linux-kernel - Re: [PATCH v3 0/5] Introduce PRU remoteproc consumer API

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Message-ID: <20220428163926.GA2265266@p14s>
Date:   Thu, 28 Apr 2022 10:39:26 -0600
From:   Mathieu Poirier <mathieu.poirier@...aro.org>
To:     Puranjay Mohan <p-mohan@...com>
Cc:     linux-kernel@...r.kernel.org, bjorn.andersson@...aro.org,
        krzysztof.kozlowski+dt@...aro.org,
        linux-remoteproc@...r.kernel.org, devicetree@...r.kernel.org,
        nm@...com, ssantosh@...nel.org, s-anna@...com,
        linux-arm-kernel@...ts.infradead.org, rogerq@...nel.org,
        grygorii.strashko@...com, vigneshr@...com, kishon@...com
Subject: Re: [PATCH v3 0/5] Introduce PRU remoteproc consumer API

On Thu, Apr 28, 2022 at 04:53:22PM +0530, Puranjay Mohan wrote:
> Hi Bjorn,
> Hi Mathieu,
> 
> I am writing to follow up on this patch series.
> This has been on the list for the last 10 days and I have not received
> any comments on it. So, does this look good to everyone?
>

10 days - Euh!

Just to put things in perspective, I am currently reviewing patches that have
been sent around March 16th.

> I had solved the minor checkpatch issues from v2 so I guess this series
> should be good now?
> 
> Looking forward to your comments.
> 
> Thanks
> Puranjay Mohan
> 
> On 18/04/22 16:11, Puranjay Mohan wrote:
> > This is the v3 of the patch series [1]. The v2 had some minor comments
> > which have been addressed here.
> > 
> > I will be posting two more patch series which depend on this series, one to
> > the soc tree and another to the networking tree. I had sent all the 3
> > series, including this one as RFC [2] to get comments and to explain the
> > dependencies.
> > 
> > The Programmable Real-Time Unit and Industrial Communication Subsystem
> > (PRU-ICSS or simply PRUSS) on various TI SoCs consists of dual 32-bit
> > RISC cores (Programmable Real-Time Units, or PRUs) for program execution.
> > 
> > There are 3 foundation components for PRUSS subsystem: the PRUSS platform
> > driver, the PRUSS INTC driver and the PRUSS remoteproc driver. All were
> > already merged and can be found under:
> > 1) drivers/soc/ti/pruss.c
> >    Documentation/devicetree/bindings/soc/ti/ti,pruss.yaml
> > 2) drivers/irqchip/irq-pruss-intc.c
> >    Documentation/devicetree/bindings/interrupt-controller/ti,pruss-intc.yaml
> > 3) drivers/remoteproc/pru_rproc.c
> >    Documentation/devicetree/bindings/remoteproc/ti,pru-rproc.yaml
> > 
> > The programmable nature of the PRUs provide flexibility to implement custom
> > peripheral interfaces, fast real-time responses, or specialized data handling.
> > Example of a PRU consumer drivers will be:
> >   - Software UART over PRUSS
> >   - PRU-ICSS Ethernet EMAC
> > 
> > In order to make usage of common PRU resources and allow the consumer drivers to
> > configure the PRU hardware for specific usage the PRU API is introduced.
> > 
> > [1] https://patchwork.kernel.org/project/linux-remoteproc/cover/20201216165239.2744-1-grzegorz.jaszczyk@linaro.org/
> > [2] https://patchwork.kernel.org/project/linux-remoteproc/cover/20220406094358.7895-1-p-mohan@ti.com/
> > 
> > Thanks,
> > Puranjay Mohan
> > 
> > Roger Quadros (1):
> >   remoteproc: pru: Add pru_rproc_set_ctable() function
> > 
> > Suman Anna (2):
> >   dt-bindings: remoteproc: Add PRU consumer bindings
> >   remoteproc: pru: Make sysfs entries read-only for PRU client driven
> >     boots
> > 
> > Tero Kristo (2):
> >   remoteproc: pru: Add APIs to get and put the PRU cores
> >   remoteproc: pru: Configure firmware based on client setup
> > 
> >  .../bindings/remoteproc/ti,pru-consumer.yaml  |  70 ++++++
> >  drivers/remoteproc/pru_rproc.c                | 234 +++++++++++++++++-
> >  include/linux/pruss.h                         |  78 ++++++
> >  3 files changed, 377 insertions(+), 5 deletions(-)
> >  create mode 100644 Documentation/devicetree/bindings/remoteproc/ti,pru-consumer.yaml
> >  create mode 100644 include/linux/pruss.h
> >