Re: [PATCH v7 7/9] dt-bindings: mfd: Add bindings for Ampere Altra SMPro MFD driver

Quan Nguyen
2022-03-25T07:14:09Z

On 21/03/2022 17:08, Krzysztof Kozlowski wrote:
> On 21/03/2022 09:13, Quan Nguyen wrote:
>> Adds device tree bindings for SMPro MFD driver found on the Mt.Jade
>> hardware reference platform with Ampere's Altra Processor family.
>>
>> The SMpro co-processor on Ampere Altra processor family is to monitor
>> and report various data included hwmon-related info, RAS errors, and
>> other miscellaneous information.
>>
>> Signed-off-by: Quan Nguyen <quan@os.amperecomputing.com>
>> Reviewed-by: Rob Herring <robh@kernel.org>
>> ---
>> Changes in v7:
>> + None
>>
>> Changes in v6:
>> + None
>>
>> .../devicetree/bindings/mfd/ampere,smpro.yaml | 48 +++++++++++++++++++
>> 1 file changed, 48 insertions(+)
>> create mode 100644 Documentation/devicetree/bindings/mfd/ampere,smpro.yaml
>>
>> diff --git a/Documentation/devicetree/bindings/mfd/ampere,smpro.yaml b/Documentation/devicetree/bindings/mfd/ampere,smpro.yaml
>> new file mode 100644
>> index 000000000000..c29d975c1bc3
>> --- /dev/null
>> +++ b/Documentation/devicetree/bindings/mfd/ampere,smpro.yaml
>> @@ -0,0 +1,48 @@
>> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
>> +%YAML 1.2
>> +---
>> +$id: http://devicetree.org/schemas/mfd/ampere,smpro.yaml#
>> +$schema: http://devicetree.org/meta-schemas/core.yaml#
>> +
>> +title: Ampere Altra SMPro firmware driver
>> +
>> +maintainers:
>> + - Quan Nguyen <quan@os.amperecomputing.com>
>> +
>> +description: |
>> + Ampere Altra SMPro firmware may contain different blocks like hardware
>> + monitoring, error monitoring and other miscellaneous features.
>> +
>> +properties:
>> + compatible:
>> + enum:
>> + - ampere,smpro
>> +
>> + reg:
>> + description:
>> + I2C device address.
>> + maxItems: 1
>> +
>> + "#address-cells":
>> + const: 1
>> +
>> + "#size-cells":
>> + const: 0
>
> Why do you need address/size cells? Is the binding not complete? The
> commit description does not mention such case.
>

Thanks Krzysztof for the comment.
The address/size cells are indeed not used. The child drivers are
instantiated by the parent MFD and there is no child nodes in DT. This
part will be removed in my next version.

- Quan