linux-kernel - Re: [PATCH v5 3/3] i2c: piix4: Add ACPI support

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Date:   Thu, 29 Aug 2019 22:21:02 +0200
From:   Wolfram Sang <wsa@...-dreams.de>
To:     Jean Delvare <jdelvare@...e.de>
Cc:     Linux I2C <linux-i2c@...r.kernel.org>,
        linux-kernel@...r.kernel.org, Andrew Cooks <acooks@...ionali.st>,
        linux-acpi@...r.kernel.org, platypus-sw@...ngear.com,
        "Tobin C . Harding" <me@...in.cc>,
        Guenter Roeck <linux@...ck-us.net>,
        Will Wagner <willw@...allon.com>
Subject: Re: [PATCH v5 3/3] i2c: piix4: Add ACPI support

On Fri, Aug 02, 2019 at 02:55:26PM +0200, Jean Delvare wrote:
> Enable the i2c-piix4 SMBus controller driver to enumerate I2C slave
> devices using ACPI. It builds on the related I2C mux device work
> in commit 8eb5c87a92c0 ("i2c: add ACPI support for I2C mux ports")
> 
> In the i2c-piix4 driver the adapters are enumerated as:
>  Main SMBus adapter Port 0, Port 2, ..., aux port (i.e., ASF adapter)
> 
> However, in the AMD BKDG documentation[1], the implied order of ports is:
>  Main SMBus adapter Port 0, ASF adapter, Port 2, Port 3, ...
> 
> This ordering difference is unfortunate. We assume that ACPI
> developers will use the AMD documentation ordering, so we have to
> pass an extra parameter to piix4_add_adapter().
> 
> [1] 52740 BIOS and Kernel Developer's Guide (BKDG) for AMD Family 16h
> Models 30h-3Fh Processors
> 
> Based on earlier work by Andrew Cooks.
> 
> Reported-by: Andrew Cooks <andrew.cooks@...ngear.com>
> Signed-off-by: Jean Delvare <jdelvare@...e.de>

Applied to for-next, thanks!


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