linux-kernel - Re: [PATCH 1/3] ARM: imx: Add common imx cpuidle init functionality.

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Date:	Mon, 23 Apr 2012 08:27:39 +0200
From:	Sascha Hauer <s.hauer@...gutronix.de>
To:	Shawn Guo <shawn.guo@...aro.org>
Cc:	Rob Lee <rob.lee@...aro.org>,
	Amit Kucheria <amit.kucheria@...aro.org>,
	kernel@...gutronix.de, linaro-dev@...ts.linaro.org,
	patches@...aro.org, daniel.lezcano@...aro.org,
	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH 1/3] ARM: imx: Add common imx cpuidle init functionality.

On Mon, Apr 23, 2012 at 01:18:21PM +0800, Shawn Guo wrote:
> On Sun, Apr 22, 2012 at 11:44:39PM -0500, Rob Lee wrote:
> > >> I don't think we need a cpu_is_imx6q(), but having some i.MX6 specific
> > >> hook at device_initcall time can't be too wrong. Shawn?
> > >>
> > > Yep, it works for me.
> > >
> > Sascha, Shawn, thanks for the response.
> > 
> > Since device_initcall isn't platform specific, it seems I would still
> > need a cpu_is_imx6q() function or similiar functionality from a device
> > tree call.  Or do you have something else in mind that I'm not seeing?
> > 
> I guess Sascha is asking for something like the following.
> 
> static int __init imx_device_init(void)
> {
> 	imx5_device_init();
> 	imx6_device_init();
> }
> device_initcall(imx_device_init)
> 
> static int __init imx6_device_init(void)
> {
> 	/*
> 	 * do whatever needs to get done in device_initcall time
> 	 */
> }

The problem is more how we can detect that we are actually running a
i.MX6 SoC. We could directly ask the devicetree in an initcall or we
could introduce a cpu_is_mx6() just like we have a macro for all other
i.MX SoCs.

Sascha

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