linux-kernel - Re: [PATCH v4 1/7] dt-bindings: hwmon: Add nuvoton,nct6775

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Message-ID: <YmjmWNUpCAFYesyk@hatter.bewilderbeest.net>
Date:   Tue, 26 Apr 2022 23:44:40 -0700
From:   Zev Weiss <zev@...ilderbeest.net>
To:     Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
Cc:     Guenter Roeck <linux@...ck-us.net>,
        Jean Delvare <jdelvare@...e.com>, linux-hwmon@...r.kernel.org,
        Rob Herring <robh+dt@...nel.org>, devicetree@...r.kernel.org,
        Renze Nicolai <renze@...lus.nl>,
        Oleksandr Natalenko <oleksandr@...alenko.name>,
        openbmc@...ts.ozlabs.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4 1/7] dt-bindings: hwmon: Add nuvoton,nct6775

On Tue, Apr 26, 2022 at 11:04:30PM PDT, Krzysztof Kozlowski wrote:
>On 27/04/2022 03:01, Zev Weiss wrote:
>> These Super I/O chips have an i2c interface that some systems expose
>> to a BMC; the BMC's device tree can now describe that via this
>> binding.
>>
>> Signed-off-by: Zev Weiss <zev@...ilderbeest.net>
>
>I already reviewed it so I guess you did not include the tag because of
>significant changes?
>

Yeah, the nuvoton,tsi-channel-mask property is new this round, so I 
dropped the previous R-B -- and since it looks like I missed some stuff, 
thanks for taking another look (though perhaps some of it could have 
been avoided if I'd remembered to run 'make dt_binding_check').

>> ---
>>  .../bindings/hwmon/nuvoton,nct6775.yaml       | 56 +++++++++++++++++++
>>  1 file changed, 56 insertions(+)
>>  create mode 100644 Documentation/devicetree/bindings/hwmon/nuvoton,nct6775.yaml
>>
>> diff --git a/Documentation/devicetree/bindings/hwmon/nuvoton,nct6775.yaml b/Documentation/devicetree/bindings/hwmon/nuvoton,nct6775.yaml
>> new file mode 100644
>> index 000000000000..418477374fdb
>> --- /dev/null
>> +++ b/Documentation/devicetree/bindings/hwmon/nuvoton,nct6775.yaml
>> @@ -0,0 +1,56 @@
>> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
>> +%YAML 1.2
>> +---
>> +
>> +$id: http://devicetree.org/schemas/hwmon/nuvoton,nct6775.yaml#
>> +$schema: http://devicetree.org/meta-schemas/core.yaml#
>> +
>> +title: Nuvoton NCT6775 and compatible Super I/O chips
>> +
>> +maintainers:
>> +  - Zev Weiss <zev@...ilderbeest.net>
>> +
>> +properties:
>> +  compatible:
>> +    enum:
>> +      - nuvoton,nct6106
>> +      - nuvoton,nct6116
>> +      - nuvoton,nct6775
>> +      - nuvoton,nct6776
>> +      - nuvoton,nct6779
>> +      - nuvoton,nct6791
>> +      - nuvoton,nct6792
>> +      - nuvoton,nct6793
>> +      - nuvoton,nct6795
>> +      - nuvoton,nct6796
>> +      - nuvoton,nct6797
>> +      - nuvoton,nct6798
>> +
>> +  reg:
>> +    maxItems: 1
>> +
>> +  nuvoton,tsi-channel-mask:
>> +    description:
>> +      Bitmask indicating which TSI temperature sensor channels are
>> +      active.  LSB is TSI0, bit 1 is TSI1, etc.
>
>Need a type/ref.
>

Ack, thanks.

>> +    maximum: 0xff
>> +    default: 0
>
>Since by default it is disabled, doesn't it make a required property?
>IOW, if you add a node without this mask, will the device operate
>properly and usefully?
>

Yeah, zero active TSI channels is a totally legitimate way for these 
devices to operate.  TSI is just an optional source of additional 
temperature readings that's used on some (AMD) systems; all the basic 
Super I/O functionality works fine without it.


Thanks,
Zev