Dear Rob Herring, On Thu, 15 May 2014 08:35:18 -0500, Rob Herring wrote: > > diff --git a/Documentation/devicetree/bindings/arm/l2cc.txt b/Documentation/devicetree/bindings/arm/l2cc.txt > > index b513cb8..077d837 100644 > > --- a/Documentation/devicetree/bindings/arm/l2cc.txt > > +++ b/Documentation/devicetree/bindings/arm/l2cc.txt > > @@ -40,6 +40,9 @@ Optional properties: > > - arm,filter-ranges : <start length> Starting address and length of window to > > filter. Addresses in the filter window are directed to the M1 port. Other > > addresses will go to the M0 port. > > +- dma-coherent : indicates that the system is operating in an hardware > > + I/O coherent mode. Valid only when the arm,pl310-cache compatible > > + string is used. > > I don't like this because it creates 2 different meanings for > dma-coherent. dma-coherent is meant to be a property of DMA masters > and that is not really what the L2 is. Perhaps "arm,io-coherent" or > "pl310-io-coherent" instead. Yes, indeed, makes sense. > > +/* > > + * PL310 operations used on I/O coherent systems. Theoretically, no > > + * outer cache operations would be needed, except that for secondary > > + * processors bring up, a few cache maintenance operations are needed > > + * because secondary processors are not directly coherent with the L2 > > + * cache when they start up. > > + */ > > +static const struct l2x0_of_data pl310_coherent_data = { > > + .setup = pl310_of_setup, > > + .save = pl310_save, > > + .outer_cache = { > > + .resume = pl310_resume, > > + .inv_range = l2x0_inv_range, > > + .clean_range = l2x0_clean_range, > > + .flush_range = l2x0_flush_range, > > + .flush_all = l2x0_flush_all, > > + .inv_all = l2x0_inv_all, > > + }, > > +}; > > Why do you need a whole new struct. Can't you just null out the sync ptr? Because originally Catalin suggested a separate compatible string, and therefore a separate set of operations. But you're right, with the move to just an additional property, nullify-ing the sync pointer is much simpler. Thanks, Thomas -- Thomas Petazzoni, CTO, Free Electrons Embedded Linux, Kernel and Android engineering http://free-electrons.com -- 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