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Date: Wed, 13 May 2015 13:58:37 +0200
Message-ID: <CACRpkdYffHJEzksc5mg7JZdwTzShGaQofAmbmn65=_V3ot04Rg@mail.gmail.com>
Subject: Re: [PATCH v4 2/3] irqchip: GIC: Add support for irq_{get,set}_irqchip_state
From: Linus Walleij <linus.walleij@linaro.org>
To: Feng Kan <fkan@apm.com>
Cc: Marc Zyngier <marc.zyngier@arm.com>,
        Abhijeet Dharmapurikar <adharmap@codeaurora.org>,
        Stephen Boyd <sboyd@codeaurora.org>, Phong Vo <pvo@apm.com>,
        Tin Huynh <tnhuynh@apm.com>, Y Vo <yvo@apm.com>,
        Thomas Gleixner <tglx@linutronix.de>, Toan Le <toanle@apm.com>,
        Bjorn Andersson <bjorn@kryo.se>, Jason Cooper <jason@lakedaemon.net>,
        Arnd Bergmann <arnd@arndb.de>,
        linux-arm-msm <linux-arm-msm@vger.kernel.org>,
        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
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	<linux-arm-kernel@lists.infradead.org>,
        "linux-gpio@vger.kernel.org" <linux-gpio@vger.kernel.org>,
        Alexandre Courbot <gnurou@gmail.com>
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On Wed, May 13, 2015 at 4:25 AM, Feng Kan <fkan@apm.com> wrote:

> Marc:
>
> Sorry for top posting. It seems with GIC-400, the get_irqstate is not a reliable
> way of accessing the GPIO status. In our case, the gpio interrupt status can
> only be read correctly with the SPISR register. So it seems we have to go
> back to the old way of mapping the SPISR portion of the GIC in our GPIO
> driver. We wanted to ask you if that is acceptable since SPISR in not
> standard in all GIC, perhaps we can treat it differently.

As GPIO maintainer I am curious about what this is...

Can you describe the scenario where your GPIO (!) driver needs
to be poking around in the GIC SPISR?

Yours,
Linus Walleij
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