* I2C host adapter slave support
@ 2008-01-04 14:55 Chandra shekhar
[not found] ` <200801041455.m04EtNnG003793-5Y3xciNRgV4YBkLn7j66hwC/G2K4zDHf@public.gmane.org>
0 siblings, 1 reply; 4+ messages in thread
From: Chandra shekhar @ 2008-01-04 14:55 UTC (permalink / raw)
To: i2c-GZX6beZjE8VD60Wz+7aTrA
Hi,
I am implementing i2c slave mode transfers, and found out that there isn't really any support in the subsystem for this.
Also I did not find any discussions regarding this in i2c mailing list.
Are there any discussions or plans about implementing host adapter slave support in i2c subsytem?
Regards,
Chandra Shekhar
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: I2C host adapter slave support
[not found] ` <200801041455.m04EtNnG003793-5Y3xciNRgV4YBkLn7j66hwC/G2K4zDHf@public.gmane.org>
@ 2008-01-04 23:13 ` Nishanth Menon
[not found] ` <477EBD8D.9000807-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
0 siblings, 1 reply; 4+ messages in thread
From: Nishanth Menon @ 2008-01-04 23:13 UTC (permalink / raw)
To: Chandra shekhar; +Cc: i2c-GZX6beZjE8VD60Wz+7aTrA
Chandra shekhar wrote:
> I am implementing i2c slave mode transfers, and found out that there isn't really any support in the subsystem for this.
> Also I did not find any discussions regarding this in i2c mailing list.
> Are there any discussions or plans about implementing host adapter slave support in i2c subsytem?
>
Not true on many counts: google is a good search engine :):
http://www.google.com/search?hl=en&q=i2c+slave+support+linux
one thread of interest is:
http://lists.lm-sensors.org/pipermail/i2c/2007-April/001027.html
Quote">/ > Russell King has added I2C slave support at least for PXA...
/I'm curious. How does it work? Does this means that there is no need
for cooperation from i2c-core to implement I2C slave support in I2C bus
drivers? Or is i2c-pxa implementing things which should be moved to
i2c-core? This discussion probably belongs to a different thread though,
I doesn't seem to be related to bus speed issues at all. "
Finally see the slave implementation here:
http://www.gelato.unsw.edu.au/lxr/source/drivers/i2c/busses/i2c-pxa.c
Regards,
Nishanth Menon
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: I2C host adapter slave support
[not found] ` <477EBD8D.9000807-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
@ 2008-01-05 17:13 ` Chandra shekhar
[not found] ` <200801051713.m05HDElg011590-5Y3xciNRgV4YBkLn7j66hwC/G2K4zDHf@public.gmane.org>
0 siblings, 1 reply; 4+ messages in thread
From: Chandra shekhar @ 2008-01-05 17:13 UTC (permalink / raw)
To: 'Nishanth Menon'; +Cc: i2c-GZX6beZjE8VD60Wz+7aTrA
> Chandra shekhar wrote:
> > I am implementing i2c slave mode transfers, and found out
> that there isn't really any support in the subsystem for this.
> > Also I did not find any discussions regarding this in i2c
> mailing list.
> > Are there any discussions or plans about implementing host
> adapter slave support in i2c subsytem?
> >
> one thread of interest is:
> http://lists.lm-sensors.org/pipermail/i2c/2007-April/001027.html
This is more related to opearting speed for i2c devices sitting on a common bus.
> Quote">/ > Russell King has added I2C slave support at least
> for PXA...
> /I'm curious. How does it work? Does this means that there is
> no need for cooperation from i2c-core to implement I2C slave
> support in I2C bus drivers? Or is i2c-pxa implementing things
> which should be moved to i2c-core?
Precisely, this is my question. If we were to support slave mode there should be
Some callback or hooks to trigger upper layer app. after receive operations, which
Ideally should be part of i2c-core I think.
I am yet to look at i2c-pxa code.
This discussion probably
> belongs to a different thread though, I doesn't seem to be
> related to bus speed issues at all. "
>
> Finally see the slave implementation here:
> http://www.gelato.unsw.edu.au/lxr/source/drivers/i2c/busses/i2c-pxa.c
> Regards,
> Nishanth Menon
>
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: I2C host adapter slave support
[not found] ` <200801051713.m05HDElg011590-5Y3xciNRgV4YBkLn7j66hwC/G2K4zDHf@public.gmane.org>
@ 2008-01-05 17:41 ` Nishanth Menon
0 siblings, 0 replies; 4+ messages in thread
From: Nishanth Menon @ 2008-01-05 17:41 UTC (permalink / raw)
To: Chandra shekhar; +Cc: i2c-GZX6beZjE8VD60Wz+7aTrA
Chandra shekhar wrote:
>
>
>> one thread of interest is:
>> http://lists.lm-sensors.org/pipermail/i2c/2007-April/001027.html
>>
>
> This is more related to opearting speed for i2c devices sitting on a common bus.
>
>
True, there is a side discussion on slave support
> Precisely, this is my question. If we were to support slave mode there should be
> Some callback or hooks to trigger upper layer app. after receive operations, which
> Ideally should be part of i2c-core I think.
> I am yet to look at i2c-pxa code.
You have not been reading too detailed in to the thread and not looked
at the code:
"http://lists.lm-sensors.org/pipermail/i2c/2007-April/001049.html:
:) this driver is compile time slave/master. Now, I have an i2c
controller which is capable of master /slave - ofcourse only one at a
time for one controller instance. But, I have n instances of the same.
Each capable of being slave or master based on board. The framework wont
let me do it unless I create two drivers - one for slave and other for
master - define separate adapters for them.. Not exactly efficient, but
could work. Can we do this with a cleaner support from i2c-core(like
able to write a single adapter driver which can be used as both
slave/master based ofcourse on board defns)? Maybe a seperate thread of
discussion?
"
So I guess this is that thread of discussion.
Gist:
a) you can implement i2c slave adapter support today with the existing
framework
b) my conjecture at the time of discussion was that "to have the same
driver to handle master and slave in a build might need further changes"
Regards,
Nishanth Menon
Regards,
Nishanth Menon
^ permalink raw reply [flat|nested] 4+ messages in thread
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2008-01-04 14:55 I2C host adapter slave support Chandra shekhar
[not found] ` <200801041455.m04EtNnG003793-5Y3xciNRgV4YBkLn7j66hwC/G2K4zDHf@public.gmane.org>
2008-01-04 23:13 ` Nishanth Menon
[not found] ` <477EBD8D.9000807-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
2008-01-05 17:13 ` Chandra shekhar
[not found] ` <200801051713.m05HDElg011590-5Y3xciNRgV4YBkLn7j66hwC/G2K4zDHf@public.gmane.org>
2008-01-05 17:41 ` Nishanth Menon
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