Re: [PATCH v13 05/13] clk: ingenic: Add driver for the TCU clocks

[Stephen Boyd <sboyd@kernel.org>]

Quoting Paul Cercueil (2019-06-25 15:37:07)
> > 
> > Do you need to get the clk by name? Or can that clk be "known" to the
> > TCU somehow so we can already have a direct clk pointer?
> 
> This clock is provided by a separate driver, so I have to obtain the
> clock pointer from devicetree.

Ok.

> >>  +}
> >>  +
> >>  +static int __maybe_unused tcu_pm_suspend(void)
> >>  +{
> >>  +       struct ingenic_tcu *tcu = ingenic_tcu;
> >>  +
> >>  +       if (tcu->clk)
> >>  +               clk_disable(tcu->clk);
> > 
> > Do you need to unprepare? Or it just isn't possible because this is
> > called from syscore and thus we can't sleep?
> 
> I thought that clk_disable() was enough. We don't actually need to
> unprepare, do we? And yes, as you pointed out, this call cannot sleep.

Yeah unprepare isn't necessary, but it will be different on different
platforms. This is a highly platform specific driver though so I suspect
this is all fine.