From mboxrd@z Thu Jan 1 00:00:00 1970 From: maxime.ripard@free-electrons.com (Maxime Ripard) Date: Thu, 25 Aug 2016 22:31:17 +0200 Subject: [PATCH v3 4/6] clk: sunxi-ng: mux: Add clk notifier functions In-Reply-To: <20160825062200.17206-5-wens@csie.org> References: <20160825062200.17206-1-wens@csie.org> <20160825062200.17206-5-wens@csie.org> Message-ID: <20160825203117.GE32598@lukather> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org 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 Applied, thanks! Maxime -- Maxime Ripard, Free Electrons Embedded Linux and Kernel engineering http://free-electrons.com -------------- next part -------------- A non-text attachment was scrubbed... Name: signature.asc Type: application/pgp-signature Size: 819 bytes Desc: not available URL: