linux-kernel - Re: [PATCH v2 0/5] Introduce PRU remoteproc consumer API

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Message-ID: <75365443-57e3-e2e0-5865-f78af9d5890b@ti.com>
Date:   Thu, 7 Jan 2021 16:49:29 -0600
From:   Suman Anna <s-anna@...com>
To:     Mathieu Poirier <mathieu.poirier@...aro.org>
CC:     Grzegorz Jaszczyk <grzegorz.jaszczyk@...aro.org>,
        <ohad@...ery.com>, <bjorn.andersson@...aro.org>,
        <robh+dt@...nel.org>, <ssantosh@...nel.org>,
        <linux-remoteproc@...r.kernel.org>, <lee.jones@...aro.org>,
        <devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <linux-omap@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>, <praneeth@...com>,
        <rogerq@...nel.org>
Subject: Re: [PATCH v2 0/5] Introduce PRU remoteproc consumer API

On 1/7/21 4:44 PM, Mathieu Poirier wrote:
> On Wed, Jan 06, 2021 at 06:03:25PM -0600, Suman Anna wrote:
>> Hi Mathieu,
>>
>> On 1/6/21 5:27 PM, Mathieu Poirier wrote:
>>> On Wed, Dec 16, 2020 at 05:52:34PM +0100, Grzegorz Jaszczyk wrote:
>>>> Hi All,
>>>>
>>>> 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.
>>>>
>>>> Patch #3 of this series depends on one not merged remteproc related patch [1].
>>>>
>>>> Please see the individual patches for exact changes in each patch, following is
>>>> the only change from v1:
>>>>  - Change the 'prus' property name to 'ti,prus' as suggested by Rob Herring,
>>>>  which influences patch #1 and patch #2
>>>>
>>>> [1] https://patchwork.kernel.org/project/linux-remoteproc/patch/20201121030156.22857-3-s-anna@ti.com/
>>>>
>>>> Best regards,
>>>> Grzegorz
>>>>
>>>> Roger Quadros (1):
>>>>   remoteproc: pru: Add pru_rproc_set_ctable() function
>>>>
>>>> Suman Anna (2):
>>>>   dt-bindings: remoteproc: Add PRU consumer bindings
>>>>   remoteproc: pru: Deny rproc sysfs ops 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  |  64 +++++
>>>>  drivers/remoteproc/pru_rproc.c                | 221 +++++++++++++++++-
>>>>  include/linux/pruss.h                         |  78 +++++++
>>>
>>> This patchset is giving checkpatch.pl errors and as such will not go further
>>> with this revision.
>>
>> Yeah, I am aware of those. Greg has intentionally skipped the checkpatch
>> warnings around ENOTSUPP, based on some similar discussion on a different patch,
>> https://lkml.org/lkml/2020/11/10/764.
> 
> I only see input from Andy and Lars in the thread you point out, nothing from
> Greg.  I have also taken a look at the patch [1] that made checkpatch complain
> about ENOTSUPP.  From what I see in that commit log the goal is to prevent new
> additions of ENOTSUPP to the kernel.
> 
> Please modify and resend, otherwise I'm sure someone will send another patch to
> fix it before the end of the cycle.

Yeah ok. I will send out a v3.

regards
Suman

> 
> Thanks,
> Mathieu
> 
> [1]. 6b9ea5ff5abd checkpatch: warn about uses of ENOTSUPP
>>
>> Let me know if you prefer that we change these to EOPNOTSUPP.
>>
>> regards
>> Suman
>>
>>>
>>>>  3 files changed, 360 insertions(+), 3 deletions(-)
>>>>  create mode 100644 Documentation/devicetree/bindings/remoteproc/ti,pru-consumer.yaml
>>>>  create mode 100644 include/linux/pruss.h
>>>>
>>>> -- 
>>>> 2.29.0
>>>>
>>