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i2c: at91: add new driver

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This driver has the following properties compared to the old driver:
1. Support for multiple interfaces.
2. Interrupt driven I/O as opposed to polling/busy waiting.
3. Support for _one_ repeated start (Sr) condition, which is enough
   for most real-world applications including all SMBus transfer types.
   (The hardware does not support issuing arbitrary Sr conditions on the
    bus.)

testing: SoC: at91sam9g45
	 - BQ20Z80 battery SMBus client.
	 - on a 2.6.38 kernel with several i2c clients (temp-sensor,
	   audio-codec, touchscreen-controller, w1-bridge, io-expanders)

Signed-off-by: Nikolaus Voss <n.voss@weinmann.de>
Reviewed-by: Felipe Balbi <balbi@ti.com>
Tested-by: Hubert Feurstein <h.feurstein@gmail.com>
Tested-by: Ludovic Desroches <ludovic.desroches@atmel.com>
Reviewed-by: Nicolas Ferre <nicolas.ferre@atmel.com>

[wsa: squashed with the following patches from Ludovic to have some flaws
fixed:
        i2c: at91: use managed resources
        i2c: at91: add warning about transmission issues for some devices
        i2c: at91: use an id table for SoC dependent parameters
]

Signed-off-by: Ludovic Desroches <ludovic.desroches@atmel.com>
Signed-off-by: Wolfram Sang <w.sang@pengutronix.de>
This commit is contained in:
Nikolaus Voss
2011-11-08 11:49:46 +01:00
committed by Wolfram Sang
parent a879e9c34b
commit fac368a040
15 changed files with 545 additions and 22 deletions
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2
arch/arm/mach-at91/at91sam9rl_devices.c
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@@ -346,7 +346,7 @@ static struct resource twi_resources[] = {
};
static struct platform_device at91sam9rl_twi_device = {
.name = "at91_i2c",
.name = "i2c-at91sam9g20",
.id = -1,
.resource = twi_resources,
.num_resources = ARRAY_SIZE(twi_resources),