On Wed, Jun 12, 2013 at 02:38:12PM +0200, Arnd Bergmann wrote: > On Wednesday 12 June 2013, Maxime Ripard wrote: > > The Marvell and Allwinner controllers share the exact same logic (which > > is definitely not trivial), based on a finite state machine that > > triggers interrupts at each change of state, each state being a state in > > the I2C protocol (like address sent, data received with an ACK, etc.). > > > > The weird thing is that the only difference between the two controllers > > is the register offsets, and that's it. The state numbers, bit index, > > etc, are exactly the same. > > Ok, cool. Great someone noticed! Kudos to Wolfram :) > > So yes, I think they both licensed the same IP. > > I wonder if it's the Mentor Graphics Inventra mi2c block, which > would make sense given that Allwinner also uses musb. The only datasheet or manual I have been able to find is http://www.mentor.com/products/ip/peripheral/ip_interface/upload/mi2c_pd.pdf which doesn't give a lot of details. Yet, from what is shown and explained in the second page, it looks like it could be this IP. Maxime -- Maxime Ripard, Free Electrons Embedded Linux, Kernel and Android engineering http://free-electrons.com -- To unsubscribe from this list: send the line "unsubscribe linux-i2c" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
