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

From: Robert Marko
Date: Thu May 27 2021 - 10:59:17 EST

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On Thu, May 27, 2021 at 4:50 PM Guenter Roeck <linux@xxxxxxxxxxxx> wrote:
>
> On 5/27/21 7:17 AM, Robert Marko wrote:
> > On Thu, May 27, 2021 at 4:03 PM Guenter Roeck <linux@xxxxxxxxxxxx> wrote:
> >>
> >> On 5/27/21 3:59 AM, Robert Marko wrote:
> >>> On Thu, May 27, 2021 at 12:22 PM Robert Marko <robert.marko@xxxxxxxxxx> wrote:
> >>>>
> >>>> On Mon, May 24, 2021 at 3:47 PM Guenter Roeck <linux@xxxxxxxxxxxx> wrote:
> >>>>>
> >>>>> On 5/24/21 5:21 AM, Robert Marko wrote:
> >>>>>> On Fri, May 21, 2021 at 4:46 PM Guenter Roeck <linux@xxxxxxxxxxxx> wrote:
> >>>>>>>
> >>>>>>> On 5/21/21 4:56 AM, Robert Marko wrote:
> >>>>>>>> On Fri, May 21, 2021 at 12:56 PM Guenter Roeck <linux@xxxxxxxxxxxx> wrote:
> >>>>>>>>>
> >>>>>>>>> On 5/21/21 1:36 AM, Robert Marko wrote:
> >>>>>>>>>> On Wed, May 19, 2021 at 3:19 PM Guenter Roeck <linux@xxxxxxxxxxxx> wrote:
> >>>>>>>>>>>
> >>>>>>>>>>> On 5/19/21 5:38 AM, Robert Marko wrote:
> >>>>>>>>>>>> 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.
> >>>>>>>>>>>>
> >>>>>>>>>>>
> >>>>>>>>>>> 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 ?
> >>>>>>>>>
> >>>>>>>> Sure:
> >>>>>>>>>
> >>>>>>>>> curr1_crit:-500
> >>>>>>>>> curr1_crit_alarm:0
> >>>>>>>>> curr1_input:195
> >>>>>>>>> curr1_label:iin
> >>>>>>>>> curr1_max:-500
> >>>>>>>>> curr1_max_alarm:0
> >>>>>>>>> curr1_rated_max:-500
> >>>>>>>>> curr2_crit:-500
> >>>>>>>>> curr2_crit_alarm:0
> >>>>>>>>> curr2_input:320
> >>>>>>>>> curr2_label:iout1
> >>>>>>>>> curr2_lcrit:-500
> >>>>>>>>> curr2_lcrit_alarm:0
> >>>>>>>>> curr2_max:18625
> >>>>>>>>> curr2_max_alarm:0
> >>>>>>>>> curr2_rated_max:16875
> >>>>>>>>> grep: device: Is a directory
> >>>>>>>>> fan1_alarm:0
> >>>>>>>>> fan1_fault:0
> >>>>>>>>> fan1_input:10000
> >>>>>>>>> fan1_target:0
> >>>>>>>>> fan2_alarm:1
> >>>>>>>>> fan2_fault:1
> >>>>>>>>> fan2_input:-1
> >>>>>>>>> fan2_target:-1
> >>>>>>>>> fan3_alarm:1
> >>>>>>>>> fan3_fault:1
> >>>>>>>>> fan3_input:-1
> >>>>>>>>> fan3_target:-1
> >>>>>>>>> in1_crit:-500
> >>>>>>>>> in1_crit_alarm:0
> >>>>>>>>> in1_input:245250
> >>>>>>>>> in1_label:vin
> >>>>>>>>> in1_lcrit:-500
> >>>>>>>>> in1_lcrit_alarm:0
> >>>>>>>>> in1_max:-500
> >>>>>>>>> in1_max_alarm:0
> >>>>>>>>> in1_min:-500
> >>>>>>>>> in1_min_alarm:0
> >>>>>>>>> in1_rated_max:-500
> >>>>>>>>> in1_rated_min:-500
> >>>>>>>>> in2_input:-500
> >>>>>>>>> in2_label:vcap
> >>>>>>>>> in3_crit:255996
> >>>>>>>>> in3_crit_alarm:0
> >>>>>>>>> in3_input:54511
> >>>>>>>>> in3_label:vout1
> >>>>>>>>> in3_lcrit:255996
> >>>>>>>>> in3_lcrit_alarm:0
> >>>>>>>>> in3_max:255996
> >>>>>>>>> in3_max_alarm:0
> >>>>>>>>> in3_min:255996
> >>>>>>>>> in3_min_alarm:0
> >>>>>>>>> in3_rated_max:56136
> >>>>>>>>> in3_rated_min:52863
> >>>>>>>>> name:dps920ab
> >>>>>>>>> grep: of_node: Is a directory
> >>>>>>>>> grep: power: Is a directory
> >>>>>>>>> power1_alarm:0
> >>>>>>>>> power1_input:33250000
> >>>>>>>>> power1_label:pin
> >>>>>>>>> power1_max:-500000
> >>>>>>>>> power1_rated_max:-500000
> >>>>>>>>> power2_cap:-500000
> >>>>>>>>> power2_cap_alarm:0
> >>>>>>>>> power2_crit:-500000
> >>>>>>>>> power2_crit_alarm:0
> >>>>>>>>> power2_input:17750000
> >>>>>>>>> power2_label:pout1
> >>>>>>>>> power2_max:-500000
> >>>>>>>>> power2_max_alarm:0
> >>>>>>>>> power2_rated_max:920000000
> >>>>>>>>> grep: subsystem: Is a directory
> >>>>>>>>> temp1_crit:-500
> >>>>>>>>> temp1_crit_alarm:0
> >>>>>>>>> temp1_input:23000
> >>>>>>>>> temp1_lcrit:-500
> >>>>>>>>> temp1_lcrit_alarm:0
> >>>>>>>>> temp1_max:-500
> >>>>>>>>> temp1_max_alarm:0
> >>>>>>>>> temp1_min:-500
> >>>>>>>>> temp1_min_alarm:0
> >>>>>>>>> temp1_rated_max:-500
> >>>>>>>>> temp2_crit:-500
> >>>>>>>>> temp2_crit_alarm:0
> >>>>>>>>> temp2_input:26000
> >>>>>>>>> temp2_lcrit:-500
> >>>>>>>>> temp2_lcrit_alarm:0
> >>>>>>>>> temp2_max:-500
> >>>>>>>>> temp2_max_alarm:0
> >>>>>>>>> temp2_min:-500
> >>>>>>>>> temp2_min_alarm:0
> >>>>>>>>> temp2_rated_max:-500
> >>>>>>>>> temp3_crit:-500
> >>>>>>>>> temp3_crit_alarm:0
> >>>>>>>>> temp3_input:30000
> >>>>>>>>> temp3_lcrit:-500
> >>>>>>>>> temp3_lcrit_alarm:0
> >>>>>>>>> temp3_max:-500
> >>>>>>>>> temp3_max_alarm:0
> >>>>>>>>> temp3_min:-500
> >>>>>>>>> temp3_min_alarm:0
> >>>>>>>>> temp3_rated_max:-500
> >>>>>>>>> uevent:OF_NAME=psu
> >>>>>>>>> uevent:OF_FULLNAME=/ap806/config-space@f0000000/i2c@511000/psu@5a
> >>>>>>>>> uevent:OF_COMPATIBLE_0=delta,dps920ab
> >>>>>>>>> uevent:OF_COMPATIBLE_N=1
> >>>>>>>>
> >>>>>>> Ok, good enough. It looks like the PSU reports values for pretty much everything,
> >>>>>>> including registers which don't exist. With that in mind, please check
> >>>>>>> the attributes generated by your driver - I suspect that some of the limit
> >>>>>>> attributes are not really supported (maybe none of them is supported).
> >>>>>>
> >>>>>> Yeah, I also think that none of those limits are actually supported.
> >>>>>> Does the core expose a way to not register those?
> >>>>>>
> >>>>>
> >>>>> Have the read_word function return -ENXIO for unsupported registers
> >>>>> (and add a comment to the code explaining why you do that).
> >>>>> See drivers/hwmon/pmbus/fsp-3y.c for an example.
> >>>>
> >>>> Thanks, will implement that.
> >>>> In the meantime I finally got the PMBus command list that
> >>>> the PSU supports.
> >>>> It implements PMBus 1.2, but it also claims that MFR_ID,
> >>>> MFR_MODEL and MFR_REVISION are supported.
> >>>>
> >>>> Block read returns what looks like a correct length, but the buffer
> >>>> is empty.
> >>>>>
> >>>>> [ 195.246464] dps920ab 0-005a: PMBUS_MFR_ID length: 5
> >>>>> [ 195.251495] dps920ab 0-005a: PMBUS_MFR_ID:
> >>>>> [ 195.300789] dps920ab 0-005b: PMBUS_MFR_ID length: 5
> >>>>> [ 195.305762] dps920ab 0-005b: PMBUS_MFR_ID:
> >>>>> [ 272.795222] dps920ab 0-005a: PMBUS_MFR_ID length: 5
> >>>>> [ 272.800190] dps920ab 0-005a: PMBUS_MFR_ID:
> >>>>> [ 272.804862] dps920ab 0-005a: PMBUS_MFR_MODEL length: 11
> >>>>> [ 272.810172] dps920ab 0-005a: PMBUS_MFR_MODEL:
> >>>>> [ 272.815098] dps920ab 0-005a: PMBUS_MFR_REVISION length: 2
> >>>>> [ 272.820600] dps920ab 0-005a: PMBUS_MFR_REVISION:
> >>>>> [ 272.874060] dps920ab 0-005b: PMBUS_MFR_ID length: 5
> >>>>> [ 272.879102] dps920ab 0-005b: PMBUS_MFR_ID:
> >>>>> [ 272.883833] dps920ab 0-005b: PMBUS_MFR_MODEL length: 11
> >>>>> [ 272.889151] dps920ab 0-005b: PMBUS_MFR_MODEL:
> >>>>> [ 272.894097] dps920ab 0-005b: PMBUS_MFR_REVISION length: 2
> >>>>> [ 272.899548] dps920ab 0-005b: PMBUS_MFR_REVISION:
> >>>>
> >>>>
> >>>> However, manually reading using i2cget in word mode returns
> >>>> something that looks ok.
> >>>> i2cget -y 0 0x5a 0x9a w
> >>>> 0x440b
> >>>>
> >>>> This would be D is ASCII, it looks like any kind of block read fails actually.
> >>>
> >>> Ok, so after using i2c_smbus_read_i2c_block_data() I can actually read
> >>> the model kind of OK.
> >>> There actually are 10 bytes of valid data, no idea why
> >>> i2c_smbus_read_block_data() does not work.
> >>>>
> >>>> [ 721.194706] dps920ab 0-005a: MFR MODEL:
> >>>> DPS-920AB
> >>>> [ 721.245502] dps920ab 0-005b: MFR MODEL:
> >>>> DPS-920AB
> >>>
> >>> It behaves weirdly when printing by creating a newline before and
> >>> stuff like that.
> >>>
> >>
> >> I suspect it prints the first byte, which should be the length.
> >> I also suspect that the i2c controller driver has a bug and doesn't
> >> support SMBus block data correctly. Did you try i2cdump with i and s
> >> options ?
> >
> > That could be the case, I just wanted to see whether the controller or
> > PSU are at fault.
> > I tried using s with i2cdump and it will error out on the controller
> > not supporting block reads.
> > The controller most likely has a bug in the driver.
> >>
> >>>> I tried applying the block support for mv64xx as well:
> >>>> https://patchwork.ozlabs.org/project/linux-i2c/patch/20200118115820.9080-1-fuga@xxxxxxxxxxxxxx/
> >>
> >> That patch would be needed, but it looks buggy to me. This chunk:
> >>
> >> + drv_data->effective_length = data+1;
> >> + drv_data->bytes_left = data+1;
> >> + drv_data->msg->len = data+1;
> >>
> >> should be:
> >>
> >> + drv_data->effective_length = data+1;
> >> + drv_data->bytes_left = data;
> >> + drv_data->msg->len = data+1;
> >>
> >> It should also make sure that 'data' is not larger than I2C_SMBUS_BLOCK_MAX,
> >> and bail out if it isn't.
> >
> > Yeah, I did not check the contents, I just saw 2 reviews and tested it
> > since it can't hurt.
>
> That patch doesn't work at all. Make the above change, and also change
> the type of effective_length from u32 to int, and try again.

I was just looking and it, and doing the changes you recommended make
no difference at all.

I will see who can I contact to check this out further.
Robert
>
> Guenter
>
> >>
> >> Do you see a difference with the patch applied ?
> >
> > No, unfortunately not, i2cdump in s mode returns all zeroes.
> > I can see that it gets the correct length but returns all zeroes.
> >
> > I did some development on the driver, added whitelisting for
> > word-based registers.
> > Found that this thing actually has the third temperature sensor after
> > all and a lot of warnings
> > and stuff are supported.
> >
> > I need to review the byte-based registers and whitelist those if needed.
> >
> > Tried adding PWM/DC control for the fan as it supports it, but it was
> > a bit confusing so I
> > gave up on that for now.
> >
> > Regards,
> > Robert
> >>
> >> Guenter
> >
> >
> >
>

--
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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