On Thu, Jul 26, 2018 at 11:04:24AM +0200, Alexander Sverdlin wrote: > On 25/07/18 19:06, Mark Brown wrote: > > this or if we shouldn't instead be looking at improving the driver to > > work better in systems with limited channels, for example by only > > claiming the channels when it's active (since it can fall back to PIO if > > it doesn't get them). That might be too heavyweight though, possibly > yes, this is an option as well, but at the time we need to take this decision > the bus scan has not yet been performed. We could scan all the devices in > the DT and check if any of them requires DMA. This would mean, that > probe() of the PL022 driver will include similar code to the bus scan > that anyway will happen later just to take the decision on DMA usage. > But I'm fine with that. If this sounds better than new boolean DT binding, > I'll send another patch. I'm not 100% clear I follow what you mean by bus scan here but I *think* that sounds about right. The channel request/release could be factored out into helper functions to minimize duplication.
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