linux-kernel - Re: [PATCH v2 04/14] irqchip: pruss: Add a PRUSS irqchip driver for PRUSS interrupts

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Date:   Tue, 05 Feb 2019 11:04:15 +0000
From:   Marc Zyngier <marc.zyngier@....com>
To:     Roger Quadros <rogerq@...com>
Cc:     Tony Lindgren <tony@...mide.com>, <ohad@...ery.com>,
        <bjorn.andersson@...aro.org>, <s-anna@...com>,
        <david@...hnology.com>, <nsekhar@...com>, <t-kristo@...com>,
        <nsaulnier@...com>, <jreeder@...com>, <m-karicheri2@...com>,
        <woods.technical@...il.com>, <linux-omap@...r.kernel.org>,
        <linux-remoteproc@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <devicetree@...r.kernel.org>, "Andrew F. Davis" <afd@...com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Jason Cooper <jason@...edaemon.net>
Subject: Re: [PATCH v2 04/14] irqchip: pruss: Add a PRUSS irqchip driver for PRUSS interrupts

On Tue, 05 Feb 2019 10:35:44 +0000,
Roger Quadros <rogerq@...com> wrote:
> 
> On 04/02/19 20:15, Tony Lindgren wrote:
> > * Roger Quadros <rogerq@...com> [190204 14:23]:
> >> From: "Andrew F. Davis" <afd@...com>
> >>
> >> The Programmable Real-Time Unit Subsystem (PRUSS) contains an
> >> interrupt controller (INTC) that can handle various system input
> >> events and post interrupts back to the device-level initiators.
> >> The INTC can support upto 64 input events with individual control
> >> configuration and hardware prioritization. These events are mapped
> >> onto 10 interrupt signals through two levels of many-to-one mapping
> >> support. Different interrupt signals are routed to the individual
> >> PRU cores or to the host CPU.
> >>
> >> The PRUSS INTC platform driver manages this PRUSS interrupt
> >> controller and implements an irqchip driver to provide a Linux
> >> standard way for the PRU client users to enable/disable/ack/
> >> re-trigger a PRUSS system event. The system events to interrupt
> >> channels and host interrupts relies on the mapping configuration
> >> provided through a firmware resource table for now. This will be
> >> revisited and enhanced in the future for a better interface. The
> >> mappings will currently be programmed during the boot/shutdown
> >> of the PRU.
> >>
> >> The PRUSS INTC module is reference counted during the interrupt
> >> setup phase through the irqchip's irq_request_resources() and
> >> irq_release_resources() ops. This restricts the module from being
> >> removed as long as there are active interrupt users.
> >>
> >> The PRUSS INTC can generate an interrupt to various processor
> >> subsystems on the SoC through a set of 64 possible PRU system
> >> events. These system events can be used by PRU client drivers
> >> or applications for event notifications/signalling between PRUs
> >> and MPU or other processors. An API, pruss_intc_trigger() is
> >> provided to MPU-side PRU client drivers/applications to be able
> >> to trigger an event/interrupt using IRQ numbers provided by the
> >> PRUSS-INTC irqdomain chip.
> > 
> > I suggest you send the binding patch and the interrupt
> > controller driver separately to the irqchip guys. Maybe
> > put the trigger function in to a separate patch that can
> > be reviewed and applied separately.
> 
> Good idea. I will send irqchip related patches separately.

Yes please. But also please document why you have so many non
irq-related entry points in this irqchip driver. It seems to replicate
the same "events vs irq" stuff we're trying to get rid of in the K3
patches...

Thanks,

	M.

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