Re: [PATCH 1/3] dt-bindings: hwmon: Add maxim max31790 driver bindings

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On 11/03/2024 23:55, Krzysztof Kozlowski wrote:
On 11/03/2024 12:13, Chanh Nguyen wrote:
Add a device tree bindings for max31790 device.

Subject: drop "driver", bindings are about hardware.


Yes, I'll drop "driver" at v2 updating.

It does not look like you tested the bindings, at least after quick
look. Please run `make dt_binding_check` (see
Documentation/devicetree/bindings/writing-schema.rst for instructions).
Maybe you need to update your dtschema and yamllint.



I tested the binding, I didn't see any warning/error log. Please review my logs as below

=> make dt_binding_check DT_SCHEMA_FILES=/hwmon/max31790.yaml
make[1]: Entering directory '/DISK4T/work/community/linux/out'
  DTEX    Documentation/devicetree/bindings/hwmon/max31790.example.dts
  DTC_CHK Documentation/devicetree/bindings/hwmon/max31790.example.dtb
make[1]: Leaving directory '/DISK4T/work/community/linux/out'


Signed-off-by: Chanh Nguyen <chanh@xxxxxxxxxxxxxxxxxxxxxx>
---
  .../devicetree/bindings/hwmon/max31790.yaml   | 44 +++++++++++++++++++
  1 file changed, 44 insertions(+)
  create mode 100644 Documentation/devicetree/bindings/hwmon/max31790.yaml

diff --git a/Documentation/devicetree/bindings/hwmon/max31790.yaml b/Documentation/devicetree/bindings/hwmon/max31790.yaml
new file mode 100644
index 000000000000..5a93e6bdebda
--- /dev/null
+++ b/Documentation/devicetree/bindings/hwmon/max31790.yaml

Filename like compatible.

Yes, I'll update that in v2


@@ -0,0 +1,44 @@
+# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/hwmon/max31790.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: The Maxim MAX31790 Fan Controller
+
+maintainers:
+  - Jean Delvare <jdelvare@xxxxxxxx>
+  - Guenter Roeck <linux@xxxxxxxxxxxx>

You should have here someone responsible for hardware, not subsystem
maintainers.


Hi Krzysztof,
I checked the history of the drivers/hwmon/max31790.c and see Guenter Roeck <linux@xxxxxxxxxxxx> as an important maintainer. I saw many commits from him. So, I add him to maintainer list.

+
+description: >
+  The MAX31790 controls the speeds of up to six fans using six
+  independent PWM outputs. The desired fan speeds (or PWM duty cycles)
+  are written through the I2C interface.
+
+  Datasheets:
+    https://datasheets.maximintegrated.com/en/ds/MAX31790.pdf
+
+properties:
+  compatible:
+    const: maxim,max31790
+
+  reg:
+    maxItems: 1

That's weirdly empty.


Hi Krzysztof,
I have not yet understood your comment here. Please help give more details for my missing! Thank Krzysztof!
+
+required:
+  - compatible
+  - reg
+

You miss allOf: with $ref to fan controller schema.


Thank Krzysztof,
I'll add the allOf at v2.

+additionalProperties: false
+
+examples:
+  - |
+    i2c {
+      #address-cells = <1>;
+      #size-cells = <0>;
+
+      max31790@20 {

Node names should be generic. See also an explanation and list of
examples (not exhaustive) in DT specification:
https://devicetree-specification.readthedocs.io/en/latest/chapter2-devicetree-basics.html#generic-names-recommendation


I suggest some node names, such as "i2c-fan" or "fan-controller" . Can you please share your ideas with me!


Best regards,
Krzysztof





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