linux-kernel - Re: [PATCH] Add device tree file for the armadeus apf27

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Message-ID: <20121031073216.GI1641@pengutronix.de>
Date:	Wed, 31 Oct 2012 08:32:16 +0100
From:	Sascha Hauer <s.hauer@...gutronix.de>
To:	Philippe Reynes <tremyfr@...oo.fr>
Cc:	"eric.jarrige@...adeus.org" <eric.jarrige@...adeus.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"julien.boibessot@...adeus.com" <julien.boibessot@...adeus.com>
Subject: Re: [PATCH] Add device tree file for the armadeus apf27

On Tue, Oct 30, 2012 at 07:55:44PM +0000, Philippe Reynes wrote:
> 
> 
> Hi Sascha,
> >> +        osc26m {
> 
> >> +            compatible = "fsl,imx-osc26m", "fixed-clock";
> >> +            clock-frequency = <33554432>;
> 
> >Is this really correct? The Datasheet specificies 26MHz, some boards
> >have 27Mhz, but 33?
> 
> The clock value on this board is  32.768kHz, so 32768 * 1024.
> I've tried others value, all others produce weird behaviour on the serial.

Ok, so your board runs with the 32.768KHz clock input. I didn't know
there are boards that use this as the reference clock. It seems this
is not handled in the current clk code. Could you test the patch I just
sent to the mailing list (Cced you) and provide a Tested-by tag if it
works? The clock frequency provided in the device tree shouldn't make
a difference then anymore. You should specify it to 0 if you have
nothing connected there.

Sascha

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