On Thu, 5 Jun 2014 09:20:08 +0100, Lee Jones <lee.jones@xxxxxxxxxx> wrote: > On Thu, 05 Jun 2014, Mika Westerberg wrote: > > On Wed, Jun 04, 2014 at 02:28:20PM +0100, Lee Jones wrote: > > > On Wed, 04 Jun 2014, Mika Westerberg wrote: > > > > On Wed, Jun 04, 2014 at 02:37:42PM +0200, Rafael J. Wysocki wrote: > > > > > On Wednesday, June 04, 2014 01:09:56 PM Lee Jones wrote: > > > > > > Currently this is a helper function for the I2C subsystem to aid the > > > > > > matching of non-standard compatible strings and devices which use DT > > > > > > and/or ACPI, but do not supply any nodes (see: [1] Method 4). However, > > > > > > it has been made more generic as it can be used to only make one call > > > > > > for drivers which support any mixture of OF, ACPI and/or I2C matching. > > > > > > > > > > > > The initial aim is for of_match_device() to be replaced by this call > > > > > > in all I2C device drivers. > > > > > > > > > > > > [1] Documentation/i2c/instantiating-devices > > > > > > > > > > > > Signed-off-by: Lee Jones <lee.jones@xxxxxxxxxx> > > > > > > > > > > Mika, can you please have a look at this, please? > > > > > > > > I don't see any fundamental problems with this wrt. ACPI. > > > > > > > > That said, I find it kind of weird to have generic function that then > > > > has knowledge of how different buses do their matching. > > > > > > > > I would rather see something like firmware_device_match(dev) that goes > > > > and matches from DT/ACPI and leave bus specific match to happen internal > > > > to that bus. > > > > > > Unfortunately that completely defeats the object of the patch. When a > > > of_match_device() is invoked it solely looks up devices based on OF > > > matching, but I2C is special in that devices can be registered via > > > sysfs, thus will no have device node. If of_match_device() is called > > > in one of these instances it will fail. The idea of this patch is to > > > generify the matching into something does has the knowledge to firstly > > > attempt a traditional match, and if that fails will fall back to a > > > special i2c_{of,acpi}_match_device() which knows how to deal with > > > node-less registration. > > > > OK, then but since this is now I2C specific, why call it device_match() > > instead of something like i2c_device_match()? Or do you have plans to > > So in an early incarnation of the patch I did just that, and it might > not actually be such a bad idea still - I'm open to other people's > opinions on this. > > > add there more knowledge about other buses like SPI and PCI to name few? > > ... but yes, this is the new idea - that it can be expanded as required. The whole point of this series is to deal with a special use case of i2c that we don't need to support for the other bus types. We're having to just through special hoops to make it work and I don't want to expand it to other bus types if at all possible. g. > -- > Lee Jones > Linaro STMicroelectronics Landing Team Lead > Linaro.org â?? Open source software for ARM SoCs > Follow Linaro: Facebook | Twitter | Blog -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html