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

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Date:   Wed, 8 Mar 2023 17:06:52 +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: [PATCH v3 3/6] soc: ti: pruss: Add
 pruss_cfg_read()/update() API

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.

The later patches (4-6) add APIs to do specific thing, but those APIs also
eventually call pruss_cfg_read/update().

>> 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.