linux-kernel - Re: [PATCH v6 6/8] mfd: cros_ec: Support multiple EC in a system

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Date:	Fri, 05 Jun 2015 12:20:00 +0200
From:	Javier Martinez Canillas <javier.martinez@...labora.co.uk>
To:	Lee Jones <lee.jones@...aro.org>
CC:	Samuel Ortiz <sameo@...ux.intel.com>,
	Olof Johansson <olof@...om.net>,
	Doug Anderson <dianders@...omium.org>,
	Bill Richardson <wfrichar@...omium.org>,
	Simon Glass <sjg@...gle.com>,
	Gwendal Grignou <gwendal@...gle.com>,
	Stephen Barber <smbarber@...omium.org>,
	Filipe Brandenburger <filbranden@...gle.com>,
	Todd Broch <tbroch@...omium.org>,
	Alexandru M Stan <amstan@...omium.org>,
	Heiko Stuebner <heiko@...ech.de>,
	linux-samsung-soc@...r.kernel.org, linux-kernel@...r.kernel.org,
	devicetree@...r.kernel.org, Gwendal Grignou <gwendal@...omium.org>
Subject: Re: [PATCH v6 6/8] mfd: cros_ec: Support multiple EC in a system

Hello Lee,

On 06/05/2015 12:17 PM, Lee Jones wrote:
> On Thu, 04 Jun 2015, Javier Martinez Canillas wrote:
> 
>> From: Gwendal Grignou <gwendal@...omium.org>
>> 
>> Chromebooks can have more than one Embedded Controller so the
>> cros_ec device id has to be incremented for each EC registered.
>> 
>> Add a new structure to represent multiple EC as different char
>> devices (e.g: /dev/cros_ec, /dev/cros_pd). It connects to
>> cros_ec_device and allows sysfs inferface for cros_pd.
>> 
>> Also reduce number of allocated objects, make chromeos sysfs
>> class object a static and add refcounting to prevent object
>> deletion while command is in progress.
>> 
>> Signed-off-by: Gwendal Grignou <gwendal@...omium.org>
>> Reviewed-by: Dmitry Torokhov <dtor@...omium.org>
>> Signed-off-by: Javier Martinez Canillas <javier.martinez@...labora.co.uk>
>> Tested-by: Heiko Stuebner <heiko@...ech.de>
>> ---
>> 
>> Changes since v5:
>>  - Don't allow to change the device name from DT. Suggested by Lee Jones.
>>  - Expand error messages in case of mfd_add_devices() failure.
>>    Suggested by Lee Jones.
>> 
>> Changes since v4:
>>  - Use cros-ec-name DT property instead of devname. Suggested by Lee Jones.
>>  - Pass PLATFORM_DEVID_AUTO directly to mfd_add_devices().
>>    Suggested by Lee Jones.
>>  - Add Heiko Stuebner tested-by tag.
>>  - Fix get_version by passing the cmd_offset to EC_CMD_GET_VERSION.
>> 
>> Changes since v3:
>>  - Add defines for the EC and PD index constants.
>>  - Remove cros_ec_dev_register() and declare the mfd_cells as static structs.
>>    Suggested by Lee Jones.
>>  - Add a new line before the return statement in cros_ec_dev_register().
>>    Suggested by Lee Jones.
>> 
>> Changes since v2: None
>> 
>> Changes since v1:
>>   - Squash patch that adds support to represent EC's as different
>>     char devices (e.g: /dev/cros_ec, /dev/cros_pd):
>>     https://chromium-review.googlesource.com/#/c/217297/
>>     Suggested by Gwendal Grignou
>>   - Use cros_ec instead of cros-ec in the subject line to be consistent.
>>     Suggested by Gwendal Grignou
>> ---
>>  drivers/input/keyboard/cros_ec_keyb.c      |   2 +-
>>  drivers/mfd/cros_ec.c                      |  52 ++++++++++--
>>  drivers/mfd/cros_ec_i2c.c                  |   1 -
>>  drivers/mfd/cros_ec_spi.c                  |   1 -
>>  drivers/platform/chrome/cros_ec_dev.c      | 130 ++++++++++++++++++++---------
>>  drivers/platform/chrome/cros_ec_dev.h      |   7 --
>>  drivers/platform/chrome/cros_ec_lightbar.c |  75 +++++++++--------
>>  drivers/platform/chrome/cros_ec_lpc.c      |   1 -
>>  drivers/platform/chrome/cros_ec_sysfs.c    |  48 +++++------
>>  include/linux/mfd/cros_ec.h                |  44 ++++++++--
>>  10 files changed, 234 insertions(+), 127 deletions(-)
> 
> For my own reference:
>   Acked-by: Lee Jones <lee.jones@...aro.org>
> 
> Let me know when you have all the appropriate Acks and I'll apply the
> set.
>

I will, thanks a lot for your help and all the feedback.

Best regards,
Javier

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