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

Hi,

* Lokesh Vutla [off-list ref] [190214 18:03]:

On 2/14/2019 11:16 PM, Tony Lindgren wrote:

quoted

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