linux-kernel - Re: [PATCH] add hardware I2C support for ARM IMX23

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Date:	Wed, 28 Nov 2012 18:09:07 +0100
From:	Wolfram Sang <w.sang@...gutronix.de>
To:	Sander van Ginkel <sander@...-ginkel.eu>
Cc:	linux-kernel@...r.kernel.org, kernel@...gutronix.de,
	shawn.guo@...aro.org, linux-arm-kernel@...ts.infradead.org,
	linux-i2c@...r.kernel.org
Subject: Re: [PATCH] add hardware I2C support for ARM IMX23

Hi,

(adding the i2c list)

On Wed, Nov 28, 2012 at 05:44:49PM +0100, Sander van Ginkel wrote:
> tested with:
> CONFIG_I2C_MXS=m
> CONFIG_I2C_MXS=y
> 
> in combination with CONFIG_GPIO_MXS enabled and disabled
> 
> used kernels: 3.6 and 3.7.0-rc6
> 
> My I2C slave is a PCF8575 i/o expander with some LEDs at the output.
> These are controlled through sysfs.

Thanks, this is useful info.

> Just tested with "i2cdetc -y -r 0" that crashes with  "BUG: soft
> lockup - CPU#0 stuck for 22s!"
> according to the docs (IMX23RM.pdf) the interrupts for I2C are 26
> and 27 that why I assigned these two in the dts.

You might want to try my for-next branch or wait for 3.8-rc1, maybe the
DMA termination patch helps? Also enabling I2C debug messages is
probably worth it.

Regards,

   Wolfram

-- 
Pengutronix e.K.                           | Wolfram Sang                |
Industrial Linux Solutions                 | http://www.pengutronix.de/  |

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