linux-kernel - Re: New remoteproc driver for TI PRU

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Date:   Mon, 6 Aug 2018 11:32:24 -0500
From:   David Lechner <david@...hnology.com>
To:     Suman Anna <s-anna@...com>, Roger Quadros <rogerq@...com>,
        linux-remoteproc@...r.kernel.org, devicetree@...r.kernel.org,
        linux-omap@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
Cc:     Ohad Ben-Cohen <ohad@...ery.com>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Benoît Cousson <bcousson@...libre.com>,
        Tony Lindgren <tony@...mide.com>, Sekhar Nori <nsekhar@...com>,
        Kevin Hilman <khilman@...nel.org>,
        linux-kernel@...r.kernel.org, Tero Kristo <t-kristo@...com>
Subject: Re: New remoteproc driver for TI PRU

On 06/29/2018 07:17 PM, Suman Anna wrote:
> Hi David,
> 
> On 06/29/2018 12:44 PM, David Lechner wrote:
>> On 06/29/2018 04:58 AM, Roger Quadros wrote:
>>> +Suman & Tero
>>>
>>> Hi David,
>>>
>>> On 24/06/18 00:08, David Lechner wrote:
>>>>
>>>> Date: Sat, 23 Jun 2018 15:43:59 -0500
>>>> Subject: [PATCH 0/8] New remoteproc driver for TI PRU
>>>>
>>>> This series adds a new remoteproc driver for the TI Programmable
>>>> Runtime Unit
>>>> (PRU) that is present in some TI Sitara processors. This code has
>>>> been tested
>>>> working on AM1808 (LEGO MINDSTORMS EV3) and AM3358 (BeagleBone Green).
>>>
>>> This is great. We have been working on something similar and I think
>>> it would
>>> be great if we can collaborate to get all our needs addressed.
>>
>> Yes, I have used the PRU with the TI kernel on BeagleBone so I've seen
>> the TI
>> implementation. My primary interest is in the AM1808, which has a far
>> simpler
>> PRU than other SoCs. So, I was hoping I could get away with just
>> implementing
>> the basic stuff that I need and let TI add the more complex stuff later.
> 
> Thanks for the series. PRUSS is present on many SoCs now, and each with
> their own integration quirks, both in terms of SoC connections as well
> as internal sub-modules within the subsystem. We currently support
> AM335x, AM437x, AM57xx, Keystone 2 based 66AK2G and a newer generation
> AM65x as well. It should be relatively straight-forward to scale this
> for AM1808/OMAP-L138 as well. The move to the standard Common Clock and
> Reset frameworks for clocks with the Davinci chips should make it
> relatively straight-forward for the architecture pieces.
> 
> I will take a look at your series in detail sometime next week, and
> mostly post our series to the upstream lists as well within the next
> couple of weeks so that it is easier for discussion on the upstream lists.
> 

Have you had time to look at this yet? If you are too busy, I can submit
a v2 with the interrupt controller broken out into a separate driver.