linux-kernel - Re: [PATCH v3 01/12] mmc: mediatek: add support of mt2701/mt2712

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Message-ID: <d682718b-4b62-efa8-0756-ee0fa72fc1a1@gmail.com>
Date:   Tue, 10 Oct 2017 10:32:39 +0200
From:   Matthias Brugger <matthias.bgg@...il.com>
To:     Chaotian Jing <chaotian.jing@...iatek.com>,
        Ulf Hansson <ulf.hansson@...aro.org>
Cc:     Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will.deacon@....com>,
        yong mao <yong.mao@...iatek.com>,
        Linus Walleij <linus.walleij@...aro.org>,
        Heiner Kallweit <hkallweit1@...il.com>,
        Phong LE <ple@...libre.com>,
        "linux-mmc@...r.kernel.org" <linux-mmc@...r.kernel.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        linux-mediatek@...ts.infradead.org,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        srv_heupstream <srv_heupstream@...iatek.com>
Subject: Re: [PATCH v3 01/12] mmc: mediatek: add support of mt2701/mt2712



On 10/10/2017 10:22 AM, Chaotian Jing wrote:
> On Tue, 2017-10-10 at 10:09 +0200, Ulf Hansson wrote:
>> On 10 October 2017 at 09:35, Chaotian Jing <chaotian.jing@...iatek.com> wrote:
>>> On Tue, 2017-10-10 at 09:26 +0200, Ulf Hansson wrote:
>>>> [...]
>>>>
>>>>> +
>>>>> +static const struct of_device_id msdc_of_ids[] = {
>>>>> +       { .compatible = "mediatek,mt8135-mmc", .data = &mt8135_compat},
>>>>> +       { .compatible = "mediatek,mt8173-mmc", .data = &mt8173_compat},
>>>>> +       { .compatible = "mediatek,mt2701-mmc", .data = &mt2701_compat},
>>>>> +       { .compatible = "mediatek,mt2712-mmc", .data = &mt2712_compat},
>>>>> +       {}
>>>>> +};
>>>>> +MODULE_DEVICE_TABLE(of, msdc_of_ids);
>>>>
>>>> As already stated in the other reply. These new compatible changes
>>>> needs to be discussed and acked before the driver starts using them.
>>>>
>>>> In other words, make patch3 to precede this one.
>>> but, then there will have a probe issue as mentioned in previous mail
>>> list. that's why I separate the binding file changes to 2 patches.
>>
>> That sounds seriously wrong. Aren't the bindings backwards compatible?
>>
>> Kind regards
>> Uffe
> 
> As Matthias mentioned before:
> "
>>> NAK, this has to be:
>>> You have to add the fallback compatible ("mediatek,mt8135-mmc") to
> the binding
>>> description as otherwise the driver does not get probed.
>>>
>>> Regards,
>>> Matthias
> "
> the original compatible in driver is "mediatek,mt8135-mmc", so that if
> drop "mediatek,mt8135-mmc" in bindings file(User may refer it and drop
> "mediatek,mt8135-mmc" in their DTS), the driver will not get probed.
> 

If you change the driver as you did in this patch, then there is no probing problem.

Regards,
Matthias