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

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Message-ID: <20120423071013.GS26306@S2101-09.ap.freescale.net>
Date:	Mon, 23 Apr 2012 15:10:15 +0800
From:	Shawn Guo <shawn.guo@...aro.org>
To:	Sascha Hauer <s.hauer@...gutronix.de>
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 08:56:23AM +0200, Sascha Hauer wrote:
> On Mon, Apr 23, 2012 at 02:53:01PM +0800, Shawn Guo wrote:
> > On Mon, Apr 23, 2012 at 08:27:39AM +0200, Sascha Hauer wrote:
> > > 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:
...
> > > > > 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.
> > > 
> > Oops, my reply was a brain-dead one.  Hmm, then it seems that we have
> > to introduce cpu_is_mx6() which I tried hard to avoid.  I do not have
> > a preference between defining a macro and asking device tree.
> 
> Since we already have a place in early setup code in which we know that
> we are running on an i.MX6 I suggest for the sake of the symmetry of the
> universe that we introduce a cpu_is_mx6.
> 
Let me try last time.  What about having a late_initcall hook in
machine_desc?

Regards,
Shawn

8<---

diff --git a/arch/arm/include/asm/mach/arch.h b/arch/arm/include/asm/mach/arch.h
index d7692ca..0b1c94b 100644
--- a/arch/arm/include/asm/mach/arch.h
+++ b/arch/arm/include/asm/mach/arch.h
@@ -43,6 +43,7 @@ struct machine_desc {
        void                    (*init_irq)(void);
        struct sys_timer        *timer;         /* system tick timer    */
        void                    (*init_machine)(void);
+       void                    (*init_late)(void);
 #ifdef CONFIG_MULTI_IRQ_HANDLER
        void                    (*handle_irq)(struct pt_regs *);
 #endif
diff --git a/arch/arm/kernel/setup.c b/arch/arm/kernel/setup.c
index ebfac78..549f036 100644
--- a/arch/arm/kernel/setup.c
+++ b/arch/arm/kernel/setup.c
@@ -800,6 +800,14 @@ static int __init customize_machine(void)
 }
 arch_initcall(customize_machine);

+static int __init init_machine_late(void)
+{
+       if (machine_desc->init_late)
+               machine_desc->init_late();
+       return 0;
+}
+late_initcall(init_machine_late);
+
 #ifdef CONFIG_KEXEC
 static inline unsigned long long get_total_mem(void)
 {
diff --git a/arch/arm/mach-imx/mach-imx6q.c b/arch/arm/mach-imx/mach-imx6q.c
index da6c1d9..0e3640f 100644
--- a/arch/arm/mach-imx/mach-imx6q.c
+++ b/arch/arm/mach-imx/mach-imx6q.c
@@ -142,6 +142,7 @@ DT_MACHINE_START(IMX6Q, "Freescale i.MX6 Quad (Device Tree)")
        .handle_irq     = imx6q_handle_irq,
        .timer          = &imx6q_timer,
        .init_machine   = imx6q_init_machine,
+       .init_late      = imx6q_init_late,
        .dt_compat      = imx6q_dt_compat,
        .restart        = imx6q_restart,
 MACHINE_END
--
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