linux-kernel - Re: [PATCH v5 03/11] mfd / platform: cros_ec: Miscellaneous character device to talk with the EC

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Message-ID: <20190812072453.GG4594@dell>
Date:   Mon, 12 Aug 2019 08:24:53 +0100
From:   Lee Jones <lee.jones@...aro.org>
To:     Enric Balletbo i Serra <enric.balletbo@...labora.com>
Cc:     linux-kernel@...r.kernel.org, Jonathan Corbet <corbet@....net>,
        Krzysztof Kozlowski <krzk@...nel.org>,
        Will Deacon <will.deacon@....com>,
        MyungJoo Ham <myungjoo.ham@...sung.com>,
        Chanwoo Choi <cw00.choi@...sung.com>,
        Benson Leung <bleung@...omium.org>,
        Guenter Roeck <groeck@...omium.org>,
        Jonathan Cameron <jic23@...nel.org>,
        Dmitry Torokhov <dmitry.torokhov@...il.com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Sebastian Reichel <sre@...nel.org>,
        Thierry Reding <thierry.reding@...il.com>,
        Alexandre Belloni <alexandre.belloni@...tlin.com>,
        Liam Girdwood <lgirdwood@...il.com>,
        Mark Brown <broonie@...nel.org>,
        Neil Armstrong <narmstrong@...libre.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Collabora kernel ML <kernel@...labora.com>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Gwendal Grignou <gwendal@...omium.org>
Subject: Re: [PATCH v5 03/11] mfd / platform: cros_ec: Miscellaneous
 character device to talk with the EC

On Mon, 22 Jul 2019, Enric Balletbo i Serra wrote:

> That's a driver to talk with the ChromeOS Embedded Controller via a
> miscellaneous character device, it creates an entry in /dev for every
> instance and implements basic file operations for communicating with the
> Embedded Controller with an userspace application. The API is moved to
> the uapi folder, which is supposed to contain the user space API of the
> kernel.
> 
> Note that this will replace current character device interface
> implemented in the cros-ec-dev driver in the MFD subsystem. The idea is
> to move all the functionality that extends the bounds of what MFD was
> designed to platform/chrome subsystem.
> 
> Signed-off-by: Enric Balletbo i Serra <enric.balletbo@...labora.com>
> Acked-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
> Reviewed-by: Gwendal Grignou <gwendal@...omium.org>
> Tested-by: Gwendal Grignou <gwendal@...omium.org>
> ---
> 
> Changes in v5:
> - Prefix the versions strings with CROS_EC_DEV_VERSION (Gwendal)
> 
> Changes in v4: None
> Changes in v3:
> - Fix 'linux/mfd/cros_ec.h' is not exported (reported by lkp)
> 
> Changes in v2:
> - Remove the list, and the lock, as are not needed (Greg Kroah-Hartman)
> - Remove dev_info in probe, anyway we will see the chardev or not if the
>   probe fails (Greg Kroah-Hartman)
> 
>  drivers/mfd/cros_ec_dev.c                     |   4 +-
>  drivers/platform/chrome/Kconfig               |  11 +
>  drivers/platform/chrome/Makefile              |   1 +
>  drivers/platform/chrome/cros_ec_chardev.c     | 252 ++++++++++++++++++
>  .../uapi/linux/cros_ec_chardev.h              |   9 +-
>  5 files changed, 271 insertions(+), 6 deletions(-)
>  create mode 100644 drivers/platform/chrome/cros_ec_chardev.c
>  rename drivers/mfd/cros_ec_dev.h => include/uapi/linux/cros_ec_chardev.h (80%)

For my own reference:
  Acked-for-MFD-by: Lee Jones <lee.jones@...aro.org>

-- 
Lee Jones [李琼斯]
Linaro Services Technical Lead
Linaro.org │ Open source software for ARM SoCs
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