linux-kernel - Re: [PATCH] ARM: dts: am335x: Add PRU system events for virtio

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Date: Mon, 6 May 2024 17:09:33 -0500
From: Judith Mendez <jm@...com>
To: <linux-omap@...r.kernel.org>
CC: <devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        Krzysztof
 Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley
	<conor+dt@...nel.org>, Tony Lindgren <tony@...mide.com>,
        Rob Herring
	<robh@...nel.org>,
        Benoît Cousson <bcousson@...libre.com>
Subject: Re: [PATCH] ARM: dts: am335x: Add PRU system events for virtio

Hi all,

On 5/1/24 2:41 PM, Judith Mendez wrote:
> From: Nick Saulnier <nsaulnier@...com>
> 
> A PRU system event "vring" has been added to each of the PRU nodes in
> the PRU-ICSS remote processor subsystem to enable the virtio/rpmsg
> communication between MPU and that PRU core. The additions are done
> in the base am33xx-l4.dtsi, and so are inherited by all the AM335x
> boards. Do note that PRUSS is available only on all AM3356+ SoCs.
> 
> The PRU system events is the preferred approach over using OMAP
> mailboxes, as it eliminates an external peripheral access from
> the PRU-side, and keeps the interrupt generation internal to the
> PRUSS. The difference from MPU would be minimal in using one
> versus the other.
> 
> Mailboxes can still be used if desired, but currently there is no
> support on firmware-side for the SoC to use mailboxes. Either approach
> would require that an appropriate firmware image is loaded/booted on
> the PRU.

Please ignore this patch,

Thanks,
Judith