I2c slave support
in [Kernel]
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From: Jack on 28 May 2010 04:20 Extremely sorry, May be I left the subject field blank. On Fri, May 28, 2010 at 10:39 AM, Justin P. Mattock <justinmattock(a)gmail.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(a)gmail.com> wrote: > > > On Thu, May 27, 2010 at 1:05 PM, linux_newbie good > <mylinux.list(a)gmail.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 > > > > -- > To unsubscribe from this list: send the line "unsubscribe linux-kernel" in > the body of a message to majordomo(a)vger.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html > Please read the FAQ at http://www.tux.org/lkml/ > > > > 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(a)gmail.com > (is it me or am I seeing things?) > > Justin P. Mattock > -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo(a)vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/ |