linux-kernel - [PATCH 0/8] i2c: improve RECV

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Message-Id: <20210109124314.27466-1-wsa+renesas@sang-engineering.com>
Date:   Sat,  9 Jan 2021 13:43:04 +0100
From:   Wolfram Sang <wsa+renesas@...g-engineering.com>
To:     linux-i2c@...r.kernel.org
Cc:     linux-renesas-soc@...r.kernel.org,
        Wolfram Sang <wsa+renesas@...g-engineering.com>,
        linux-arm-kernel@...ts.infradead.org,
        linux-arm-msm@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-samsung-soc@...r.kernel.org
Subject: [PATCH 0/8] i2c: improve RECV_LEN documentation & usage

Because I want to clarify I2C_M_RECV len usage, this series updates the
documentation and some of its users. Patch 1 refactors the whole
documentation of 'i2c_msg', so all usage of I2C_M_* flags and their
conditions hopefully become clearer. Patch 2+3 remove some obvious
boilerplate in the UAPI headers while here. Patch 4 is a driver fix I
found while working on this series. Patch 5 introduces a new convenience
macro to enable SMBus transfers which need I2C_M_RECV_LEN. Then, some
drivers use the new macro, sometimes to remove boilerplate, sometimes
because these SMBus transfers have been forgotten before.

This series is the first part of a larger work to extend I2C_M_RECV_LEN
to allow larger transfer sizes (as specified in the SMBus 3.0 standard)
and to enable this on Renesas R-Car hardware.

Looking forward to comments and/or reviews; the driver patches are only
build-tested.

Happy hacking,

   Wolfram

Wolfram Sang (8):
  i2c: refactor documentation of struct i2c_msg
  i2c: remove licence boilerplate from main UAPI header
  i2c: remove licence boilerplate from i2c-dev UAPI header
  i2c: octeon: check correct size of maximum RECV_LEN packet
  i2c: uapi: add macro to describe support for all SMBus transfers
  i2c: algo: bit: use new macro to specifiy capabilities
  i2c: qup: advertise SMBus transfers using RECV_LEN
  i2c: s3c2410: advertise SMBus transfers using RECV_LEN

 drivers/i2c/algos/i2c-algo-bit.c     |   4 +-
 drivers/i2c/busses/i2c-octeon-core.c |   2 +-
 drivers/i2c/busses/i2c-qup.c         |   2 +-
 drivers/i2c/busses/i2c-s3c2410.c     |   2 +-
 include/uapi/linux/i2c-dev.h         |  25 ++----
 include/uapi/linux/i2c.h             | 128 ++++++++++++++-------------
 6 files changed, 76 insertions(+), 87 deletions(-)

-- 
2.29.2