linux-kernel - Re: [PATCH v1 0/2] SPI-NOR add NPCM FIU controller driver

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Message-ID: <20181203153046.0554854f@bbrezillon>
Date:   Mon, 3 Dec 2018 15:30:46 +0100
From:   Boris Brezillon <boris.brezillon@...tlin.com>
To:     Tomer Maimon <tmaimon77@...il.com>
Cc:     David Woodhouse <dwmw2@...radead.org>, computersforpeace@...il.com,
        marek.vasut@...il.com, richard@....at,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Nancy Yuen <yuenn@...gle.com>,
        Patrick Venture <venture@...gle.com>,
        Brendan Higgins <brendanhiggins@...gle.com>,
        Avi Fishman <avifishman70@...il.com>,
        Joel Stanley <joel@....id.au>, linux-mtd@...ts.infradead.org,
        OpenBMC Maillist <openbmc@...ts.ozlabs.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        devicetree <devicetree@...r.kernel.org>
Subject: Re: [PATCH v1 0/2] SPI-NOR add NPCM FIU controller driver

Hi Tomer;

On Mon, 3 Dec 2018 16:09:19 +0200
Tomer Maimon <tmaimon77@...il.com> wrote:


> A few comments/input:
> 
> 
>    1. We have been working on this driver for quite a long time to port it
>    to the latest Linux conventions, polish the code, run tests and reach high
>    quality.
>    Our partners and customers are waiting to get this driver upstream so
>    they can freely use it.

Your patch prefix says "v1", so I'm assuming this is the first public
version. I'm sure you spent a lot of time developing this driver
internally, but no matter how long it took, it's a first version for
us, and since we are moving away from the spi_nor controller interface,
I'm not willing to accept new drivers using this interface.

If you want more background about the spi_nor controller interface
deprecation, you can read [1].

>    Since this driver is already in final stages and is in very good shape
>    we will appreciate if you can review this specific driver/interface and
>    help us to upstream it.

Actually, I'd like to do it the other way around: let you rework the
driver to implement the spi-mem interface and review this version.
Otherwise I'll be reviewing things I don't intend to merge anyway.

>    2.  As for the new interface, we are open for any discussion and for
>    porting the driver as required.
>    We are unsure what is this specific interface and weather it really fits
>    a driver for a Flash Interface Controller module (rather than a SPI flash
>    device).

Didn't go through the code in details, but at first glance, it looks
like it would fit pretty well.

>    Is it possible to get a sample driver from another Flash Interface
>    Controller module that was ported to this new interface ?

We recently converted the atmel QSPI driver [2].

Regards,

Boris

[1]https://bootlin.com/blog/spi-mem-bringing-some-consistency-to-the-spi-memory-ecosystem/
[2]https://patchwork.kernel.org/project/spi-devel-general/list/?series=38347&state=*