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

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Date:	Thu, 29 Jan 2015 22:11:29 +0100
From:	Paul Bolle <pebolle@...cali.nl>
To:	Javier Martinez Canillas <javier.martinez@...labora.co.uk>
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

Javier,

Trivial nits below.

On Thu, 2015-01-29 at 14:37 +0100, Javier Martinez Canillas wrote:
> From: Bill Richardson <wfrichar@...omium.org>
> 
> Chromebooks have an Embedded Controller (EC) that is used to
> implement various functions such as keyboard, power and battery.
> 
> The AP can communicate with the EC through different bus types
> such as I2C, SPI or LPC.
> 
> The cros_ec mfd driver is then composed of a core driver that
> register the sub-devices as mfd cells and provide a high level
> communication interface that is used by the rest of the kernel
> and bus specific interfaces modules.
> 
> Each connection method then has its own driver, which register
> with the EC driver interface-agnostic interface.
> 
> Currently, there are drivers to communicate with the EC over
> I2C and SPI and this driver adds support for LPC.
> 
> Signed-off-by: Bill Richardson <wfrichar@...omium.org>
> Signed-off-by: Javier Martinez Canillas <javier.martinez@...labora.co.uk>
> [...]
>  drivers/misc/Kconfig       |  10 ++
>  drivers/misc/Makefile      |   1 +
>  drivers/misc/cros_ec_lpc.c | 291 +++++++++++++++++++++++++++++++++++++++++++++
>  3 files changed, 302 insertions(+)
>  create mode 100644 drivers/misc/cros_ec_lpc.c
> 
> diff --git a/drivers/misc/Kconfig b/drivers/misc/Kconfig
> index 006242c8bca0..142393e84a43 100644
> --- a/drivers/misc/Kconfig
> +++ b/drivers/misc/Kconfig
> @@ -515,6 +515,16 @@ config VEXPRESS_SYSCFG
>  	  bus. System Configuration interface is one of the possible means
>  	  of generating transactions on this bus.
>  
> +config CROS_EC_LPC
> +	tristate "ChromeOS Embedded Controller (LPC)"
> +	depends on MFD_CROS_EC
> +

Please drop this empty line.

> +	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?

>  source "drivers/misc/c2port/Kconfig"
>  source "drivers/misc/eeprom/Kconfig"
>  source "drivers/misc/cb710/Kconfig"


Paul Bolle

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