Quoting Geert Uytterhoeven (2015-08-11 03:11:05)

Hi Maxime,
=

On Tue, Aug 11, 2015 at 12:02 PM, Maxime Coquelin
[off-list ref] wrote:

quoted

How can we pass CLK_ENABLE_HAND_OFF flag to a specific clock on STi
platform?

=

Add the flag to the relevant clocks in the C code, e.g. in
clk_register_flexgen():
=

        if (!strcmp(name, "clk-icn-cpu"))
                init.flags |=3D CLK_ENABLE_HAND_OFF;
=

quoted

Could we imagine having a kind of "clocks-enable-hand-off" property we =

could

quoted

use in our clock controller DT node?

=

You can imagine doing "flex_flags |=3D CLK_ENABLE_HAND_OFF" in
st_of_flexgen_setup(), depending on the presence of such a property.

This is precisely what Lee is trying to avoid. The would constitute a
hand-rolled, open-code, gather-and-mark exercise that drivers would have
to re-invent each time. (rough paraphrase of what Lee said)

I think that we can come up with a reasonable DT wrapper around the
flag. I will be ecstatic if we can agree that the meaning of the flag
can be tweaked just a bit to mean, "prevent this critical clock from
being disabled, as it was enabled out of reset or by the bootloader,
until a driver claims it and calls clk_prepare_enable".

Then everyone should be happy.

Regards,
Mike

=

However, not disabling clocks is a software policy, not a hardware descri=

ption,

so IMHO it doesn't belong in DT.
=

Gr{oetje,eeting}s,
=

                        Geert
=

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m6=

8k.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
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