linux-kernel - Re: I2c slave support

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Message-ID: <AANLkTikrEE-7RzlhetBrF8RXNtPToGe-girXu4HfoNS4@mail.gmail.com>
Date:	Fri, 28 May 2010 13:44:51 +0530
From:	Jack <mylinux.list@...il.com>
To:	"Justin P. Mattock" <justinmattock@...il.com>
Cc:	Haojian Zhuang <haojian.zhuang@...il.com>,
	linux-kernel@...r.kernel.org
Subject: Re: I2c slave support

Extremely sorry, May be I left the subject field blank.

On Fri, May 28, 2010 at 10:39 AM, Justin P. Mattock
<justinmattock@...il.com> wrote:
> On 05/27/2010 10:01 PM, Jack wrote:
>
> Hi,
> Thanks,
>
> First solution needs additional GPIO pins, I have used all the pins.
> I'm going with the other solution, writing slave driver on the MIPS side.
> The MIPS provides an interrupt vector for the I2C bus.
>
> Regards,
> Jack
> .
>
>
> On Thu, May 27, 2010 at 11:25 AM, Haojian Zhuang
> <haojian.zhuang@...il.com> wrote:
>
>
> On Thu, May 27, 2010 at 1:05 PM, linux_newbie good
> <mylinux.list@...il.com> wrote:
>
>
> Hi,
>
> My board has a MIPS based Processor and a micro-controller.  The
> communication between these two interfaces is through an I2C bus. The
> Linux driver for my I2C controller (i mean the one in MIPS processor)
> has support for master transmitter and master receiver whereas I could
> not find support for slave TX and slave RX modes. Do I need to write
> my own functions for slave support? If so, what kind of changes need
> to be done, for slave mode support? Is there any other sample driver
> which can help ?
>
>
>
>
> Maybe you needn't write a slave I2C driver on MIPS side. It should
> based on your system requirement.
>
> I suggest the solution in below may be easier.
>
> ++++++++++++++                             ++++++++++++
> + MIPS (Master)  + -----> I2C -----------> + MCU (Slave)  +
> +                        +<----GPIO INT <----- +                     +
> ++++++++++++++                             ++++++++++++
>
> Since MIPS is master, it can read/write data from slave directly.
> While MCU want to contact with MIPS, it can trigger INT first. Then
> MIPS can query MCU and feed its required.
>
> Perhaps you may not choice this solution. You have to write slave
> driver on MIPS side and both master/slave driver on MCU side. You can
> refer to $LINUX/drivers/i2c/busses/i2c-pxa.c for reference. i2c-pxa
> driver supports both master and slave mode.
>
> Thanks
> Haojian
>
>
>
> --
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>
>
> change of subject: this morning xorg with their list was having
> issues with the subject line showing peoples e-mails
> and now I see something similar here.
> i.g. Re: mylinux.list@...il.com
> (is it me or am I seeing things?)
>
> Justin P. Mattock
>
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