linux-kernel - [PATCH v11 0/4] AT91: replace old i2c-at91.c TWI driver

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Message-Id: <cover.1345618760.git.n.voss@weinmann.de>
Date:	Wed, 22 Aug 2012 08:59:20 +0200
From:	Nikolaus Voss <n.voss@...nmann.de>
To:	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	linux-i2c@...r.kernel.org
Cc:	nicolas.ferre@...el.com, ben-linux@...ff.org, balbi@...com,
	h.feurstein@...il.com, rmallon@...il.com, adrian.yanes@...to.fi,
	ludovic.desroches@...el.com, carsten.behling@...z-fricke.com
Subject: [PATCH v11 0/4] AT91: replace old i2c-at91.c TWI driver

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.

Changes since v10:
 - fix for flags persistency suggested and tested by Carsten Behling
 - clk_lookup.dev_id entries for at91sam9x5
 - calc_twi_clock fix for sam9261 by Ludovic Desroches

Nikolaus Voss (4):
  drivers/i2c/busses/i2c-at91.c: remove old polling driver
  Replace clk_lookup.con_id with clk_lookup.dev_id entries for twi clk
  drivers/i2c/busses/i2c-at91.c: add new driver
  G45 TWI: remove open drain setting for twi function gpios

 arch/arm/mach-at91/at91rm9200.c            |    1 +
 arch/arm/mach-at91/at91rm9200_devices.c    |    9 +
 arch/arm/mach-at91/at91sam9260.c           |    1 +
 arch/arm/mach-at91/at91sam9261.c           |    1 +
 arch/arm/mach-at91/at91sam9261_devices.c   |    9 +
 arch/arm/mach-at91/at91sam9263.c           |    1 +
 arch/arm/mach-at91/at91sam9g45.c           |    2 +
 arch/arm/mach-at91/at91sam9g45_devices.c   |    6 -
 arch/arm/mach-at91/at91sam9rl.c            |    2 +
 arch/arm/mach-at91/at91sam9x5.c            |    3 +
 arch/arm/mach-at91/include/mach/at91_twi.h |   68 ----
 drivers/i2c/busses/Kconfig                 |   11 +-
 drivers/i2c/busses/i2c-at91.c              |  591 ++++++++++++++++++----------
 13 files changed, 418 insertions(+), 287 deletions(-)
 delete mode 100644 arch/arm/mach-at91/include/mach/at91_twi.h

-- 
1.7.9.5

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