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

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Date:   Fri, 10 Mar 2023 17:23:44 +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 09/03/23 17:00, Md Danish Anwar wrote:
> 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/
> 

I will keep this patch as it is as pruss_cfg_update() needs to be public for
ICSSG Ethernet driver and pruss_cfg_read() is kind of a complementary function
to update. I will do required changes in other patches and send next revision
if that's OK with you. Please let me know.

>>>
>>> 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.