linux-kernel - Re: [PATCH v6 3/3] ARM: dts: vf610: add Miscellaneous System Control Module (MSCM)

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Date:	Wed, 11 Mar 2015 04:05:39 +0000
From:	Jason Cooper <jason@...edaemon.net>
To:	Shawn Guo <shawn.guo@...aro.org>
Cc:	Stefan Agner <stefan@...er.ch>, tglx@...utronix.de,
	mark.rutland@....com, marc.zyngier@....com,
	u.kleine-koenig@...gutronix.de, kernel@...gutronix.de,
	arnd@...db.de, robh+dt@...nel.org, pawel.moll@....com,
	ijc+devicetree@...lion.org.uk, galak@...eaurora.org,
	pebolle@...cali.nl, linux@....linux.org.uk,
	devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v6 3/3] ARM: dts: vf610: add Miscellaneous System Control
 Module (MSCM)

On Wed, Mar 11, 2015 at 08:48:15AM +0800, Shawn Guo wrote:
> On Sun, Mar 01, 2015 at 11:41:29PM +0100, Stefan Agner wrote:
> > Add the Miscellaneous System Control Module (MSCM) to the base
> > device tree for Vybrid SoC's. This module contains registers
> > to get information of the individual and current (accessing)
> > CPU. In a second block, there is an interrupt router, which
> > handles the routing of the interrupts between the two CPU cores
> > on VF6xx variants of the SoC. However, also on single core
> > variants the interrupt router needs to be configured in order
> > to receive interrupts on the CPU's interrupt controller. Almost
> > all peripheral interrupts are routed through the router, hence
> > the MSCM module is the default interrupt parent for this SoC.
> > 
> > In a earlier commit the interrupt nodes were moved out of the
> > peripheral nodes and specified in the CPU specific vf500.dtsi
> > device tree. This allowed to use the base device tree vfxxx.dtsi
> > also for a Cortex-M4 specific device tree, which uses different
> > interrupt nodes due to the NVIC interrupt controller. However,
> > since the interrupt parent for peripherals is the MSCM module
> > independently which CPU the device tree is used for, we can move
> > the interrupt nodes into the base device tree vfxxx.dtsi again.
> > Depending on which CPU this base device tree will be used with,
> > the correct parent interrupt controller has to be assigned to
> > the MSCM-IR node (GIC or NVIC). The driver takes care of the
> > parent interrupt controller specific needs (interrupt-cells).
> > 
> > Acked-by: Marc Zyngier <marc.zyngier@....com>
> > Signed-off-by: Stefan Agner <stefan@...er.ch>
> 
> Stefan,
> 
> I guess this patch has a run-time dependency on the first two in the
> series, right?  Or put it another way, if I apply this single patch on
> my branch, the dtb and kernel built from the same branch do not work
> together, right?  If so, we will need to either wait for the first two
> hit mainline or pull Jason's irqchip/vybrid branch into my tree as
> prerequisite (irqchip/vybrid needs to be stable).

No problem, I'll only add patches on top of this if needed.  no rebasing.

thx,

Jason.
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