From: Jebediah Huang <jebediah.huang@gmail.com>
To: Daniel Mack <daniel@caiaq.de>
Cc: Eric Miao <eric.y.miao@gmail.com>,
linux-arm-kernel@lists.infradead.org,
linux-input@vger.kernel.org
Subject: Re: Using PXA arm board with MAX7319 GPIO expander input
Date: Mon, 8 Feb 2010 15:56:10 +0800 [thread overview]
Message-ID: <bf0eec9a1002072356x443c729fpa1c4a8c72209dfec@mail.gmail.com> (raw)
In-Reply-To: <20100208073612.GV28972@buzzloop.caiaq.de>
On Mon, Feb 8, 2010 at 3:36 PM, Daniel Mack <daniel@caiaq.de> wrote:
> On Mon, Feb 08, 2010 at 03:02:14PM +0800, Jebediah Huang wrote:
>>
>> output if max732x enabled is:
>> # ./i2ctest
>> [ 184.070025] i2c: error: exhausted retries
>> fd=3
>> t=-1
>> [ 184.074256] i2c: msg_num: 0 msg_idx: -2000 msg_ptr: 0
>> [ 184.080428] i2c: ICR: 000007e0 ISR: 00000002
>> [ 184.080444] i2c: log: [00000006:00000000] [00000006:00000000]
>> [00000006:00000000] [00000006:00000000] [00000006:00000000]
>> [00000006:00000000] [00000006:00
>> 000000] [00000006:00000000] [00000006:00000000] [00000006:00000000]
>> [00000006:00000000] [00000007:00000000] [00000447:000007e0]
>> t=-1
>
> How do you enable/disable the chip? As Eric said, the error above
> indicates an eletrical issue with the bus.
I disable by doing menuconfig and disable max732x:
# CONFIG_GPIO_MAX732X is not set
>
>> disable max732x is:
>> # ./i2ctest no button pressed
>
> What are you testing without the chip?
>
I am testing the I2C from i2ctest application using I2C_PXA.
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next prev parent reply other threads:[~2010-02-08 7:56 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-02-08 5:44 Using PXA arm board with MAX7319 GPIO expander input Jebediah Huang
2010-02-08 6:02 ` Eric Miao
2010-02-08 7:02 ` Jebediah Huang
2010-02-08 7:36 ` Daniel Mack
2010-02-08 7:56 ` Jebediah Huang [this message]
2010-02-08 11:08 ` Jebediah Huang
2010-02-08 11:33 ` Daniel Mack
2010-02-08 12:32 ` Marc Zyngier
2010-02-08 13:04 ` Daniel Mack
2010-02-09 1:05 ` Eric Miao
2010-02-09 7:39 ` Marc Zyngier
2010-02-09 8:19 ` Eric Miao
2010-02-09 10:22 ` Marc Zyngier
2010-02-09 1:07 ` Eric Miao
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