linux-kernel - Re: [PATCH v5 05/10] dt-bindings: irqchip: Introduce TISCI Interrupt router bindings

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Message-ID: <20190215161629.GK5720@atomide.com>
Date:   Fri, 15 Feb 2019 08:16:29 -0800
From:   Tony Lindgren <tony@...mide.com>
To:     Lokesh Vutla <lokeshvutla@...com>
Cc:     marc.zyngier@....com, Nishanth Menon <nm@...com>,
        Santosh Shilimkar <ssantosh@...nel.org>,
        Rob Herring <robh+dt@...nel.org>, tglx@...utronix.de,
        jason@...edaemon.net,
        Linux ARM Mailing List <linux-arm-kernel@...ts.infradead.org>,
        linux-kernel@...r.kernel.org,
        Device Tree Mailing List <devicetree@...r.kernel.org>,
        Sekhar Nori <nsekhar@...com>, Tero Kristo <t-kristo@...com>,
        Peter Ujfalusi <peter.ujfalusi@...com>
Subject: Re: [PATCH v5 05/10] dt-bindings: irqchip: Introduce TISCI Interrupt
 router bindings

Hi,

* Lokesh Vutla <lokeshvutla@...com> [190214 18:03]:
> On 2/14/2019 11:16 PM, Tony Lindgren wrote:
> > But I'd rather have a proper hardware based phandle + index
> > type mapping in the dts if possible though.
> 
> The idea about sysfw here is that Linux is not aware of anything about
> this device(Interrupt Router). It cannot even access any of its
> registers. As a user Linux should know who is the parent to which the
> Interrut router output should be configured. Then query sysfw about the
> range of gic irqs allocated to it. Now for configuration, Linux should
> pass the the input to interrupt router, gic irq no, and gic id(by which
> sysfw uniquely identifies GIC interrupt controller with the SoC).  Based
> on these parameters Interrupt Router registers gets configured.

If the interrupt router hardawre is hidden away from Linux,
just leave it out of the device tree completely and have the
interrupt controller driver request the routing.

The dts node for the interrupt controller should describe a
proper Linux device, that is with reg entries and so on.

Regards,

Tony