On Tue, 1 Oct 2013 13:00:54 -0700 Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> wrote: > On Tue, Oct 01, 2013 at 01:38:31PM -0500, Kim Phillips wrote: > > Hi, > > > > Santosh and I are having a problem figuring out how to enable binding > > (and re-binding) platform devices to a platform VFIO driver (see > > Antonis' WIP: [1]) in an upstream-acceptable manner. > > > > Binding platform drivers currently depends on a string match in the > > device node's compatible entry. On an arndale, one can currently > > rebind the same device to the same driver like so: > > > > echo 12ce0000.i2c > /sys/bus/platform/drivers/s3c-i2c/12ce0000.i2c/driver/unbind > > echo 12ce0000.i2c > /sys/bus/platform/drivers/s3c-i2c/bind > > > > And one can bind it to the vfio-dt driver, as Antonis instructs, by > > appending a 'vfio-dt' string to the device tree compatible entry for > > the device. Then this would work: > > > > echo 12ce0000.i2c > /sys/bus/platform/drivers/s3c-i2c/12ce0000.i2c/driver/unbind > > echo 12ce0000.i2c > /sys/bus/platform/drivers/vfio-dt/bind > > > > Consequently, the hack patch below [2] allows any platform device to be > > bound to the vfio-dt driver, without making changes to the device > > tree. It's a hack because I don't see having any driver name specific > > code in drivers/base/bus.c being upstream acceptable. > > You are correct. > > What is wrong with just doing the above unbind/bind things through > sysfs, that is what it is there for, right? The bind fails because the compatible string in the device tree doesn't match that of the VFIO platform driver, so driver_match_device always returns false. Kim -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
