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Mon, 24 May 2021 06:47:29 -0700 (PDT) Sender: Guenter Roeck Subject: Re: [PATCH 1/3] hwmon: (pmbus) Add driver for Delta DPS-920AB PSU To: Robert Marko Cc: jdelvare@suse.com, corbet@lwn.net, linux-hwmon@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, Luka Perkov , jmp@epiphyte.org, Paul Menzel , Donald Buczek References: <20210430132735.127342-1-robert.marko@sartura.hr> <20210430134810.GA2714262@roeck-us.net> <2b990feb-dc26-debb-4f81-430bbc89b51c@roeck-us.net> <2a1a63c7-c9b0-e38d-df1d-7643ad493aba@roeck-us.net> From: Guenter Roeck Message-ID: <8152a109-d76d-4f85-9da2-fe0a56c2019f@roeck-us.net> Date: Mon, 24 May 2021 06:47:27 -0700 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.8.1 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 7bit Precedence: bulk List-ID: X-Mailing-List: linux-hwmon@vger.kernel.org On 5/24/21 5:21 AM, Robert Marko wrote: > On Fri, May 21, 2021 at 4:46 PM Guenter Roeck wrote: >> >> On 5/21/21 4:56 AM, Robert Marko wrote: >>> On Fri, May 21, 2021 at 12:56 PM Guenter Roeck wrote: >>>> >>>> On 5/21/21 1:36 AM, Robert Marko wrote: >>>>> On Wed, May 19, 2021 at 3:19 PM Guenter Roeck wrote: >>>>>> >>>>>> On 5/19/21 5:38 AM, Robert Marko wrote: >>>>>>> On Fri, Apr 30, 2021 at 3:48 PM Guenter Roeck 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 >>>>>>>>> --- >>>>>>>>> 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 >>>>>>>>> + >>>>>>>>> + >>>>>>>>> +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 >>>>>>>>> +#include >>>>>>>>> +#include >>>>>>>>> +#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. Guenter