linux-kernel - Re: [PATCH RFC RFT 0/3] clk: detect per-user enable imbalances and implement hand-off

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Date:	Fri, 04 Dec 2015 16:46:28 -0800
From:	Michael Turquette <mturquette@...libre.com>
To:	Heiko Stübner <heiko@...ech.de>,
	Michael Turquette <mturquette@...libre.com>
Cc:	linux-kernel@...r.kernel.org, linux-clk@...r.kernel.org,
	sboyd@...eaurora.org, lee.jones@...aro.org,
	maxime.ripard@...e-electrons.com, s.hauer@...gutronix.de,
	geert@...ux-m68k.org
Subject: Re: [PATCH RFC RFT 0/3] clk: detect per-user enable imbalances and
 implement hand-off

Heiko Stübner wrote:
> Hi Mike,
> 
> Am Freitag, 7. August 2015, 12:09:27 schrieb Michael Turquette:
> > This is an alternative solution to Lee's "clk: Provide support for
> > always-on clocks" series[0].
> > 
> > The first two patches introduce run-time checks to ensure that clock
> > consumer drivers are respecting the clk.h api. The former patch checks
> > for prepare and enable imbalances. The latter checks for calls to
> > clk_put without first disabling and unpreparing the clk.
> > 
> > The third patch introduces a new flag, CLK_ENABLE_HAND_OFF, which
> > prepares and enables a clk at registration-time. The reference counts
> > (prepare & enable) are transferred to the first clock consumer driver
> > that clk_get's the clk with this flag set AND calls clk_prepare or
> > clk_enable.
> > 
> > The net result is that a clock with this flag set will be enabled at
> > boot and neither the clk_disable_unused garbage collector or the
> > "sibling clock disables a shared parent" scenario will cause the flagged
> > clock to be disabled. The first driver to come along and explicitly
> > claim, prepare and enable this clock will inherit those reference
> > counts. No change to clock consumer drivers is required for this to
> > work. Please continue to use the clk.h api properly.
> 
> just out of curiosity, did this move anywhere yet? (Last message from october 
> 1st it seems)
> 
> It looks like it is needed to fix the orphan-deferral I need on Rockchip that 
> breaks sunxi in its current state.

Yes, I'm preparing another version. Sorry for high latency, but I've been
traveling for more than 2 months non-stop.

Regards,
Mike

> 
> 
> Thanks
> Heiko


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