linux-kernel - [RESEND RFC 0/3] Proposed extensions for NVMEM

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Message-Id: <1456851552-15913-1-git-send-email-andrew.smirnov@gmail.com>
Date:	Tue,  1 Mar 2016 08:59:09 -0800
From:	Andrey Smirnov <andrew.smirnov@...il.com>
To:	linux-kernel@...r.kernel.org
Cc:	srinivas.kandagatla@...aro.org, maxime.ripard@...e-electrons.com,
	Andrey Smirnov <andrew.smirnov@...il.com>
Subject: [RESEND RFC 0/3] Proposed extensions for NVMEM

Hello,

This RFC introduces two new drivers to NVMEM subsytem. First driver,
'nvmem-blob', serves the purpose of exposing data, embedded in DTB,
via NVMEM consumer API. Second, 'nvmem-composite', allows the user to
combin a number of NVMEM cells (or parts of them) into a single
continuos "blob" of data presented to the rest of the system as a
regular NVMEM device.

The intent of this RFC is to solicit feedback about the approach,
binding or if these features should be accepted upstream in general.

I originally proposed this extentions as a part of Barebox project (Barebox
borrows a lot of concepts from Linux kernel and adopting NVMEM
subsystem was being discussed), in order to facilitate usage of NVMEM
to initialize source of MAC address for a paticular Ethernet adapter
(Barebox would read that value and fixup DT blob with appropriate
value as a part of booting Linux). However the drivers should be
generic enough to not be tied to that case.

Please bear in mind the the code included is a very rough draft and a
lot of error checking/handling code in is was stubbed out.

Any feedback is welcome.

Thank you,
Andrey Smirnov

Andrey Smirnov (3):
  nvmem: Add 'of_nvmem_cell_from_device_node()'
  nvmem: Add 'nvmem-blob' driver
  nvmem: Add 'nvmem-composite' driver

 Documentation/devicetree/bindings/nvmem/blob.txt   |  35 ++++
 .../devicetree/bindings/nvmem/composite.txt        |  44 ++++
 drivers/nvmem/Makefile                             |   2 +
 drivers/nvmem/blob.c                               | 132 ++++++++++++
 drivers/nvmem/composite.c                          | 228 +++++++++++++++++++++
 drivers/nvmem/core.c                               |  44 ++--
 include/linux/nvmem-consumer.h                     |   7 +
 7 files changed, 479 insertions(+), 13 deletions(-)
 create mode 100644 Documentation/devicetree/bindings/nvmem/blob.txt
 create mode 100644 Documentation/devicetree/bindings/nvmem/composite.txt
 create mode 100644 drivers/nvmem/blob.c
 create mode 100644 drivers/nvmem/composite.c

-- 
2.5.0