From mboxrd@z Thu Jan  1 00:00:00 1970
From: Yingjoe Chen <yingjoe.chen@mediatek.com>
Subject: Re: [PATCH v4 4/5] ARM: mediatek: Add EINT support to MTK pinctrl
 driver.
Date: Wed, 17 Dec 2014 17:09:25 +0800
Message-ID: <1418807365.6443.17.camel@mtksdaap41>
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Cc: Rob Herring <robh+dt@kernel.org>, Linus Walleij <linus.walleij@linaro.org>, Matthias Brugger <matthias.bgg@gmail.com>, Mark Rutland <mark.rutland@arm.com>, devicetree@vger.kernel.org, Vladimir Murzin <vladimir.murzin@arm.com>, Russell King <linux@arm.linux.org.uk>, srv_heupstream@mediatek.com, Pawel Moll <pawel.moll@arm.com>, Ian Campbell <ijc+devicetree@hellion.org.uk>, Catalin Marinas <catalin.marinas@arm.com>, linux-kernel@vger.kernel.org, alan.cheng@mediatek.com, maoguang.meng@mediatek.com, Ashwin Chaugule <ashwin.chaugule@linaro.org>, toby.liu@mediatek.com, Sascha Hauer <kernel@pengutronix.de>, Kumar Gala <galak@codeaurora.org>, Grant Likely <grant.likely@linaro.org>, dandan.he@mediatek.com, linux-arm-kernel@lists.infradead.org, Hongzhou Yang <hongzhou.yang@mediatek.com>
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On Wed, 2014-12-17 at 07:34 +0800, Hongzhou Yang wrote:
> From: Maoguang Meng <maoguang.meng@mediatek.com>
> 
> MTK SoC support external interrupt(EINT) from most SoC pins.
> Add EINT support to pinctrl driver.
> 
> Signed-off-by: Maoguang Meng <maoguang.meng@mediatek.com>
> Signed-off-by: Hongzhou Yang <hongzhou.yang@mediatek.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