From: Nikolaus Voss <n.voss-+umVssTZoCsb1SvskN2V4Q@public.gmane.org>
To: linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org,
linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
linux-i2c-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
Cc: nicolas.ferre-AIFe0yeh4nAAvxtiuMwx3w@public.gmane.org,
ben-linux-elnMNo+KYs3YtjvyW6yDsg@public.gmane.org,
balbi-l0cyMroinI0@public.gmane.org,
h.feurstein-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org,
rmallon-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org,
adrian.yanes-uOixanVlb7U@public.gmane.org,
ludovic.desroches-AIFe0yeh4nAAvxtiuMwx3w@public.gmane.org,
carsten.behling-0M7HhAU3Y85FsXB23wyQUg@public.gmane.org
Subject: [PATCH v11 0/4] AT91: replace old i2c-at91.c TWI driver
Date: Wed, 22 Aug 2012 08:59:20 +0200 [thread overview]
Message-ID: <cover.1345618760.git.n.voss@weinmann.de> (raw)
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
WARNING: multiple messages have this Message-ID (diff)
From: Nikolaus Voss <n.voss@weinmann.de>
To: linux-arm-kernel@lists.infradead.org,
linux-kernel@vger.kernel.org, linux-i2c@vger.kernel.org
Cc: nicolas.ferre@atmel.com, ben-linux@fluff.org, balbi@ti.com,
h.feurstein@gmail.com, rmallon@gmail.com, adrian.yanes@aalto.fi,
ludovic.desroches@atmel.com, carsten.behling@garz-fricke.com
Subject: [PATCH v11 0/4] AT91: replace old i2c-at91.c TWI driver
Date: Wed, 22 Aug 2012 08:59:20 +0200 [thread overview]
Message-ID: <cover.1345618760.git.n.voss@weinmann.de> (raw)
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
next reply other threads:[~2012-08-22 6:59 UTC|newest]
Thread overview: 50+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-08-22 6:59 Nikolaus Voss [this message]
2012-08-22 6:59 ` [PATCH v11 0/4] AT91: replace old i2c-at91.c TWI driver Nikolaus Voss
[not found] ` <cover.1345618760.git.n.voss-+umVssTZoCsb1SvskN2V4Q@public.gmane.org>
2011-11-08 10:49 ` [PATCH v11 1/4] drivers/i2c/busses/i2c-at91.c: remove old polling driver Nikolaus Voss
2011-11-08 10:49 ` Nikolaus Voss
2011-11-08 10:49 ` [PATCH v11 3/4] drivers/i2c/busses/i2c-at91.c: add new driver Nikolaus Voss
2011-11-08 10:49 ` Nikolaus Voss
2012-08-27 10:16 ` ludovic.desroches
2012-08-27 10:16 ` ludovic.desroches
2012-08-27 10:40 ` Yanes Martinez Adrian
2012-08-27 10:40 ` Yanes Martinez Adrian
2012-08-27 12:04 ` ludovic.desroches
2012-08-27 12:04 ` ludovic.desroches
2012-08-27 12:45 ` Yanes Martinez Adrian
2012-08-27 12:45 ` Yanes Martinez Adrian
[not found] ` <BC0F374A1C27184AB96177CDFEC2F54225ECD36E-rZDk5e4OVTsRAxgRyUl6SBEi2Xg3O0b1@public.gmane.org>
2012-08-27 13:32 ` Voss, Nikolaus
2012-08-27 13:32 ` Voss, Nikolaus
2012-08-27 13:32 ` Voss, Nikolaus
2012-08-27 14:00 ` ludovic.desroches
2012-08-27 14:00 ` ludovic.desroches
2012-08-27 14:29 ` Voss, Nikolaus
2012-08-27 14:29 ` Voss, Nikolaus
2012-08-27 14:29 ` Voss, Nikolaus
2012-09-11 8:26 ` Nicolas Ferre
2012-09-11 8:26 ` Nicolas Ferre
[not found] ` <504EF5BF.2090404-AIFe0yeh4nAAvxtiuMwx3w@public.gmane.org>
2012-09-11 22:13 ` Wolfram Sang
2012-09-11 22:13 ` Wolfram Sang
2012-09-11 22:13 ` Wolfram Sang
2012-08-30 7:35 ` ludovic.desroches
2012-08-30 7:35 ` ludovic.desroches
2012-08-28 15:10 ` ludovic.desroches
2012-08-28 15:10 ` ludovic.desroches
2012-08-28 15:32 ` Voss, Nikolaus
2012-08-28 15:32 ` Voss, Nikolaus
2011-11-08 11:09 ` [PATCH v11 2/4] Replace clk_lookup.con_id with clk_lookup.dev_id entries for twi clk Nikolaus Voss
2011-11-08 11:09 ` Nikolaus Voss
2011-11-08 11:11 ` [PATCH v11 4/4] G45 TWI: remove open drain setting for twi function gpios Nikolaus Voss
2011-11-08 11:11 ` Nikolaus Voss
2012-08-27 10:24 ` ludovic.desroches
2012-08-27 10:24 ` ludovic.desroches
2012-08-27 13:22 ` Voss, Nikolaus
2012-08-27 13:22 ` Voss, Nikolaus
2012-08-27 13:27 ` ludovic.desroches
2012-08-27 13:27 ` ludovic.desroches
-- strict thread matches above, loose matches on Subject: below --
2012-08-29 7:28 [PATCH v11 0/4] AT91: replace old i2c-at91.c TWI driver Nikolaus Voss
2012-08-29 7:28 ` Nikolaus Voss
2012-08-29 12:06 ` ludovic.desroches
2012-08-29 12:06 ` ludovic.desroches
[not found] ` <cover.1346225321.git.n.voss-+umVssTZoCsb1SvskN2V4Q@public.gmane.org>
2012-09-12 7:59 ` Nicolas Ferre
2012-09-12 7:59 ` Nicolas Ferre
2012-09-12 7:59 ` Nicolas Ferre
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