linux-kernel - Re: [PATCH v4 3/7] misc: Add cros_ec

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Date:	Mon, 02 Feb 2015 12:57:08 +0100
From:	Javier Martinez Canillas <javier.martinez@...labora.co.uk>
To:	Paul Bolle <pebolle@...cali.nl>
CC:	Lee Jones <lee.jones@...aro.org>, Olof Johansson <olof@...om.net>,
	Arnd Bergmann <arnd@...db.de>,
	Doug Anderson <dianders@...omium.org>,
	Bill Richardson <wfrichar@...omium.org>,
	Simon Glass <sjg@...gle.com>,
	Gwendal Grignou <gwendal@...gle.com>,
	Jonathan Corbet <corbet@....net>,
	Varka Bhadram <varkabhadram@...il.com>,
	linux-samsung-soc@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4 3/7] misc: Add cros_ec_lpc driver for x86 devices

Hello,

On 01/30/2015 01:51 PM, Javier Martinez Canillas wrote:
> On 01/29/2015 10:11 PM, Paul Bolle wrote:
>>> +	help
>>> +	  If you say Y here, you get support for talking to the ChromeOS EC
>>> +	  over an LPC bus. This uses a simple byte-level protocol with a
>>> +	  checksum. This is used for userspace access only. The kernel
>>> +	  typically has its own communication methods.
>>> +
>> 
>> What happens when you say M?
>> 
> 
> Since it is a tristate kconfig symbol, it can be built as a kernel module
> but since there isn't a LPC subsystem, the platform device is registered
> in the module_init() function. So, building as a module is trickier since
> there won't be an uevent that can trigger a module auto-load based on the
> modinfo aliases information.
> 

FYI, I noticed that other x86 platform drivers use the dmi system information
to fill dmi modaliases so the modules are auto-loaded. So I did the same and
posted a new version 5 [0] of this series.

Best regards,
Javier

[0]: https://lkml.org/lkml/2015/2/2/214
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