Hi Jason,

On Tue, 13 Jan 2015 14:00:50 -0500
Jason Cooper [off-list ref] wrote:

Boris,

On Tue, Jan 13, 2015 at 07:46:18PM +0100, Boris Brezillon wrote:

quoted

Add documentation for the dumb demuxer.

Signed-off-by: Boris Brezillon <boris.brezillon-wi1+55ScJUtKEb57/3fJTNBPR1lH4CV8@public.gmane.org>
---
 .../bindings/interrupt-controller/dumb-demux.txt   | 34 ++++++++++++++++++++++
 1 file changed, 34 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/interrupt-controller/dumb-demux.txt

diff --git a/Documentation/devicetree/bindings/interrupt-controller/dumb-demux.txt b/Documentation/devicetree/bindings/interrupt-controller/dumb-demux.txt
new file mode 100644
index 0000000..1c777ef
--- /dev/null
+++ b/Documentation/devicetree/bindings/interrupt-controller/dumb-demux.txt

@@ -0,0 +1,34 @@
+* Generic Dumb Interrupt Demultiplexer
+
+This Dumb demultiplixer simply forward all incoming interrupts to its
+enabled/unmasked children.

Please forgive the potentially naïve question, but what hardware is this
describing?

That's not a real hardware per se, but on some hardware (like at91 SoCs)
some IRQ line are shared by several peripherals, and this dumb
demultiplex is here to represent such shared irq lines which cannot be
easily demultiplexed (because they do not provide a 'cause'
register).

You can see it as a virtual irqchip provided to address broken hardware
designs.

Regards,

Boris

-- 
Boris Brezillon, Free Electrons
Embedded Linux and Kernel engineering
http://free-electrons.com
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