linux-kernel - [PATCH V3 0/4] AT91: replace broken TWI driver i2c-at91.c

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Date:	Tue, 8 Nov 2011 12:52:22 +0100
From:	Nikolaus Voss <n.voss@...nmann.de>
To:	linux-i2c@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org
Cc:	ben-linux@...ff.org, khali@...ux-fr.org, nicolas.ferre@...el.com,
	rmallon@...il.com, balbi@...com
Subject: [PATCH V3 0/4] AT91: replace broken TWI driver i2c-at91.c

The old driver has two main deficencies:
i)  No repeated start (Sr) condiction is possible, this makes it unusable
    e.g. for most SMBus transfers.
ii) I/O was done with polling/busy waiting what caused over-/underruns
    even at light system loads and clock speeds.

The new driver overcomes these deficencies and in addition allows for
more than one TWI interface.

A remaining limitation is the fact, that only one repeated start is
possible (two concatenated messages). This limitation is imposed by
the hardware. However, this should not be a problem as all common
i2c-client communication does not rely on more than one repeated start.

V3: Integrated review comments from Ryan Mallon and Felipe Balbi
V2: Fixed whitespace issue

Nikolaus Voss (4):
  drivers/i2c/busses/i2c-at91.c: remove broken driver
  drivers/i2c/busses/i2c-at91.c: add new driver
  G45 TWI: remove open drain setting for twi function gpios
  Add lookup entries for twi_clk for devices with more than one TWI
    port

 arch/arm/mach-at91/at91sam9g45.c         |    2 +
 arch/arm/mach-at91/at91sam9g45_devices.c |    6 -
 arch/arm/mach-at91/at91sam9rl.c          |    2 +
 drivers/i2c/busses/Kconfig               |   11 +-
 drivers/i2c/busses/i2c-at91.c            |  453 +++++++++++++++++++-----------
 5 files changed, 292 insertions(+), 182 deletions(-)

-- 
1.7.5.4

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