Hi Russell,

On Wed, Jul 18, 2018 at 3:02 PM Russell King - ARM Linux
[off-list ref] wrote:

On Wed, Jul 18, 2018 at 01:57:38PM +0100, Phil Edworthy wrote:

quoted

Behaves the same as (devm_)clk_get except where there is no clock
producer. In this case, instead of returning -ENOENT, the function
returns NULL. This makes error checking simpler and allows
clk_prepare_enable, etc to be called on the returned reference
without additional checks.

How does this work with non-DT systems, where looking a clock up which
isn't yet registered with clkdev returns -ENOENT ?

(clkdev doesn't know when all clocks are registered with it.)

Good question.

I guess all drivers trying to handle optional clocks this way are already broken
on non-DT systems where clocks may be registered late...

Gr{oetje,eeting}s,

                        Geert

-- 
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert at linux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds