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

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Date:   Tue, 5 Feb 2019 12:35:44 +0200
From:   Roger Quadros <rogerq@...com>
To:     Tony Lindgren <tony@...mide.com>
CC:     <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>,
        Marc Zyngier <marc.zyngier@....com>
Subject: Re: [PATCH v2 04/14] irqchip: pruss: Add a PRUSS irqchip driver for
 PRUSS interrupts

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.

cheers,
-roger
> 
> Regards,
> 
> Tony
> 

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