Re: [PATCH v5 3/3] ARM: dts: igep00x0: add wl18xx bindings

Arnd Bergmann
2015-03-10T19:49:18Z

On Tuesday 10 March 2015 10:35:50 Tony Lindgren wrote:
> * Eliad Peller <eliad-Ix1uc/W3ht7QT0dZR+AlfA@public.gmane.org> [150310 10:01]:
> > i'm really not familiar with the common clock framework, but there
> > still doesn't seem to be a way to determine whether a clock is XTAL or
> > not (which is what Luca's patch was about). should we use compatible
> > flag in such case? i'm not sure it sounds right.
> >
> > anyway, i'd really prefer, if possible, starting with the wl18xx
> > bindings, and defer the wl12xx complications to later on.
> > (i also need to find some wl12xx card in order to actually test the
> > patches once i'll have them...)
> >
> > we do have to make sure these wl18xx bindings are future-compatible
> > with the wl12xx ones, but i think the current bindings are pretty much
> > standard (and are actually a subset of the bindings needed by wl12xx),
> > so it should be fine.
>
> Well how about add just the parsing of the clock and assume it's always
> WL12XX_REFCLOCK_38 for now as that's the only thing we're currently
> using. Then we can add a property or compatible value if using something
> else as needed.
>

We have two exceptions:

static void __init omap3_zoom_legacy_init(void)
{
legacy_init_wl12xx(WL12XX_REFCLOCK_26, 0, 162);
}

static void __init omap4_sdp_legacy_init(void)
{
legacy_init_wl12xx(WL12XX_REFCLOCK_26,
WL12XX_TCXOCLOCK_26, 53);
}

Where do those clocks come from? If these are always fixed-rate
clocks coming from an external clock provider, using a separate
compatible string in the clock provider would seem reasonable to
me, but we can do that once we have to: none of the machines
we support use an XTAL clock input.

Arnd
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