linux-kernel - Re: [PATCH] i2c: piix4: Replace piix4_smbus driver's cd6h/cd7h port io accesses with mmio accesses

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Date:   Thu, 13 Jan 2022 08:42:32 +0100
From:   Wolfram Sang <wsa@...nel.org>
To:     Terry Bowman <Terry.Bowman@....com>
Cc:     Andy Shevchenko <andy.shevchenko@...il.com>,
        Guenter Roeck <linux@...ck-us.net>,
        Jean Delvare <jdelvare@...e.de>,
        linux-i2c <linux-i2c@...r.kernel.org>,
        linux-watchdog@...r.kernel.org,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Tom Lendacky <thomas.lendacky@....com>,
        Robert Richter <rrichter@....com>
Subject: Re: [PATCH] i2c: piix4: Replace piix4_smbus driver's cd6h/cd7h port
 io accesses with mmio accesses


> > On top of that I'm wondering why slow I/O is used? Do we have anything
> > that really needs that or is it simply a cargo-cult?
> 
> The efch SMBUS & WDT previously only supported a port I/O interface 
> (until recently) and thus dictated the HW access method.  

Is this enough information to start v2 of this series? Or does the
approach need more discussion?


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