[PATCH v2 16/21] ipmi: kcs_bmc: Add a "raw" character device interface

Arnd Bergmann arnd at kernel.org
Fri Apr 9 17:55:53 AEST 2021

On Fri, Mar 19, 2021 at 7:31 AM Andrew Jeffery <andrew at aj.id.au> wrote:
> The existing IPMI chardev encodes IPMI behaviours as the name suggests.
> However, KCS devices are useful beyond IPMI (or keyboards), as they
> provide a means to generate IRQs and exchange arbitrary data between a
> BMC and its host system.

I only noticed the series after Joel asked about the DT changes on the arm
side. One question though:

How does this related to the drivers/input/serio/ framework that also talks
to the keyboard controller for things that are not keyboards? Are these
separate communication channels on adjacent I/O ports, or does there
need to be some arbitration?


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