linux-kernel - Re: [PATCH V2 1/6] Documentation: add dts binding for X-Gene reboot dts node.

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Message-ID: <CAL85gmCA4kBsRUMC_ENjGfCq5jM11iY5Jx_+A3V9XQDU0b7E0A@mail.gmail.com>
Date:	Mon, 13 Jan 2014 16:42:46 -0800
From:	Feng Kan <fkan@....com>
To:	Arnd Bergmann <arnd@...db.de>
Cc:	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	Mark Rutland <mark.rutland@....com>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-acpi@...r.kernel.org" <linux-acpi@...r.kernel.org>
Subject: Re: [PATCH V2 1/6] Documentation: add dts binding for X-Gene reboot
 dts node.

>
> Is this related to the standard ARM SCU that manages multiprocessor
> systems, or a different unit that uses the same name?

FKAN: You mean the snoop control unit in ARM. This is different from
that, the main function of this unit is clk control.

>
> Since this is a global register range with a variety of things in it,
> the best candidate IMHO would be to use the "syscon" driver. You can
> mark the device node as 'compatible="apm,xgene-scu","syscon"' to let
> it get picked up by the drivers/mfd/syscon driver, which creates
> a "regmap" structure for it.
>
> The reset driver then uses a DT reference with a phandle to the
> SCU node and calls syscon_regmap_lookup_by_phandle() to get the
> regmap. It can get the register number inside the regmap from DT
> as well and use the regmap API to perform the reset.

Thanks, will do.
>
>         Arnd
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