Messages in this thread | | | Date | Wed, 28 Apr 2004 10:13:57 +0200 | From | stefan.eletzhofer@eletztri ... | Subject | Re: i2c_get_client() missing? |
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On Tue, Apr 27, 2004 at 07:21:19PM +0100, Russell King wrote: > On Tue, Apr 27, 2004 at 08:35:12AM -0700, Greg KH wrote: > > Where do you need to access it from? Why do all of the current drivers > > not need it? > > The "traditional Linux" i2c model is one where the i2c bus is local to > the card, so the overall driver knows where the bus is, and what devices > to expect, and it's all nicely encapsulated. > > The variant on that is the i2c sensor stuff, where the individual i2c > bus device drivers export data to userspace themselves. > > However, there's another class, where the i2c bus contains things like > RTC and system control stuff, which can be found on embedded devices. > Such an i2c bus is often shared between multiple parts of the system, > and lumping them all together into one massive driver does not make > sense.
Thats exactly what I tried to say with my other post. Thanks for spelling it more precisely.
> > For instance, one platform I have here has an i2c bus with a RTC on, > and optionally a couple of EEPROMs giving the dimentions of the memory > on a couple of expansion boards. It doesn't make sense to lump the > RTC code along side the memory controller configuration code, along > with the i2c bus driver.
Again, exatly what I thought when I split up I2C RTC chip access and higher level RTC device handling stuff.
> > I2C is much much more than sensors and graphics capture chips.
Definitely.
> -- > Russell King > Linux kernel 2.6 ARM Linux - http://www.arm.linux.org.uk/ > maintainer of: 2.6 PCMCIA - http://pcmcia.arm.linux.org.uk/ > 2.6 Serial core > - > To unsubscribe from this list: send the line "unsubscribe linux-kernel" in > the body of a message to majordomo@vger.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html > Please read the FAQ at http://www.tux.org/lkml/
-- Eletztrick Computing - Customized Linux Development Stefan Eletzhofer, Marktstrasse 43, DE-88214 Ravensburg http://www.eletztrick.de - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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