linux-kernel - Re: [PATCH 08/16] drivers/fsi: Add crc4 helpers

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Message-ID: <81146f25-05fa-70f9-e8ff-49c17aede8f2@ozlabs.org>
Date:   Thu, 8 Dec 2016 10:33:08 +1100
From:   Jeremy Kerr <jk@...abs.org>
To:     Greg KH <gregkh@...uxfoundation.org>,
        Chris Bostic <christopher.lee.bostic@...il.com>
Cc:     robh+dt@...nel.org, mark.rutland@....com, linux@...linux.org.uk,
        sre@...nel.org, mturquette@...libre.com, geert+renesas@...der.be,
        devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        joel@....id.au, linux-kernel@...r.kernel.org, andrew@...id.au,
        alistair@...ple.id.au, benh@...nel.crashing.org,
        Chris Bostic <cbostic@...ibm.com>
Subject: Re: [PATCH 08/16] drivers/fsi: Add crc4 helpers

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?

Cheers,


Jeremy