[PATCH v2 0/2] Add support for MAX20830 PMBUS

[PATCH v2 0/2] Add support for MAX20830 PMBUS

[Alexis Czezar Torreno]

This series adds support for the Analog Devices MAX20830 step-down
switching regulator with PMBus interface.

The MAX20830 provides 2.7V to 16V input, 0.4V to 5.8V output, and up
to 30A output current. It supports monitoring of input/output voltage,
output current, and temperature via PMBus.

Datasheet: https://www.analog.com/en/products/max20830.html

Signed-off-by: Alexis Czezar Torreno <alexisczezar.torreno@analog.com>
---
Changes in v2:
- bindings:
  - did not add interrupt, smbalert pin does not exist in device.
  - added allof with ref to regulator.yaml
  - changed additionalprop to unevaluatedprop
  - device node name in example changed to regulator
- driver: 
  - max20830.rst: Added missing in2_alarm
  - max20830.c: 
    - added missing quotes in MODULE_IMPORT_NS
    - added comment on why i2c_smbus_read_i2c_block_data is used
    - first byte of buffer used as length instead of the return value
    - "unsupported device" log now does not print first byte of buffer
- Link to v1: https://lore.kernel.org/r/20260414-dev_max20830-v1-0-210d3f82c571@analog.com

---
Alexis Czezar Torreno (2):
      dt-bindings: hwmon: pmbus: add max20830
      hwmon: (pmbus/max20830) add driver for max20830

 .../bindings/hwmon/pmbus/adi,max20830.yaml         | 61 +++++++++++++++
 Documentation/hwmon/index.rst                      |  1 +
 Documentation/hwmon/max20830.rst                   | 49 ++++++++++++
 MAINTAINERS                                        |  9 +++
 drivers/hwmon/pmbus/Kconfig                        |  9 +++
 drivers/hwmon/pmbus/Makefile                       |  1 +
 drivers/hwmon/pmbus/max20830.c                     | 86 ++++++++++++++++++++++
 7 files changed, 216 insertions(+)
---
base-commit: fb447217c59a13b2fff22d94de2498c185cd9032
change-id: 20260414-dev_max20830-9460b92cf6aa

Best regards,
-- 
Alexis Czezar Torreno <alexisczezar.torreno@analog.com>

[PATCH v2 1/2] dt-bindings: hwmon: pmbus: add max20830

[Alexis Czezar Torreno]

Add device tree documentation for MAX20830 step-down DC-DC switching
regulator with PMBus interface.

Signed-off-by: Alexis Czezar Torreno <alexisczezar.torreno@analog.com>
---
 .../bindings/hwmon/pmbus/adi,max20830.yaml         | 61 ++++++++++++++++++++++
 MAINTAINERS                                        |  7 +++
 2 files changed, 68 insertions(+)

diff --git a/Documentation/devicetree/bindings/hwmon/pmbus/adi,max20830.yaml b/Documentation/devicetree/bindings/hwmon/pmbus/adi,max20830.yaml
new file mode 100644
index 0000000000000000000000000000000000000000..8b3ec1ffa0c9460de2122f6606ce3dcbcdfbbcc7
--- /dev/null
+++ b/Documentation/devicetree/bindings/hwmon/pmbus/adi,max20830.yaml
@@ -0,0 +1,61 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/hwmon/pmbus/adi,max20830.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Analog Devices MAX20830 Step-Down Switching Regulator with PMBus
+
+maintainers:
+  - Alexis Czezar Torreno <alexisczezar.torreno@analog.com>
+
+description: |
+  The MAX20830 is a fully integrated step-down DC-DC switching regulator with
+  PMBus interface. It provides 2.7V to 16V input, 0.4V to 5.8V adjustable
+  output, and up to 30A output current. It allows monitoring of input/output
+  voltage, output current and temperature through the PMBus serial interface.
+  Datasheet:
+    https://www.analog.com/en/products/max20830.html
+
+allOf:
+  - $ref: /schemas/regulator/regulator.yaml#
+
+properties:
+  compatible:
+    const: adi,max20830
+
+  reg:
+    maxItems: 1
+
+  vddh-supply:
+    description:
+      Phandle to the regulator that provides the VDDH power supply.
+
+  avdd-supply:
+    description:
+      Phandle to the regulator that provides the AVDD power supply.
+
+  ldoin-supply:
+    description:
+      Optional 2.5V to 5.5V LDO input supply.
+
+required:
+  - compatible
+  - reg
+  - vddh-supply
+
+unevaluatedProperties: false
+
+examples:
+  - |
+    i2c {
+        #address-cells = <1>;
+        #size-cells = <0>;
+
+        regulator@30 {
+            compatible = "adi,max20830";
+            reg = <0x30>;
+            vddh-supply = <&vddh>;
+        };
+    };
+...
diff --git a/MAINTAINERS b/MAINTAINERS
index 0a3991c10ade20dd79cc7d1bf2a1d307ba6bd19d..031c743e979521a92ed9ac67915c178ce31727bd 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -15579,6 +15579,13 @@ F:	Documentation/devicetree/bindings/hwmon/pmbus/adi,max17616.yaml
 F:	Documentation/hwmon/max17616.rst
 F:	drivers/hwmon/pmbus/max17616.c
 
+MAX20830 HARDWARE MONITOR DRIVER
+M:	Alexis Czezar Torreno <alexisczezar.torreno@analog.com>
+L:	linux-hwmon@vger.kernel.org
+S:	Supported
+W:	https://ez.analog.com/linux-software-drivers
+F:	Documentation/devicetree/bindings/hwmon/pmbus/adi,max20830.yaml
+
 MAX2175 SDR TUNER DRIVER
 M:	Ramesh Shanmugasundaram <rashanmu@gmail.com>
 L:	linux-media@vger.kernel.org

-- 
2.34.1

Re: [PATCH v2 1/2] dt-bindings: hwmon: pmbus: add max20830

[Conor Dooley]

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On Thu, Apr 16, 2026 at 03:59:10PM +0800, Alexis Czezar Torreno wrote:
> Add device tree documentation for MAX20830 step-down DC-DC switching
> regulator with PMBus interface.
> 
> Signed-off-by: Alexis Czezar Torreno <alexisczezar.torreno@analog.com>
> ---
>  .../bindings/hwmon/pmbus/adi,max20830.yaml         | 61 ++++++++++++++++++++++
>  MAINTAINERS                                        |  7 +++
>  2 files changed, 68 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/hwmon/pmbus/adi,max20830.yaml b/Documentation/devicetree/bindings/hwmon/pmbus/adi,max20830.yaml
> new file mode 100644
> index 0000000000000000000000000000000000000000..8b3ec1ffa0c9460de2122f6606ce3dcbcdfbbcc7
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/hwmon/pmbus/adi,max20830.yaml
> @@ -0,0 +1,61 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/hwmon/pmbus/adi,max20830.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Analog Devices MAX20830 Step-Down Switching Regulator with PMBus
> +
> +maintainers:
> +  - Alexis Czezar Torreno <alexisczezar.torreno@analog.com>
> +
> +description: |
> +  The MAX20830 is a fully integrated step-down DC-DC switching regulator with
> +  PMBus interface. It provides 2.7V to 16V input, 0.4V to 5.8V adjustable
> +  output, and up to 30A output current. It allows monitoring of input/output
> +  voltage, output current and temperature through the PMBus serial interface.
> +  Datasheet:
> +    https://www.analog.com/en/products/max20830.html
> +
> +allOf:
> +  - $ref: /schemas/regulator/regulator.yaml#
> +
> +properties:
> +  compatible:
> +    const: adi,max20830
> +
> +  reg:
> +    maxItems: 1

On the previous version, you got an LLM comment about not having the
interrupts property amongst other things.
I think the other things got implemented, but I didn't see any reply to
the bot about that?
I think the answer is that it shouldn't because the pin it referenced
doesn't exist, but when looking at the schematic I have to wonder if
there should be an interrupts property for dealing with "pgood"?

Cheers,
Conor.

> +
> +  vddh-supply:
> +    description:
> +      Phandle to the regulator that provides the VDDH power supply.
> +
> +  avdd-supply:
> +    description:
> +      Phandle to the regulator that provides the AVDD power supply.
> +
> +  ldoin-supply:
> +    description:
> +      Optional 2.5V to 5.5V LDO input supply.
> +
> +required:
> +  - compatible
> +  - reg
> +  - vddh-supply
> +
> +unevaluatedProperties: false
> +
> +examples:
> +  - |
> +    i2c {
> +        #address-cells = <1>;
> +        #size-cells = <0>;
> +
> +        regulator@30 {
> +            compatible = "adi,max20830";
> +            reg = <0x30>;
> +            vddh-supply = <&vddh>;
> +        };
> +    };
> +...
> diff --git a/MAINTAINERS b/MAINTAINERS
> index 0a3991c10ade20dd79cc7d1bf2a1d307ba6bd19d..031c743e979521a92ed9ac67915c178ce31727bd 100644
> --- a/MAINTAINERS
> +++ b/MAINTAINERS
> @@ -15579,6 +15579,13 @@ F:	Documentation/devicetree/bindings/hwmon/pmbus/adi,max17616.yaml
>  F:	Documentation/hwmon/max17616.rst
>  F:	drivers/hwmon/pmbus/max17616.c
>  
> +MAX20830 HARDWARE MONITOR DRIVER
> +M:	Alexis Czezar Torreno <alexisczezar.torreno@analog.com>
> +L:	linux-hwmon@vger.kernel.org
> +S:	Supported
> +W:	https://ez.analog.com/linux-software-drivers
> +F:	Documentation/devicetree/bindings/hwmon/pmbus/adi,max20830.yaml
> +
>  MAX2175 SDR TUNER DRIVER
>  M:	Ramesh Shanmugasundaram <rashanmu@gmail.com>
>  L:	linux-media@vger.kernel.org
> 
> -- 
> 2.34.1
> 

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Re: [PATCH v2 1/2] dt-bindings: hwmon: pmbus: add max20830

[Guenter Roeck]

On Thu, Apr 16, 2026 at 04:51:37PM +0100, Conor Dooley wrote:
> On Thu, Apr 16, 2026 at 03:59:10PM +0800, Alexis Czezar Torreno wrote:
> > Add device tree documentation for MAX20830 step-down DC-DC switching
> > regulator with PMBus interface.
> > 
> > Signed-off-by: Alexis Czezar Torreno <alexisczezar.torreno@analog.com>
> > ---
> >  .../bindings/hwmon/pmbus/adi,max20830.yaml         | 61 ++++++++++++++++++++++
> >  MAINTAINERS                                        |  7 +++
> >  2 files changed, 68 insertions(+)
> > 
> > diff --git a/Documentation/devicetree/bindings/hwmon/pmbus/adi,max20830.yaml b/Documentation/devicetree/bindings/hwmon/pmbus/adi,max20830.yaml
> > new file mode 100644
> > index 0000000000000000000000000000000000000000..8b3ec1ffa0c9460de2122f6606ce3dcbcdfbbcc7
> > --- /dev/null
> > +++ b/Documentation/devicetree/bindings/hwmon/pmbus/adi,max20830.yaml
> > @@ -0,0 +1,61 @@
> > +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> > +%YAML 1.2
> > +---
> > +$id: http://devicetree.org/schemas/hwmon/pmbus/adi,max20830.yaml#
> > +$schema: http://devicetree.org/meta-schemas/core.yaml#
> > +
> > +title: Analog Devices MAX20830 Step-Down Switching Regulator with PMBus
> > +
> > +maintainers:
> > +  - Alexis Czezar Torreno <alexisczezar.torreno@analog.com>
> > +
> > +description: |
> > +  The MAX20830 is a fully integrated step-down DC-DC switching regulator with
> > +  PMBus interface. It provides 2.7V to 16V input, 0.4V to 5.8V adjustable
> > +  output, and up to 30A output current. It allows monitoring of input/output
> > +  voltage, output current and temperature through the PMBus serial interface.
> > +  Datasheet:
> > +    https://www.analog.com/en/products/max20830.html
> > +
> > +allOf:
> > +  - $ref: /schemas/regulator/regulator.yaml#
> > +
> > +properties:
> > +  compatible:
> > +    const: adi,max20830
> > +
> > +  reg:
> > +    maxItems: 1
> 
> On the previous version, you got an LLM comment about not having the
> interrupts property amongst other things.
> I think the other things got implemented, but I didn't see any reply to
> the bot about that?
> I think the answer is that it shouldn't because the pin it referenced
> doesn't exist, but when looking at the schematic I have to wonder if

I had to look this up in the datasheet. A SMBus chip with no alert pin is
a bit odd, but you are correct.

> there should be an interrupts property for dealing with "pgood"?
> 
FWIW, I have never seen that. Normally such pins are used to take devices
out of reset.

Thanks,
Guenter

Re: [PATCH v2 1/2] dt-bindings: hwmon: pmbus: add max20830

[Conor Dooley]

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On Thu, Apr 16, 2026 at 11:01:49AM -0700, Guenter Roeck wrote:
> On Thu, Apr 16, 2026 at 04:51:37PM +0100, Conor Dooley wrote:
> > On Thu, Apr 16, 2026 at 03:59:10PM +0800, Alexis Czezar Torreno wrote:
> > > Add device tree documentation for MAX20830 step-down DC-DC switching
> > > regulator with PMBus interface.
> > > 
> > > Signed-off-by: Alexis Czezar Torreno <alexisczezar.torreno@analog.com>
> > > ---
> > >  .../bindings/hwmon/pmbus/adi,max20830.yaml         | 61 ++++++++++++++++++++++
> > >  MAINTAINERS                                        |  7 +++
> > >  2 files changed, 68 insertions(+)
> > > 
> > > diff --git a/Documentation/devicetree/bindings/hwmon/pmbus/adi,max20830.yaml b/Documentation/devicetree/bindings/hwmon/pmbus/adi,max20830.yaml
> > > new file mode 100644
> > > index 0000000000000000000000000000000000000000..8b3ec1ffa0c9460de2122f6606ce3dcbcdfbbcc7
> > > --- /dev/null
> > > +++ b/Documentation/devicetree/bindings/hwmon/pmbus/adi,max20830.yaml
> > > @@ -0,0 +1,61 @@
> > > +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> > > +%YAML 1.2
> > > +---
> > > +$id: http://devicetree.org/schemas/hwmon/pmbus/adi,max20830.yaml#
> > > +$schema: http://devicetree.org/meta-schemas/core.yaml#
> > > +
> > > +title: Analog Devices MAX20830 Step-Down Switching Regulator with PMBus
> > > +
> > > +maintainers:
> > > +  - Alexis Czezar Torreno <alexisczezar.torreno@analog.com>
> > > +
> > > +description: |
> > > +  The MAX20830 is a fully integrated step-down DC-DC switching regulator with
> > > +  PMBus interface. It provides 2.7V to 16V input, 0.4V to 5.8V adjustable
> > > +  output, and up to 30A output current. It allows monitoring of input/output
> > > +  voltage, output current and temperature through the PMBus serial interface.
> > > +  Datasheet:
> > > +    https://www.analog.com/en/products/max20830.html
> > > +
> > > +allOf:
> > > +  - $ref: /schemas/regulator/regulator.yaml#
> > > +
> > > +properties:
> > > +  compatible:
> > > +    const: adi,max20830
> > > +
> > > +  reg:
> > > +    maxItems: 1
> > 
> > On the previous version, you got an LLM comment about not having the
> > interrupts property amongst other things.
> > I think the other things got implemented, but I didn't see any reply to
> > the bot about that?
> > I think the answer is that it shouldn't because the pin it referenced
> > doesn't exist, but when looking at the schematic I have to wonder if
> 
> I had to look this up in the datasheet. A SMBus chip with no alert pin is
> a bit odd, but you are correct.
> 
> > there should be an interrupts property for dealing with "pgood"?
> > 
> FWIW, I have never seen that. Normally such pins are used to take devices
> out of reset.

It's an output on this device seemingly. I don't care if the driver
ignores it, but for completeness (and we like completeness with
bindings) I think it should be documented as an interrupt or gpio.

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RE: [PATCH v2 1/2] dt-bindings: hwmon: pmbus: add max20830

[Torreno, Alexis Czezar]

> > >
> > > On the previous version, you got an LLM comment about not having the
> > > interrupts property amongst other things.
> > > I think the other things got implemented, but I didn't see any reply
> > > to the bot about that?

I wasn't sure if it was that type of bot. I'll try replying on the other patch review.
I just added a note in the cover letter change log about the lacking smbalert. 

> > > I think the answer is that it shouldn't because the pin it
> > > referenced doesn't exist, but when looking at the schematic I have
> > > to wonder if
> >
> > I had to look this up in the datasheet. A SMBus chip with no alert pin
> > is a bit odd, but you are correct.
> >
> > > there should be an interrupts property for dealing with "pgood"?
> > >
> > FWIW, I have never seen that. Normally such pins are used to take
> > devices out of reset.
> 
> It's an output on this device seemingly. I don't care if the driver ignores it, but
> for completeness (and we like completeness with
> bindings) I think it should be documented as an interrupt or gpio.

Alright, I'll add it as an interrupt: optional power-good signal

Regards,
Alexis

Re: [PATCH v2 1/2] dt-bindings: hwmon: pmbus: add max20830

[Guenter Roeck]

On 4/16/26 18:04, Torreno, Alexis Czezar wrote:
> 
>>>>
>>>> On the previous version, you got an LLM comment about not having the
>>>> interrupts property amongst other things.
>>>> I think the other things got implemented, but I didn't see any reply
>>>> to the bot about that?
> 
> I wasn't sure if it was that type of bot. I'll try replying on the other patch review.
> I just added a note in the cover letter change log about the lacking smbalert.
> 
>>>> I think the answer is that it shouldn't because the pin it
>>>> referenced doesn't exist, but when looking at the schematic I have
>>>> to wonder if
>>>
>>> I had to look this up in the datasheet. A SMBus chip with no alert pin
>>> is a bit odd, but you are correct.
>>>
>>>> there should be an interrupts property for dealing with "pgood"?
>>>>
>>> FWIW, I have never seen that. Normally such pins are used to take
>>> devices out of reset.
>>
>> It's an output on this device seemingly. I don't care if the driver ignores it, but
>> for completeness (and we like completeness with
>> bindings) I think it should be documented as an interrupt or gpio.
> 
> Alright, I'll add it as an interrupt: optional power-good signal
> 

Uuh, that really doesn't make any sense. Please at least make it a gpio pin,
matching pwr-good-gpios of ti,tps65185.yaml.

Guenter

RE: [PATCH v2 1/2] dt-bindings: hwmon: pmbus: add max20830

[Torreno, Alexis Czezar]

> >>
> >> It's an output on this device seemingly. I don't care if the driver
> >> ignores it, but for completeness (and we like completeness with
> >> bindings) I think it should be documented as an interrupt or gpio.
> >
> > Alright, I'll add it as an interrupt: optional power-good signal
> >
> 
> Uuh, that really doesn't make any sense. Please at least make it a gpio pin,
> matching pwr-good-gpios of ti,tps65185.yaml.
> 

I see, will do.

[PATCH v2 2/2] hwmon: (pmbus/max20830) add driver for max20830

[Alexis Czezar Torreno]

Add support for MAX20830 step-down DC-DC switching regulator with
PMBus interface. It allows monitoring of input/output voltage,
output current and temperature through the PMBus serial interface.

Signed-off-by: Alexis Czezar Torreno <alexisczezar.torreno@analog.com>
---
 Documentation/hwmon/index.rst    |  1 +
 Documentation/hwmon/max20830.rst | 49 +++++++++++++++++++++++
 MAINTAINERS                      |  2 +
 drivers/hwmon/pmbus/Kconfig      |  9 +++++
 drivers/hwmon/pmbus/Makefile     |  1 +
 drivers/hwmon/pmbus/max20830.c   | 86 ++++++++++++++++++++++++++++++++++++++++
 6 files changed, 148 insertions(+)

diff --git a/Documentation/hwmon/index.rst b/Documentation/hwmon/index.rst
index 8b655e5d6b68b90c697a52c7bf526e81d370caf7..56f7eb761be76dd627a2f34135abad05203b0582 100644
--- a/Documentation/hwmon/index.rst
+++ b/Documentation/hwmon/index.rst
@@ -158,6 +158,7 @@ Hardware Monitoring Kernel Drivers
    max197
    max20730
    max20751
+   max20830
    max31722
    max31730
    max31760
diff --git a/Documentation/hwmon/max20830.rst b/Documentation/hwmon/max20830.rst
new file mode 100644
index 0000000000000000000000000000000000000000..936e409dcc5c0898dde27d782308d4a7e1357e73
--- /dev/null
+++ b/Documentation/hwmon/max20830.rst
@@ -0,0 +1,49 @@
+.. SPDX-License-Identifier: GPL-2.0
+
+Kernel driver max20830
+======================
+
+Supported chips:
+
+  * Analog Devices MAX20830
+
+    Prefix: 'max20830'
+
+    Addresses scanned: -
+
+    Datasheet: https://www.analog.com/media/en/technical-documentation/data-sheets/max20830.pdf
+
+Author:
+
+  - Alexis Czezar Torreno <alexisczezar.torreno@analog.com>
+
+
+Description
+-----------
+
+This driver supports hardware monitoring for Analog Devices MAX20830
+Step-Down Switching Regulator with PMBus Interface.
+
+The MAX20830 is a 2.7V to 16V, 30A fully integrated step-down DC-DC switching
+regulator. Through the PMBus interface, the device can monitor input/output
+voltages, output current and temperature.
+
+The driver is a client driver to the core PMBus driver. Please see
+Documentation/hwmon/pmbus.rst for details on PMBus client drivers.
+
+Sysfs entries
+-------------
+
+================= ========================================
+in1_label         "vin"
+in1_input         Measured input voltage
+in1_alarm         Input voltage alarm
+in2_label         "vout1"
+in2_input         Measured output voltage
+in2_alarm         Output voltage alarm
+curr1_label       "iout1"
+curr1_input       Measured output current
+curr1_alarm       Output current alarm
+temp1_input       Measured temperature
+temp1_alarm       Chip temperature alarm
+================= ========================================
diff --git a/MAINTAINERS b/MAINTAINERS
index 031c743e979521a92ed9ac67915c178ce31727bd..d6a6745e2dae29c3b8f80bbe61c54a2f5ecd9f47 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -15585,6 +15585,8 @@ L:	linux-hwmon@vger.kernel.org
 S:	Supported
 W:	https://ez.analog.com/linux-software-drivers
 F:	Documentation/devicetree/bindings/hwmon/pmbus/adi,max20830.yaml
+F:	Documentation/hwmon/max20830.rst
+F:	drivers/hwmon/pmbus/max20830.c
 
 MAX2175 SDR TUNER DRIVER
 M:	Ramesh Shanmugasundaram <rashanmu@gmail.com>
diff --git a/drivers/hwmon/pmbus/Kconfig b/drivers/hwmon/pmbus/Kconfig
index 8f4bff375ecbc355f5ed3400855c2852ec2aa5ef..987705bf45b75b7b91ccc469247909f3c3f53d77 100644
--- a/drivers/hwmon/pmbus/Kconfig
+++ b/drivers/hwmon/pmbus/Kconfig
@@ -365,6 +365,15 @@ config SENSORS_MAX20751
 	  This driver can also be built as a module. If so, the module will
 	  be called max20751.
 
+config SENSORS_MAX20830
+	tristate "Analog Devices MAX20830"
+	help
+	  If you say yes here you get hardware monitoring support for Analog
+	  Devices MAX20830.
+
+	  This driver can also be built as a module. If so, the module will
+	  be called max20830.
+
 config SENSORS_MAX31785
 	tristate "Maxim MAX31785 and compatibles"
 	help
diff --git a/drivers/hwmon/pmbus/Makefile b/drivers/hwmon/pmbus/Makefile
index 7129b62bc00f8a2e98de14004997752a856dfda2..bc52f930e0825a902a0dd1c9e2b44f2e8d577c35 100644
--- a/drivers/hwmon/pmbus/Makefile
+++ b/drivers/hwmon/pmbus/Makefile
@@ -36,6 +36,7 @@ obj-$(CONFIG_SENSORS_MAX16601)	+= max16601.o
 obj-$(CONFIG_SENSORS_MAX17616)	+= max17616.o
 obj-$(CONFIG_SENSORS_MAX20730)	+= max20730.o
 obj-$(CONFIG_SENSORS_MAX20751)	+= max20751.o
+obj-$(CONFIG_SENSORS_MAX20830)	+= max20830.o
 obj-$(CONFIG_SENSORS_MAX31785)	+= max31785.o
 obj-$(CONFIG_SENSORS_MAX34440)	+= max34440.o
 obj-$(CONFIG_SENSORS_MAX8688)	+= max8688.o
diff --git a/drivers/hwmon/pmbus/max20830.c b/drivers/hwmon/pmbus/max20830.c
new file mode 100644
index 0000000000000000000000000000000000000000..21ea8b59150cb0564f1776ee08131bad7fdef003
--- /dev/null
+++ b/drivers/hwmon/pmbus/max20830.c
@@ -0,0 +1,86 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Hardware monitoring driver for Analog Devices MAX20830
+ *
+ * Copyright (C) 2026 Analog Devices, Inc.
+ */
+
+#include <linux/i2c.h>
+#include <linux/mod_devicetable.h>
+#include <linux/module.h>
+#include "pmbus.h"
+
+static struct pmbus_driver_info max20830_info = {
+	.pages = 1,
+	.format[PSC_VOLTAGE_IN] = linear,
+	.format[PSC_VOLTAGE_OUT] = linear,
+	.format[PSC_CURRENT_OUT] = linear,
+	.format[PSC_TEMPERATURE] = linear,
+	.func[0] = PMBUS_HAVE_VIN | PMBUS_HAVE_VOUT | PMBUS_HAVE_IOUT |
+		PMBUS_HAVE_TEMP |
+		PMBUS_HAVE_STATUS_VOUT | PMBUS_HAVE_STATUS_IOUT |
+		PMBUS_HAVE_STATUS_INPUT | PMBUS_HAVE_STATUS_TEMP,
+};
+
+static int max20830_probe(struct i2c_client *client)
+{
+	u8 buf[I2C_SMBUS_BLOCK_MAX + 1];
+	u8 len;
+	int ret;
+
+	if (!i2c_check_functionality(client->adapter,
+				     I2C_FUNC_SMBUS_READ_I2C_BLOCK))
+		return -ENODEV;
+
+	/*
+	 * Use i2c_smbus_read_i2c_block_data() instead of
+	 * i2c_smbus_read_block_data() to support I2C controllers
+	 * which do not support SMBus block reads.
+	 */
+	ret = i2c_smbus_read_i2c_block_data(client, PMBUS_IC_DEVICE_ID,
+					    I2C_SMBUS_BLOCK_MAX, buf);
+	if (ret < 0)
+		return dev_err_probe(&client->dev, ret,
+				     "Failed to read IC_DEVICE_ID\n");
+
+	/* First byte is the block length. */
+	len = buf[0];
+	if (len != 9)
+		return dev_err_probe(&client->dev, -ENODEV,
+				     "Unexpected IC_DEVICE_ID response\n");
+
+	buf[len] = '\0';
+	if (strncmp(buf + 1, "MAX20830", 8))
+		return dev_err_probe(&client->dev, -ENODEV,
+				     "Unsupported device: '%s'\n", buf + 1);
+
+	return pmbus_do_probe(client, &max20830_info);
+}
+
+static const struct i2c_device_id max20830_id[] = {
+	{"max20830"},
+	{ }
+};
+MODULE_DEVICE_TABLE(i2c, max20830_id);
+
+static const struct of_device_id max20830_of_match[] = {
+	{ .compatible = "adi,max20830" },
+	{ }
+};
+MODULE_DEVICE_TABLE(of, max20830_of_match);
+
+static struct i2c_driver max20830_driver = {
+	.driver = {
+		.name = "max20830",
+		.of_match_table = max20830_of_match,
+	},
+	.probe = max20830_probe,
+	.id_table = max20830_id,
+};
+
+module_i2c_driver(max20830_driver);
+
+MODULE_AUTHOR("Alexis Czezar Torreno <alexisczezar.torreno@analog.com>");
+MODULE_DESCRIPTION("PMBus driver for Analog Devices MAX20830");
+MODULE_LICENSE("GPL");
+MODULE_IMPORT_NS("PMBUS");

-- 
2.34.1

Re: [PATCH v2 2/2] hwmon: (pmbus/max20830) add driver for max20830

[Nuno Sá]

On Thu, Apr 16, 2026 at 03:59:11PM +0800, Alexis Czezar Torreno wrote:
> Add support for MAX20830 step-down DC-DC switching regulator with
> PMBus interface. It allows monitoring of input/output voltage,
> output current and temperature through the PMBus serial interface.
> 
> Signed-off-by: Alexis Czezar Torreno <alexisczezar.torreno@analog.com>
> ---
>  Documentation/hwmon/index.rst    |  1 +
>  Documentation/hwmon/max20830.rst | 49 +++++++++++++++++++++++
>  MAINTAINERS                      |  2 +
>  drivers/hwmon/pmbus/Kconfig      |  9 +++++
>  drivers/hwmon/pmbus/Makefile     |  1 +
>  drivers/hwmon/pmbus/max20830.c   | 86 ++++++++++++++++++++++++++++++++++++++++
>  6 files changed, 148 insertions(+)
> 
> diff --git a/Documentation/hwmon/index.rst b/Documentation/hwmon/index.rst
> index 8b655e5d6b68b90c697a52c7bf526e81d370caf7..56f7eb761be76dd627a2f34135abad05203b0582 100644
> --- a/Documentation/hwmon/index.rst
> +++ b/Documentation/hwmon/index.rst
> @@ -158,6 +158,7 @@ Hardware Monitoring Kernel Drivers
>     max197
>     max20730
>     max20751
> +   max20830
>     max31722
>     max31730
>     max31760
> diff --git a/Documentation/hwmon/max20830.rst b/Documentation/hwmon/max20830.rst
> new file mode 100644
> index 0000000000000000000000000000000000000000..936e409dcc5c0898dde27d782308d4a7e1357e73
> --- /dev/null
> +++ b/Documentation/hwmon/max20830.rst
> @@ -0,0 +1,49 @@
> +.. SPDX-License-Identifier: GPL-2.0
> +
> +Kernel driver max20830
> +======================
> +
> +Supported chips:
> +
> +  * Analog Devices MAX20830
> +
> +    Prefix: 'max20830'
> +
> +    Addresses scanned: -
> +
> +    Datasheet: https://www.analog.com/media/en/technical-documentation/data-sheets/max20830.pdf
> +
> +Author:
> +
> +  - Alexis Czezar Torreno <alexisczezar.torreno@analog.com>
> +
> +
> +Description
> +-----------
> +
> +This driver supports hardware monitoring for Analog Devices MAX20830
> +Step-Down Switching Regulator with PMBus Interface.
> +
> +The MAX20830 is a 2.7V to 16V, 30A fully integrated step-down DC-DC switching
> +regulator. Through the PMBus interface, the device can monitor input/output
> +voltages, output current and temperature.
> +
> +The driver is a client driver to the core PMBus driver. Please see
> +Documentation/hwmon/pmbus.rst for details on PMBus client drivers.
> +
> +Sysfs entries
> +-------------
> +
> +================= ========================================
> +in1_label         "vin"
> +in1_input         Measured input voltage
> +in1_alarm         Input voltage alarm
> +in2_label         "vout1"
> +in2_input         Measured output voltage
> +in2_alarm         Output voltage alarm
> +curr1_label       "iout1"
> +curr1_input       Measured output current
> +curr1_alarm       Output current alarm
> +temp1_input       Measured temperature
> +temp1_alarm       Chip temperature alarm
> +================= ========================================
> diff --git a/MAINTAINERS b/MAINTAINERS
> index 031c743e979521a92ed9ac67915c178ce31727bd..d6a6745e2dae29c3b8f80bbe61c54a2f5ecd9f47 100644
> --- a/MAINTAINERS
> +++ b/MAINTAINERS
> @@ -15585,6 +15585,8 @@ L:	linux-hwmon@vger.kernel.org
>  S:	Supported
>  W:	https://ez.analog.com/linux-software-drivers
>  F:	Documentation/devicetree/bindings/hwmon/pmbus/adi,max20830.yaml
> +F:	Documentation/hwmon/max20830.rst
> +F:	drivers/hwmon/pmbus/max20830.c
>  
>  MAX2175 SDR TUNER DRIVER
>  M:	Ramesh Shanmugasundaram <rashanmu@gmail.com>
> diff --git a/drivers/hwmon/pmbus/Kconfig b/drivers/hwmon/pmbus/Kconfig
> index 8f4bff375ecbc355f5ed3400855c2852ec2aa5ef..987705bf45b75b7b91ccc469247909f3c3f53d77 100644
> --- a/drivers/hwmon/pmbus/Kconfig
> +++ b/drivers/hwmon/pmbus/Kconfig
> @@ -365,6 +365,15 @@ config SENSORS_MAX20751
>  	  This driver can also be built as a module. If so, the module will
>  	  be called max20751.
>  
> +config SENSORS_MAX20830
> +	tristate "Analog Devices MAX20830"
> +	help
> +	  If you say yes here you get hardware monitoring support for Analog
> +	  Devices MAX20830.
> +
> +	  This driver can also be built as a module. If so, the module will
> +	  be called max20830.
> +
>  config SENSORS_MAX31785
>  	tristate "Maxim MAX31785 and compatibles"
>  	help
> diff --git a/drivers/hwmon/pmbus/Makefile b/drivers/hwmon/pmbus/Makefile
> index 7129b62bc00f8a2e98de14004997752a856dfda2..bc52f930e0825a902a0dd1c9e2b44f2e8d577c35 100644
> --- a/drivers/hwmon/pmbus/Makefile
> +++ b/drivers/hwmon/pmbus/Makefile
> @@ -36,6 +36,7 @@ obj-$(CONFIG_SENSORS_MAX16601)	+= max16601.o
>  obj-$(CONFIG_SENSORS_MAX17616)	+= max17616.o
>  obj-$(CONFIG_SENSORS_MAX20730)	+= max20730.o
>  obj-$(CONFIG_SENSORS_MAX20751)	+= max20751.o
> +obj-$(CONFIG_SENSORS_MAX20830)	+= max20830.o
>  obj-$(CONFIG_SENSORS_MAX31785)	+= max31785.o
>  obj-$(CONFIG_SENSORS_MAX34440)	+= max34440.o
>  obj-$(CONFIG_SENSORS_MAX8688)	+= max8688.o
> diff --git a/drivers/hwmon/pmbus/max20830.c b/drivers/hwmon/pmbus/max20830.c
> new file mode 100644
> index 0000000000000000000000000000000000000000..21ea8b59150cb0564f1776ee08131bad7fdef003
> --- /dev/null
> +++ b/drivers/hwmon/pmbus/max20830.c
> @@ -0,0 +1,86 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * Hardware monitoring driver for Analog Devices MAX20830
> + *
> + * Copyright (C) 2026 Analog Devices, Inc.
> + */
> +
> +#include <linux/i2c.h>
> +#include <linux/mod_devicetable.h>
> +#include <linux/module.h>
> +#include "pmbus.h"
> +
> +static struct pmbus_driver_info max20830_info = {
> +	.pages = 1,
> +	.format[PSC_VOLTAGE_IN] = linear,
> +	.format[PSC_VOLTAGE_OUT] = linear,
> +	.format[PSC_CURRENT_OUT] = linear,
> +	.format[PSC_TEMPERATURE] = linear,
> +	.func[0] = PMBUS_HAVE_VIN | PMBUS_HAVE_VOUT | PMBUS_HAVE_IOUT |
> +		PMBUS_HAVE_TEMP |
> +		PMBUS_HAVE_STATUS_VOUT | PMBUS_HAVE_STATUS_IOUT |
> +		PMBUS_HAVE_STATUS_INPUT | PMBUS_HAVE_STATUS_TEMP,
> +};
> +
> +static int max20830_probe(struct i2c_client *client)
> +{
> +	u8 buf[I2C_SMBUS_BLOCK_MAX + 1];

AI seems a bit paranoid but maybe to be on the safe side just initialize
the above buffer.

> +	u8 len;
> +	int ret;
> +
> +	if (!i2c_check_functionality(client->adapter,
> +				     I2C_FUNC_SMBUS_READ_I2C_BLOCK))
> +		return -ENODEV;
> +
> +	/*
> +	 * Use i2c_smbus_read_i2c_block_data() instead of
> +	 * i2c_smbus_read_block_data() to support I2C controllers
> +	 * which do not support SMBus block reads.
> +	 */
> +	ret = i2c_smbus_read_i2c_block_data(client, PMBUS_IC_DEVICE_ID,
> +					    I2C_SMBUS_BLOCK_MAX, buf);
> +	if (ret < 0)
> +		return dev_err_probe(&client->dev, ret,
> +				     "Failed to read IC_DEVICE_ID\n");
> +
> +	/* First byte is the block length. */
> +	len = buf[0];
> +	if (len != 9)
> +		return dev_err_probe(&client->dev, -ENODEV,
> +				     "Unexpected IC_DEVICE_ID response\n");
> +
> +	buf[len] = '\0';

It looks like it has a point in the above though.

- Nuno Sá