On Tue, May 03, 2016 at 03:45:43PM -0300, Erico Nunes wrote: > i2c-dev had never moved away from the older register_chrdev interface to > implement its char device registration. The register_chrdev API has the > limitation of enabling only up to 256 i2c-dev busses to exist. > > Large platforms with lots of i2c devices (i.e. pluggable transceivers) > with dedicated busses may have to exceed that limit. > In particular, there are also platforms making use of the i2c bus > multiplexing API, which instantiates a virtual bus for each possible > multiplexed selection. > > This patch removes the register_chrdev usage and replaces it with the > less old cdev API, which takes away the 256 i2c-dev bus limitation. > It should not have any other impact for i2c bus drivers or user space. > > This patch has been tested on qemu x86 and qemu powerpc platforms with > the aid of a module which adds and removes 5000 virtual i2c busses, as > well as validated on an existing powerpc hardware platform which makes > use of the i2c bus multiplexing API. > i2c-dev busses with device minor numbers larger than 256 have also been > validated to work with the existing i2c-tools. > > Signed-off-by: Erico Nunes <erico.nunes@xxxxxxxxxxxxxx> Applied to for-next, thanks! I'll try to still get it into v4.7.
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