linux-kernel - Re: [PATCH] ARM: imx6q: Add missing esai

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Message-ID: <20140109145753.GV20094@book.gsilab.sittig.org>
Date:	Thu, 9 Jan 2014 15:57:53 +0100
From:	Gerhard Sittig <gsi@...x.de>
To:	Nicolin Chen <Guangyu.Chen@...escale.com>, shawn.guo@...aro.org,
	kernel@...gutronix.de, linux@....linux.org.uk,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	rob.herring@...xeda.com, pawel.moll@....com, mark.rutland@....com,
	ijc+devicetree@...lion.org.uk, galak@...eaurora.org,
	devicetree@...r.kernel.org, rob@...dley.net, mturquette@...aro.org
Subject: Re: [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 <gsi@...x.de>
  To: linuxppc-dev@...ts.ozlabs.org, Anatolij Gustschin <agust@...x.de>,
	  Mike Turquette <mturquette@...aro.org>,
	  linux-arm-kernel@...ts.infradead.org, devicetree@...r.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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