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

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Date:	Fri, 19 Jul 2013 00:17:29 -0700
From:	Tony Lindgren <tony@...mide.com>
To:	Santosh Shilimkar <santosh.shilimkar@...com>
Cc:	Nishanth Menon <nm@...com>, balbi@...com,
	Sricharan R <r.sricharan@...com>, linux@....linux.org.uk,
	linux-doc@...r.kernel.org, devicetree-discuss@...ts.ozlabs.org,
	rnayak@...com, linux-kernel@...r.kernel.org,
	linux-omap@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	Linus Walleij <linus.walleij@...aro.org>
Subject: Re: [PATCH 1/3] misc: Add crossbar driver

> On Thursday 18 July 2013 02:56 PM, Nishanth Menon wrote:
> 
> Since the cross-bar is not limited t0 IRQ lines and applicable for
> DMA request lines as well, making it IRQ chip doesn't make sense. Its
> not typical pin control functionality either but at least that framework
> is much closer to consider as an option.
> 
> Actually its more of setting up the IRQ and DMA pins maps once
> at boot for a given SOC based on chosen configuration by the
> board. So I am leaning towards pinctrl as well. Just haven't
> thought enough about whether thats the best approach.
> 
> CC'ing Linus W and Tony L whether we can use pinctrl framework
> for such an IP and if yes how ;-).

If it really muxes signals then using pinctrl seems logical.
Especially if the registers are in the SCM block.

It might be already possible to handle it already with
pinctrl-single,bits for the muxing part.

Regards,

Tony
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