Re: [PATCH 21/21] clk: ux500: Supply provider look-up functionalityto support Device Tree

From: Lee Jones
Date: Wed Jun 05 2013 - 04:05:50 EST

On Tue, 04 Jun 2013, Arnd Bergmann wrote:

> On Tuesday 04 June 2013, Linus Walleij wrote:
> > The whole thing is very different from other DT clock things
> > I've seen, usually you add a compatible node for each
> > clock type, and a node for each physical gate. But there
> > may be several ways to skin this cat...
> >
> Based on the IRC discussion we had, I would think that the "prcc" clocks
> would best be represented using multiple clock-cells since you can describe
> them easily a tuple of register index, bit number some way to distinguish
> the two types.
> The "prcmu" clocks are harder, and we probably need either a more verbose
> representation using one node per clock there, or have a single node
> for the entire prcmu and not bother to describe them in DT but hardcode
> everything in the source. The current patch does the latter, which is
> easier now but means we cannot simplify the code much in the future
> when we remove ATAGS boot support.

As already discussed, in the PRCMU case I'm going to make 'enum
prcmu_clock {' look like register PRCM_YYCLKEN0_MGT_SET as described
by the design specification, and use that as our indexer.

> I hope Mike can give some better insight to what his preferences are.
> Arnd

Lee Jones
Linaro ST-Ericsson Landing Team Lead â Open source software for ARM SoCs
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