linux-kernel - Re: [PATCH 1/6] mmc: dw_mmc: remove the deprecated "clock-freq-min-max" property

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Message-ID: <CAHp75VcthggOwOPjQFNX-xMmK44F99oXYOdeBxfO=euT_JvkoQ@mail.gmail.com>
Date:   Fri, 23 Feb 2018 18:16:39 +0200
From:   Andy Shevchenko <andy.shevchenko@...il.com>
To:     Shawn Lin <shawn.lin@...k-chips.com>
Cc:     Jaehoon Chung <jh80.chung@...sung.com>, linux-mmc@...r.kernel.org,
        devicetree <devicetree@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Ulf Hansson <ulf.hansson@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Joachim Eastwood <manabian@...il.com>, dinguyen@...nel.org,
        Will Deacon <will.deacon@....com>,
        "xuwei (O)" <xuwei5@...ilicon.com>
Subject: Re: [PATCH 1/6] mmc: dw_mmc: remove the deprecated
 "clock-freq-min-max" property

On Fri, Feb 23, 2018 at 4:19 PM, Shawn Lin <shawn.lin@...k-chips.com> wrote:
> On 2018/2/23 21:27, Andy Shevchenko wrote:
>> On Fri, Feb 23, 2018 at 8:41 AM, Jaehoon Chung <jh80.chung@...sung.com>
>> wrote:
>>>
>>> 'clock-freq-min-max' property had already deprecated.
>>> Remove the 'clock-freq-min-max' property that is kept to maintain
>>> the compatibility.
>>
>>
>> Removing a property without telling the user what to expect is a bad
>> idea and ABI breakage.
>>
>
> What's the general process to remove a property?
>
> I guess we should do:
> 1) deprecate it in the first place and remove it from all upstream DT
> 2) wait some long enough days for expecting the stale of all old DTB
> containing that property
> 3) remove the functionality of the deprecated property from the driver
> but still leave some warning there
> 4) remove the left warning finally

I don't know. Perhaps Rob can shed a light here.
But I would really OK with removal of some of such properties from
some drivers where it's more burden to keep them.

> And for the ABI breakage, we should add something in Documentation/ABI
> /obsolete  or Documentation/ABI/removed ?

-- 
With Best Regards,
Andy Shevchenko