linux-kernel - Re: [PATCH v4 4/5] ARM: mediatek: Add EINT support to MTK pinctrl driver.

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Date:	Wed, 17 Dec 2014 17:09:25 +0800
From:	Yingjoe Chen <yingjoe.chen@...iatek.com>
To:	Linus Walleij <linus.walleij@...aro.org>
CC:	Rob Herring <robh+dt@...nel.org>,
	Linus Walleij <linus.walleij@...aro.org>,
	Matthias Brugger <matthias.bgg@...il.com>,
	Mark Rutland <mark.rutland@....com>,
	<devicetree@...r.kernel.org>,
	Vladimir Murzin <vladimir.murzin@....com>,
	Russell King <linux@....linux.org.uk>,
	<srv_heupstream@...iatek.com>, Pawel Moll <pawel.moll@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Catalin Marinas <catalin.marinas@....com>,
	<linux-kernel@...r.kernel.org>, <alan.cheng@...iatek.com>,
	<maoguang.meng@...iatek.com>,
	Ashwin Chaugule <ashwin.chaugule@...aro.org>,
	<toby.liu@...iatek.com>, Sascha Hauer <kernel@...gutronix.de>,
	Kumar Gala <galak@...eaurora.org>,
	Grant Likely <grant.likely@...aro.org>,
	<dandan.he@...iatek.com>, <linux-arm-kernel@...ts.infradead.org>,
	Hongzhou Yang <hongzhou.yang@...iatek.com>
Subject: Re: [PATCH v4 4/5] ARM: mediatek: Add EINT support to MTK pinctrl
 driver.

On Wed, 2014-12-17 at 07:34 +0800, Hongzhou Yang wrote:
> From: Maoguang Meng <maoguang.meng@...iatek.com>
> 
> MTK SoC support external interrupt(EINT) from most SoC pins.
> Add EINT support to pinctrl driver.
> 
> Signed-off-by: Maoguang Meng <maoguang.meng@...iatek.com>
> Signed-off-by: Hongzhou Yang <hongzhou.yang@...iatek.com>

Hi Linus,

This patch add EINT support to the pinctrl driver. We've surveyed
GPIOLIB_IRQCHIP, but we didn't use it because:

- Not every GPIO pin support interrupt.
- EINT use a different numbering to GPIO. eg, from the mt8135 table,
GPIO29 is EINT158. It is more nature & efficient to use EINT number as
hwirq.

+               MTK_EINT_FUNCTION(2, 158),
+               MTK_FUNCTION(0, "GPIO29"),

Joe.C



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