linux-kernel - Re: [PATCH v6 1/5] powerpc/85xx: implement hardware timebase sync

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Message-ID: <4FEDD07D.3090103@freescale.com>
Date:	Fri, 29 Jun 2012 10:57:49 -0500
From:	Scott Wood <scottwood@...escale.com>
To:	Tabi Timur-B04825 <B04825@...escale.com>
CC:	Zhao Chenhui-B35336 <B35336@...escale.com>,
	"linuxppc-dev@...ts.ozlabs.org" <linuxppc-dev@...ts.ozlabs.org>,
	Wood Scott-B07421 <B07421@...escale.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"galak@...nel.crashing.org" <galak@...nel.crashing.org>,
	Li Yang-R58472 <r58472@...escale.com>
Subject: Re: [PATCH v6 1/5] powerpc/85xx: implement hardware timebase sync

On 06/29/2012 10:39 AM, Tabi Timur-B04825 wrote:
> On Tue, Jun 26, 2012 at 5:25 AM, Zhao Chenhui
> <chenhui.zhao@...escale.com> wrote:
>> +static void mpc85xx_give_timebase(void)
>> +{
>> +       unsigned long flags;
>> +
>> +       local_irq_save(flags);
>> +
>> +       while (!tb_req)
>> +               barrier();
> 
> I think tb_req and tb_valid need to be 'volatile'.

No, barrier() and mb() take care of that.

>> +static const struct of_device_id mpc85xx_smp_guts_ids[] = {
>> +       { .compatible = "fsl,mpc8572-guts", },
>> +       { .compatible = "fsl,p1020-guts", },
>> +       { .compatible = "fsl,p1021-guts", },
>> +       { .compatible = "fsl,p1022-guts", },
>> +       { .compatible = "fsl,p1023-guts", },
>> +       { .compatible = "fsl,p2020-guts", },
>> +       {},
>> +};
> 
> I wonder if it's possible to dynamically generate the compatible
> string by using the SOC name?

Where are you going to get the SoC name from?

-Scott

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