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From: Christopher Bostic <christopher.lee.bostic@gmail.com>
Date: Thu, 8 Dec 2016 13:43:33 -0600
Message-ID: <CAA0LjjVuHoggi+vMHMo6OFRfVxY7im5pEAYPGUefrci7NjPncg@mail.gmail.com>
Subject: Re: [PATCH 08/16] drivers/fsi: Add crc4 helpers
To: Jeremy Kerr <jk@ozlabs.org>
Cc: Greg KH <gregkh@linuxfoundation.org>, Rob Herring <robh+dt@kernel.org>,
        Mark Rutland <mark.rutland@arm.com>, linux@armlinux.org.uk,
        sre@kernel.org, Michael Turquette <mturquette@baylibre.com>,
        geert+renesas@glider.be,
        Open List OF Flattened dev tree bindings 
        <devicetree@vger.kernel.org>,
        "Moderated list: ARM PORT" <linux-arm-kernel@lists.infradead.org>,
        Joel Stanley <joel@jms.id.au>,
        Linux open list <linux-kernel@vger.kernel.org>,
        Andrew Jeffery <andrew@aj.id.au>,
        Alistair Popple <alistair@popple.id.au>,
        Benjamin Herrenschmidt <benh@kernel.crashing.org>,
        Chris Bostic <cbostic@us.ibm.com>
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On Wed, Dec 7, 2016 at 5:33 PM, Jeremy Kerr <jk@ozlabs.org> wrote:
> Hi Greg,
>
>> Why not just create lib/crc4.c with these functions, like the other crc
>> functions in the kernel?
>
> Two (bad) reasons:
>
>  - The crc4 implementation here is pretty specific to the FSI
>    usage (only supporting 4-bit-sized chunks), to keep the math & lookup
>    table simple
>
>  - I'm lazy
>
> So yes, we should spend the effort now to make this generic enough for
> a lib/crc4.c. Would we want to support different values for the
> polynomial?
>
> Chris: do you want me to to that, or will you?

Hi Jeremy,

I'll take this one.  Will implement as per Greg's suggestions.

Thanks,
Chris

>
> Cheers,
>
>
> Jeremy