From: Roger Quadros <rogerq@ti.com>
To: Marc Zyngier <marc.zyngier@arm.com>, Suman Anna <s-anna@ti.com>,
"Davis, Andrew" <afd@ti.com>
Cc: Linus Walleij <linus.walleij@linaro.org>,
Lokesh Vutla <lokeshvutla@ti.com>,
ext Tony Lindgren <tony@atomide.com>,
Ohad Ben-Cohen <ohad@wizery.com>,
Bjorn Andersson <bjorn.andersson@linaro.org>,
David Lechner <david@lechnology.com>,
"Nori, Sekhar" <nsekhar@ti.com>, Tero Kristo <t-kristo@ti.com>,
nsaulnier@ti.com, jreeder@ti.com,
Murali Karicheri <m-karicheri2@ti.com>,
woods.technical@gmail.com,
Linux-OMAP <linux-omap@vger.kernel.org>,
linux-remoteproc@vger.kernel.org,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS"
<devicetree@vger.kernel.or>
Subject: Re: [PATCH v2 01/14] dt-bindings: remoteproc: Add TI PRUSS bindings
Date: Thu, 14 Feb 2019 17:44:36 +0200 [thread overview]
Message-ID: <5C658CE4.5030307@ti.com> (raw)
In-Reply-To: <86ef8asfap.wl-marc.zyngier@arm.com>
On 14/02/19 14:52, Marc Zyngier wrote:
> On Thu, 14 Feb 2019 10:55:10 +0000,
> Roger Quadros <rogerq@ti.com> wrote:
>>
>>
>> On 14/02/19 10:37, Linus Walleij wrote:
>>> On Thu, Feb 14, 2019 at 4:13 AM Suman Anna <s-anna@ti.com> wrote:
>>>> [Me]
>>>
>>>>> To be able to use hierarchical interrupt domain in the kernel, the top
>>>>> interrupt controller must use the hierarchical (v2) irqdomain, so
>>>>> if this is anything else than the ARM GIC it will be an interesting
>>>>> undertaking to handle this.
>>>>
>>>> These are interrupt lines coming towards the host processor running
>>>> Linux and are directly connected to the ARM GIC. This INTC module is
>>>> actually an PRUSS internal interrupt controller that can take in 64 (on
>>>> most SoCs) external events/interrupt sources and multiplexing them
>>>> through two layers of many-to-one events-to-intr channels &
>>>> intr-channels-to-host interrupts. Couple of the host interrupts go to
>>>> the PRU cores themselves while the remaining ones come out of the IP to
>>>> connect to other GICs in the SoC.
>>>
>>> If the muxing is static (like set up once at probe) so that while
>>> the system is running, there is one and one only event mapped to
>>> the GIC from the component below it, then it is hierarchical.
>>
>> This is how it looks.
>>
>> [GIC]<---8---[INTC]<---64---[events from peripherals]
>>
>> The 8 interrupt lines from INTC to the GIC are 1:1 mapped and fixed
>> per SoC. The muxing between 64 inputs to INTC and its 8 outputs are
>> programmable and might not necessarily be static per boot/probe as
>> it depends on what firmware is loaded on the PRU.
>
> But the point is that at any given time, there are at most 8 out of 64
> inputs that are used, right? You *never* end-up with two (or more) of
> these "events" being multiplexed on a single output line.
>
Since the INTC's internal logic allows assigning more than one event each outputs,
at most all 64 events can be assigned to one output or distributed among the 8 outputs.
> If these assertions do hold, then your design is typical of a
> hierarchy, for which we have countless examples in the tree (including
> for some TI HW).
OK.
Suman, Andrew, Lokesh, thoughts?
--
cheers,
-roger
Texas Instruments Finland Oy, Porkkalankatu 22, 00180 Helsinki.
Y-tunnus/Business ID: 0615521-4. Kotipaikka/Domicile: Helsinki
next prev parent reply other threads:[~2019-02-14 15:44 UTC|newest]
Thread overview: 61+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-02-04 14:22 [PATCH v2 00/14] Add support for TI PRU ICSS Roger Quadros
2019-02-04 14:22 ` [PATCH v2 01/14] dt-bindings: remoteproc: Add TI PRUSS bindings Roger Quadros
2019-02-04 16:33 ` Tony Lindgren
2019-02-05 9:39 ` Roger Quadros
2019-02-05 15:08 ` Murali Karicheri
2019-02-05 15:41 ` Roger Quadros
2019-02-05 16:15 ` Murali Karicheri
2019-02-05 16:19 ` Tony Lindgren
2019-02-06 15:04 ` Roger Quadros
2019-02-14 2:47 ` Suman Anna
2019-02-05 16:41 ` Tony Lindgren
2019-02-14 3:01 ` Suman Anna
2019-02-08 13:51 ` Linus Walleij
2019-02-14 3:12 ` Suman Anna
2019-02-14 8:37 ` Linus Walleij
2019-02-14 10:55 ` Roger Quadros
[not found] ` <86ef8asfap.wl-marc.zyngier@arm.com>
2019-02-14 15:44 ` Roger Quadros [this message]
2019-02-14 15:48 ` Roger Quadros
2019-02-15 0:59 ` Suman Anna
2019-02-20 9:51 ` Linus Walleij
2019-02-14 15:51 ` Marc Zyngier
2019-02-14 16:50 ` Roger Quadros
2019-02-14 2:52 ` Suman Anna
2019-02-14 11:08 ` Roger Quadros
2019-02-14 15:56 ` Tony Lindgren
2019-02-15 1:22 ` Suman Anna
2019-02-15 1:08 ` Suman Anna
2019-02-15 13:43 ` Matthijs van Duin
2019-02-04 14:22 ` [PATCH v2 02/14] soc: ti: pruss: Add a platform driver for PRUSS in TI SoCs Roger Quadros
2019-02-04 14:52 ` Andrew F. Davis
2019-02-04 15:32 ` Roger Quadros
2019-02-04 16:35 ` Tony Lindgren
2019-02-04 14:22 ` [PATCH v2 03/14] dt-binding: irqchip: Add pruss-intc-irq driver for PRUSS interrupts Roger Quadros
2019-02-04 16:36 ` Tony Lindgren
2019-02-14 2:40 ` Suman Anna
2019-02-18 19:32 ` Rob Herring
2019-02-04 14:22 ` [PATCH v2 04/14] irqchip: pruss: Add a PRUSS irqchip " Roger Quadros
2019-02-04 15:11 ` Andrew F. Davis
2019-02-04 15:33 ` Roger Quadros
2019-02-05 8:51 ` Roger Quadros
2019-02-14 2:15 ` Suman Anna
2019-02-04 18:15 ` Tony Lindgren
2019-02-05 10:35 ` Roger Quadros
2019-02-05 11:04 ` Marc Zyngier
2019-02-14 2:16 ` Suman Anna
2019-02-04 14:22 ` [PATCH v2 05/14] remoteproc: add map parameter to da_to_va Roger Quadros
2019-02-04 14:22 ` [PATCH v2 06/14] remoteproc: add page lookup for TI PRU to ELF loader Roger Quadros
2019-02-04 15:19 ` Andrew F. Davis
2019-02-14 2:22 ` Suman Anna
2019-02-04 14:22 ` [PATCH v2 07/14] remoteproc: Add a rproc_set_firmware() API Roger Quadros
2019-02-04 14:22 ` [PATCH v2 08/14] remoteproc: Add support to handle device specific resource types Roger Quadros
2019-02-04 14:22 ` [PATCH v2 09/14] dt-binding: remoteproc: Add binding doc for PRU Cores in the PRU-ICSS Roger Quadros
2019-02-18 19:36 ` Rob Herring
2019-02-04 14:22 ` [PATCH v2 10/14] remoteproc/pru: Add PRU remoteproc driver Roger Quadros
2019-02-14 2:35 ` Suman Anna
2019-02-14 3:44 ` Suman Anna
2019-02-04 14:22 ` [PATCH v2 11/14] remoteproc/pru: Add pru_rproc_set_ctable() and pru_rproc_set_gpimode() Roger Quadros
2019-02-04 14:22 ` [PATCH v2 12/14] remoteproc/pru: Add support for virtio rpmsg stack Roger Quadros
2019-02-04 14:22 ` [PATCH v2 13/14] rpmsg: virtio_rpmsg_bus: move back rpmsg_hdr into a public header Roger Quadros
2019-02-04 14:22 ` [PATCH v2 14/14] rpmsg: pru: add a PRU RPMsg driver Roger Quadros
2019-02-04 15:26 ` Andrew F. Davis
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