netdev - Re: [EXTERNAL] Re: [EXTERNAL] Re: [PATCH v3 3/6] soc: ti: pruss: Add pruss_cfg

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Message-ID: <a4395259-9b83-1101-7c4c-d8a36c3600eb@ti.com>
Date:   Thu, 9 Mar 2023 17:00:59 +0530
From:   Md Danish Anwar <a0501179@...com>
To:     Roger Quadros <rogerq@...nel.org>,
        MD Danish Anwar <danishanwar@...com>,
        "Andrew F. Davis" <afd@...com>, Suman Anna <s-anna@...com>,
        Vignesh Raghavendra <vigneshr@...com>,
        Mathieu Poirier <mathieu.poirier@...aro.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Santosh Shilimkar <ssantosh@...nel.org>,
        Nishanth Menon <nm@...com>
CC:     <linux-remoteproc@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>, <linux-omap@...r.kernel.org>,
        <srk@...com>, <devicetree@...r.kernel.org>,
        <netdev@...r.kernel.org>
Subject: Re: [EXTERNAL] Re: [EXTERNAL] Re: [PATCH v3 3/6] soc: ti: pruss: Add
 pruss_cfg_read()/update() API

Hi Roger,

On 08/03/23 17:12, Roger Quadros wrote:
> 
> 
> On 08/03/2023 13:36, Md Danish Anwar wrote:
>> Hi Roger,
>>
>> On 08/03/23 13:57, Roger Quadros wrote:
>>> Hi,
>>>
>>> On 06/03/2023 13:09, MD Danish Anwar wrote:
>>>> From: Suman Anna <s-anna@...com>
>>>>
>>>> Add two new generic API pruss_cfg_read() and pruss_cfg_update() to
>>>> the PRUSS platform driver to allow other drivers to read and program
>>>> respectively a register within the PRUSS CFG sub-module represented
>>>> by a syscon driver. This interface provides a simple way for client
>>>
>>> Do you really need these 2 functions to be public?
>>> I see that later patches (4-6) add APIs for doing specific things
>>> and that should be sufficient than exposing entire CFG space via
>>> pruss_cfg_read/update().
>>>
>>>
>>
>> I think the intention here is to keep this APIs pruss_cfg_read() and
>> pruss_cfg_update() public so that other drivers can read / modify PRUSS config
>> when needed.
> 
> Where are these other drivers? If they don't exist then let's not make provision
> for it now.
> We can provide necessary API helpers when needed instead of letting client drivers
> do what they want as they can be misused and hard to debug.
> 

The ICSSG Ethernet driver uses pruss_cfg_update() API. It is posted upstream in
the series [1]. The ethernet driver series is dependent on this series. In
series [1] we are using pruss_cfg_update() in icssg_config.c file,
icssg_config() API.

So for this, the API pruss_cfg_update() needs to be public.

[1] https://lore.kernel.org/all/20230210114957.2667963-3-danishanwar@ti.com/

>>
>> The later patches (4-6) add APIs to do specific thing, but those APIs also
>> eventually call pruss_cfg_read/update().
> 
> They can still call them but they need to be private to pruss.c
> 
>>
>>>> drivers without having them to include and parse the CFG syscon node
>>>> within their respective device nodes. Various useful registers and
>>>> macros for certain register bit-fields and their values have also
>>>> been added.
>>>>
>>>> It is the responsibility of the client drivers to reconfigure or
>>>> reset a particular register upon any failures.
>>>>
>>>> Signed-off-by: Suman Anna <s-anna@...com>
>>>> Co-developed-by: Grzegorz Jaszczyk <grzegorz.jaszczyk@...aro.org>
>>>> Signed-off-by: Grzegorz Jaszczyk <grzegorz.jaszczyk@...aro.org>
>>>> Signed-off-by: Puranjay Mohan <p-mohan@...com>
>>>> ---
>>>>  drivers/soc/ti/pruss.c           |  41 +++++++++++++
>>>>  include/linux/remoteproc/pruss.h | 102 +++++++++++++++++++++++++++++++
>>>>  2 files changed, 143 insertions(+)
>>>>
>>>> diff --git a/drivers/soc/ti/pruss.c b/drivers/soc/ti/pruss.c
>>>> index c8053c0d735f..537a3910ffd8 100644
>>>> --- a/drivers/soc/ti/pruss.c
>>>> +++ b/drivers/soc/ti/pruss.c
>>>> @@ -164,6 +164,47 @@ int pruss_release_mem_region(struct pruss *pruss,
>>>>  }
>>>>  EXPORT_SYMBOL_GPL(pruss_release_mem_region);
>>>
>>> cheers,
>>> -roger
>>

-- 
Thanks and Regards,
Danish.