* Paul Walmsley <paul@xxxxxxxxx> [090817 13:06]:
> Hello Russell,
>
> On Mon, 17 Aug 2009, Russell King - ARM Linux wrote:
>
> > On Mon, Aug 17, 2009 at 03:14:45AM -0600, Paul Walmsley wrote:
> > > What it does remove is the need for internal core code to fake up a struct
> > > device simply to access a clock. It also allows us to harmonize the
> > > clock names, used internally in core code, with the hardware reality,
> > > which uses unique names to identify clocks.
> >
> > That problem is already solved. clk_get_sys()
>
> That solves the first problem, but not the second. Is there some reason
> that OMAP core code (aside from the clkdev mapping structures in
> mach-omap2/clock*.c) should know, or care, whether a platform device name
> is bound to that clock?
>
> On OMAP, we have uniquely-named clock lines in the technical
> documentation. It is possible that other platforms don't have this. But
> for us, I'd submit that it makes more sense for internal core code to
> fetch a clock documented as "MMC1_FCLK" with:
>
> c = omap_clk_get_by_name("mmc1_fck");
>
> rather than:
>
> c = clk_get_sys("mmci-omap-hs.0", "ick");
>
> (* ideally, of course, we'd use "mmc1_fclk" rather than "mmc1_fck", this
> is a legacy issue that has been left for a future patch.)
>
> As a side benefit, it also makes our clock debugfs setup easier, so a
> clock can be identified in the path as simply
> /debugfs/clock/.../mmc1_fck/, rather than something like
> /debugfs/clock/.../mmci-omap-hs.0-mmc1_fck/ or
> /debugfs/clock/.../mmci-omap-hs.0/mmc1_fck.
>
> Thoughts?
I guess if we wanted to do this in a generic way, we could have
clkdev_get_hw_name() in arch/arm/common/clkdev.c. Then we could
have struct omap_clk contain the hardware clock name.
But then we're wasting memory and duplicating parts of the names,
so I don't think that it would be any better solution compared to
renaming the clocks like you're doing.
Tony
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