Date:   Mon, 22 Mar 2021 15:32:24 +0100
From:   Bartosz Golaszewski <brgl@...ev.pl>
To:     Joel Becker <jlbec@...lplan.org>, Christoph Hellwig <hch@....de>
Cc:     "open list:GPIO SUBSYSTEM" <linux-gpio@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Shuah Khan <shuah@...nel.org>,
        linux-doc <linux-doc@...r.kernel.org>,
        Bartosz Golaszewski <bgolaszewski@...libre.com>,
        Linus Walleij <linus.walleij@...aro.org>,
        Uwe Kleine-König 
        <u.kleine-koenig@...gutronix.de>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Geert Uytterhoeven <geert@...ux-m68k.org>,
        Kent Gibson <warthog618@...il.com>,
        Jonathan Corbet <corbet@....net>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: Re: [PATCH v5 00/11] gpio: implement the configfs testing module

On Mon, Mar 15, 2021 at 10:14 AM Bartosz Golaszewski <brgl@...ev.pl> wrote:
>
> From: Bartosz Golaszewski <bgolaszewski@...libre.com>
>
> This series adds a new GPIO testing module based on configfs committable items
> and sysfs. The goal is to provide a testing driver that will be configurable
> at runtime (won't need module reload) and easily extensible. The control over
> the attributes is also much more fine-grained than in gpio-mockup.
>
> This series also contains a respin of the patches I sent separately to the
> configfs maintainers - these patches implement the concept of committable
> items that was well defined for a long time but never actually completed.
>
> Apart from the new driver itself, its selftests and the configfs patches, this
> series contains some changes to the bitmap API - most importantly: it adds
> devres managed variants of bitmap_alloc() and bitmap_zalloc().
>
> v1 -> v2:
> - add selftests for gpio-sim
> - add helper programs for selftests
> - update the configfs rename callback to work with the new API introduced in
>   v5.11
> - fix a missing quote in the documentation
> - use !! whenever using bits operation that are required to return 0 or 1
> - use provided bitmap API instead of reimplementing copy or fill operations
> - fix a deadlock in gpio_sim_direction_output()
> - add new read-only configfs attributes for mapping of configfs items to GPIO
>   device names
> - and address other minor issues pointed out in reviews of v1
>
> v2 -> v3:
> - use devm_bitmap_alloc() instead of the zalloc variant if we're initializing
>   the bitmap with 1s
> - drop the patch exporting device_is_bound()
> - don't return -ENODEV from dev_nam and chip_name configfs attributes, return
>   a string indicating that the device is not available yet ('n/a')
> - fix indentation where it makes sense
> - don't protect IDA functions which use their own locking and where it's not
>   needed
> - use kmemdup() instead of kzalloc() + memcpy()
> - collected review tags
> - minor coding style fixes
>
> v3 -> v4:
> - return 'none' instead of 'n/a' from dev_name and chip_name before the device
>   is registered
> - use sysfs_emit() instead of s*printf()
> - drop GPIO_SIM_MAX_PROP as it's only used in an array's definition where it's
>   fine to hardcode the value
>
> v4 -> v5:
> - export devm bitmap functions with EXPORT_SYMBOL_GPL() instead of a simple
>   EXPORT_SYMBOL()
>
> Bartosz Golaszewski (11):
>   configfs: increase the item name length
>   configfs: use (1UL << bit) for internal flags
>   configfs: implement committable items
>   samples: configfs: add a committable group
>   lib: bitmap: remove the 'extern' keyword from function declarations
>   lib: bitmap: order includes alphabetically
>   lib: bitmap: provide devm_bitmap_alloc() and devm_bitmap_zalloc()
>   gpio: sim: new testing module
>   selftests: gpio: provide a helper for reading chip info
>   selftests: gpio: add a helper for reading GPIO line names
>   selftests: gpio: add test cases for gpio-sim
>
>  Documentation/admin-guide/gpio/gpio-sim.rst   |  72 ++
>  Documentation/filesystems/configfs.rst        |   6 +-
>  drivers/gpio/Kconfig                          |   8 +
>  drivers/gpio/Makefile                         |   1 +
>  drivers/gpio/gpio-sim.c                       | 874 ++++++++++++++++++
>  fs/configfs/configfs_internal.h               |  22 +-
>  fs/configfs/dir.c                             | 245 ++++-
>  include/linux/bitmap.h                        | 127 +--
>  include/linux/configfs.h                      |   3 +-
>  lib/bitmap.c                                  |  42 +-
>  samples/configfs/configfs_sample.c            | 153 +++
>  tools/testing/selftests/gpio/.gitignore       |   2 +
>  tools/testing/selftests/gpio/Makefile         |   4 +-
>  tools/testing/selftests/gpio/config           |   1 +
>  tools/testing/selftests/gpio/gpio-chip-info.c |  57 ++
>  tools/testing/selftests/gpio/gpio-line-name.c |  55 ++
>  tools/testing/selftests/gpio/gpio-sim.sh      | 229 +++++
>  17 files changed, 1815 insertions(+), 86 deletions(-)
>  create mode 100644 Documentation/admin-guide/gpio/gpio-sim.rst
>  create mode 100644 drivers/gpio/gpio-sim.c
>  create mode 100644 tools/testing/selftests/gpio/gpio-chip-info.c
>  create mode 100644 tools/testing/selftests/gpio/gpio-line-name.c
>  create mode 100755 tools/testing/selftests/gpio/gpio-sim.sh
>
> --
> 2.30.1
>

Hi Joel, Christoph,

FYI The configfs patches from this series have been on the mailing
list for months (long before the GPIO part) and have been re-sent
several times. You have neither acked or opposed these changes. I
don't want to delay the new testing driver anymore so I intend to
apply the entire series and take it upstream through the GPIO tree by
the end of this week.

Best Regards,
Bartosz Golaszewski

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