linux-kernel - RE: NVMEM usage consult for device information

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Message-ID: <ce2b064dd28c400fad8dfb0d60b1486e@mtkmbs01n1.mediatek.inc>
Date:   Tue, 18 Feb 2020 09:38:00 +0000
From:   Mac Lu (盧孟德) <mac.lu@...iatek.com>
To:     Srinivas Kandagatla <srinivas.kandagatla@...aro.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-mediatek@...ts.infradead.org" 
        <linux-mediatek@...ts.infradead.org>
CC:     Andrew-CT Chen (陳智迪) 
        <Andrew-CT.Chen@...iatek.com>
Subject: RE: NVMEM usage consult for device information

Hi Srini:
Thanks for your comment.
We would implement the driver and then submit for review.

Thanks
Mac

-----Original Message-----
From: Srinivas Kandagatla [mailto:srinivas.kandagatla@...aro.org] 
Sent: Tuesday, February 18, 2020 5:30 PM
To: Mac Lu (盧孟德) <mac.lu@...iatek.com>; linux-kernel@...r.kernel.org; linux-mediatek@...ts.infradead.org
Cc: Andrew-CT Chen (陳智迪) <Andrew-CT.Chen@...iatek.com>
Subject: Re: NVMEM usage consult for device information



On 18/02/2020 09:26, Mac Lu (盧孟德) wrote:
> Hi Srini:
>>Is this data stored in a non volatile memory on the SoC?
>>if yes, then we should have a proper nvmem provider driver.
> 
> Yes. This data is stored in non volatile memory on the SoC.
It makes sense to have  nvmem driver in that case. which can then be used by Device Tree to retrieve the required configurations from NVMEM.

--srini
> It would be read at bootloader and delivered to kernel by DTB.

> 
> 
> Thanks
> Mac
> 
> -----Original Message-----
> From: Srinivas Kandagatla [mailto:srinivas.kandagatla@...aro.org]
> Sent: Tuesday, February 18, 2020 5:19 PM
> To: Mac Lu (盧孟德) <mac.lu@...iatek.com>; linux-kernel@...r.kernel.org; 
> linux-mediatek@...ts.infradead.org
> Cc: Andrew-CT Chen (陳智迪) <Andrew-CT.Chen@...iatek.com>
> Subject: Re: NVMEM usage consult for device information
> 
> 
> 
> On 18/02/2020 05:16, Mac Lu (盧孟德) wrote:
>> Hello,
>> 
>> Mediatek chip have some SOC configurations and specific data which 
>> would be delivered to kernel by DTB.
>> 
> Is this data stored in a non volatile memory on the SoC?
> if yes, then we should have a proper nvmem provider driver.
> 
> --srini
> 
>> So we want to implement a new NVMEM driver to retrieve these data for 
>> use by the NVMEM Framework.
>> 
>> Do you agree with the usage for our application?
>> 
>> Thanks
>> 
>> Mac
>> 
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