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Subject: Re: [PATCH v9 0/2] spi: cadence-quadpsi: Add support for the Cadence
 QSPI controller
To:     Mark Brown <broonie@kernel.org>,
        Simon Goldschmidt <simon.k.r.goldschmidt@gmail.com>
Cc:     linux-kernel <linux-kernel@vger.kernel.org>,
        linux-spi@vger.kernel.org, Vignesh R <vigneshr@ti.com>,
        Mark Rutland <mark.rutland@arm.com>,
        Rob Herring <robh+dt@kernel.org>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@vger.kernel.org>, dan.carpenter@oracle.com,
        cheol.yong.kim@intel.com, qi-ming.wu@intel.com
References: <20200214114618.29704-1-vadivel.muruganx.ramuthevar@linux.intel.com>
 <CAAh8qsxnRSwonuEPrriuS=gUMTjt8ddUVy5HxegmoCk-FoE4qg@mail.gmail.com>
 <20200214121145.GF4827@sirena.org.uk>
From:   "Ramuthevar, Vadivel MuruganX" 
        <vadivel.muruganx.ramuthevar@linux.intel.com>
Message-ID: <7d264baf-1ea8-8ada-d93f-df55600a59e9@linux.intel.com>
Date:   Mon, 17 Feb 2020 18:09:08 +0800
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Hi Mark,

On 14/2/2020 8:11 PM, Mark Brown wrote:
> On Fri, Feb 14, 2020 at 01:02:22PM +0100, Simon Goldschmidt wrote:
>> On Fri, Feb 14, 2020 at 12:46 PM Ramuthevar,Vadivel MuruganX
>> <vadivel.muruganx.ramuthevar@linux.intel.com> wrote:
>>> Add support for the Cadence QSPI controller. This controller is
>>> present in the Intel Lightning Mountain(LGM) SoCs, Altera and TI SoCs.
>>> This driver has been tested on the Intel LGM SoCs.
>> This is v9 and still, none of the altera maintainers are on CC?
>> How will it be ensured that this doesn't break altera if it is merged?
> Given that this is a new driver I'd be very surprised if it broke other
> users?  I can imagine it might not work for them and it would definitely
> be much better to get their review but it shouldn't be any worse than
> the current lack of support.
Thanks for the clarification, Please kindly see the below discussion b/w
Vignesh and Dinh in the earlier mail chain.

[Vignesh]? The legacy driver under drivers/mtd/spi-nor will be removed 
as we cannot
support both SPI NOR and SPI NAND with single driver if its under
spi-nor. New driver should be functionally equivalent to existing one.
So I suggest you test this driver on legcay SoCFPGA products.

[Dinh]?? I don't have the original patch series, but will monitor going 
forward.
As long as the new driver does not break legacy SoCFPGA products that
use the cadence-quadspi driver then it should be ok.

Regards
vadivel