linux-kernel - Re: [PATCH] clk: imx: fix ahb clock mux 1

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Message-ID: <20160503123718.GG5874@tiger>
Date:	Tue, 3 May 2016 20:37:19 +0800
From:	Shawn Guo <shawnguo@...nel.org>
To:	Dong Aisheng <dongas86@...il.com>
Cc:	Adrian Alonso <aalonso@...escale.com>,
	Frank Li <Frank.Li@...escale.com>,
	Michael Turquette <mturquette@...libre.com>,
	Stephen Boyd <sboyd@...eaurora.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Stefan Agner <stefan@...er.ch>,
	"kernel@...gutronix.de" <kernel@...gutronix.de>,
	Anson Huang <b20788@...escale.com>, linux-clk@...r.kernel.org,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH] clk: imx: fix ahb clock mux 1

On Tue, May 03, 2016 at 06:50:21PM +0800, Dong Aisheng wrote:
> Hi Shawn,
> 
> On Tue, May 3, 2016 at 4:32 PM, Shawn Guo <shawnguo@...nel.org> wrote:
> > On Thu, Apr 28, 2016 at 02:07:03PM -0700, Stefan Agner wrote:
> >> The clock parent of the AHB root clock when using mux option 1
> >> is the SYS PLL 270MHz clock. This is specified in  Table 5-11
> >> Clock Root Table of the i.MX 7Dual Applications Processor
> >> Reference Manual.
> >>
> >> While it could be a documentation error, the 270MHz parent is
> >> also mentioned in the boot ROM configuration in Table 6-28: The
> >> clock is by default at 135MHz due to a POST_PODF value of 1
> >> (=> divider of 2).
> >>
> >> Signed-off-by: Stefan Agner <stefan@...er.ch>
> >
> > Anson, Frank,
> >
> > Can you guys confirm this change is correct?
> >
> 
> I just checked the doc,
> it's correct the parent should be SYS_PLL_PFD2(270Mhz).
> It's a documentation error of early version and it's already fixed
> in latest internal doc.

Thanks for the confirmation.

Shawn