linux-kernel - Re: [PATCH v3 2/8] mfd / platform: cros_ec: move lightbar attributes to its own driver.

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Date:   Mon, 3 Dec 2018 23:21:34 +0100
From:   Enric Balletbo i Serra <enric.balletbo@...labora.com>
To:     Lee Jones <lee.jones@...aro.org>
Cc:     gwendal@...omium.org, drinkcat@...omium.org,
        linux-kernel@...r.kernel.org, groeck@...omium.org,
        kernel@...labora.com, bleung@...omium.org,
        Olof Johansson <olof@...om.net>
Subject: Re: [PATCH v3 2/8] mfd / platform: cros_ec: move lightbar attributes
 to its own driver.

Hi Lee,

On 3/12/18 11:36, Lee Jones wrote:
> On Tue, 27 Nov 2018, Enric Balletbo i Serra wrote:
> 
>> The entire way how cros sysfs attibutes are created is broken.
>> cros_ec_lightbar should be its own driver and its attributes should be
>> associated with a lightbar driver not the mfd driver. In order to retain
>> the path, the lightbar attributes are attached to the cros_class.
> 
> I'm not exactly clear on what a lightbar is, but shouldn't it live in
> the appropriate subsystem.  Like LED for example?
> 

The lightbar is a four-color indicator available on some Chromebook, but the
fact that can you can program this lightbar with different sequences, including
user defined sequences makes the device a bit special and very chrome platform
specific. The same happens with the VBC driver.

Other subdevices like, rtc, keyboard, usbpd charger,etc. are already in their
subsystems.

>> The patch also adds the sysfs documentation.
>>
>> Signed-off-by: Enric Balletbo i Serra <enric.balletbo@...labora.com>
>> ---
>>
>> Changes in v3:
>> - Removed unneded check for ec_dev.
>>
>> Changes in v2:
>> - Removed the two exported functions to attach/detach to the cros_class.
>> - Use dev_warn instead of dev_err when adding the lightbar.
>>
>>  ...sfs-class-chromeos-driver-cros-ec-lightbar | 74 +++++++++++++++
>>  drivers/mfd/cros_ec_dev.c                     | 24 ++---
>>  drivers/mfd/cros_ec_dev.h                     |  6 --
>>  drivers/platform/chrome/Kconfig               | 10 ++
>>  drivers/platform/chrome/Makefile              |  3 +-
>>  drivers/platform/chrome/cros_ec_lightbar.c    | 95 ++++++++++++++-----
>>  include/linux/mfd/cros_ec.h                   |  1 -
>>  7 files changed, 172 insertions(+), 41 deletions(-)
>>  create mode 100644 Documentation/ABI/testing/sysfs-class-chromeos-driver-cros-ec-lightbar
>