linux-kernel - Re: [PATCH 01/10] mtd: spi-nor: aspeed: Rename Kconfig option

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Date:   Mon, 28 Feb 2022 15:37:44 +0100
From:   Cédric Le Goater <clg@...d.org>
To:     Joel Stanley <joel@....id.au>
CC:     Pratyush Yadav <p.yadav@...com>, <linux-spi@...r.kernel.org>,
        linux-mtd <linux-mtd@...ts.infradead.org>,
        Mark Brown <broonie@...nel.org>,
        Tudor Ambarus <tudor.ambarus@...rochip.com>,
        Miquel Raynal <miquel.raynal@...tlin.com>,
        Richard Weinberger <richard@....at>,
        Vignesh Raghavendra <vigneshr@...com>,
        linux-aspeed <linux-aspeed@...ts.ozlabs.org>,
        Andrew Jeffery <andrew@...id.au>,
        Chin-Ting Kuo <chin-ting_kuo@...eedtech.com>,
        devicetree <devicetree@...r.kernel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 01/10] mtd: spi-nor: aspeed: Rename Kconfig option

On 2/28/22 07:07, Joel Stanley wrote:
> On Sun, 27 Feb 2022 at 18:50, Cédric Le Goater <clg@...d.org> wrote:
>>
>> On 2/25/22 08:31, Pratyush Yadav wrote:
>>> On 14/02/22 10:42AM, Cédric Le Goater wrote:
>>>> To prepare transition to the new Aspeed SMC SPI controller driver using
>>>> the spi-mem interface, change the kernel CONFIG option of the current
>>>> driver to reflect that the implementation uses the MTD SPI-NOR interface.
>>>> Once the new driver is sufficiently exposed, we should remove the old one.
>>>
>>> I don't quite understand the reasoning behind this. Why keep the old
>>> driver around? Why not directly replace it with the new one? Does the
>>> new one have any limitations that this one doesn't?
>>
>> No. The old one has more limitations than the new one. The old one in
>> mainline is half baked since we could never merge the necessary bits
>> for training. We have been keeping a full version in the OpenBMC tree.
>>
>> Joel, could we simply drop the old driver in mainline and keep the old
>> one in the OpenBMC tree until we feel comfortable ? I guess we need
>> more testing.
> 
> I would answer Pratyush's question with: the old one is well tested,
> and the new one is not. We would intend to keep the old one around for
> a release cycle or two, and once we're confident the new one is stable
> we would remove the old.

yes but we could handle the transition in the OpenBMC tree without putting
the burden on mainline.
  
mainline would only have the newer spi-mem based driver, the OpenBMC tree
would have it also, along with the older SPI-NOR based driver.

So this patch renaming the Kconfig option would only apply to the OpenBMC
tree.

C.