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Date: Fri, 21 May 2021 03:56:44 -0700
From: Guenter Roeck <linux@...ck-us.net>
To: Robert Marko <robert.marko@...tura.hr>
Cc: jdelvare@...e.com, corbet@....net, linux-hwmon@...r.kernel.org,
devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
Luka Perkov <luka.perkov@...tura.hr>, jmp@...phyte.org,
Paul Menzel <pmenzel@...gen.mpg.de>,
Donald Buczek <buczek@...gen.mpg.de>
Subject: Re: [PATCH 1/3] hwmon: (pmbus) Add driver for Delta DPS-920AB PSU
On 5/21/21 1:36 AM, Robert Marko wrote:
> On Wed, May 19, 2021 at 3:19 PM Guenter Roeck <linux@...ck-us.net> wrote:
>>
>> On 5/19/21 5:38 AM, Robert Marko wrote:
>>> On Fri, Apr 30, 2021 at 3:48 PM Guenter Roeck <linux@...ck-us.net> wrote:
>>>>
>>>> On Fri, Apr 30, 2021 at 03:27:33PM +0200, Robert Marko wrote:
>>>>> This adds support for the Delta DPS-920AB PSU.
>>>>>
>>>>> Only missing feature is fan control which the PSU supports.
>>>>>
>>>>> Signed-off-by: Robert Marko <robert.marko@...tura.hr>
>>>>> ---
>>>>> Documentation/hwmon/dps920ab.rst | 80 ++++++++++++++++++++++++++++++++
>>>>> Documentation/hwmon/index.rst | 1 +
>>>>> drivers/hwmon/pmbus/Kconfig | 9 ++++
>>>>> drivers/hwmon/pmbus/Makefile | 1 +
>>>>> drivers/hwmon/pmbus/dps920ab.c | 63 +++++++++++++++++++++++++
>>>>> 5 files changed, 154 insertions(+)
>>>>> create mode 100644 Documentation/hwmon/dps920ab.rst
>>>>> create mode 100644 drivers/hwmon/pmbus/dps920ab.c
>>>>>
>>>>> diff --git a/Documentation/hwmon/dps920ab.rst b/Documentation/hwmon/dps920ab.rst
>>>>> new file mode 100644
>>>>> index 000000000000..df0aef530c7e
>>>>> --- /dev/null
>>>>> +++ b/Documentation/hwmon/dps920ab.rst
>>>>> @@ -0,0 +1,80 @@
>>>>> +.. SPDX-License-Identifier: GPL-2.0-or-later
>>>>> +
>>>>> +Kernel driver dps920ab
>>>>> +========================
>>>>> +
>>>>> +Supported chips:
>>>>> +
>>>>> + * Delta DPS920AB
>>>>> +
>>>>> + Prefix: 'dps920ab'
>>>>> +
>>>>> + Addresses scanned: -
>>>>> +
>>>>> +Authors:
>>>>> + Robert Marko <robert.marko@...tura.hr>
>>>>> +
>>>>> +
>>>>> +Description
>>>>> +-----------
>>>>> +
>>>>> +This driver implements support for Delta DPS920AB 920W 54V DC single output
>>>>> +power supply with PMBus support.
>>>>> +
>>>>> +The driver is a client driver to the core PMBus driver.
>>>>> +Please see Documentation/hwmon/pmbus.rst for details on PMBus client drivers.
>>>>> +
>>>>> +
>>>>> +Usage Notes
>>>>> +-----------
>>>>> +
>>>>> +This driver does not auto-detect devices. You will have to instantiate the
>>>>> +devices explicitly. Please see Documentation/i2c/instantiating-devices.rst for
>>>>> +details.
>>>>> +
>>>>> +
>>>>> +Sysfs entries
>>>>> +-------------
>>>>> +
>>>>> +======================= ======================================================
>>>>> +curr1_label "iin"
>>>>> +curr1_input Measured input current
>>>>> +curr1_crit Critical maximum current
>>>>> +curr1_crit_alarm Current critical high alarm
>>>>> +
>>>>> +curr2_label "iout1"
>>>>> +curr2_input Measured output current
>>>>> +curr2_crit Critical maximum current
>>>>> +curr2_crit_alarm Current critical high alarm
>>>>> +
>>>>> +in1_label "vin"
>>>>> +in1_input Measured input voltage
>>>>> +in1_lcrit Critical minimum input voltage
>>>>> +in1_lcrit_alarm Input voltage critical low alarm
>>>>> +in1_crit Critical maximum input voltage
>>>>> +in1_crit_alarm Input voltage critical high alarm
>>>>> +
>>>>> +in2_label "vout1"
>>>>> +in2_input Measured output voltage
>>>>> +in2_lcrit Critical minimum output voltage
>>>>> +in2_lcrit_alarm Output voltage critical low alarm
>>>>> +in2_crit Critical maximum output voltage
>>>>> +in2_crit_alarm Output voltage critical high alarm
>>>>> +
>>>>> +power1_label "pin"
>>>>> +power1_input Measured input power
>>>>> +power1_alarm Input power high alarm
>>>>> +
>>>>> +power2_label "pout1"
>>>>> +power2_input Measured output power
>>>>> +
>>>>> +temp[1-2]_input Measured temperature
>>>>> +temp[1-2]_crit Critical high temperature
>>>>> +temp[1-2]_crit_alarm Chip temperature critical high alarm
>>>>> +temp[1-2]_max Maximum temperature
>>>>> +temp[1-2]_max_alarm Chip temperature high alarm
>>>>> +
>>>>> +fan1_alarm Fan 1 warning.
>>>>> +fan1_fault Fan 1 fault.
>>>>> +fan1_input Fan 1 speed in RPM.
>>>>> +======================= ======================================================
>>>>> diff --git a/Documentation/hwmon/index.rst b/Documentation/hwmon/index.rst
>>>>> index 8d5a2df1ecb6..b24436f22052 100644
>>>>> --- a/Documentation/hwmon/index.rst
>>>>> +++ b/Documentation/hwmon/index.rst
>>>>> @@ -54,6 +54,7 @@ Hardware Monitoring Kernel Drivers
>>>>> dell-smm-hwmon
>>>>> dme1737
>>>>> drivetemp
>>>>> + dps920ab
>>>>> ds1621
>>>>> ds620
>>>>> emc1403
>>>>> diff --git a/drivers/hwmon/pmbus/Kconfig b/drivers/hwmon/pmbus/Kconfig
>>>>> index 32d2fc850621..865ade0aa205 100644
>>>>> --- a/drivers/hwmon/pmbus/Kconfig
>>>>> +++ b/drivers/hwmon/pmbus/Kconfig
>>>>> @@ -66,6 +66,15 @@ config SENSORS_IBM_CFFPS
>>>>> This driver can also be built as a module. If so, the module will
>>>>> be called ibm-cffps.
>>>>>
>>>>> +config SENSORS_DPS920AB
>>>>> + tristate "Delta DPS920AB Power Supply"
>>>>> + help
>>>>> + If you say yes here you get hardware monitoring support for Delta
>>>>> + DPS920AB Power Supplies.
>>>>> +
>>>>> + This driver can also be built as a module. If so, the module will
>>>>> + be called dps920ab.
>>>>> +
>>>>> config SENSORS_INSPUR_IPSPS
>>>>> tristate "INSPUR Power System Power Supply"
>>>>> help
>>>>> diff --git a/drivers/hwmon/pmbus/Makefile b/drivers/hwmon/pmbus/Makefile
>>>>> index 6a4ba0fdc1db..f59ba0123d68 100644
>>>>> --- a/drivers/hwmon/pmbus/Makefile
>>>>> +++ b/drivers/hwmon/pmbus/Makefile
>>>>> @@ -9,6 +9,7 @@ obj-$(CONFIG_SENSORS_ADM1266) += adm1266.o
>>>>> obj-$(CONFIG_SENSORS_ADM1275) += adm1275.o
>>>>> obj-$(CONFIG_SENSORS_BEL_PFE) += bel-pfe.o
>>>>> obj-$(CONFIG_SENSORS_IBM_CFFPS) += ibm-cffps.o
>>>>> +obj-$(CONFIG_SENSORS_DPS920AB) += dps920ab.o
>>>>> obj-$(CONFIG_SENSORS_INSPUR_IPSPS) += inspur-ipsps.o
>>>>> obj-$(CONFIG_SENSORS_IR35221) += ir35221.o
>>>>> obj-$(CONFIG_SENSORS_IR38064) += ir38064.o
>>>>> diff --git a/drivers/hwmon/pmbus/dps920ab.c b/drivers/hwmon/pmbus/dps920ab.c
>>>>> new file mode 100644
>>>>> index 000000000000..d579ed9f879c
>>>>> --- /dev/null
>>>>> +++ b/drivers/hwmon/pmbus/dps920ab.c
>>>>> @@ -0,0 +1,63 @@
>>>>> +// SPDX-License-Identifier: GPL-2.0-or-later
>>>>> +/*
>>>>> + * Driver for Delta DPS920AB PSU
>>>>> + *
>>>>> + * Copyright (C) 2021 Delta Networks, Inc.
>>>>> + * Copyright (C) 2021 Sartura Ltd.
>>>>> + */
>>>>> +
>>>>> +#include <linux/i2c.h>
>>>>> +#include <linux/module.h>
>>>>> +#include <linux/of_device.h>
>>>>> +#include "pmbus.h"
>>>>> +
>>>>> +static struct pmbus_driver_info dps920ab_info = {
>>>>> + .pages = 1,
>>>>> +
>>>>> + .format[PSC_VOLTAGE_IN] = linear,
>>>>> + .format[PSC_VOLTAGE_OUT] = linear,
>>>>> + .format[PSC_CURRENT_IN] = linear,
>>>>> + .format[PSC_CURRENT_OUT] = linear,
>>>>> + .format[PSC_POWER] = linear,
>>>>> + .format[PSC_FAN] = linear,
>>>>> + .format[PSC_TEMPERATURE] = linear,
>>>>> +
>>>>> + .func[0] = PMBUS_HAVE_VIN | PMBUS_HAVE_IIN |
>>>>> + PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT |
>>>>> + PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT |
>>>>> + PMBUS_HAVE_TEMP | PMBUS_HAVE_TEMP2 |
>>>>> + PMBUS_HAVE_PIN | PMBUS_HAVE_POUT |
>>>>> + PMBUS_HAVE_FAN12 | PMBUS_HAVE_STATUS_FAN12 |
>>>>> + PMBUS_HAVE_STATUS_INPUT | PMBUS_HAVE_STATUS_TEMP,
>>>>> +};
>>>>> +
>>>>> +static int dps920ab_probe(struct i2c_client *client)
>>>>> +{
>>>>> + if (!i2c_check_functionality(client->adapter,
>>>>> + I2C_FUNC_SMBUS_BYTE_DATA |
>>>>> + I2C_FUNC_SMBUS_WORD_DATA))
>>>>> + return -ENODEV;
>>>>
>>>> This check is done in pmbus_do_probe(), and repeating it here does not add
>>>> any value.
>>>
>>> Ok, makes sense.
>>>>
>>>> That makes me wonder: Is this driver needed in the first place, or could
>>>> it be added to drivers/hwmon/pmbus/pmbus.c ?
>>>
>>> It could be added as a generic driver, but that creates properties in
>>> the sysfs that this thing
>>> does not support like 3 voltage readings, 3 fans, and so on.
>>>
>>
>> Can you be more specific ? What additional unsupported attributes
>> are added, and why ? Are you saying the PSU reports registers as
>> existing which do not really exist ? If so, which registers are those ?
>
> Sure, when core does probing and autodiscovery, then the following
> sysfs attributes are created:
>>
>> curr1_crit fan3_fault in3_min_alarm temp1_max
>> curr1_crit_alarm fan3_input in3_rated_max temp1_max_alarm
>> curr1_input fan3_target in3_rated_min temp1_min
>> curr1_label in1_crit name temp1_min_alarm
>> curr1_max in1_crit_alarm of_node temp1_rated_max
>> curr1_max_alarm in1_input power temp2_crit
>> curr1_rated_max in1_label power1_alarm temp2_crit_alarm
>> curr2_crit in1_lcrit power1_input temp2_input
>> curr2_crit_alarm in1_lcrit_alarm power1_label temp2_lcrit
>> curr2_input in1_max power1_max temp2_lcrit_alarm
>> curr2_label in1_max_alarm power1_rated_max temp2_max
>> curr2_lcrit in1_min power2_cap temp2_max_alarm
>> curr2_lcrit_alarm in1_min_alarm power2_cap_alarm temp2_min
>> curr2_max in1_rated_max power2_crit temp2_min_alarm
>> curr2_max_alarm in1_rated_min power2_crit_alarm temp2_rated_max
>> curr2_rated_max in2_input power2_input temp3_crit
>> device in2_label power2_label temp3_crit_alarm
>> fan1_alarm in3_crit power2_max temp3_input
>> fan1_fault in3_crit_alarm power2_max_alarm temp3_lcrit
>> fan1_input in3_input power2_rated_max temp3_lcrit_alarm
>> fan1_target in3_label subsystem temp3_max
>> fan2_alarm in3_lcrit temp1_crit temp3_max_alarm
>> fan2_fault in3_lcrit_alarm temp1_crit_alarm temp3_min
>> fan2_input in3_max temp1_input temp3_min_alarm
>> fan2_target in3_max_alarm temp1_lcrit temp3_rated_max
>> fan3_alarm in3_min temp1_lcrit_alarm uevent
>
> The following return -1, or -500 so they are not supported.
> * fan2
> * in2
>
> Weirdly, with the external driver both fan2 and in2 are enabled and work fine,
> but when auto probing they are fan3 and in3.
>
> temp3 actually seems to return a valid temperature despite it not being used in
> the vendor driver that features were picked from.
>
Can you run "grep . *" in the hwmon directory so I can see actual values ?
Thanks,
Guenter
>>
>> In this context, I have a hard time finding a reference for
>> this power supply. Do you have a datasheet or some other documents
>> you can share ?
>
> Unfortunately, I don't have a datasheet as that would have made this way easier.
> It was all based on the vendor "driver" from DENT:
> https://github.com/dentproject/dentOS/blob/main/packages/platforms/delta/arm64/tn48m/tn48m-poe/modules/builds/src/arm64-delta-tn48m-poe-psu.c
>
> I will try asking Delta for the datasheet.
> Regards,
> Robert
>
>>
>> Thanks,
>> Guenter
>>
>>> Is it okay to keep it as a separate driver then?
>>>
>>> Regards,
>>> Robert
>>>>
>>>> Thanks,
>>>> Guenter
>>>>
>>>>> +
>>>>> + return pmbus_do_probe(client, &dps920ab_info);
>>>>> +}
>>>>> +
>>>>> +static const struct of_device_id __maybe_unused dps920ab_of_match[] = {
>>>>> + { .compatible = "delta,dps920ab", },
>>>>> + {}
>>>>> +};
>>>>> +
>>>>> +MODULE_DEVICE_TABLE(of, dps920ab_of_match);
>>>>> +
>>>>> +static struct i2c_driver dps920ab_driver = {
>>>>> + .driver = {
>>>>> + .name = "dps920ab",
>>>>> + .of_match_table = of_match_ptr(dps920ab_of_match),
>>>>> + },
>>>>> + .probe_new = dps920ab_probe,
>>>>> +};
>>>>> +
>>>>> +module_i2c_driver(dps920ab_driver);
>>>>> +
>>>>> +MODULE_AUTHOR("Robert Marko <robert.marko@...tura.hr>");
>>>>> +MODULE_DESCRIPTION("PMBus driver for Delta DPS920AB PSU");
>>>>> +MODULE_LICENSE("GPL");
>>>>> --
>>>>> 2.31.1
>>>>>
>>>
>>>
>>>
>>
>
>
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