linux-kernel - Re: [PATCH v3 4/6] clk: sunxi-ng: mux: Add clk notifier functions

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Date:   Thu, 25 Aug 2016 22:31:17 +0200
From:   Maxime Ripard <maxime.ripard@...e-electrons.com>
To:     Chen-Yu Tsai <wens@...e.org>
Cc:     Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...eaurora.org>, linux-clk@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        devicetree@...r.kernel.org
Subject: Re: [PATCH v3 4/6] clk: sunxi-ng: mux: Add clk notifier functions

On Thu, Aug 25, 2016 at 02:21:58PM +0800, Chen-Yu Tsai wrote:
> On sunxi we support cpufreq by changing the clock rate of PLL-CPU.
> It's possible the clock output of the PLL goes out of the CPU's
> operational limits when the PLL's multipliers / dividers are changed
> and it hasn't stabilized yet. This would result in the CPU hanging.
> 
> To circumvent this, we temporarily switch the CPU mux clock to another
> stable clock before the rate change, and switch it back after the PLL
> stabilizes. This is done with clk notifiers registered on the PLL.
> 
> This patch adds common functions for notifiers to reparent mux clocks.
> 
> Signed-off-by: Chen-Yu Tsai <wens@...e.org>

Applied, thanks!
Maxime

-- 
Maxime Ripard, Free Electrons
Embedded Linux and Kernel engineering
http://free-electrons.com

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