linux-kernel - Questions About a Semi-Soft irqchip Device

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Message-ID: <CAJgR-Bi2HX+aYVabaFLyu9QAnAS4RmQ7DvBtDHOawkfi08zycA@mail.gmail.com>
Date:	Tue, 8 Jul 2014 09:02:14 -0500
From:	Jon Loeliger <loeliger@...il.com>
To:	linux-kernel@...r.kernel.org, devicetree@...r.kernel.org
Cc:	Thomas Gleixner <tglx@...utronix.de>,
	Jason Cooper <jason@...edaemon.net>,
	Rob Herring <robh+dt@...nel.org>,
	Grant Likely <grant.likely@...aro.org>
Subject: Questions About a Semi-Soft irqchip Device

Folks,

I have a few questions about an interrupt controller IP block
that I would like to support in an ARM SoC port.

My IP block provides software-assignable interrupts.  That
is, I have a large pool of interrupt sources, and a large pool
of interrupt bits in the controller, but they are not physically
tied together. Instead they are assigned by some driver as it
initializes and allocates resources.  This, I think, means that
I can not describe the interrupt  bindings in the DTS file.

So, my first question is:  Should I still write an irqchip device
for this IP block and represent it in the device tree, even
though I will not be able to use it as the referee of an
interrupt = < ... > binding?  I think I should primarily because
other drivers will still need to set up IRQ handling through
this device.

Another question:  This device has a muti-32-bit-word
bit-field representation for the interrupt lines.  It has a
parallel array of words for clearing the interrupt.  Is there
an existing irqchip that I can directly leverage that fits
that description?

Thank you,
jdl
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