linux-kernel - Re: [PATCH v2 00/10] Add support for TISCI irqchip drivers

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Message-ID: <942981b8-7536-2b6b-ad49-dc59671cbda6@oracle.com>
Date:   Mon, 22 Oct 2018 13:39:02 -0700
From:   Santosh Shilimkar <santosh.shilimkar@...cle.com>
To:     Lokesh Vutla <lokeshvutla@...com>, Nishanth Menon <nm@...com>,
        Rob Herring <robh+dt@...nel.org>, tglx@...utronix.de,
        jason@...edaemon.net, marc.zyngier@....com
Cc:     Santosh Shilimkar <ssantosh@...nel.org>,
        Linux ARM Mailing List <linux-arm-kernel@...ts.infradead.org>,
        linux-kernel@...r.kernel.org, Tero Kristo <t-kristo@...com>,
        Sekhar Nori <nsekhar@...com>,
        Device Tree Mailing List <devicetree@...r.kernel.org>,
        Grygorii Strashko <grygorii.strashko@...com>,
        Peter Ujfalusi <peter.ujfalusi@...com>
Subject: Re: [PATCH v2 00/10] Add support for TISCI irqchip drivers

On 10/18/2018 8:40 AM, Lokesh Vutla wrote:
> TISCI abstracts the handling of IRQ routes where interrupt sources
> are not directly connected to host interrupt controller. This series
> adds support for:
> - TISCI commands needed for IRQ configuration
> - Interrupt Router(INTR) and Interrupt Aggregator(INTA) drivers
> 
> More information on TISCI IRQ management can be found here[1].
> Complete TISCI resource management information can be found here[2].
> AM65x SoC related TISCI information can be found here[3].
> INTR and INTA related information can be found in TRM[4].
> 
I didn't read the specs but from what you described in
INTA and INTR bindings, does the flow of IRQs like below ?

Device IRQ(e.g USB) -->INTR-->INTA--->HOST IRQ controller(GIC)

The confusing part is aggregator and can multiplex as well
as grouping but seems like its event grouping or multiplexing
than actual device IRQ grouping or multi-plexsing.

What am I missing ?

Regards,S
antosh