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

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

[Robert Marko]

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

[PATCH 2/3] dt-bindings: hwmon: pmbus: Add Delta DPS920AB PSU driver bindings

[Robert Marko]

Add binding document for the Delta DPS920AB PSU driver.

Signed-off-by: Robert Marko <robert.marko@sartura.hr>
---
 .../bindings/hwmon/pmbus/delta,dps920ab.yaml  | 43 +++++++++++++++++++
 1 file changed, 43 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/hwmon/pmbus/delta,dps920ab.yaml

diff --git a/Documentation/devicetree/bindings/hwmon/pmbus/delta,dps920ab.yaml b/Documentation/devicetree/bindings/hwmon/pmbus/delta,dps920ab.yaml
new file mode 100644
index 000000000000..e05363a8e455
--- /dev/null
+++ b/Documentation/devicetree/bindings/hwmon/pmbus/delta,dps920ab.yaml
@@ -0,0 +1,43 @@
+# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
+%YAML 1.2
+---
+
+$id: http://devicetree.org/schemas/hwmon/pmbus/delta,dps920ab.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Delta DPS920AB power supply
+
+maintainers:
+  - Robert Marko <robert.marko@sartura.hr>
+
+description: |
+  Delta DPS920AB is a 920W 54V DC single output power supply
+  with active PFC capable of 16.88A on the 54V output.
+  It has a built in PWM capable fan with tachometer.
+  PMBus is used to expose information about the PSU.
+
+properties:
+  compatible:
+    enum:
+      - delta,dps920ab
+
+  reg:
+    maxItems: 1
+
+required:
+  - compatible
+  - reg
+
+additionalProperties: false
+
+examples:
+  - |
+    i2c {
+        #address-cells = <1>;
+        #size-cells = <0>;
+
+        psu@5a {
+            compatible = "delta,dps920ab";
+            reg = <0x5a>;
+        };
+    };
-- 
2.31.1

Re: [PATCH 2/3] dt-bindings: hwmon: pmbus: Add Delta DPS920AB PSU driver bindings

[Guenter Roeck]

On Fri, Apr 30, 2021 at 03:27:34PM +0200, Robert Marko wrote:
> Add binding document for the Delta DPS920AB PSU driver.
> 

Is there a reason to not just add delta,dps920ab to the list of trivial
devices ?

Thanks,
Guenter

> Signed-off-by: Robert Marko <robert.marko@sartura.hr>
> ---
>  .../bindings/hwmon/pmbus/delta,dps920ab.yaml  | 43 +++++++++++++++++++
>  1 file changed, 43 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/hwmon/pmbus/delta,dps920ab.yaml
> 
> diff --git a/Documentation/devicetree/bindings/hwmon/pmbus/delta,dps920ab.yaml b/Documentation/devicetree/bindings/hwmon/pmbus/delta,dps920ab.yaml
> new file mode 100644
> index 000000000000..e05363a8e455
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/hwmon/pmbus/delta,dps920ab.yaml
> @@ -0,0 +1,43 @@
> +# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +
> +$id: http://devicetree.org/schemas/hwmon/pmbus/delta,dps920ab.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Delta DPS920AB power supply
> +
> +maintainers:
> +  - Robert Marko <robert.marko@sartura.hr>
> +
> +description: |
> +  Delta DPS920AB is a 920W 54V DC single output power supply
> +  with active PFC capable of 16.88A on the 54V output.
> +  It has a built in PWM capable fan with tachometer.
> +  PMBus is used to expose information about the PSU.
> +
> +properties:
> +  compatible:
> +    enum:
> +      - delta,dps920ab
> +
> +  reg:
> +    maxItems: 1
> +
> +required:
> +  - compatible
> +  - reg
> +
> +additionalProperties: false
> +
> +examples:
> +  - |
> +    i2c {
> +        #address-cells = <1>;
> +        #size-cells = <0>;
> +
> +        psu@5a {
> +            compatible = "delta,dps920ab";
> +            reg = <0x5a>;
> +        };
> +    };
> -- 
> 2.31.1
> 

[PATCH 3/3] MAINTAINERS: Add Delta DPS920AB PSU driver

[Robert Marko]

Add maintainers entry for the Delta DPS920AB PSU driver.

Signed-off-by: Robert Marko <robert.marko@sartura.hr>
---
 MAINTAINERS | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/MAINTAINERS b/MAINTAINERS
index 7193624868c7..90eecde2a229 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -5106,6 +5106,14 @@ F:	drivers/mfd/tn48m-cpld.c
 F:	include/dt-bindings/gpio/tn48m-gpio.h
 F:	include/linux/mfd/tn48m.h
 
+DELTA DPS920AB PSU DRIVER
+M:	Robert Marko <robert.marko@sartura.hr>
+L:	linux-hwmon@vger.kernel.org
+S:	Maintained
+F:	Documentation/devicetree/bindings/hwmon/pmbus/delta,dps920ab.yaml
+F:	Documentation/hwmon/dps920ab.rst
+F:	drivers/hwmon/pmbus/dps920ab.c
+
 DENALI NAND DRIVER
 L:	linux-mtd@lists.infradead.org
 S:	Orphan
-- 
2.31.1

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

[Guenter Roeck]

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@sartura.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@sartura.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.

That makes me wonder: Is this driver needed in the first place, or could
it be added to drivers/hwmon/pmbus/pmbus.c ?

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

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

[Robert Marko]

On Fri, Apr 30, 2021 at 3:48 PM Guenter Roeck <linux@roeck-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@sartura.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@sartura.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.

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@sartura.hr>");
> > +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@sartura.hr
Web: www.sartura.hr

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

[Guenter Roeck]

On 5/19/21 5:38 AM, Robert Marko wrote:
> On Fri, Apr 30, 2021 at 3:48 PM Guenter Roeck <linux@roeck-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@sartura.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@sartura.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 ?

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 ?

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

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

[Robert Marko]

On Wed, May 19, 2021 at 3:19 PM Guenter Roeck <linux@roeck-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@roeck-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@sartura.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@sartura.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.

>
> 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@sartura.hr>");
> >>> +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@sartura.hr
Web: www.sartura.hr

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

[Guenter Roeck]

On 5/21/21 1:36 AM, Robert Marko wrote:
> On Wed, May 19, 2021 at 3:19 PM Guenter Roeck <linux@roeck-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@roeck-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@sartura.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@sartura.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@sartura.hr>");
>>>>> +MODULE_DESCRIPTION("PMBus driver for Delta DPS920AB PSU");
>>>>> +MODULE_LICENSE("GPL");
>>>>> --
>>>>> 2.31.1
>>>>>
>>>
>>>
>>>
>>
> 
> 

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

[Robert Marko]

On Fri, May 21, 2021 at 12:56 PM Guenter Roeck <linux@roeck-us.net> wrote:
>
> On 5/21/21 1:36 AM, Robert Marko wrote:
> > On Wed, May 19, 2021 at 3:19 PM Guenter Roeck <linux@roeck-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@roeck-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@sartura.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@sartura.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 ?
>
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


> 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@sartura.hr>");
> >>>>> +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@sartura.hr
Web: www.sartura.hr

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

[Guenter Roeck]

On 5/21/21 4:56 AM, Robert Marko wrote:
> On Fri, May 21, 2021 at 12:56 PM Guenter Roeck <linux@roeck-us.net> wrote:
>>
>> On 5/21/21 1:36 AM, Robert Marko wrote:
>>> On Wed, May 19, 2021 at 3:19 PM Guenter Roeck <linux@roeck-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@roeck-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@sartura.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@sartura.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 ?
>>
> 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).

Thanks,
Guenter

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

[Robert Marko]

On Fri, May 21, 2021 at 4:46 PM Guenter Roeck <linux@roeck-us.net> wrote:
>
> On 5/21/21 4:56 AM, Robert Marko wrote:
> > On Fri, May 21, 2021 at 12:56 PM Guenter Roeck <linux@roeck-us.net> wrote:
> >>
> >> On 5/21/21 1:36 AM, Robert Marko wrote:
> >>> On Wed, May 19, 2021 at 3:19 PM Guenter Roeck <linux@roeck-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@roeck-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@sartura.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@sartura.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 ?
> >>
> > 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?

Regards,
Robert
>
> Thanks,
> Guenter



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

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

[Guenter Roeck]

On 5/24/21 5:21 AM, Robert Marko wrote:
> On Fri, May 21, 2021 at 4:46 PM Guenter Roeck <linux@roeck-us.net> wrote:
>>
>> On 5/21/21 4:56 AM, Robert Marko wrote:
>>> On Fri, May 21, 2021 at 12:56 PM Guenter Roeck <linux@roeck-us.net> wrote:
>>>>
>>>> On 5/21/21 1:36 AM, Robert Marko wrote:
>>>>> On Wed, May 19, 2021 at 3:19 PM Guenter Roeck <linux@roeck-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@roeck-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@sartura.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@sartura.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 ?
>>>>
>>> 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

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

[Robert Marko]

On Mon, May 24, 2021 at 3:47 PM Guenter Roeck <linux@roeck-us.net> wrote:
>
> On 5/24/21 5:21 AM, Robert Marko wrote:
> > On Fri, May 21, 2021 at 4:46 PM Guenter Roeck <linux@roeck-us.net> wrote:
> >>
> >> On 5/21/21 4:56 AM, Robert Marko wrote:
> >>> On Fri, May 21, 2021 at 12:56 PM Guenter Roeck <linux@roeck-us.net> wrote:
> >>>>
> >>>> On 5/21/21 1:36 AM, Robert Marko wrote:
> >>>>> On Wed, May 19, 2021 at 3:19 PM Guenter Roeck <linux@roeck-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@roeck-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@sartura.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@sartura.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 ?
> >>>>
> >>> 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.

I am now a bit confused.
I tried applying the block support for mv64xx as well:
https://patchwork.ozlabs.org/project/linux-i2c/patch/20200118115820.9080-1-fuga@studiofuga.com/

But no luck.

Regards,
Robert
>
> Guenter



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

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

[Robert Marko]

On Thu, May 27, 2021 at 12:22 PM Robert Marko <robert.marko@sartura.hr> wrote:
>
> On Mon, May 24, 2021 at 3:47 PM Guenter Roeck <linux@roeck-us.net> wrote:
> >
> > On 5/24/21 5:21 AM, Robert Marko wrote:
> > > On Fri, May 21, 2021 at 4:46 PM Guenter Roeck <linux@roeck-us.net> wrote:
> > >>
> > >> On 5/21/21 4:56 AM, Robert Marko wrote:
> > >>> On Fri, May 21, 2021 at 12:56 PM Guenter Roeck <linux@roeck-us.net> wrote:
> > >>>>
> > >>>> On 5/21/21 1:36 AM, Robert Marko wrote:
> > >>>>> On Wed, May 19, 2021 at 3:19 PM Guenter Roeck <linux@roeck-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@roeck-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@sartura.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@sartura.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 ?
> > >>>>
> > >>> 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.

Regards,
Robert

>
> I am now a bit confused.
> I tried applying the block support for mv64xx as well:
> https://patchwork.ozlabs.org/project/linux-i2c/patch/20200118115820.9080-1-fuga@studiofuga.com/
>
> But no luck.
>
> Regards,
> Robert
> >
> > Guenter
>
>
>
> --
> Robert Marko
> Staff Embedded Linux Engineer
> Sartura Ltd.
> Lendavska ulica 16a
> 10000 Zagreb, Croatia
> Email: robert.marko@sartura.hr
> Web: www.sartura.hr



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

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

[Guenter Roeck]

On 5/27/21 3:59 AM, Robert Marko wrote:
> On Thu, May 27, 2021 at 12:22 PM Robert Marko <robert.marko@sartura.hr> wrote:
>>
>> On Mon, May 24, 2021 at 3:47 PM Guenter Roeck <linux@roeck-us.net> wrote:
>>>
>>> On 5/24/21 5:21 AM, Robert Marko wrote:
>>>> On Fri, May 21, 2021 at 4:46 PM Guenter Roeck <linux@roeck-us.net> wrote:
>>>>>
>>>>> On 5/21/21 4:56 AM, Robert Marko wrote:
>>>>>> On Fri, May 21, 2021 at 12:56 PM Guenter Roeck <linux@roeck-us.net> wrote:
>>>>>>>
>>>>>>> On 5/21/21 1:36 AM, Robert Marko wrote:
>>>>>>>> On Wed, May 19, 2021 at 3:19 PM Guenter Roeck <linux@roeck-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@roeck-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@sartura.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@sartura.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 ?
>>>>>>>
>>>>>> 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 ?

>> I tried applying the block support for mv64xx as well:
>> https://patchwork.ozlabs.org/project/linux-i2c/patch/20200118115820.9080-1-fuga@studiofuga.com/

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.

Do you see a difference with the patch applied ?

Guenter

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

[Robert Marko]

On Thu, May 27, 2021 at 4:03 PM Guenter Roeck <linux@roeck-us.net> wrote:
>
> On 5/27/21 3:59 AM, Robert Marko wrote:
> > On Thu, May 27, 2021 at 12:22 PM Robert Marko <robert.marko@sartura.hr> wrote:
> >>
> >> On Mon, May 24, 2021 at 3:47 PM Guenter Roeck <linux@roeck-us.net> wrote:
> >>>
> >>> On 5/24/21 5:21 AM, Robert Marko wrote:
> >>>> On Fri, May 21, 2021 at 4:46 PM Guenter Roeck <linux@roeck-us.net> wrote:
> >>>>>
> >>>>> On 5/21/21 4:56 AM, Robert Marko wrote:
> >>>>>> On Fri, May 21, 2021 at 12:56 PM Guenter Roeck <linux@roeck-us.net> wrote:
> >>>>>>>
> >>>>>>> On 5/21/21 1:36 AM, Robert Marko wrote:
> >>>>>>>> On Wed, May 19, 2021 at 3:19 PM Guenter Roeck <linux@roeck-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@roeck-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@sartura.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@sartura.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 ?
> >>>>>>>
> >>>>>> 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@studiofuga.com/
>
> 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.
>
> 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@sartura.hr
Web: www.sartura.hr

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

[Guenter Roeck]

On 5/27/21 7:17 AM, Robert Marko wrote:
> On Thu, May 27, 2021 at 4:03 PM Guenter Roeck <linux@roeck-us.net> wrote:
>>
>> On 5/27/21 3:59 AM, Robert Marko wrote:
>>> On Thu, May 27, 2021 at 12:22 PM Robert Marko <robert.marko@sartura.hr> wrote:
>>>>
>>>> On Mon, May 24, 2021 at 3:47 PM Guenter Roeck <linux@roeck-us.net> wrote:
>>>>>
>>>>> On 5/24/21 5:21 AM, Robert Marko wrote:
>>>>>> On Fri, May 21, 2021 at 4:46 PM Guenter Roeck <linux@roeck-us.net> wrote:
>>>>>>>
>>>>>>> On 5/21/21 4:56 AM, Robert Marko wrote:
>>>>>>>> On Fri, May 21, 2021 at 12:56 PM Guenter Roeck <linux@roeck-us.net> wrote:
>>>>>>>>>
>>>>>>>>> On 5/21/21 1:36 AM, Robert Marko wrote:
>>>>>>>>>> On Wed, May 19, 2021 at 3:19 PM Guenter Roeck <linux@roeck-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@roeck-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@sartura.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@sartura.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 ?
>>>>>>>>>
>>>>>>>> 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@studiofuga.com/
>>
>> 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.

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
> 
> 
> 

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

[Robert Marko]

On Thu, May 27, 2021 at 4:50 PM Guenter Roeck <linux@roeck-us.net> wrote:
>
> On 5/27/21 7:17 AM, Robert Marko wrote:
> > On Thu, May 27, 2021 at 4:03 PM Guenter Roeck <linux@roeck-us.net> wrote:
> >>
> >> On 5/27/21 3:59 AM, Robert Marko wrote:
> >>> On Thu, May 27, 2021 at 12:22 PM Robert Marko <robert.marko@sartura.hr> wrote:
> >>>>
> >>>> On Mon, May 24, 2021 at 3:47 PM Guenter Roeck <linux@roeck-us.net> wrote:
> >>>>>
> >>>>> On 5/24/21 5:21 AM, Robert Marko wrote:
> >>>>>> On Fri, May 21, 2021 at 4:46 PM Guenter Roeck <linux@roeck-us.net> wrote:
> >>>>>>>
> >>>>>>> On 5/21/21 4:56 AM, Robert Marko wrote:
> >>>>>>>> On Fri, May 21, 2021 at 12:56 PM Guenter Roeck <linux@roeck-us.net> wrote:
> >>>>>>>>>
> >>>>>>>>> On 5/21/21 1:36 AM, Robert Marko wrote:
> >>>>>>>>>> On Wed, May 19, 2021 at 3:19 PM Guenter Roeck <linux@roeck-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@roeck-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@sartura.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@sartura.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 ?
> >>>>>>>>>
> >>>>>>>> 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@studiofuga.com/
> >>
> >> 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@sartura.hr
Web: www.sartura.hr

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

[Guenter Roeck]

On 5/27/21 7:58 AM, Robert Marko wrote:
[ ... ]

>>>>>> I tried applying the block support for mv64xx as well:
>>>>>> https://patchwork.ozlabs.org/project/linux-i2c/patch/20200118115820.9080-1-fuga@studiofuga.com/
>>>>
>>>> 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.
> 

Is the i2c controller compatible with marvell,mv78230-i2c ?
The block transfers would not work in that case. Let me know
and I'll send you a patch that might fix it.

Guenter

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

[Robert Marko]

On Thu, May 27, 2021 at 6:37 PM Guenter Roeck <linux@roeck-us.net> wrote:
>
> On 5/27/21 7:58 AM, Robert Marko wrote:
> [ ... ]
>
> >>>>>> I tried applying the block support for mv64xx as well:
> >>>>>> https://patchwork.ozlabs.org/project/linux-i2c/patch/20200118115820.9080-1-fuga@studiofuga.com/
> >>>>
> >>>> 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.
> >
>
> Is the i2c controller compatible with marvell,mv78230-i2c ?
> The block transfers would not work in that case. Let me know
> and I'll send you a patch that might fix it.

Yes, the CPU is Armada 7040 and I can see that compatible is
marvell,mv78230-i2c indeed.

It would be great if you have the patch,
Regards
Robert
>
> Guenter



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

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

[Guenter Roeck]

On Thu, May 27, 2021 at 09:14:03PM +0200, Robert Marko wrote:
> On Thu, May 27, 2021 at 6:37 PM Guenter Roeck <linux@roeck-us.net> wrote:
> >
> > On 5/27/21 7:58 AM, Robert Marko wrote:
> > [ ... ]
> >
> > >>>>>> I tried applying the block support for mv64xx as well:
> > >>>>>> https://patchwork.ozlabs.org/project/linux-i2c/patch/20200118115820.9080-1-fuga@studiofuga.com/
> > >>>>
> > >>>> 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.
> > >
> >
> > Is the i2c controller compatible with marvell,mv78230-i2c ?
> > The block transfers would not work in that case. Let me know
> > and I'll send you a patch that might fix it.
> 
> Yes, the CPU is Armada 7040 and I can see that compatible is
> marvell,mv78230-i2c indeed.
> 
> It would be great if you have the patch,

See below.

Guenter

---
From 41f6113560e3082293cef6e8f2013e70ee8f54db Mon Sep 17 00:00:00 2001
From: Federico Fuga <fuga@studiofuga.com>
Date: Sat, 18 Jan 2020 12:58:20 +0100
Subject: [PATCH] i2c: mv64xxx: Implement I2C_M_RECV_LEN and
 I2C_FUNC_SMBUS_READ_BLOCK_DATA

The i2c_mv64xxx driver doesn't implement the I2C_M_REC_LEN function
essential to allow blocks with variable length to be read from an i2c
 slave.
This is needed to implement the SMBus Read Block Data function.

This patch implements the function by changing the bytes_left and
msg len on the fly if the flag is specified.

It has been successfully tested on Allwinner A33 with a special
i2c chip that returns variable length blocks on reading.

Signed-off-by: Federico Fuga <fuga@studiofuga.com>
Acked-by: Gregory CLEMENT <gregory.clement@bootlin.com>
Link: https://lore.kernel.org/r/20200118115820.9080-1-fuga@studiofuga.com
[groeck: Various fixes]
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
---
 drivers/i2c/busses/i2c-mv64xxx.c | 75 ++++++++++++++++++++++++++------
 1 file changed, 61 insertions(+), 14 deletions(-)

diff --git a/drivers/i2c/busses/i2c-mv64xxx.c b/drivers/i2c/busses/i2c-mv64xxx.c
index 5c8e94b6cdb5..9dda90359966 100644
--- a/drivers/i2c/busses/i2c-mv64xxx.c
+++ b/drivers/i2c/busses/i2c-mv64xxx.c
@@ -341,7 +341,17 @@ static void mv64xxx_i2c_send_start(struct mv64xxx_i2c_data *drv_data)
 {
 	drv_data->msg = drv_data->msgs;
 	drv_data->byte_posn = 0;
-	drv_data->bytes_left = drv_data->msg->len;
+
+	/*
+	 * If we should retrieve the length from the buffer, make sure
+	 * to read enough bytes to avoid sending the STOP bit after
+	 * the read if the first byte
+	 */
+	if (drv_data->msg->flags & I2C_M_RECV_LEN)
+		drv_data->bytes_left = 3;
+	else
+		drv_data->bytes_left = drv_data->msg->len;
+
 	drv_data->aborting = 0;
 	drv_data->rc = 0;
 
@@ -350,6 +360,47 @@ static void mv64xxx_i2c_send_start(struct mv64xxx_i2c_data *drv_data)
 	       drv_data->reg_base + drv_data->reg_offsets.control);
 }
 
+static void
+mv64xxx_i2c_do_send_stop(struct mv64xxx_i2c_data *drv_data)
+{
+	drv_data->cntl_bits &= ~MV64XXX_I2C_REG_CONTROL_INTEN;
+	writel(drv_data->cntl_bits | MV64XXX_I2C_REG_CONTROL_STOP,
+	       drv_data->reg_base + drv_data->reg_offsets.control);
+	drv_data->block = 0;
+	if (drv_data->errata_delay)
+		udelay(5);
+
+	wake_up(&drv_data->waitq);
+}
+
+static void
+mv64xxx_i2c_do_read_data(struct mv64xxx_i2c_data *drv_data)
+{
+	u8 data;
+
+	data = readl(drv_data->reg_base + drv_data->reg_offsets.data);
+	drv_data->msg->buf[drv_data->byte_posn++] = data;
+
+	if (drv_data->msg->flags & I2C_M_RECV_LEN) {
+		if (!data || data > I2C_SMBUS_BLOCK_MAX) {
+			/*
+			 * FIXME
+			 * Abort and report error. Needs to be
+			 * verified/tested on real hardware.
+			 */
+			drv_data->rc = -EPROTO;
+			mv64xxx_i2c_do_send_stop(drv_data);
+			return;
+		}
+		drv_data->msg->flags &= ~I2C_M_RECV_LEN;
+		drv_data->bytes_left = data;
+		drv_data->msg->len = data + 1;
+	}
+
+	writel(drv_data->cntl_bits,
+	       drv_data->reg_base + drv_data->reg_offsets.control);
+}
+
 static void
 mv64xxx_i2c_do_action(struct mv64xxx_i2c_data *drv_data)
 {
@@ -400,23 +451,13 @@ mv64xxx_i2c_do_action(struct mv64xxx_i2c_data *drv_data)
 		break;
 
 	case MV64XXX_I2C_ACTION_RCV_DATA:
-		drv_data->msg->buf[drv_data->byte_posn++] =
-			readl(drv_data->reg_base + drv_data->reg_offsets.data);
-		writel(drv_data->cntl_bits,
-			drv_data->reg_base + drv_data->reg_offsets.control);
+		mv64xxx_i2c_do_read_data(drv_data);
 		break;
 
 	case MV64XXX_I2C_ACTION_RCV_DATA_STOP:
 		drv_data->msg->buf[drv_data->byte_posn++] =
 			readl(drv_data->reg_base + drv_data->reg_offsets.data);
-		drv_data->cntl_bits &= ~MV64XXX_I2C_REG_CONTROL_INTEN;
-		writel(drv_data->cntl_bits | MV64XXX_I2C_REG_CONTROL_STOP,
-			drv_data->reg_base + drv_data->reg_offsets.control);
-		drv_data->block = 0;
-		if (drv_data->errata_delay)
-			udelay(5);
-
-		wake_up(&drv_data->waitq);
+		mv64xxx_i2c_do_send_stop(drv_data);
 		break;
 
 	case MV64XXX_I2C_ACTION_INVALID:
@@ -680,6 +721,10 @@ mv64xxx_i2c_can_offload(struct mv64xxx_i2c_data *drv_data)
 	if (!drv_data->offload_enabled)
 		return false;
 
+	/* Offload not supported for block data transfers */
+	if (msgs[0].flags & I2C_M_RECV_LEN)
+		return false;
+
 	/*
 	 * We can offload a transaction consisting of a single
 	 * message, as long as the message has a length between 1 and
@@ -697,6 +742,7 @@ mv64xxx_i2c_can_offload(struct mv64xxx_i2c_data *drv_data)
 	    mv64xxx_i2c_valid_offload_sz(msgs) &&
 	    mv64xxx_i2c_valid_offload_sz(msgs + 1) &&
 	    !(msgs[0].flags & I2C_M_RD) &&
+	    !(msgs[1].flags & I2C_M_RECV_LEN) &&
 	    msgs[1].flags & I2C_M_RD)
 		return true;
 
@@ -713,7 +759,8 @@ mv64xxx_i2c_can_offload(struct mv64xxx_i2c_data *drv_data)
 static u32
 mv64xxx_i2c_functionality(struct i2c_adapter *adap)
 {
-	return I2C_FUNC_I2C | I2C_FUNC_10BIT_ADDR | I2C_FUNC_SMBUS_EMUL;
+	return I2C_FUNC_I2C | I2C_FUNC_10BIT_ADDR |
+		I2C_FUNC_SMBUS_READ_BLOCK_DATA | I2C_FUNC_SMBUS_EMUL;
 }
 
 static int
-- 
2.25.1

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

[Robert Marko]

On Thu, May 27, 2021 at 9:27 PM Guenter Roeck <linux@roeck-us.net> wrote:
>
> On Thu, May 27, 2021 at 09:14:03PM +0200, Robert Marko wrote:
> > On Thu, May 27, 2021 at 6:37 PM Guenter Roeck <linux@roeck-us.net> wrote:
> > >
> > > On 5/27/21 7:58 AM, Robert Marko wrote:
> > > [ ... ]
> > >
> > > >>>>>> I tried applying the block support for mv64xx as well:
> > > >>>>>> https://patchwork.ozlabs.org/project/linux-i2c/patch/20200118115820.9080-1-fuga@studiofuga.com/
> > > >>>>
> > > >>>> 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.
> > > >
> > >
> > > Is the i2c controller compatible with marvell,mv78230-i2c ?
> > > The block transfers would not work in that case. Let me know
> > > and I'll send you a patch that might fix it.
> >
> > Yes, the CPU is Armada 7040 and I can see that compatible is
> > marvell,mv78230-i2c indeed.
> >
> > It would be great if you have the patch,
>
> See below.

I can confirm that this does indeed enable block reads and
i2c_smbus_read_block_data()
works now.

PMBUS_MFR_ID and PMBUS_MFR_MODEL are indeed populated.

Regards,
Robert

>
> Guenter
>
> ---
> From 41f6113560e3082293cef6e8f2013e70ee8f54db Mon Sep 17 00:00:00 2001
> From: Federico Fuga <fuga@studiofuga.com>
> Date: Sat, 18 Jan 2020 12:58:20 +0100
> Subject: [PATCH] i2c: mv64xxx: Implement I2C_M_RECV_LEN and
>  I2C_FUNC_SMBUS_READ_BLOCK_DATA
>
> The i2c_mv64xxx driver doesn't implement the I2C_M_REC_LEN function
> essential to allow blocks with variable length to be read from an i2c
>  slave.
> This is needed to implement the SMBus Read Block Data function.
>
> This patch implements the function by changing the bytes_left and
> msg len on the fly if the flag is specified.
>
> It has been successfully tested on Allwinner A33 with a special
> i2c chip that returns variable length blocks on reading.
>
> Signed-off-by: Federico Fuga <fuga@studiofuga.com>
> Acked-by: Gregory CLEMENT <gregory.clement@bootlin.com>
> Link: https://lore.kernel.org/r/20200118115820.9080-1-fuga@studiofuga.com
> [groeck: Various fixes]
> Signed-off-by: Guenter Roeck <linux@roeck-us.net>
> ---
>  drivers/i2c/busses/i2c-mv64xxx.c | 75 ++++++++++++++++++++++++++------
>  1 file changed, 61 insertions(+), 14 deletions(-)
>
> diff --git a/drivers/i2c/busses/i2c-mv64xxx.c b/drivers/i2c/busses/i2c-mv64xxx.c
> index 5c8e94b6cdb5..9dda90359966 100644
> --- a/drivers/i2c/busses/i2c-mv64xxx.c
> +++ b/drivers/i2c/busses/i2c-mv64xxx.c
> @@ -341,7 +341,17 @@ static void mv64xxx_i2c_send_start(struct mv64xxx_i2c_data *drv_data)
>  {
>         drv_data->msg = drv_data->msgs;
>         drv_data->byte_posn = 0;
> -       drv_data->bytes_left = drv_data->msg->len;
> +
> +       /*
> +        * If we should retrieve the length from the buffer, make sure
> +        * to read enough bytes to avoid sending the STOP bit after
> +        * the read if the first byte
> +        */
> +       if (drv_data->msg->flags & I2C_M_RECV_LEN)
> +               drv_data->bytes_left = 3;
> +       else
> +               drv_data->bytes_left = drv_data->msg->len;
> +
>         drv_data->aborting = 0;
>         drv_data->rc = 0;
>
> @@ -350,6 +360,47 @@ static void mv64xxx_i2c_send_start(struct mv64xxx_i2c_data *drv_data)
>                drv_data->reg_base + drv_data->reg_offsets.control);
>  }
>
> +static void
> +mv64xxx_i2c_do_send_stop(struct mv64xxx_i2c_data *drv_data)
> +{
> +       drv_data->cntl_bits &= ~MV64XXX_I2C_REG_CONTROL_INTEN;
> +       writel(drv_data->cntl_bits | MV64XXX_I2C_REG_CONTROL_STOP,
> +              drv_data->reg_base + drv_data->reg_offsets.control);
> +       drv_data->block = 0;
> +       if (drv_data->errata_delay)
> +               udelay(5);
> +
> +       wake_up(&drv_data->waitq);
> +}
> +
> +static void
> +mv64xxx_i2c_do_read_data(struct mv64xxx_i2c_data *drv_data)
> +{
> +       u8 data;
> +
> +       data = readl(drv_data->reg_base + drv_data->reg_offsets.data);
> +       drv_data->msg->buf[drv_data->byte_posn++] = data;
> +
> +       if (drv_data->msg->flags & I2C_M_RECV_LEN) {
> +               if (!data || data > I2C_SMBUS_BLOCK_MAX) {
> +                       /*
> +                        * FIXME
> +                        * Abort and report error. Needs to be
> +                        * verified/tested on real hardware.
> +                        */
> +                       drv_data->rc = -EPROTO;
> +                       mv64xxx_i2c_do_send_stop(drv_data);
> +                       return;
> +               }
> +               drv_data->msg->flags &= ~I2C_M_RECV_LEN;
> +               drv_data->bytes_left = data;
> +               drv_data->msg->len = data + 1;
> +       }
> +
> +       writel(drv_data->cntl_bits,
> +              drv_data->reg_base + drv_data->reg_offsets.control);
> +}
> +
>  static void
>  mv64xxx_i2c_do_action(struct mv64xxx_i2c_data *drv_data)
>  {
> @@ -400,23 +451,13 @@ mv64xxx_i2c_do_action(struct mv64xxx_i2c_data *drv_data)
>                 break;
>
>         case MV64XXX_I2C_ACTION_RCV_DATA:
> -               drv_data->msg->buf[drv_data->byte_posn++] =
> -                       readl(drv_data->reg_base + drv_data->reg_offsets.data);
> -               writel(drv_data->cntl_bits,
> -                       drv_data->reg_base + drv_data->reg_offsets.control);
> +               mv64xxx_i2c_do_read_data(drv_data);
>                 break;
>
>         case MV64XXX_I2C_ACTION_RCV_DATA_STOP:
>                 drv_data->msg->buf[drv_data->byte_posn++] =
>                         readl(drv_data->reg_base + drv_data->reg_offsets.data);
> -               drv_data->cntl_bits &= ~MV64XXX_I2C_REG_CONTROL_INTEN;
> -               writel(drv_data->cntl_bits | MV64XXX_I2C_REG_CONTROL_STOP,
> -                       drv_data->reg_base + drv_data->reg_offsets.control);
> -               drv_data->block = 0;
> -               if (drv_data->errata_delay)
> -                       udelay(5);
> -
> -               wake_up(&drv_data->waitq);
> +               mv64xxx_i2c_do_send_stop(drv_data);
>                 break;
>
>         case MV64XXX_I2C_ACTION_INVALID:
> @@ -680,6 +721,10 @@ mv64xxx_i2c_can_offload(struct mv64xxx_i2c_data *drv_data)
>         if (!drv_data->offload_enabled)
>                 return false;
>
> +       /* Offload not supported for block data transfers */
> +       if (msgs[0].flags & I2C_M_RECV_LEN)
> +               return false;
> +
>         /*
>          * We can offload a transaction consisting of a single
>          * message, as long as the message has a length between 1 and
> @@ -697,6 +742,7 @@ mv64xxx_i2c_can_offload(struct mv64xxx_i2c_data *drv_data)
>             mv64xxx_i2c_valid_offload_sz(msgs) &&
>             mv64xxx_i2c_valid_offload_sz(msgs + 1) &&
>             !(msgs[0].flags & I2C_M_RD) &&
> +           !(msgs[1].flags & I2C_M_RECV_LEN) &&
>             msgs[1].flags & I2C_M_RD)
>                 return true;
>
> @@ -713,7 +759,8 @@ mv64xxx_i2c_can_offload(struct mv64xxx_i2c_data *drv_data)
>  static u32
>  mv64xxx_i2c_functionality(struct i2c_adapter *adap)
>  {
> -       return I2C_FUNC_I2C | I2C_FUNC_10BIT_ADDR | I2C_FUNC_SMBUS_EMUL;
> +       return I2C_FUNC_I2C | I2C_FUNC_10BIT_ADDR |
> +               I2C_FUNC_SMBUS_READ_BLOCK_DATA | I2C_FUNC_SMBUS_EMUL;
>  }
>
>  static int
> --
> 2.25.1
>


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

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

[Guenter Roeck]

On 5/27/21 12:43 PM, Robert Marko wrote:
> On Thu, May 27, 2021 at 9:27 PM Guenter Roeck <linux@roeck-us.net> wrote:
>>
>> On Thu, May 27, 2021 at 09:14:03PM +0200, Robert Marko wrote:
>>> On Thu, May 27, 2021 at 6:37 PM Guenter Roeck <linux@roeck-us.net> wrote:
>>>>
>>>> On 5/27/21 7:58 AM, Robert Marko wrote:
>>>> [ ... ]
>>>>
>>>>>>>>>> I tried applying the block support for mv64xx as well:
>>>>>>>>>> https://patchwork.ozlabs.org/project/linux-i2c/patch/20200118115820.9080-1-fuga@studiofuga.com/
>>>>>>>>
>>>>>>>> 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.
>>>>>
>>>>
>>>> Is the i2c controller compatible with marvell,mv78230-i2c ?
>>>> The block transfers would not work in that case. Let me know
>>>> and I'll send you a patch that might fix it.
>>>
>>> Yes, the CPU is Armada 7040 and I can see that compatible is
>>> marvell,mv78230-i2c indeed.
>>>
>>> It would be great if you have the patch,
>>
>> See below.
> 
> I can confirm that this does indeed enable block reads and
> i2c_smbus_read_block_data()
> works now.
> 
> PMBUS_MFR_ID and PMBUS_MFR_MODEL are indeed populated.
> 

Excellent.

Guenter

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

[Guenter Roeck]

On Thu, May 27, 2021 at 09:43:33PM +0200, Robert Marko wrote:
[ ... ]
> 
> I can confirm that this does indeed enable block reads and
> i2c_smbus_read_block_data()
> works now.
> 

Follow-up:

> > +static void
> > +mv64xxx_i2c_do_read_data(struct mv64xxx_i2c_data *drv_data)
> > +{
> > +       u8 data;
> > +
> > +       data = readl(drv_data->reg_base + drv_data->reg_offsets.data);
> > +       drv_data->msg->buf[drv_data->byte_posn++] = data;
> > +
> > +       if (drv_data->msg->flags & I2C_M_RECV_LEN) {
> > +               if (!data || data > I2C_SMBUS_BLOCK_MAX) {
> > +                       /*
> > +                        * FIXME
> > +                        * Abort and report error. Needs to be
> > +                        * verified/tested on real hardware.
> > +                        */
> > +                       drv_data->rc = -EPROTO;
> > +                       mv64xxx_i2c_do_send_stop(drv_data);
> > +                       return;

Can you possibly test if this works ? Trying a block read on
any register which returns 0 or > 32 as first byte should do.

Thanks,
Guenter

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

[Guenter Roeck]

On 5/21/21 1:36 AM, Robert Marko wrote:
[ ... ]
>> 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
> 

Ah, so this is not a driver for a power supply from DeltaPSU,
but a power supply from Delta Networks Technology Corporation,
as used in that company's TN48M-POE switch. That is a world
of difference, even though the parent company seems to be the
same. I am not sure if, based on this information, the driver
should claim to be for "Delta DPS-920AB PSU" in the first place.

Can you run a block read on MFR_MODEL and MFG_SERIAL ?
That might give us an idea about the actual manufacturer
and model of this power supply.

Also, isn't that the same power supply for which you were
trying to add another hwmon driver to display some of its
status information, obtained from some CPLD ?

Thanks,
Guenter

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

[Robert Marko]

On Fri, May 21, 2021 at 1:41 PM Guenter Roeck <linux@roeck-us.net> wrote:
>
> On 5/21/21 1:36 AM, Robert Marko wrote:
> [ ... ]
> >> 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
> >
>
> Ah, so this is not a driver for a power supply from DeltaPSU,
> but a power supply from Delta Networks Technology Corporation,
> as used in that company's TN48M-POE switch. That is a world
> of difference, even though the parent company seems to be the
> same. I am not sure if, based on this information, the driver
> should claim to be for "Delta DPS-920AB PSU" in the first place.

It's actually a PSU from Delta Electronics INC, Delta Networks are just using
it inside of the Delta Networks TN48M-DN-P switch.
I checked the label on the PSU-s.
>
> Can you run a block read on MFR_MODEL and MFG_SERIAL ?
> That might give us an idea about the actual manufacturer
> and model of this power supply.

MFG_SERIAL is just a bunch of 0xf-s, but MFR_MODEL has something.
However, the Armada 7040 I2C adapter cannot do block reads although
it returns 11 bytes but it's just zeros.
>
> Also, isn't that the same power supply for which you were
> trying to add another hwmon driver to display some of its
> status information, obtained from some CPLD ?

This and one more as the non-PoE version of the TN48M-DN switch
has a single 150W PSU that does not support PMBus, but the CPLD
always provides presence information and Power Good status.
>
> Thanks,
> Guenter



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

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

[Guenter Roeck]

On 5/21/21 5:33 AM, Robert Marko wrote:
> On Fri, May 21, 2021 at 1:41 PM Guenter Roeck <linux@roeck-us.net> wrote:
>>
>> On 5/21/21 1:36 AM, Robert Marko wrote:
>> [ ... ]
>>>> 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
>>>
>>
>> Ah, so this is not a driver for a power supply from DeltaPSU,
>> but a power supply from Delta Networks Technology Corporation,
>> as used in that company's TN48M-POE switch. That is a world
>> of difference, even though the parent company seems to be the
>> same. I am not sure if, based on this information, the driver
>> should claim to be for "Delta DPS-920AB PSU" in the first place.
> 
> It's actually a PSU from Delta Electronics INC, Delta Networks are just using
> it inside of the Delta Networks TN48M-DN-P switch.
> I checked the label on the PSU-s.

Ok, thanks. Guess we'll have to live with that.

>>
>> Can you run a block read on MFR_MODEL and MFG_SERIAL ?
>> That might give us an idea about the actual manufacturer
>> and model of this power supply.
> 
> MFG_SERIAL is just a bunch of 0xf-s, but MFR_MODEL has something.
> However, the Armada 7040 I2C adapter cannot do block reads although
> it returns 11 bytes but it's just zeros.

Hmm, it seems more likely that the field is empty. Block read
isn't really different from other read operations.

Thanks,
Guenter

>>
>> Also, isn't that the same power supply for which you were
>> trying to add another hwmon driver to display some of its
>> status information, obtained from some CPLD ?
> 
> This and one more as the non-PoE version of the TN48M-DN switch
> has a single 150W PSU that does not support PMBus, but the CPLD
> always provides presence information and Power Good status.
>>
>> Thanks,
>> Guenter
> 
> 
>