linux-kernel - Re: [PATCHv4 0/7] Convert exiting EEPROM drivers to NVMEM

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Date:	Wed, 17 Feb 2016 10:17:25 +0000
From:	Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
To:	Andrew Lunn <andrew@...n.ch>, GregKH <greg@...ah.com>
Cc:	maxime.ripard@...e-electrons.com, wsa@...-dreams.de,
	broonie@...nel.org, vz@...ia.com, fd@...com,
	linux-kernel@...r.kernel.org, pantelis.antoniou@...sulko.com,
	bgolaszewski@...libre.com
Subject: Re: [PATCHv4 0/7] Convert exiting EEPROM drivers to NVMEM


Hi Andrew,

Thanks for the patches, they look good.

Do we have any reason why we should not move these drivers from 
drivers/misc/eeprom to drivers/nvmem?


--srini

On 16/02/16 23:41, Andrew Lunn wrote:
> This patch set converts the old EEPROM drivers in driver/misc/eeprom to
> use the NVMEM framework. These drivers export there content in /sys as
> read only to root, since the EEPROM may contain sensitive information.
> So the first patch adds a flag so the NVMEM framework will create its
> file in /sys as root read only.
>
> To keep backwards compatibility with these older drivers, the contents
> of the EEPROM must be exports in sysfs in a file called eeprom in the
> devices node in sys, where as the NVMEM places them under class/nvmem.
> So add this optional backwards compatible to the framework, again
> using a flag.
>
> Then convert the at24, at25 and 93xx46 by adding regmap support,
> removing each drivers own /sys code and registering with the NVMEM
> framework.
>
> AT24 and 93xx46 has been boot tested, at25 compile tested only.
>
> v2:
>
> nvmem_register() now supports a backwards compatible flag, and the
> Kconfig option has been removed.
>
> v3:
>
> Rebase on v4.5-rc1.
> Add a patch to replace memory_accessor in the setup() callbacks with
> nvmem API calls
>
> v4:
>
> Rebase on v4.5-rc3
> Fix lockdep key in patch #2
>
> Andrew Lunn (7):
>    nvmem: Add flag to export NVMEM to root only
>    nvmem: Add backwards compatibility support for older EEPROM drivers.
>    eeprom: at24: extend driver to plug into the NVMEM framework
>    eeprom: at25: Remove in kernel API for accessing the EEPROM
>    eeprom: at25: extend driver to plug into the NVMEM framework
>    eeprom: 93xx46: extend driver to plug into the NVMEM framework
>    misc: at24: replace memory_accessor with nvmem_device_read
>
>   arch/arm/mach-davinci/board-mityomapl138.c |   5 +-
>   arch/arm/mach-davinci/common.c             |   4 +-
>   drivers/misc/eeprom/Kconfig                |   6 ++
>   drivers/misc/eeprom/at24.c                 | 130 +++++++++++++------------
>   drivers/misc/eeprom/at25.c                 | 148 +++++++++++++----------------
>   drivers/misc/eeprom/eeprom_93xx46.c        | 122 +++++++++++++++++++-----
>   drivers/nvmem/core.c                       | 141 +++++++++++++++++++++++++--
>   include/linux/davinci_emac.h               |   4 +-
>   include/linux/memory.h                     |  11 ---
>   include/linux/nvmem-provider.h             |   5 +-
>   include/linux/platform_data/at24.h         |  10 +-
>   include/linux/spi/eeprom.h                 |   2 -
>   12 files changed, 387 insertions(+), 201 deletions(-)
>