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SubjectRe: [PATCH v4 00/13] Add support for TISCI irqchip drivers
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Hi Marc,

On 27/12/18 11:38 AM, Lokesh Vutla wrote:
> TI AM65x SoC based on K3 architecture, introduced support for Events
> which are message based interrupts with minimal latency. These events
> are not compatible with regular interrupts and are valid only through
> an event transport lane. An Interrupt Aggregator(INTA) is introduced
> to convert these events to interrupts. INTA can also group 64 events
> into a single interrupt. Now the SoC has many peripherals and a large
> number of event sources (time sync or DMA), the use of events is
> completely dependent on a user's specific application, which drives a
> need for maximum flexibility in which event sources are used in the
> system. It is also completely up to software control as to how the
> events are serviced.
>
> Because of the huge flexibility there are certain standard peripherals
> (like GPIO etc)where all interrupts cannot be directly corrected to host
> interrupt controller. For this purpose, Interrupt Router(INTR) is
> introduced in the SoC. INTR just does a classic interrupt redirection.
>
> So the SoC has 3 types of interrupt controllers:
> - GIC500
> - Interrupt Router
> - Interrupt Aggregator
>
> Below is a diagrammatic view of how SoC integration of these interrupt
> controllers:(https://pastebin.ubuntu.com/p/9ngV3jdGj2/)
>
> Device Index-x Device Index-y
> | |
> | |
> ....
> \ /
> \ /
> \ (global events) /
> +---------------------------+ +---------+
> | | | |
> | INTA | | GPIO |
> | | | |
> +---------------------------+ +---------+
> | (vint) |
> | |
> \|/ |
> +---------------------------+ |
> | |<-------+
> | INTR |
> | |
> +---------------------------+
> |
> |
> \|/ (gic irq)
> +---------------------------+
> | |
> | GIC |
> | |
> +---------------------------+


Can you please take a look at the MSI changes and provide your feedback? There
are few places(mentioned in the respective patches) where I felt I am hacking
around. It would be really helpful if you give any direction for such hacks.

Thanks and regards,
Lokesh

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