[PATCH v1 0/4] Support pli1209bc Digital Supervisor

[PATCH v1 0/4] Support pli1209bc Digital Supervisor

[Marcello Sylvester Bauer]

Hi,

This patch set adds support for PLI1209BC Digital Supervisor from Vicor
Corporation. It replaces the previous submitted driver "bcm6123" [1],
since there are multiple digital supervisors, which uses BCMs in different
configurations [2].

[1]: https://www.spinics.net/lists/linux-hwmon/msg14097.html
[2]: https://www.spinics.net/lists/linux-hwmon/msg14123.html

Marcello Sylvester Bauer (4):
  dt-bindings: vendor-prefixes: add Vicor Corporation
  dt-bindings:trivial-devices: Add pli1209bc
  pmbus: Add support for pli1209bc
  pmbus (pli1209bc): Add regulator support

 .../devicetree/bindings/trivial-devices.yaml  |   2 +
 .../devicetree/bindings/vendor-prefixes.yaml  |   2 +
 Documentation/hwmon/pli1209bc.rst             |  73 ++++++++++
 drivers/hwmon/pmbus/Kconfig                   |  17 +++
 drivers/hwmon/pmbus/Makefile                  |   1 +
 drivers/hwmon/pmbus/pli1209bc.c               | 137 ++++++++++++++++++
 6 files changed, 232 insertions(+)
 create mode 100644 Documentation/hwmon/pli1209bc.rst
 create mode 100644 drivers/hwmon/pmbus/pli1209bc.c

-- 
2.34.1

[PATCH v1 1/4] dt-bindings: vendor-prefixes: add Vicor Corporation

[Marcello Sylvester Bauer]

Add vendor prefix for Vicor Corporation.

Signed-off-by: Marcello Sylvester Bauer <sylv@sylv.io>
---
 Documentation/devicetree/bindings/vendor-prefixes.yaml | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/Documentation/devicetree/bindings/vendor-prefixes.yaml b/Documentation/devicetree/bindings/vendor-prefixes.yaml
index 294093d45a23..047a83a089ce 100644
--- a/Documentation/devicetree/bindings/vendor-prefixes.yaml
+++ b/Documentation/devicetree/bindings/vendor-prefixes.yaml
@@ -1298,6 +1298,8 @@ patternProperties:
     description: Vertexcom Technologies, Inc.
   "^via,.*":
     description: VIA Technologies, Inc.
+  "^vicor,.*":
+    description: Vicor Corporation
   "^videostrong,.*":
     description: Videostrong Technology Co., Ltd.
   "^virtio,.*":
-- 
2.34.1

[PATCH v1 2/4] dt-bindings:trivial-devices: Add pli1209bc

[Marcello Sylvester Bauer]

Add trivial device entry for PLI1209BC Digital Supervisor from Vicor
Corporation.

Signed-off-by: Marcello Sylvester Bauer <sylv@sylv.io>
---
 Documentation/devicetree/bindings/trivial-devices.yaml | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/Documentation/devicetree/bindings/trivial-devices.yaml b/Documentation/devicetree/bindings/trivial-devices.yaml
index 091792ba993e..d03d90360aa0 100644
--- a/Documentation/devicetree/bindings/trivial-devices.yaml
+++ b/Documentation/devicetree/bindings/trivial-devices.yaml
@@ -354,6 +354,8 @@ properties:
           - ti,tps544c25
             # Winbond/Nuvoton H/W Monitor
           - winbond,w83793
+            # Vicor Corporation Digital Supervisor
+          - vicor,pli1209bc
             # i2c trusted platform module (TPM)
           - winbond,wpct301
 
-- 
2.34.1

[PATCH v1 3/4] pmbus: Add support for pli1209bc

[Marcello Sylvester Bauer]

PLI1209BC is a Digital Supervisor from Vicor Corporation.

Signed-off-by: Marcello Sylvester Bauer <sylv@sylv.io>
---
 Documentation/hwmon/pli1209bc.rst |  73 +++++++++++++++++++++
 drivers/hwmon/pmbus/Kconfig       |   9 +++
 drivers/hwmon/pmbus/Makefile      |   1 +
 drivers/hwmon/pmbus/pli1209bc.c   | 104 ++++++++++++++++++++++++++++++
 4 files changed, 187 insertions(+)
 create mode 100644 Documentation/hwmon/pli1209bc.rst
 create mode 100644 drivers/hwmon/pmbus/pli1209bc.c

diff --git a/Documentation/hwmon/pli1209bc.rst b/Documentation/hwmon/pli1209bc.rst
new file mode 100644
index 000000000000..a3f686d03cf2
--- /dev/null
+++ b/Documentation/hwmon/pli1209bc.rst
@@ -0,0 +1,73 @@
+Kernel driver pli1209bc
+=======================
+
+Supported chips:
+
+  * Digital Supervisor PLI1209BC
+
+    Prefix: 'pli1209bc'
+
+    Addresses scanned: 0x50 - 0x5F
+
+    Datasheet: https://www.vicorpower.com/documents/datasheets/ds-PLI1209BCxyzz-VICOR.pdf
+
+Authors:
+    - Marcello Sylvester Bauer <sylv@sylv.io>
+
+Description
+-----------
+
+The Vicor PLI1209BC is an isolated digital power system supervisor thatprovides
+a communication interface between a host processor and one Bus Converter Module
+(BCM). The PLI communicates with a system controller via a PMBus compatible
+interface over an isolated UART interface. Through the PLI, the host processor
+can configure, set protection limits, and monitor the BCM.
+
+Sysfs entries
+-------------
+
+======================= ========================================================
+in1_label		"vin2"
+in1_input		Input voltage.
+in1_rated_min		Minimum rated input voltage.
+in1_rated_max		Maximum rated input voltage.
+in1_max			Maximum input voltage.
+in1_max_alarm		Input voltage high alarm.
+in1_crit		Critical input voltage.
+in1_crit_alarm		Input voltage critical alarm.
+
+in2_label		"vout2"
+in2_input		Output voltage.
+in2_rated_min		Minimum rated output voltage.
+in2_rated_max		Maximum rated output voltage.
+in2_alarm		Output voltage alarm
+
+curr1_label		"iin2"
+curr1_input		Input current.
+curr1_max		Maximum input current.
+curr1_max_alarm		Maximum input current high alarm.
+curr1_crit		Critical input current.
+curr1_crit_alarm	Input current critical alarm.
+
+curr2_label		"iout2"
+curr2_input		Output current.
+curr2_crit		Critical output current.
+curr2_crit_alarm	Output current critical alarm.
+curr2_max		Maximum output current.
+curr2_max_alarm		Output current high alarm.
+
+power1_label		"pin2"
+power1_input		Input power.
+power1_alarm		Input power alarm.
+
+power2_label		"pout2"
+power2_input		Output power.
+power2_rated_max	Maximum rated output power.
+
+temp1_input		Die temperature.
+temp1_alarm		Die temperature alarm.
+temp1_max		Maximum die temperature.
+temp1_max_alarm		Die temperature high alarm.
+temp1_crit		Critical die temperature.
+temp1_crit_alarm	Die temperature critical alarm.
+======================= ========================================================
diff --git a/drivers/hwmon/pmbus/Kconfig b/drivers/hwmon/pmbus/Kconfig
index c96f7b7338bd..831db423bea0 100644
--- a/drivers/hwmon/pmbus/Kconfig
+++ b/drivers/hwmon/pmbus/Kconfig
@@ -310,6 +310,15 @@ config SENSORS_PIM4328
 	  This driver can also be built as a module. If so, the module will
 	  be called pim4328.
 
+config SENSORS_PLI1209BC
+	tristate "Vicor PLI1209BC"
+	help
+	  If you say yes here you get hardware monitoring support for Vicor
+	  PLI1209BC Digital Supervisor.
+
+	  This driver can also be built as a module. If so, the module will
+	  be called pli1209bc.
+
 config SENSORS_PM6764TR
 	tristate "ST PM6764TR"
 	help
diff --git a/drivers/hwmon/pmbus/Makefile b/drivers/hwmon/pmbus/Makefile
index e5935f70c9e0..7ce74e3b8552 100644
--- a/drivers/hwmon/pmbus/Makefile
+++ b/drivers/hwmon/pmbus/Makefile
@@ -34,6 +34,7 @@ obj-$(CONFIG_SENSORS_MP2888)	+= mp2888.o
 obj-$(CONFIG_SENSORS_MP2975)	+= mp2975.o
 obj-$(CONFIG_SENSORS_MP5023)	+= mp5023.o
 obj-$(CONFIG_SENSORS_PM6764TR)	+= pm6764tr.o
+obj-$(CONFIG_SENSORS_PLI1209BC)	+= pli1209bc.o
 obj-$(CONFIG_SENSORS_PXE1610)	+= pxe1610.o
 obj-$(CONFIG_SENSORS_Q54SJ108A2)	+= q54sj108a2.o
 obj-$(CONFIG_SENSORS_STPDDC60)	+= stpddc60.o
diff --git a/drivers/hwmon/pmbus/pli1209bc.c b/drivers/hwmon/pmbus/pli1209bc.c
new file mode 100644
index 000000000000..da345eb105fd
--- /dev/null
+++ b/drivers/hwmon/pmbus/pli1209bc.c
@@ -0,0 +1,104 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Hardware monitoring driver for Vicor PLI1209BC Digital Supervisor
+ *
+ * Copyright (c) 2022 9elements GmbH
+ */
+
+#include <linux/i2c.h>
+#include <linux/module.h>
+#include <linux/pmbus.h>
+#include "pmbus.h"
+
+/*
+ * The capability command is only supported at page 0. Probing the device while
+ * the page register is set to 1 will falsely enable PEC support. Disable
+ * capability probing accordingly, since the PLI1209BC does not have any
+ * additional capabilities.
+ */
+static struct pmbus_platform_data pli1209bc_plat_data = {
+	.flags = PMBUS_NO_CAPABILITY,
+};
+
+static int pli1209bc_read_word_data(struct i2c_client *client, int page,
+				    int phase, int reg)
+{
+	int data;
+
+	switch (reg) {
+	/* PMBUS_READ_PIN uses a direct format with R=1 */
+	case PMBUS_READ_PIN:
+		data = pmbus_read_word_data(client, page, phase, reg);
+		if (data < 0)
+			return data;
+		return div_s64(data + 5LL, 10L);
+	default:
+		return -ENODATA;
+	}
+}
+
+static struct pmbus_driver_info pli1209bc_info = {
+	.pages = 2,
+	.format[PSC_VOLTAGE_IN] = direct,
+	.format[PSC_VOLTAGE_OUT] = direct,
+	.format[PSC_CURRENT_IN] = direct,
+	.format[PSC_CURRENT_OUT] = direct,
+	.format[PSC_POWER] = linear,
+	.format[PSC_TEMPERATURE] = linear,
+	.m[PSC_VOLTAGE_IN] = 1,
+	.b[PSC_VOLTAGE_IN] = 0,
+	.R[PSC_VOLTAGE_IN] = 1,
+	.m[PSC_VOLTAGE_OUT] = 1,
+	.b[PSC_VOLTAGE_OUT] = 0,
+	.R[PSC_VOLTAGE_OUT] = 1,
+	.m[PSC_CURRENT_IN] = 1,
+	.b[PSC_CURRENT_IN] = 0,
+	.R[PSC_CURRENT_IN] = 3,
+	.m[PSC_CURRENT_OUT] = 1,
+	.b[PSC_CURRENT_OUT] = 0,
+	.R[PSC_CURRENT_OUT] = 2,
+	.func[0] = 0, /* supervisor summing page without voltage readings */
+	.func[1] = PMBUS_HAVE_VIN | PMBUS_HAVE_VOUT
+	    | PMBUS_HAVE_IIN | PMBUS_HAVE_IOUT
+	    | PMBUS_HAVE_PIN | PMBUS_HAVE_POUT
+	    | PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP
+	    | PMBUS_HAVE_STATUS_IOUT | PMBUS_HAVE_STATUS_INPUT,
+	.read_word_data = pli1209bc_read_word_data,
+};
+
+static int pli1209bc_probe(struct i2c_client *client)
+{
+	client->dev.platform_data = &pli1209bc_plat_data;
+	return pmbus_do_probe(client, &pli1209bc_info);
+}
+
+static const struct i2c_device_id pli1209bc_id[] = {
+	{"pli1209bc", 0},
+	{}
+};
+
+MODULE_DEVICE_TABLE(i2c, pli1209bc_id);
+
+#ifdef CONFIG_OF
+static const struct of_device_id pli1209bc_of_match[] = {
+	{ .compatible = "vicor,pli1209bc" },
+	{ },
+};
+MODULE_DEVICE_TABLE(of, pli1209bc_of_match);
+#endif
+
+/* This is the driver that will be inserted */
+static struct i2c_driver pli1209bc_driver = {
+	.driver = {
+		   .name = "pli1209bc",
+		   .of_match_table = of_match_ptr(pli1209bc_of_match),
+		   },
+	.probe_new = pli1209bc_probe,
+	.id_table = pli1209bc_id,
+};
+
+module_i2c_driver(pli1209bc_driver);
+
+MODULE_AUTHOR("Marcello Sylvester Bauer <sylv@sylv.io>");
+MODULE_DESCRIPTION("PMBus driver for Vicor PLI1209BC");
+MODULE_LICENSE("GPL");
-- 
2.34.1

Re: [PATCH v1 3/4] pmbus: Add support for pli1209bc

[Guenter Roeck]

On 2/11/22 09:17, Marcello Sylvester Bauer wrote:
> PLI1209BC is a Digital Supervisor from Vicor Corporation.
> 
> Signed-off-by: Marcello Sylvester Bauer <sylv@sylv.io>
> ---
>   Documentation/hwmon/pli1209bc.rst |  73 +++++++++++++++++++++
>   drivers/hwmon/pmbus/Kconfig       |   9 +++
>   drivers/hwmon/pmbus/Makefile      |   1 +
>   drivers/hwmon/pmbus/pli1209bc.c   | 104 ++++++++++++++++++++++++++++++
>   4 files changed, 187 insertions(+)
>   create mode 100644 Documentation/hwmon/pli1209bc.rst
>   create mode 100644 drivers/hwmon/pmbus/pli1209bc.c
> 
> diff --git a/Documentation/hwmon/pli1209bc.rst b/Documentation/hwmon/pli1209bc.rst
> new file mode 100644
> index 000000000000..a3f686d03cf2
> --- /dev/null
> +++ b/Documentation/hwmon/pli1209bc.rst
> @@ -0,0 +1,73 @@
> +Kernel driver pli1209bc
> +=======================
> +
> +Supported chips:
> +
> +  * Digital Supervisor PLI1209BC
> +
> +    Prefix: 'pli1209bc'
> +
> +    Addresses scanned: 0x50 - 0x5F
> +
> +    Datasheet: https://www.vicorpower.com/documents/datasheets/ds-PLI1209BCxyzz-VICOR.pdf
> +
> +Authors:
> +    - Marcello Sylvester Bauer <sylv@sylv.io>
> +
> +Description
> +-----------
> +
> +The Vicor PLI1209BC is an isolated digital power system supervisor thatprovides
> +a communication interface between a host processor and one Bus Converter Module
> +(BCM). The PLI communicates with a system controller via a PMBus compatible
> +interface over an isolated UART interface. Through the PLI, the host processor
> +can configure, set protection limits, and monitor the BCM.
> +
> +Sysfs entries
> +-------------
> +
> +======================= ========================================================
> +in1_label		"vin2"
> +in1_input		Input voltage.
> +in1_rated_min		Minimum rated input voltage.
> +in1_rated_max		Maximum rated input voltage.
> +in1_max			Maximum input voltage.
> +in1_max_alarm		Input voltage high alarm.
> +in1_crit		Critical input voltage.
> +in1_crit_alarm		Input voltage critical alarm.
> +
> +in2_label		"vout2"
> +in2_input		Output voltage.
> +in2_rated_min		Minimum rated output voltage.
> +in2_rated_max		Maximum rated output voltage.
> +in2_alarm		Output voltage alarm
> +
> +curr1_label		"iin2"
> +curr1_input		Input current.
> +curr1_max		Maximum input current.
> +curr1_max_alarm		Maximum input current high alarm.
> +curr1_crit		Critical input current.
> +curr1_crit_alarm	Input current critical alarm.
> +
> +curr2_label		"iout2"
> +curr2_input		Output current.
> +curr2_crit		Critical output current.
> +curr2_crit_alarm	Output current critical alarm.
> +curr2_max		Maximum output current.
> +curr2_max_alarm		Output current high alarm.
> +
> +power1_label		"pin2"
> +power1_input		Input power.
> +power1_alarm		Input power alarm.
> +
> +power2_label		"pout2"
> +power2_input		Output power.
> +power2_rated_max	Maximum rated output power.
> +
> +temp1_input		Die temperature.
> +temp1_alarm		Die temperature alarm.
> +temp1_max		Maximum die temperature.
> +temp1_max_alarm		Die temperature high alarm.
> +temp1_crit		Critical die temperature.
> +temp1_crit_alarm	Die temperature critical alarm.
> +======================= ========================================================
> diff --git a/drivers/hwmon/pmbus/Kconfig b/drivers/hwmon/pmbus/Kconfig
> index c96f7b7338bd..831db423bea0 100644
> --- a/drivers/hwmon/pmbus/Kconfig
> +++ b/drivers/hwmon/pmbus/Kconfig
> @@ -310,6 +310,15 @@ config SENSORS_PIM4328
>   	  This driver can also be built as a module. If so, the module will
>   	  be called pim4328.
>   
> +config SENSORS_PLI1209BC
> +	tristate "Vicor PLI1209BC"
> +	help
> +	  If you say yes here you get hardware monitoring support for Vicor
> +	  PLI1209BC Digital Supervisor.
> +
> +	  This driver can also be built as a module. If so, the module will
> +	  be called pli1209bc.
> +
>   config SENSORS_PM6764TR
>   	tristate "ST PM6764TR"
>   	help
> diff --git a/drivers/hwmon/pmbus/Makefile b/drivers/hwmon/pmbus/Makefile
> index e5935f70c9e0..7ce74e3b8552 100644
> --- a/drivers/hwmon/pmbus/Makefile
> +++ b/drivers/hwmon/pmbus/Makefile
> @@ -34,6 +34,7 @@ obj-$(CONFIG_SENSORS_MP2888)	+= mp2888.o
>   obj-$(CONFIG_SENSORS_MP2975)	+= mp2975.o
>   obj-$(CONFIG_SENSORS_MP5023)	+= mp5023.o
>   obj-$(CONFIG_SENSORS_PM6764TR)	+= pm6764tr.o
> +obj-$(CONFIG_SENSORS_PLI1209BC)	+= pli1209bc.o
>   obj-$(CONFIG_SENSORS_PXE1610)	+= pxe1610.o
>   obj-$(CONFIG_SENSORS_Q54SJ108A2)	+= q54sj108a2.o
>   obj-$(CONFIG_SENSORS_STPDDC60)	+= stpddc60.o
> diff --git a/drivers/hwmon/pmbus/pli1209bc.c b/drivers/hwmon/pmbus/pli1209bc.c
> new file mode 100644
> index 000000000000..da345eb105fd
> --- /dev/null
> +++ b/drivers/hwmon/pmbus/pli1209bc.c
> @@ -0,0 +1,104 @@
> +// SPDX-License-Identifier: GPL-2.0+
> +/*
> + * Hardware monitoring driver for Vicor PLI1209BC Digital Supervisor
> + *
> + * Copyright (c) 2022 9elements GmbH
> + */
> +
> +#include <linux/i2c.h>
> +#include <linux/module.h>
> +#include <linux/pmbus.h>
> +#include "pmbus.h"
> +
> +/*
> + * The capability command is only supported at page 0. Probing the device while
> + * the page register is set to 1 will falsely enable PEC support. Disable
> + * capability probing accordingly, since the PLI1209BC does not have any
> + * additional capabilities.
> + */
> +static struct pmbus_platform_data pli1209bc_plat_data = {
> +	.flags = PMBUS_NO_CAPABILITY,
> +};
> +
> +static int pli1209bc_read_word_data(struct i2c_client *client, int page,
> +				    int phase, int reg)
> +{
> +	int data;
> +
> +	switch (reg) {
> +	/* PMBUS_READ_PIN uses a direct format with R=1 */
> +	case PMBUS_READ_PIN:
> +		data = pmbus_read_word_data(client, page, phase, reg);
> +		if (data < 0)
> +			return data;
> +		return div_s64(data + 5LL, 10L);

This results in a loss of precision. I think it would be better to avoid that
and instead model the output power as direct format with R=1, and multiply
register values reported for PMBUS_READ_POUT with 10.

> +	default:
> +		return -ENODATA;
> +	}
> +}
> +
> +static struct pmbus_driver_info pli1209bc_info = {
> +	.pages = 2,
> +	.format[PSC_VOLTAGE_IN] = direct,
> +	.format[PSC_VOLTAGE_OUT] = direct,
> +	.format[PSC_CURRENT_IN] = direct,
> +	.format[PSC_CURRENT_OUT] = direct,
> +	.format[PSC_POWER] = linear,
> +	.format[PSC_TEMPERATURE] = linear,

Those look like direct values to me. Linear would mean there is a
mantissa and an exponent, but I don't see that in the datasheet.
Please clarify; we don't want to have power values of 1024 and
above show up as negative numbers.

> +	.m[PSC_VOLTAGE_IN] = 1,
> +	.b[PSC_VOLTAGE_IN] = 0,
> +	.R[PSC_VOLTAGE_IN] = 1,
> +	.m[PSC_VOLTAGE_OUT] = 1,
> +	.b[PSC_VOLTAGE_OUT] = 0,
> +	.R[PSC_VOLTAGE_OUT] = 1,
> +	.m[PSC_CURRENT_IN] = 1,
> +	.b[PSC_CURRENT_IN] = 0,
> +	.R[PSC_CURRENT_IN] = 3,
> +	.m[PSC_CURRENT_OUT] = 1,
> +	.b[PSC_CURRENT_OUT] = 0,
> +	.R[PSC_CURRENT_OUT] = 2,
> +	.func[0] = 0, /* supervisor summing page without voltage readings */

As far as I can see from the manual, the actually reported values for other
attributes match those of page 1, making the values on page 0 redundant.
I think this should be mentioned in a comment to avoid confusion.


> +	.func[1] = PMBUS_HAVE_VIN | PMBUS_HAVE_VOUT
> +	    | PMBUS_HAVE_IIN | PMBUS_HAVE_IOUT
> +	    | PMBUS_HAVE_PIN | PMBUS_HAVE_POUT
> +	    | PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP
> +	    | PMBUS_HAVE_STATUS_IOUT | PMBUS_HAVE_STATUS_INPUT,
> +	.read_word_data = pli1209bc_read_word_data,
> +};
> +
> +static int pli1209bc_probe(struct i2c_client *client)
> +{
> +	client->dev.platform_data = &pli1209bc_plat_data;
> +	return pmbus_do_probe(client, &pli1209bc_info);
> +}
> +
> +static const struct i2c_device_id pli1209bc_id[] = {
> +	{"pli1209bc", 0},
> +	{}
> +};
> +
> +MODULE_DEVICE_TABLE(i2c, pli1209bc_id);
> +
> +#ifdef CONFIG_OF
> +static const struct of_device_id pli1209bc_of_match[] = {
> +	{ .compatible = "vicor,pli1209bc" },
> +	{ },
> +};
> +MODULE_DEVICE_TABLE(of, pli1209bc_of_match);
> +#endif
> +
> +/* This is the driver that will be inserted */

Pretty useless comment.

> +static struct i2c_driver pli1209bc_driver = {
> +	.driver = {
> +		   .name = "pli1209bc",
> +		   .of_match_table = of_match_ptr(pli1209bc_of_match),
> +		   },
> +	.probe_new = pli1209bc_probe,
> +	.id_table = pli1209bc_id,
> +};
> +
> +module_i2c_driver(pli1209bc_driver);
> +
> +MODULE_AUTHOR("Marcello Sylvester Bauer <sylv@sylv.io>");
> +MODULE_DESCRIPTION("PMBus driver for Vicor PLI1209BC");
> +MODULE_LICENSE("GPL");

Re: [PATCH v1 3/4] pmbus: Add support for pli1209bc

[sylv]

On Fri, 2022-02-11 at 11:40 -0800, Guenter Roeck wrote:
> On 2/11/22 09:17, Marcello Sylvester Bauer wrote:
> > PLI1209BC is a Digital Supervisor from Vicor Corporation.
> > 
> > Signed-off-by: Marcello Sylvester Bauer <sylv@sylv.io>
> > ---
> >   Documentation/hwmon/pli1209bc.rst |  73 +++++++++++++++++++++
> >   drivers/hwmon/pmbus/Kconfig       |   9 +++
> >   drivers/hwmon/pmbus/Makefile      |   1 +
> >   drivers/hwmon/pmbus/pli1209bc.c   | 104
> > ++++++++++++++++++++++++++++++
> >   4 files changed, 187 insertions(+)
> >   create mode 100644 Documentation/hwmon/pli1209bc.rst
> >   create mode 100644 drivers/hwmon/pmbus/pli1209bc.c
> > 
> > diff --git a/Documentation/hwmon/pli1209bc.rst
> > b/Documentation/hwmon/pli1209bc.rst
> > new file mode 100644
> > index 000000000000..a3f686d03cf2
> > --- /dev/null
> > +++ b/Documentation/hwmon/pli1209bc.rst
> > @@ -0,0 +1,73 @@
> > +Kernel driver pli1209bc
> > +=======================
> > +
> > +Supported chips:
> > +
> > +  * Digital Supervisor PLI1209BC
> > +
> > +    Prefix: 'pli1209bc'
> > +
> > +    Addresses scanned: 0x50 - 0x5F
> > +
> > +    Datasheet:
> > https://www.vicorpower.com/documents/datasheets/ds-PLI1209BCxyzz-VICOR.pdf
> > +
> > +Authors:
> > +    - Marcello Sylvester Bauer <sylv@sylv.io>
> > +
> > +Description
> > +-----------
> > +
> > +The Vicor PLI1209BC is an isolated digital power system supervisor
> > thatprovides
> > +a communication interface between a host processor and one Bus
> > Converter Module
> > +(BCM). The PLI communicates with a system controller via a PMBus
> > compatible
> > +interface over an isolated UART interface. Through the PLI, the
> > host processor
> > +can configure, set protection limits, and monitor the BCM.
> > +
> > +Sysfs entries
> > +-------------
> > +
> > +=======================
> > ========================================================
> > +in1_label              "vin2"
> > +in1_input              Input voltage.
> > +in1_rated_min          Minimum rated input voltage.
> > +in1_rated_max          Maximum rated input voltage.
> > +in1_max                        Maximum input voltage.
> > +in1_max_alarm          Input voltage high alarm.
> > +in1_crit               Critical input voltage.
> > +in1_crit_alarm         Input voltage critical alarm.
> > +
> > +in2_label              "vout2"
> > +in2_input              Output voltage.
> > +in2_rated_min          Minimum rated output voltage.
> > +in2_rated_max          Maximum rated output voltage.
> > +in2_alarm              Output voltage alarm
> > +
> > +curr1_label            "iin2"
> > +curr1_input            Input current.
> > +curr1_max              Maximum input current.
> > +curr1_max_alarm                Maximum input current high alarm.
> > +curr1_crit             Critical input current.
> > +curr1_crit_alarm       Input current critical alarm.
> > +
> > +curr2_label            "iout2"
> > +curr2_input            Output current.
> > +curr2_crit             Critical output current.
> > +curr2_crit_alarm       Output current critical alarm.
> > +curr2_max              Maximum output current.
> > +curr2_max_alarm                Output current high alarm.
> > +
> > +power1_label           "pin2"
> > +power1_input           Input power.
> > +power1_alarm           Input power alarm.
> > +
> > +power2_label           "pout2"
> > +power2_input           Output power.
> > +power2_rated_max       Maximum rated output power.
> > +
> > +temp1_input            Die temperature.
> > +temp1_alarm            Die temperature alarm.
> > +temp1_max              Maximum die temperature.
> > +temp1_max_alarm                Die temperature high alarm.
> > +temp1_crit             Critical die temperature.
> > +temp1_crit_alarm       Die temperature critical alarm.
> > +=======================
> > ========================================================
> > diff --git a/drivers/hwmon/pmbus/Kconfig
> > b/drivers/hwmon/pmbus/Kconfig
> > index c96f7b7338bd..831db423bea0 100644
> > --- a/drivers/hwmon/pmbus/Kconfig
> > +++ b/drivers/hwmon/pmbus/Kconfig
> > @@ -310,6 +310,15 @@ config SENSORS_PIM4328
> >           This driver can also be built as a module. If so, the
> > module will
> >           be called pim4328.
> >   
> > +config SENSORS_PLI1209BC
> > +       tristate "Vicor PLI1209BC"
> > +       help
> > +         If you say yes here you get hardware monitoring support
> > for Vicor
> > +         PLI1209BC Digital Supervisor.
> > +
> > +         This driver can also be built as a module. If so, the
> > module will
> > +         be called pli1209bc.
> > +
> >   config SENSORS_PM6764TR
> >         tristate "ST PM6764TR"
> >         help
> > diff --git a/drivers/hwmon/pmbus/Makefile
> > b/drivers/hwmon/pmbus/Makefile
> > index e5935f70c9e0..7ce74e3b8552 100644
> > --- a/drivers/hwmon/pmbus/Makefile
> > +++ b/drivers/hwmon/pmbus/Makefile
> > @@ -34,6 +34,7 @@ obj-$(CONFIG_SENSORS_MP2888)  += mp2888.o
> >   obj-$(CONFIG_SENSORS_MP2975)  += mp2975.o
> >   obj-$(CONFIG_SENSORS_MP5023)  += mp5023.o
> >   obj-$(CONFIG_SENSORS_PM6764TR)        += pm6764tr.o
> > +obj-$(CONFIG_SENSORS_PLI1209BC)        += pli1209bc.o
> >   obj-$(CONFIG_SENSORS_PXE1610) += pxe1610.o
> >   obj-$(CONFIG_SENSORS_Q54SJ108A2)      += q54sj108a2.o
> >   obj-$(CONFIG_SENSORS_STPDDC60)        += stpddc60.o
> > diff --git a/drivers/hwmon/pmbus/pli1209bc.c
> > b/drivers/hwmon/pmbus/pli1209bc.c
> > new file mode 100644
> > index 000000000000..da345eb105fd
> > --- /dev/null
> > +++ b/drivers/hwmon/pmbus/pli1209bc.c
> > @@ -0,0 +1,104 @@
> > +// SPDX-License-Identifier: GPL-2.0+
> > +/*
> > + * Hardware monitoring driver for Vicor PLI1209BC Digital
> > Supervisor
> > + *
> > + * Copyright (c) 2022 9elements GmbH
> > + */
> > +
> > +#include <linux/i2c.h>
> > +#include <linux/module.h>
> > +#include <linux/pmbus.h>
> > +#include "pmbus.h"
> > +
> > +/*
> > + * The capability command is only supported at page 0. Probing the
> > device while
> > + * the page register is set to 1 will falsely enable PEC support.
> > Disable
> > + * capability probing accordingly, since the PLI1209BC does not
> > have any
> > + * additional capabilities.
> > + */
> > +static struct pmbus_platform_data pli1209bc_plat_data = {
> > +       .flags = PMBUS_NO_CAPABILITY,
> > +};
> > +
> > +static int pli1209bc_read_word_data(struct i2c_client *client, int
> > page,
> > +                                   int phase, int reg)
> > +{
> > +       int data;
> > +
> > +       switch (reg) {
> > +       /* PMBUS_READ_PIN uses a direct format with R=1 */
> > +       case PMBUS_READ_PIN:
> > +               data = pmbus_read_word_data(client, page, phase,
> > reg);
> > +               if (data < 0)
> > +                       return data;
> > +               return div_s64(data + 5LL, 10L);
> 
> This results in a loss of precision. I think it would be better to
> avoid that
> and instead model the output power as direct format with R=1, and
> multiply
> register values reported for PMBUS_READ_POUT with 10.
> 

Makes sense, ack.

> > +       default:
> > +               return -ENODATA;
> > +       }
> > +}
> > +
> > +static struct pmbus_driver_info pli1209bc_info = {
> > +       .pages = 2,
> > +       .format[PSC_VOLTAGE_IN] = direct,
> > +       .format[PSC_VOLTAGE_OUT] = direct,
> > +       .format[PSC_CURRENT_IN] = direct,
> > +       .format[PSC_CURRENT_OUT] = direct,
> > +       .format[PSC_POWER] = linear,
> > +       .format[PSC_TEMPERATURE] = linear,
> 
> Those look like direct values to me. Linear would mean there is a
> mantissa and an exponent, but I don't see that in the datasheet.
> Please clarify; we don't want to have power values of 1024 and
> above show up as negative numbers.

My bad. I misunderstood the meaning of linear and thought it means
direct m=1,R=0,b=0. Thanks.

> 
> > +       .m[PSC_VOLTAGE_IN] = 1,
> > +       .b[PSC_VOLTAGE_IN] = 0,
> > +       .R[PSC_VOLTAGE_IN] = 1,
> > +       .m[PSC_VOLTAGE_OUT] = 1,
> > +       .b[PSC_VOLTAGE_OUT] = 0,
> > +       .R[PSC_VOLTAGE_OUT] = 1,
> > +       .m[PSC_CURRENT_IN] = 1,
> > +       .b[PSC_CURRENT_IN] = 0,
> > +       .R[PSC_CURRENT_IN] = 3,
> > +       .m[PSC_CURRENT_OUT] = 1,
> > +       .b[PSC_CURRENT_OUT] = 0,
> > +       .R[PSC_CURRENT_OUT] = 2,
> > +       .func[0] = 0, /* supervisor summing page without voltage
> > readings */
> 
> As far as I can see from the manual, the actually reported values for
> other
> attributes match those of page 1, making the values on page 0
> redundant.
> I think this should be mentioned in a comment to avoid confusion.
> 

Sure, sgtm.

> 
> > +       .func[1] = PMBUS_HAVE_VIN | PMBUS_HAVE_VOUT
> > +           | PMBUS_HAVE_IIN | PMBUS_HAVE_IOUT
> > +           | PMBUS_HAVE_PIN | PMBUS_HAVE_POUT
> > +           | PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP
> > +           | PMBUS_HAVE_STATUS_IOUT | PMBUS_HAVE_STATUS_INPUT,
> > +       .read_word_data = pli1209bc_read_word_data,
> > +};
> > +
> > +static int pli1209bc_probe(struct i2c_client *client)
> > +{
> > +       client->dev.platform_data = &pli1209bc_plat_data;
> > +       return pmbus_do_probe(client, &pli1209bc_info);
> > +}
> > +
> > +static const struct i2c_device_id pli1209bc_id[] = {
> > +       {"pli1209bc", 0},
> > +       {}
> > +};
> > +
> > +MODULE_DEVICE_TABLE(i2c, pli1209bc_id);
> > +
> > +#ifdef CONFIG_OF
> > +static const struct of_device_id pli1209bc_of_match[] = {
> > +       { .compatible = "vicor,pli1209bc" },
> > +       { },
> > +};
> > +MODULE_DEVICE_TABLE(of, pli1209bc_of_match);
> > +#endif
> > +
> > +/* This is the driver that will be inserted */
> 
> Pretty useless comment.

ack.

Thanks for your quick review Guenter.

Marcello

> 
> > +static struct i2c_driver pli1209bc_driver = {
> > +       .driver = {
> > +                  .name = "pli1209bc",
> > +                  .of_match_table =
> > of_match_ptr(pli1209bc_of_match),
> > +                  },
> > +       .probe_new = pli1209bc_probe,
> > +       .id_table = pli1209bc_id,
> > +};
> > +
> > +module_i2c_driver(pli1209bc_driver);
> > +
> > +MODULE_AUTHOR("Marcello Sylvester Bauer <sylv@sylv.io>");
> > +MODULE_DESCRIPTION("PMBus driver for Vicor PLI1209BC");
> > +MODULE_LICENSE("GPL");
> 

Re: [PATCH v1 3/4] pmbus: Add support for pli1209bc

[kernel test robot]

Hi Marcello,

Thank you for the patch! Yet something to improve:

[auto build test ERROR on groeck-staging/hwmon-next]
[also build test ERROR on robh/for-next v5.17-rc3 next-20220211]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch]

url:    https://github.com/0day-ci/linux/commits/Marcello-Sylvester-Bauer/Support-pli1209bc-Digital-Supervisor/20220212-011956
base:   https://git.kernel.org/pub/scm/linux/kernel/git/groeck/linux-staging.git hwmon-next
config: hexagon-randconfig-r024-20220213 (https://download.01.org/0day-ci/archive/20220213/202202130705.3YDPfyow-lkp@intel.com/config)
compiler: clang version 15.0.0 (https://github.com/llvm/llvm-project c7eb84634519e6497be42f5fe323f9a04ed67127)
reproduce (this is a W=1 build):
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # https://github.com/0day-ci/linux/commit/0b0d15e123c13b2eb898502661b18d81ed87e325
        git remote add linux-review https://github.com/0day-ci/linux
        git fetch --no-tags linux-review Marcello-Sylvester-Bauer/Support-pli1209bc-Digital-Supervisor/20220212-011956
        git checkout 0b0d15e123c13b2eb898502661b18d81ed87e325
        # save the config file to linux build tree
        mkdir build_dir
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=hexagon SHELL=/bin/bash

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@intel.com>

All errors (new ones prefixed by >>, old ones prefixed by <<):

>> ERROR: modpost: module pli1209bc uses symbol pmbus_read_word_data from namespace PMBUS, but does not import it.
>> ERROR: modpost: module pli1209bc uses symbol pmbus_do_probe from namespace PMBUS, but does not import it.

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org

[PATCH v1 4/4] pmbus (pli1209bc): Add regulator support

[Marcello Sylvester Bauer]

Add regulator support for PLI1209BC Digital Supervisor.

Signed-off-by: Marcello Sylvester Bauer <sylv@sylv.io>
---
 drivers/hwmon/pmbus/Kconfig     |  8 ++++++++
 drivers/hwmon/pmbus/pli1209bc.c | 33 +++++++++++++++++++++++++++++++++
 2 files changed, 41 insertions(+)

diff --git a/drivers/hwmon/pmbus/Kconfig b/drivers/hwmon/pmbus/Kconfig
index 831db423bea0..e64e0f2d93c9 100644
--- a/drivers/hwmon/pmbus/Kconfig
+++ b/drivers/hwmon/pmbus/Kconfig
@@ -319,6 +319,14 @@ config SENSORS_PLI1209BC
 	  This driver can also be built as a module. If so, the module will
 	  be called pli1209bc.
 
+config SENSORS_PLI1209BC_REGULATOR
+	bool "Regulator support for PLI1209BC"
+	depends on SENSORS_PLI1209BC && REGULATOR
+	help
+	  If you say yes here you get regulator support for Vicor PLI1209BC
+	  Digital Supervisor.
+
+
 config SENSORS_PM6764TR
 	tristate "ST PM6764TR"
 	help
diff --git a/drivers/hwmon/pmbus/pli1209bc.c b/drivers/hwmon/pmbus/pli1209bc.c
index da345eb105fd..ec479b22aa10 100644
--- a/drivers/hwmon/pmbus/pli1209bc.c
+++ b/drivers/hwmon/pmbus/pli1209bc.c
@@ -8,6 +8,7 @@
 #include <linux/i2c.h>
 #include <linux/module.h>
 #include <linux/pmbus.h>
+#include <linux/regulator/driver.h>
 #include "pmbus.h"
 
 /*
@@ -32,11 +33,39 @@ static int pli1209bc_read_word_data(struct i2c_client *client, int page,
 		if (data < 0)
 			return data;
 		return div_s64(data + 5LL, 10L);
+#if IS_ENABLED(CONFIG_SENSORS_PLI1209BC_REGULATOR)
+	/*
+	 * PMBUS_READ_VOUT and PMBUS_READ_TEMPERATURE_1 returns invalid data,
+	 * when the BCM is turned off. Since it is not possible to return
+	 * ENODATA error, return zero instead.
+	 */
+	case PMBUS_READ_VOUT:
+	case PMBUS_READ_TEMPERATURE_1:
+		data = pmbus_read_word_data(client, page, phase,
+					    PMBUS_STATUS_WORD);
+		if (data < 0)
+			return data;
+		if (data & PB_STATUS_POWER_GOOD_N)
+			return 0L;
+		return pmbus_read_word_data(client, page, phase, reg);
+#endif
 	default:
 		return -ENODATA;
 	}
 }
 
+#if IS_ENABLED(CONFIG_SENSORS_PLI1209BC_REGULATOR)
+static const struct regulator_desc pli1209bc_reg_desc = {
+	.name = "vout2",
+	.id = 1,
+	.of_match = of_match_ptr("vout2"),
+	.regulators_node = of_match_ptr("regulators"),
+	.ops = &pmbus_regulator_ops,
+	.type = REGULATOR_VOLTAGE,
+	.owner = THIS_MODULE,
+};
+#endif
+
 static struct pmbus_driver_info pli1209bc_info = {
 	.pages = 2,
 	.format[PSC_VOLTAGE_IN] = direct,
@@ -64,6 +93,10 @@ static struct pmbus_driver_info pli1209bc_info = {
 	    | PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP
 	    | PMBUS_HAVE_STATUS_IOUT | PMBUS_HAVE_STATUS_INPUT,
 	.read_word_data = pli1209bc_read_word_data,
+#if IS_ENABLED(CONFIG_SENSORS_PLI1209BC_REGULATOR)
+	.num_regulators = 1,
+	.reg_desc = &pli1209bc_reg_desc,
+#endif
 };
 
 static int pli1209bc_probe(struct i2c_client *client)
-- 
2.34.1

Re: [PATCH v1 4/4] pmbus (pli1209bc): Add regulator support

[Guenter Roeck]

On 2/11/22 09:17, Marcello Sylvester Bauer wrote:
> Add regulator support for PLI1209BC Digital Supervisor.
> 
> Signed-off-by: Marcello Sylvester Bauer <sylv@sylv.io>
> ---
>   drivers/hwmon/pmbus/Kconfig     |  8 ++++++++
>   drivers/hwmon/pmbus/pli1209bc.c | 33 +++++++++++++++++++++++++++++++++
>   2 files changed, 41 insertions(+)
> 
> diff --git a/drivers/hwmon/pmbus/Kconfig b/drivers/hwmon/pmbus/Kconfig
> index 831db423bea0..e64e0f2d93c9 100644
> --- a/drivers/hwmon/pmbus/Kconfig
> +++ b/drivers/hwmon/pmbus/Kconfig
> @@ -319,6 +319,14 @@ config SENSORS_PLI1209BC
>   	  This driver can also be built as a module. If so, the module will
>   	  be called pli1209bc.
>   
> +config SENSORS_PLI1209BC_REGULATOR
> +	bool "Regulator support for PLI1209BC"
> +	depends on SENSORS_PLI1209BC && REGULATOR
> +	help
> +	  If you say yes here you get regulator support for Vicor PLI1209BC
> +	  Digital Supervisor.
> +
> +

Single empty line please

>   config SENSORS_PM6764TR
>   	tristate "ST PM6764TR"
>   	help
> diff --git a/drivers/hwmon/pmbus/pli1209bc.c b/drivers/hwmon/pmbus/pli1209bc.c
> index da345eb105fd..ec479b22aa10 100644
> --- a/drivers/hwmon/pmbus/pli1209bc.c
> +++ b/drivers/hwmon/pmbus/pli1209bc.c
> @@ -8,6 +8,7 @@
>   #include <linux/i2c.h>
>   #include <linux/module.h>
>   #include <linux/pmbus.h>
> +#include <linux/regulator/driver.h>
>   #include "pmbus.h"
>   
>   /*
> @@ -32,11 +33,39 @@ static int pli1209bc_read_word_data(struct i2c_client *client, int page,
>   		if (data < 0)
>   			return data;
>   		return div_s64(data + 5LL, 10L);
> +#if IS_ENABLED(CONFIG_SENSORS_PLI1209BC_REGULATOR)

I don't think this needs to be conditional.

> +	/*
> +	 * PMBUS_READ_VOUT and PMBUS_READ_TEMPERATURE_1 returns invalid data,

s/returns/return/ and no ','

> +	 * when the BCM is turned off. Since it is not possible to return
> +	 * ENODATA error, return zero instead.
> +	 */
> +	case PMBUS_READ_VOUT:
> +	case PMBUS_READ_TEMPERATURE_1:
> +		data = pmbus_read_word_data(client, page, phase,
> +					    PMBUS_STATUS_WORD);
> +		if (data < 0)
> +			return data;
> +		if (data & PB_STATUS_POWER_GOOD_N)
> +			return 0L;
> +		return pmbus_read_word_data(client, page, phase, reg);
> +#endif
>   	default:
>   		return -ENODATA;
>   	}
>   }
>   
> +#if IS_ENABLED(CONFIG_SENSORS_PLI1209BC_REGULATOR)
> +static const struct regulator_desc pli1209bc_reg_desc = {
> +	.name = "vout2",
> +	.id = 1,
> +	.of_match = of_match_ptr("vout2"),
> +	.regulators_node = of_match_ptr("regulators"),
> +	.ops = &pmbus_regulator_ops,
> +	.type = REGULATOR_VOLTAGE,
> +	.owner = THIS_MODULE,
> +};
> +#endif
> +
>   static struct pmbus_driver_info pli1209bc_info = {
>   	.pages = 2,
>   	.format[PSC_VOLTAGE_IN] = direct,
> @@ -64,6 +93,10 @@ static struct pmbus_driver_info pli1209bc_info = {
>   	    | PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP
>   	    | PMBUS_HAVE_STATUS_IOUT | PMBUS_HAVE_STATUS_INPUT,
>   	.read_word_data = pli1209bc_read_word_data,
> +#if IS_ENABLED(CONFIG_SENSORS_PLI1209BC_REGULATOR)
> +	.num_regulators = 1,
> +	.reg_desc = &pli1209bc_reg_desc,
> +#endif
>   };
>   
>   static int pli1209bc_probe(struct i2c_client *client)

Re: [PATCH v1 4/4] pmbus (pli1209bc): Add regulator support

[sylv]

On Fri, 2022-02-11 at 11:44 -0800, Guenter Roeck wrote:
> On 2/11/22 09:17, Marcello Sylvester Bauer wrote:
> > Add regulator support for PLI1209BC Digital Supervisor.
> > 
> > Signed-off-by: Marcello Sylvester Bauer <sylv@sylv.io>
> > ---
> >   drivers/hwmon/pmbus/Kconfig     |  8 ++++++++
> >   drivers/hwmon/pmbus/pli1209bc.c | 33
> > +++++++++++++++++++++++++++++++++
> >   2 files changed, 41 insertions(+)
> > 
> > diff --git a/drivers/hwmon/pmbus/Kconfig
> > b/drivers/hwmon/pmbus/Kconfig
> > index 831db423bea0..e64e0f2d93c9 100644
> > --- a/drivers/hwmon/pmbus/Kconfig
> > +++ b/drivers/hwmon/pmbus/Kconfig
> > @@ -319,6 +319,14 @@ config SENSORS_PLI1209BC
> >           This driver can also be built as a module. If so, the
> > module will
> >           be called pli1209bc.
> >   
> > +config SENSORS_PLI1209BC_REGULATOR
> > +       bool "Regulator support for PLI1209BC"
> > +       depends on SENSORS_PLI1209BC && REGULATOR
> > +       help
> > +         If you say yes here you get regulator support for Vicor
> > PLI1209BC
> > +         Digital Supervisor.
> > +
> > +
> 
> Single empty line please

ack.

> 
> >   config SENSORS_PM6764TR
> >         tristate "ST PM6764TR"
> >         help
> > diff --git a/drivers/hwmon/pmbus/pli1209bc.c
> > b/drivers/hwmon/pmbus/pli1209bc.c
> > index da345eb105fd..ec479b22aa10 100644
> > --- a/drivers/hwmon/pmbus/pli1209bc.c
> > +++ b/drivers/hwmon/pmbus/pli1209bc.c
> > @@ -8,6 +8,7 @@
> >   #include <linux/i2c.h>
> >   #include <linux/module.h>
> >   #include <linux/pmbus.h>
> > +#include <linux/regulator/driver.h>
> >   #include "pmbus.h"
> >   
> >   /*
> > @@ -32,11 +33,39 @@ static int pli1209bc_read_word_data(struct
> > i2c_client *client, int page,
> >                 if (data < 0)
> >                         return data;
> >                 return div_s64(data + 5LL, 10L);
> > +#if IS_ENABLED(CONFIG_SENSORS_PLI1209BC_REGULATOR)
> 
> I don't think this needs to be conditional.

Sure, this would cause a redundant status check, if regulator support
is disabled. But that's not a big overhead I guess.

> 
> > +       /*
> > +        * PMBUS_READ_VOUT and PMBUS_READ_TEMPERATURE_1 returns
> > invalid data,
> 
> s/returns/return/ and no ','

ack.

Thanks,
Marcello

> 
> > +        * when the BCM is turned off. Since it is not possible to
> > return
> > +        * ENODATA error, return zero instead.
> > +        */
> > +       case PMBUS_READ_VOUT:
> > +       case PMBUS_READ_TEMPERATURE_1:
> > +               data = pmbus_read_word_data(client, page, phase,
> > +                                           PMBUS_STATUS_WORD);
> > +               if (data < 0)
> > +                       return data;
> > +               if (data & PB_STATUS_POWER_GOOD_N)
> > +                       return 0L;
> > +               return pmbus_read_word_data(client, page, phase,
> > reg);
> > +#endif
> >         default:
> >                 return -ENODATA;
> >         }
> >   }
> >   
> > +#if IS_ENABLED(CONFIG_SENSORS_PLI1209BC_REGULATOR)
> > +static const struct regulator_desc pli1209bc_reg_desc = {
> > +       .name = "vout2",
> > +       .id = 1,
> > +       .of_match = of_match_ptr("vout2"),
> > +       .regulators_node = of_match_ptr("regulators"),
> > +       .ops = &pmbus_regulator_ops,
> > +       .type = REGULATOR_VOLTAGE,
> > +       .owner = THIS_MODULE,
> > +};
> > +#endif
> > +
> >   static struct pmbus_driver_info pli1209bc_info = {
> >         .pages = 2,
> >         .format[PSC_VOLTAGE_IN] = direct,
> > @@ -64,6 +93,10 @@ static struct pmbus_driver_info pli1209bc_info =
> > {
> >             | PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP
> >             | PMBUS_HAVE_STATUS_IOUT | PMBUS_HAVE_STATUS_INPUT,
> >         .read_word_data = pli1209bc_read_word_data,
> > +#if IS_ENABLED(CONFIG_SENSORS_PLI1209BC_REGULATOR)
> > +       .num_regulators = 1,
> > +       .reg_desc = &pli1209bc_reg_desc,
> > +#endif
> >   };
> >   
> >   static int pli1209bc_probe(struct i2c_client *client)
>