linux-kernel - Re: [PATCH v5 2/5] dt-bindings: clock: Add AST2500/AST2600 HACE reset definition

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Date:   Wed, 29 Jun 2022 04:39:00 -0700
From:   Dhananjay Phadke <dphadke@...ux.microsoft.com>
To:     Neal Liu <neal_liu@...eedtech.com>,
        Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
        Corentin Labbe <clabbe.montjoie@...il.com>,
        Christophe JAILLET <christophe.jaillet@...adoo.fr>,
        Randy Dunlap <rdunlap@...radead.org>,
        Herbert Xu <herbert@...dor.apana.org.au>,
        "David S . Miller" <davem@...emloft.net>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Joel Stanley <joel@....id.au>,
        Andrew Jeffery <andrew@...id.au>,
        Johnny Huang <johnny_huang@...eedtech.com>
Cc:     "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "linux-aspeed@...ts.ozlabs.org" <linux-aspeed@...ts.ozlabs.org>,
        BMC-SW <BMC-SW@...eedtech.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-crypto@...r.kernel.org" <linux-crypto@...r.kernel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH v5 2/5] dt-bindings: clock: Add AST2500/AST2600 HACE reset
 definition

On 6/29/2022 1:49 AM, Neal Liu wrote:
[...]
>>>>> diff --git a/include/dt-bindings/clock/aspeed-clock.h
>>>>> b/include/dt-bindings/clock/aspeed-clock.h
>>>>> index 9ff4f6e4558c..6e040f7c3426 100644
>>>>> --- a/include/dt-bindings/clock/aspeed-clock.h
>>>>> +++ b/include/dt-bindings/clock/aspeed-clock.h
>>>>> @@ -46,11 +46,12 @@
>>>>>   #define ASPEED_RESET_MCTP		1
>>>>>   #define ASPEED_RESET_ADC		2
>>>>>   #define ASPEED_RESET_JTAG_MASTER	3
>>>>> -#define ASPEED_RESET_MIC		4
>>>>> +#define ASPEED_RESET_HACE		4
>>>>
>>>> I did not ack such change. This is a significant change from previous
>>>> version, invalidating my previous ack.
>>>>
>>>> This breaks the ABI, so NAK without proper explanation why ABI break
>>>> is accepted.
>>>
>>> I changed the original define (MIC) into different value (see below diff), and
>> add a new define for HACE.
>>> How does that break the ABI? I'll be appreciated if you can explain it more
>> details.
>>> And sorry for not remove ack with new change.
>>
>> Yes, this breaks ABI. Previously the ASPEED_RESET_MIC define had value of 4,
>> now it has value of something else.
> 
> Got your point. I'll re-define HACE without modifying ABI.
> Thanks for your suggestion.
> 

As per HW manuals, new def is correct for AST2500, but not for AST2400.

AST2500:
SCU04[4] = HACE
SCU04[18] = MIC

AST2400:
SCU04[4] = MIC
SCU04[18] = HACE

The header file is shared between AST2400 and AST2500 (aspeed-g4.dtsi
and aspeed-g5.dtsi), which needs to be split into separate header files
given the collision.

Also, It will be better to split AST2500 and AST2600 changes in separate
patches.

Regards,
Dhananjay