linux-kernel - Re: [PATCH 1/3] misc: Add crossbar driver

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Date:	Thu, 18 Jul 2013 21:25:04 +0300
From:	Felipe Balbi <balbi@...com>
To:	Sricharan R <r.sricharan@...com>
CC:	<linux-kernel@...r.kernel.org>,
	<devicetree-discuss@...ts.ozlabs.org>, <linux-doc@...r.kernel.org>,
	<linux-arm-kernel@...ts.infradead.org>,
	<linux-omap@...r.kernel.org>, <tony@...mide.com>,
	<linux@....linux.org.uk>, <nm@...com>, <rnayak@...com>,
	<balbi@...com>
Subject: Re: [PATCH 1/3] misc: Add crossbar driver

Hi,

On Thu, Jul 18, 2013 at 10:13:48PM +0530, Sricharan R wrote:
> Some socs have a large number of interrupts/dma requests to service
> the needs of its many peripherals and subsystems. All of the
> requests lines from the subsystems are not needed at the same
> time, so they have to be muxed to the controllers appropriately.
> In such places a interrupt/dma controllers are preceded by an
> IRQ/DMA CROSSBAR that provides flexibility in muxing the device
> requests to the controller inputs.
> 
> The Peripheral irq/dma requests are connected to one crossbar's input
> and the output of the crossbar is connected to controller's input
> line. On POR, there are some mappings which are done by default.
> Those peripherals which do not have a mapping on POR, should be configured
> to route its requests using the crossbar.
> 
> The drivers identifies every controller's crossbar as individual devices.
> The mappings can be specified from the DT crossbar nodes and those gets mapped
> during the crossbar device's probe. The mappings can also be specified by adding
> the crossbar lines to the peripheral device nodes and map it with
> crossbar_map/unmap apis.
> 
> Signed-off-by: Sricharan R <r.sricharan@...com>

why isn't this done under pinctrl ? If all it does is mux DMA and IRQ
request lines, it should be written as a pinctrl driver no ?

-- 
balbi

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