I2C bus timeout property

I2C bus timeout property

[Roland Stigge]

Hi,

as you may already have noticed, in the ARM devicetree conversion, we
are wondering how to handle the I2C bus timeout property.

There is already an "fsl,timeout" property, but introducing several
driver or vendor specific properties for basically the same kind of
property doesn't make much sense. We already searched devicetree.org and
EPAPR but without finding timeout properties.

I propose using a generic "timeout" property with newly supported i2c
busses, holding a bus timeout value in microseconds (as already done
with "fsl,timeout".

What do you think?

Thanks in advance,

Roland

Re: I2C bus timeout property

[Wolfram Sang]

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On Fri, Apr 20, 2012 at 11:41:15AM +0200, Roland Stigge wrote:
> Hi,
> 
> as you may already have noticed, in the ARM devicetree conversion, we
> are wondering how to handle the I2C bus timeout property.
> 
> There is already an "fsl,timeout" property, but introducing several
> driver or vendor specific properties for basically the same kind of
> property doesn't make much sense. We already searched devicetree.org and
> EPAPR but without finding timeout properties.
> 
> I propose using a generic "timeout" property with newly supported i2c
> busses, holding a bus timeout value in microseconds (as already done
> with "fsl,timeout".

There is also "i2c-gpio,timeout-ms" already.

> What do you think?

Basically same question goes for "slave-addr". Since I2C is
multi-master, an I2C controller may also be slave (not that we support
that in the I2C core yet, but drivers could have that implemented on
their own). We have "samsung,i2c-slave-addr" already.

Regards,

   Wolfram

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

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