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Subject: Re: [PATCH v1 2/2] arm64: configs: Support DEVAPC on MediaTek
 platforms
To:     Arnd Bergmann <arnd@kernel.org>
Cc:     Neal Liu <neal.liu@mediatek.com>, Rob Herring <robh+dt@kernel.org>,
        Catalin Marinas <catalin.marinas@arm.com>,
        Will Deacon <will@kernel.org>, SoC Team <soc@kernel.org>,
        DTML <devicetree@vger.kernel.org>,
        wsd_upstream <wsd_upstream@mediatek.com>,
        Hanks Chen <Hanks.Chen@mediatek.com>,
        lkml <linux-kernel@vger.kernel.org>,
        "moderated list:ARM/Mediatek SoC..." 
        <linux-mediatek@lists.infradead.org>,
        Jackson-kt Chang <Jackson-kt.Chang@mediatek.com>,
        Linux ARM <linux-arm-kernel@lists.infradead.org>
References: <1608713092-26952-1-git-send-email-neal.liu@mediatek.com>
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 <68442164-d649-aee0-cfe8-c9ebb868612d@gmail.com>
 <CAK8P3a1DLX6y5GM3O7+T0gMH_JLRp6nUkHFZc4Shjn_bTKWWSw@mail.gmail.com>
From:   Matthias Brugger <matthias.bgg@gmail.com>
Message-ID: <7001eef4-42bd-0c17-50a3-4d619d0fc80a@gmail.com>
Date:   Mon, 1 Feb 2021 09:50:43 +0100
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On 31/01/2021 23:23, Arnd Bergmann wrote:
> On Sun, Jan 31, 2021 at 3:07 PM Matthias Brugger <matthias.bgg@gmail.com> wrote:
>> On 23/12/2020 09:44, Neal Liu wrote:
>>> Support DEVAPC on MediaTek platforms by enabling CONFIG_MTK_DEVAPC.
>>>
>>> Signed-off-by: Neal Liu <neal.liu@mediatek.com>
>>> ---
>>>  arch/arm64/configs/defconfig |    1 +
>>>  1 file changed, 1 insertion(+)
>>>
>>> diff --git a/arch/arm64/configs/defconfig b/arch/arm64/configs/defconfig
>>> index 17a2df6..a373776 100644
>>> --- a/arch/arm64/configs/defconfig
>>> +++ b/arch/arm64/configs/defconfig
>>> @@ -257,6 +257,7 @@ CONFIG_MTD_NAND_MARVELL=y
>>>  CONFIG_MTD_NAND_FSL_IFC=y
>>>  CONFIG_MTD_NAND_QCOM=y
>>>  CONFIG_MTD_SPI_NOR=y
>>> +CONFIG_MTK_DEVAPC=m
>>>  CONFIG_SPI_CADENCE_QUADSPI=y
>>>  CONFIG_BLK_DEV_LOOP=y
>>>  CONFIG_BLK_DEV_NBD=m
>>>
>>
>> From my understanding, defconfig is for a minimal config that allows to boot a
>> machine. As MTK_DEVAPC is a rather exotic driver to detect bus access
>> violations, I think it's not a good candidate for inclusion in defconfig.
>>
>> In any case, I added the SoC maintainer, so that they can correct me, if I'm
>> wrong :)
> 
> I generally don't mind adding platform specific drivers as loadable modules
> even if they are somewhat obscure. For built-in drivers, this is
> different though,
> as those have a noticeable impact on other platforms.
> 
> I haven't kept track of what this particular driver does, but from the Kconfig
> description, I'd say it should get enabled in defconfig.
> 

Thanks for the feedback Arnd.
Applied now to v5.11-next/defconfig