linux-kernel - [PATCH 0/2] i2c: Don't assume bus nr 0 if none was specified

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Date:	Fri, 16 Mar 2012 13:19:01 +0100
From:	Karol Lewandowski <k.lewandowsk@...sung.com>
To:	w.sang@...gutronix.de
Cc:	ben-linux@...ff.org, khali@...ux-fr.org, linux-i2c@...r.kernel.org,
	linux-kernel@...r.kernel.org, hskinnemoen@...il.com,
	dirk.brandewie@...il.com, bigeasy@...utronix.de,
	m.szyprowski@...sung.com, grant.likely@...retlab.ca,
	kyungmin.park@...sung.com,
	Karol Lewandowski <k.lewandowsk@...sung.com>
Subject: [PATCH 0/2] i2c: Don't assume bus nr 0 if none was specified

Hi,

i2c controller drivers used to assume bus number 0 when none (-1) was specified.

This worked on non-device tree systems, where one could explicitly specify
bus number via platform data.  On DT-enabled systems bus number is always -1.

Some drivers assume bus number 0 when -1 is specified.  This patchset kills
this logic and switches to dynamic bus allocation (default when -1 is provided[1]).

[ I've found out this when I've tried to instantiate more than one i2c-gpio
  instance on DT-enabled system. I've, hopefully, fixed few other drivers too. ]

[1] Introduced by Grant Likely in 488bf314b ("i2c: Allow i2c_add_numbered_adapter()
    to assign a bus id")

Karol Lewandowski (2):
  i2c-pxa: Drop leftover comment
  i2c: Dynamically assign adapter id if it wasn't explictly specified

 drivers/i2c/busses/i2c-gpio.c         |    7 +------
 drivers/i2c/busses/i2c-octeon.c       |    2 +-
 drivers/i2c/busses/i2c-pca-platform.c |    2 +-
 drivers/i2c/busses/i2c-pxa.c          |    5 -----
 drivers/i2c/busses/i2c-versatile.c    |    9 ++-------
 5 files changed, 5 insertions(+), 20 deletions(-)

-- 
1.7.9

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