* Eero Nurkkala <[email protected]> [090108 14:14]:
> >From clock34xx.h I find them having parents:
> (but of course I'm possibly talking about something else
> you're meaning =)
Yeah, the problem is caused by arch/arm/mach-omap2/mcbsp.c
registering custom clocks that have no parent.
Tony
>
>
> static struct clk mcbsp2_ick = {
> .name = "mcbsp_ick",
> .id = 2,
> .parent = &per_l4_ick,
> .prcm_mod = OMAP3430_PER_MOD,
> .enable_reg = CM_ICLKEN,
> .enable_bit = OMAP3430_EN_MCBSP2_SHIFT,
> .idlest_bit = OMAP3430_ST_MCBSP2_SHIFT,
> .flags = CLOCK_IN_OMAP343X | WAIT_READY,
> .clkdm = { .name = "per_clkdm" },
> .recalc = &followparent_recalc,
> };
>
> static const struct clksel mcbsp_234_clksel[] = {
> { .parent = &core_96m_fck, .rates = common_mcbsp_96m_rates },
> { .parent = &mcbsp_clks, .rates = common_mcbsp_mcbsp_rates },
> { .parent = NULL }
> };
>
> static struct clk mcbsp2_src_fck = {
> .name = "mcbsp_src_fck",
> .id = 2,
> .prcm_mod = CLK_REG_IN_SCM,
> .init = &omap2_init_clksel_parent,
> .clksel_reg = OMAP2_CONTROL_DEVCONF0,
> .clksel_mask = OMAP2_MCBSP2_CLKS_MASK,
> .clksel = mcbsp_234_clksel,
> .flags = CLOCK_IN_OMAP343X,
> .clkdm = { .name = "per_clkdm" },
> .recalc = &omap2_clksel_recalc,
> };
>
> static struct clk mcbsp2_fck = {
> .name = "mcbsp_fck",
> .id = 2,
> .parent = &mcbsp2_src_fck,
> .prcm_mod = OMAP3430_PER_MOD,
> .enable_reg = CM_FCLKEN,
> .enable_bit = OMAP3430_EN_MCBSP2_SHIFT,
> .idlest_bit = OMAP3430_ST_MCBSP2_SHIFT,
> .flags = CLOCK_IN_OMAP343X | WAIT_READY,
> .clkdm = { .name = "per_clkdm" },
> .recalc = &omap2_clksel_recalc,
> };
>
> On Thu, 2009-01-08 at 13:12 +0200, ext Tony Lindgren wrote:
> > * Eero Nurkkala <[email protected]> [090108 12:25]:
> > > > Looks like we now have some McBSP clock issue probably related
> > > > to the custom clock:
> > >
> > > Could you please try:
> > > http://marc.info/?l=linux-omap&m=122597514326263&w=2
> > >
> > > And possibly ack the patch?
> >
> > Well this has been on hold as we don't know yet if we should
> > use or not use custom clocks.
> >
> > Custom clocks allow combining multiple clocks into a single clock,
> > which makes it easy to use in the drivers. However, custom clocks
> > have some problems that Paul has pointed out, like not knowing
> > the parent.
> >
> > At this point I'd say that if Paul does not like custom clocks,
> > we should stop using them. Up to Paul to decide me thinks unless
> > somebody has better ideas.
> >
> > > McBSP has a known spin-lock deadlock, why carry it around?
> >
> > Would be nice to get rid of the spin-lock issue.. But this patch
> > still does not help with the McBSP clocks failing because the
> > parent is not known.
> >
> > Regards,
> >
> > Tony
>
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