linux-kernel - Re: [PATCH] dt-bindings: power: supply: bq256xx: Add ts-ignore property

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Date:   Fri, 10 Mar 2023 09:06:48 +0100
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Hermes Zhang <chenhuiz@...s.com>,
        Sebastian Reichel <sre@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Andrew Davis <afd@...com>
Cc:     kernel@...s.com, linux-pm@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] dt-bindings: power: supply: bq256xx: Add ts-ignore
 property

On 10/03/2023 04:48, Hermes Zhang wrote:
> On 2023/3/9 18:12, Krzysztof Kozlowski wrote:
>> On 09/03/2023 03:39, Hermes Zhang wrote:
>>> Add a new property: ts-ignore to allow user to enable the TS_IGNORE flag
>>> in chip. Ignore TS pin will allow user to control the charging
>>> parameters instead of the default JEITA profile in chip.
>> You miss users of it.
> Could you give some more info about what I missed?

Users. DTS and driver code.

>> @@ -68,6 +68,12 @@ properties:
>>         Interrupt sends an active low, 256 μs pulse to host to report the charger
>>         device status and faults.
>>   
>> +  ts-ignore:
>> Missing vendor prefix... is this generic property? ts-ignore is very
>> cryptic. You should describe here rather desired system characteristic.
>> Why anyone would need to use it per-board level?
> 
> OK, I will fix it. Will "ti,ignore-ts-pin" be better? 

No, because does not describe system characteristic. Read again my last
two sentences.

> Yes, it's a 
> generic. To disable the TS pin, actually we also could do it from HW, 
> but from software, it could be more flexble. But if HW already disable 
> it, then you don't need to do it again from dts.

If this is configurable from HW, why this should be in DT?


Best regards,
Krzysztof