On Tue, Apr 21, 2020 at 06:42:17PM +0200, Philipp Rossak wrote: > Hi, > > On 21.04.20 13:21, Maxime Ripard wrote: > > Hi, > > > > On Tue, Apr 21, 2020 at 11:57:33AM +0200, Philipp Rossak wrote: > > > On 20.04.20 09:38, Maxime Ripard wrote: > > > > Hi, > > > > > > > > On Fri, Apr 17, 2020 at 02:09:06PM +0200, Philipp Rossak wrote: > > > > > > > I'm a bit skeptical on that one since it doesn't even list the > > > > > > > interrupts connected to the GPU that the binding mandates. > > > > > > > > > > > > I think he left it out for a future update. > > > > > > But best he comments himself. > > > > > > > > > > I'm currently working on those bindings. They are now 90% done, but they are > > > > > not finished till now. Currently there is some mainline support missing to > > > > > add the full binding. The A83T and also the A31/A31s have a GPU Power Off > > > > > Gating Register in the R_PRCM module, that is not supported right now in > > > > > Mainline. The Register need to be written when the GPU is powered on and > > > > > off. > > > > > > > > > > @Maxime: I totally agree on your point that a demo needs to be provided > > > > > before the related DTS patches should be provided. That's the reason why I > > > > > added the gpu placeholder patches. > > > > > Do you have an idea how a driver for the R_PRCM stuff can look like? I'm not > > > > > that experienced with the clock driver framework. > > > > > > > > It looks like a power-domain to me, so you'd rather plug that into the genpd > > > > framework. > > > > > > I had a look on genpd and I'm not really sure if that fits. > > > > > > It is basically some bit that verify that the clocks should be enabled or > > > disabled. > > > > No, it can do much more than that. It's a framework to control the SoCs power > > domains, so clocks might be a part of it, but most of the time it's going to be > > about powering up a particular device. > > > So I think I've found now the right piece of documentation and a driver that > implements something similar [1]. > > So I will write a similar driver like linked above that only sets the right > bits for A83T and A31/A31s. > Do you think this is the right approach? That sounds about right yes Maxime
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