,mp5990" },
> + {}
> +};
> +
> +static const struct i2c_device_id mp5990_id[] = {
> + {"mp5990", 0},
> + { }
> +};
> +MODULE_DEVICE_TABLE(i2c, mp5990_id);
> +
> +static struct i2c_driver mp5990_driver = {
> + .driver = {
> + .name = "mp5990",
> + .of_match_table = of_match_ptr(mp5990_of_match),
Using of_match_ptr() will result in a build failure if CONFIG_OF=n.
> + },
> + .probe = mp5990_probe,
> + .id_table = mp5990_id,
> +};
> +module_i2c_driver(mp5990_driver);
> +
> +MODULE_AUTHOR("Peter Yin <peter.yin@...ntatw.com>");
> +MODULE_DESCRIPTION("PMBus driver for MP5990 HSC");
> +MODULE_LICENSE("GPL");
> +MODULE_IMPORT_NS(PMBUS);
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