linux-kernel - Re: [PATCH v3 00/21] nvmem: rework of the subsystem for non-DT users

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Date:   Fri, 14 Sep 2018 16:43:13 +0200
From:   Bartosz Golaszewski <brgl@...ev.pl>
To:     Srinivas Kandagatla <srinivas.kandagatla@...aro.org>,
        "David S . Miller" <davem@...emloft.net>,
        Mauro Carvalho Chehab <mchehab+samsung@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Arnd Bergmann <arnd@...db.de>,
        Jonathan Corbet <corbet@....net>, Sekhar Nori <nsekhar@...com>,
        Kevin Hilman <khilman@...nel.org>,
        David Lechner <david@...hnology.com>,
        Boris Brezillon <boris.brezillon@...tlin.com>,
        Andrew Lunn <andrew@...n.ch>, Alban Bedel <albeu@...e.fr>,
        Maxime Ripard <maxime.ripard@...tlin.com>,
        Chen-Yu Tsai <wens@...e.org>
Cc:     linux-doc <linux-doc@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        Bartosz Golaszewski <bgolaszewski@...libre.com>
Subject: Re: [PATCH v3 00/21] nvmem: rework of the subsystem for non-DT users

2018-09-12 9:51 GMT+02:00 Bartosz Golaszewski <brgl@...ev.pl>:
> From: Bartosz Golaszewski <bgolaszewski@...libre.com>
>
> This series contains nvmem framework changes prerequisite for further
> development of my previous series[1] that aims at removal of the
> platform data struct from at24 EEPROM driver.
>
> The patches are conceptually split into a couple groups.
>
> First five patches fix issues with existing issues.
>
> Patch 6 switches the nvmem providers to using kref which is necessary
> for removal of the return value from nvmem_unregister(). This is an
> approach similar to the one used in the clock framework where the
> provider is only removed after the last reference to it is dropped.
>
> Patches 7-9 convert last remaining users of nvmem_unregister() who
> still check its return value to using devm_nvmem_unregister() and
> patch 10 changes its return value from int to void.
>
> Patches 11-14 introduce the most significant changes of this series:
> we remove the global cell list, add support for static cell definitions
> external to the provider structure, change the way DT lookup works and
> allow to associate resources and consumers using lookup tables. The way
> nvmem_cell_get() for non-DT users is changed but there are no current
> users and it's currently broken anyway (cell being removed after a call
> to nvmem_cell_put()).
>
> Patch 15 updates the documentation.
>
> Patch 16 adds support for notifiers to nvmem so that users can
> subscribe for events such as device or cell registration or removal.
>
> Patches 17 & 18 add some minor improvements to the codebase.
>
> Last three patches contain fixes to warnings emitted by checkpatch.
> It's a good moment to add them if we're already touching a big part
> of the subsystem's code.
>
> Tested both DT and non-DT use cases.
>
> [1] https://lkml.org/lkml/2018/8/10/149
>
> v1 -> v2:
> - extended the lookup structure with a proper con_id independent from the
>   cell name defined in the cell definition table
> - added a patch that makes the naming convention for the cell name argument
>   in the nvmem_cell_get() family of functions consistent
> - there were two users of nvmem_unregister() that still checked the return
>   value, now switched to devm_nvmem_register()
> - fixed build failures reported by kbuild test robot
>
> v2 -> v3:
> - dropped the patch removing unused APIs and introduced changes on top of
>   existing code instead
> - fixed nvmem provider reference decreasing in error paths
> - added checkpatch fixes
> - removed nvmem-machine.h and distributed new definitions among existing
>   consumer and provider headers
> - reordered patches thematically
> - added more patches fixing issues in existing codebase
>
> Bartosz Golaszewski (21):
>   nvmem: provide nvmem_dev_name()
>   nvmem: remove the name field from struct nvmem_device
>   nvmem: use list_for_each_entry_safe in nvmem_device_remove_all_cells()
>   nvmem: remove a stray newline
>   nvmem: check the return value of nvmem_add_cells()
>   nvmem: use kref
>   nvmem: lpc18xx_eeprom: use devm_nvmem_register()
>   nvmem: sunxi_sid: use devm_nvmem_register()
>   nvmem: mxs-ocotp: use devm_nvmem_register()
>   nvmem: change the signature of nvmem_unregister()
>   nvmem: remove the global cell list
>   nvmem: add support for cell info
>   nvmem: resolve cells from DT at registration time
>   nvmem: add support for cell lookups from machine code
>   Documentation: nvmem: document cell tables and lookup entries
>   nvmem: add a notifier chain
>   nvmem: use SPDX license identifiers
>   nvmem: make the naming of arguments in nvmem_cell_get() consistent
>   nvmem: use EOPNOTSUPP instead of ENOSYS
>   nvmem: fix commenting style
>   nvmem: use octal permissions instead of constants
>
>  Documentation/nvmem/nvmem.txt  |  31 ++
>  drivers/nvmem/core.c           | 527 ++++++++++++++++++++++-----------
>  drivers/nvmem/lpc18xx_eeprom.c |   6 +-
>  drivers/nvmem/mxs-ocotp.c      |   4 +-
>  drivers/nvmem/sunxi_sid.c      |  20 +-
>  include/linux/nvmem-consumer.h | 100 +++++--
>  include/linux/nvmem-provider.h |  49 +--
>  7 files changed, 497 insertions(+), 240 deletions(-)
>
> --
> 2.18.0
>

Superseded by v4. This time I made sure all modified drivers build
fine without warnings.

Bart