linux-kernel - Re: [PATCH 1/2] dt-bindings: hwmon: ti,ina2xx: Add alert-polarity property

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Date: Fri, 31 May 2024 14:50:40 -0700
From: Guenter Roeck <linux@...ck-us.net>
To: Krzysztof Kozlowski <krzk@...nel.org>, Amna Waseem
 <Amna.Waseem@...s.com>, Jean Delvare <jdelvare@...e.com>,
 Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>,
 Conor Dooley <conor+dt@...nel.org>
Cc: linux-hwmon@...r.kernel.org, devicetree@...r.kernel.org,
 linux-kernel@...r.kernel.org, kernel@...s.com
Subject: Re: [PATCH 1/2] dt-bindings: hwmon: ti,ina2xx: Add alert-polarity
 property

On 5/31/24 00:41, Krzysztof Kozlowski wrote:
> On 29/05/2024 16:01, Guenter Roeck wrote:
>> On 5/29/24 00:07, Krzysztof Kozlowski wrote:
>>> On 29/05/2024 08:07, Amna Waseem wrote:
>>>> Add a property to the binding to configure the Alert Polarity.
>>>> Alert pin is asserted based on the value of Alert Polarity bit of
>>>> Mask/Enable register. It is by default 0 which means Alert pin is
>>>> configured to be active low. To configure it to active high, set
>>>> alert-polarity property value to 1.
>>>>
>>>> Signed-off-by: Amna Waseem <Amna.Waseem@...s.com>
>>>> ---
>>>>    Documentation/devicetree/bindings/hwmon/ti,ina2xx.yaml | 9 +++++++++
>>>>    1 file changed, 9 insertions(+)
>>>>
>>>> diff --git a/Documentation/devicetree/bindings/hwmon/ti,ina2xx.yaml b/Documentation/devicetree/bindings/hwmon/ti,ina2xx.yaml
>>>> index df86c2c92037..a3f0fd71fcc6 100644
>>>> --- a/Documentation/devicetree/bindings/hwmon/ti,ina2xx.yaml
>>>> +++ b/Documentation/devicetree/bindings/hwmon/ti,ina2xx.yaml
>>>> @@ -66,6 +66,14 @@ properties:
>>>>        description: phandle to the regulator that provides the VS supply typically
>>>>          in range from 2.7 V to 5.5 V.
>>>>    
>>>> +  alert-polarity:
>>>
>>> Missing vendor prefix.
>>>
>>
>> Are you sure you want a vendor prefix here ? Reason for asking is that
>> many hardware monitoring chips have configurable alert or interrupt polarity,
>> only the name is different. Some examples are the JC42.4 standard ("event
>> polarity"), adt7410/adt7420 "interrupt polarity", MAX31827 ("alarm polarity"),
>> or DS1621 ("output polarity"). We even have a vendor property, "adi,alarm-pol",
>> used for MAX31827.
> 
> Hm, I just checked if this is already existing property, but indeed I
> did not check other variants.
> 
> Indeed it could go to common properties - hwmon-common.yaml. But then
> how about using strings (as I asked before...).
> 

I can't really comment on the strings; that is out of my knowledge zone.
It might make sense to have hwmon-common.yaml, but I think that would
require a some (read: a lot of) work.

Guenter