linux-kernel - Re: [PATCH v6 1/2] irqchip: imx-gpcv2: IMX GPCv2 driver for wakeup sources

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Date:	Tue, 28 Jul 2015 08:47:47 +0800
From:	Shawn Guo <shawnguo@...nel.org>
To:	Shenwei Wang <Shenwei.Wang@...escale.com>
Cc:	"jason@...edaemon.net" <jason@...edaemon.net>,
	Huang Anson <Anson.Huang@...escale.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"tglx@...utronix.de" <tglx@...utronix.de>,
	"shawn.guo@...aro.org" <shawn.guo@...aro.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH v6 1/2] irqchip: imx-gpcv2: IMX GPCv2 driver for wakeup
 sources

On Mon, Jul 27, 2015 at 02:50:15PM +0000, Shenwei Wang wrote:
> The following structure is currently used in both drivers. The members "gpc_base/
> wakeup_sources/enabled_irqs" are now shared to PM driver. And the macro IMR_NUM
> will be referred by both drivers too.
>  
> struct imx_gpcv2_irq {
> 	spinlock_t lock;
> 	void __iomem *gpc_base;

So this is the virtual base used by both irqchip and pm driver, and the
lock is for register access protection, right?  If so, we can define gpc
as a syscon device, and access it from both drivers with regmap.

> 	u32 wakeup_sources[IMR_NUM];

This should be an irqchip internal data and exported to external users like
pm code with an interface like imx_gpcv2_get_wakeup_sources().

> 	u32 enabled_irqs[IMR_NUM];

I do not see how this is used in pm driver.

> 	u32 cpu2wakeup;

The only use of this in pm driver is to unmask interrupt #32 during
initialization.  Why cannot it be done in irqchip driver initialization?

Shawn

> };
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