linux-kernel - Re: [RFC] MIPS: BCM63XX: add Device Tree clock definitions

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Date:	Fri, 16 Nov 2012 21:15:24 -0700
From:	Stephen Warren <swarren@...dotorg.org>
To:	Jonas Gorski <jonas.gorski@...il.com>
CC:	linux-mips@...ux-mips.org, Ralf Baechle <ralf@...ux-mips.org>,
	John Crispin <blogic@...nwrt.org>,
	Maxime Bizon <mbizon@...ebox.fr>,
	Florian Fainelli <florian@...nwrt.org>,
	Kevin Cernekee <cernekee@...il.com>,
	devicetree-discuss@...ts.ozlabs.org, linux-kernel@...r.kernel.org
Subject: Re: [RFC] MIPS: BCM63XX: add Device Tree clock definitions

On 11/14/2012 05:11 AM, Jonas Gorski wrote:
> On 13 November 2012 06:02, Stephen Warren <swarren@...dotorg.org> wrote:
>> On 11/11/2012 05:50 AM, Jonas Gorski wrote:
>>> Add definitions for the clocks found and used in all supported SoCs.
>>
>>> diff --git a/arch/mips/bcm63xx/dts/bcm6328.dtsi b/arch/mips/bcm63xx/dts/bcm6328.dtsi
>>
>>> +                     clocks {
>>> +                             #address-cells = <1>;
>>> +                             #size-cells = <0>;
>>> +
>>> +                             periph: pll {
>>> +                                     compatible = "brcm,bcm63xx-clock";
>>> +                                     #clock-cells = <0>;
>>> +                                     clock-frequency = <50000000>;
>>> +                                     clock-output-names = "periph";
>>> +                             };
>>
>> Here too, it seems like some reg properties would be required.
> 
> This is more or less a dummy clock with no real backing for it, but
> some of the drivers expect this clock to be present (even just to get
> the frequency).

Should compatible="fixed-clock" then if this is just a dummy? Ideally
though, nothing "dummy" would be added to the DT; the kernel would
continue to provide the dummy values via code until the DT was able to
fully represent the actual HW.
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