[PATCH] ARM: imx6q: Add missing esai_ahb clock to current clock tree

On Thu, Jan 09, 2014 at 08:55 +0100, Sascha Hauer wrote:

[ ... ]

We have the situation here that a single bit controls two clocks. As
Shawn mentioned just using two gates on the same bit doesn't work
properly. Do we need a new basic clock type or expand the common gate
code somehow?
This situation happens from time to time and I haven't seen a solution
for this.

You may want to lookup the following message:

  Date: Tue, 23 Jul 2013 15:14:06 +0200
  From: Gerhard Sittig [off-list ref]
  To: linuxppc-dev at lists.ozlabs.org, Anatolij Gustschin [off-list ref],
	  Mike Turquette [off-list ref],
	  linux-arm-kernel at lists.infradead.org, devicetree at vger.kernel.org
  Cc: [ ... ]
  Subject: Re: [PATCH v3 17/31] clk: mpc512x: introduce COMMON_CLK for MPC512x

  http://lists.infradead.org/pipermail/linux-arm-kernel/2013-July/185687.html

The specific situation was for MS-CAN on PowerPC, but it inspired
my outlining an approach to "shared clock gates".  See an example
implementation towards the end of the message with both the
clk-gate.c extension, as well as rather generic example use.

My approach turned out to not be needed, but it might serve as a
starting point for you.  You'd have to add support for static
declaration though, but this should be straight forward.


virtually yours
Gerhard Sittig
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