linux-kernel - Re: [PATCH RFC RFT 3/3] clk: introduce CLK_ENABLE_HAND

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Message-ID: <CAMuHMdVWxpZUQk6gUhSqA4K3gpDD8wUC6SHg6HAoiC1w=3+GLw@mail.gmail.com>
Date:	Tue, 11 Aug 2015 12:11:05 +0200
From:	Geert Uytterhoeven <geert@...ux-m68k.org>
To:	Maxime Coquelin <maxime.coquelin@...com>
Cc:	Lee Jones <lee.jones@...aro.org>,
	Michael Turquette <mturquette@...libre.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	linux-clk@...r.kernel.org, Stephen Boyd <sboyd@...eaurora.org>,
	Maxime Ripard <maxime.ripard@...e-electrons.com>,
	Sascha Hauer <s.hauer@...gutronix.de>
Subject: Re: [PATCH RFC RFT 3/3] clk: introduce CLK_ENABLE_HAND_OFF flag

Hi Maxime,

On Tue, Aug 11, 2015 at 12:02 PM, Maxime Coquelin
<maxime.coquelin@...com> wrote:
> 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 |= CLK_ENABLE_HAND_OFF;

> Could we imagine having a kind of "clocks-enable-hand-off" property we could
> use in our clock controller DT node?

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

However, not disabling clocks is a software policy, not a hardware description,
so IMHO it doesn't belong in DT.

Gr{oetje,eeting}s,

                        Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-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
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