[PATCH] clk: vexpress: Add separate SP810 driver

[Pawel Moll]

On Mon, 2013-04-22 at 15:25 +0100, Russell King - ARM Linux wrote:
> >         /* Switch the parent if necessary */
> > -       if (old_parent != new_parent)
> > +       if (old_parent != new_parent) {
> > +               clk_prepare(new_parent);
> >                 clk_set_parent(hw->clk, new_parent);
> > +               clk_unprepare(old_parent);
> > +       }
> > 
> > So, to summarize, the patch that works for me is below.
> 
> So what if the old parent clock wasn't prepared?

The clk_prepare() does __clk_prepare(clk->parent) before
clk->ops->prepare(clk->kw), so the old_parent is always prepared.

Paweł