Re: [PATCH] i2c: Detect secondary SMBus controller on AMD AM4 chipsets

[Wolfram Sang <wsa@the-dreams.de>]

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On Fri, Apr 10, 2020 at 03:48:44PM -0500, Adam Honse wrote:
> The AMD X370 and other AM4 chipsets (A/B/X 3/4/5 parts) and Threadripper equivalents have a secondary SMBus controller at I/O port address 0x0B20.  This bus is used by several manufacturers to control motherboard RGB lighting via embedded controllers.  I have been using this bus in my OpenRGB project to control the Aura RGB on many motherboards and ASRock also uses this bus for their Polychrome RGB controller.
> 
> See this kernel bug report: https://bugzilla.kernel.org/show_bug.cgi?id=202587
> 
> I am not aware of any CZ-compatible platforms which do not have the second SMBus channel.  All of AMD's AM4- and Threadripper- series chipsets that OpenRGB users have tested appear to have this secondary bus.  I also noticed this secondary bus is present on older AMD platforms including my FM1 home server.
> 
> Signed-off-by: Adam Honse <calcprogrammer1@gmail.com>
> 

Reformatted the patch description, added Sebastians tags and applied to
for-next, thanks!


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