Re: [PATCH 1/3] hwmon: (pmbus) Add driver for Delta DPS-920AB PSU

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On Fri, Apr 30, 2021 at 3:48 PM Guenter Roeck <linux@xxxxxxxxxxxx> 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@xxxxxxxxxx>
> > ---
> >  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@xxxxxxxxxx>
> > +
> > +
> > +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.

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@xxxxxxxxxx>");
> > +MODULE_DESCRIPTION("PMBus driver for Delta DPS920AB PSU");
> > +MODULE_LICENSE("GPL");
> > --
> > 2.31.1
> >



-- 
Robert Marko
Staff Embedded Linux Engineer
Sartura Ltd.
Lendavska ulica 16a
10000 Zagreb, Croatia
Email: robert.marko@xxxxxxxxxx
Web: www.sartura.hr



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