linux-kernel - Re: [PATCH V3] dt-bindings: nvmem: convert base example to use "nvmem-layout" node

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Date:   Fri, 10 Mar 2023 10:38:57 +0100
From:   Rafał Miłecki <zajec5@...il.com>
To:     Srinivas Kandagatla <srinivas.kandagatla@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Miquel Raynal <miquel.raynal@...tlin.com>,
        Michael Walle <michael@...le.cc>, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Rafał Miłecki <rafal@...ecki.pl>
Subject: Re: [PATCH V3] dt-bindings: nvmem: convert base example to use
 "nvmem-layout" node

On 10.03.2023 10:29, Srinivas Kandagatla wrote:
> 
> 
> On 10/03/2023 07:51, Rafał Miłecki wrote:
>> From: Rafał Miłecki <rafal@...ecki.pl>
>>
>> With support for "fixed-layout" binding we can use now "nvmem-layout"
>> even for fixed NVMEM cells. Use that in the base example as it should be
>> preferred over placing cells directly in the device node.
>>
> Fixed layouts are the core part of nvmem, am not sure why you want to deprecate this. Either we derive the cell information dt or via layouts or some post processing they should still endup as fixed layouts.
> this way the core part is always same irrespective of where the cell info comes from.

I really don't understand why my changes get misunderstood. It's just
happened another time. Yesterday Michael wrote: "your motivation to drop
handling the fixed cells".

Again:
I DON'T deprecate or drop support for fixed layouts (fixed NVMEM cells)
I DON'T deprecate or drop support for fixed layouts (fixed NVMEM cells)

I just want NVMEM bindings to move location of DT fixed NVMEM cells from
*device* node to *nvmem-layout* node.

Also:
I WON'T drop support for old binding. We stay backward compatible.
I WON'T drop support for old binding. We stay backward compatible.


>> New and other bindings should follow as old binding will get deprecated
>> at some point.
>>
>> Signed-off-by: Rafał Miłecki <rafal@...ecki.pl>
>> ---
>>   .../devicetree/bindings/nvmem/nvmem.yaml      | 42 +++++++++++--------
>>   1 file changed, 24 insertions(+), 18 deletions(-)
>>
>> diff --git a/Documentation/devicetree/bindings/nvmem/nvmem.yaml b/Documentation/devicetree/bindings/nvmem/nvmem.yaml
>> index 732162e9d13e..c77be1c20e47 100644
>> --- a/Documentation/devicetree/bindings/nvmem/nvmem.yaml
>> +++ b/Documentation/devicetree/bindings/nvmem/nvmem.yaml
>> @@ -67,24 +67,30 @@ examples:
>>             /* ... */
>> -          /* Data cells */
>> -          tsens_calibration: calib@404 {
>> -              reg = <0x404 0x10>;
>> -          };
>> -
>> -          tsens_calibration_bckp: calib_bckp@504 {
>> -              reg = <0x504 0x11>;
>> -              bits = <6 128>;
>> -          };
>> -
>> -          pvs_version: pvs-version@6 {
>> -              reg = <0x6 0x2>;
>> -              bits = <7 2>;
>> -          };
>> -
>> -          speed_bin: speed-bin@c{
>> -              reg = <0xc 0x1>;
>> -              bits = <2 3>;
>> +          nvmem-layout {
>> +              compatible = "fixed-layout";
>> +              #address-cells = <1>;
>> +              #size-cells = <1>;
>> +
>> +              /* Data cells */
>> +              tsens_calibration: calib@404 {
>> +                  reg = <0x404 0x10>;
>> +              };
>> +
>> +              tsens_calibration_bckp: calib_bckp@504 {
>> +                  reg = <0x504 0x11>;
>> +                  bits = <6 128>;
>> +              };
>> +
>> +              pvs_version: pvs-version@6 {
>> +                  reg = <0x6 0x2>;
>> +                  bits = <7 2>;
>> +              };
>> +
>> +              speed_bin: speed-bin@c{
>> +                  reg = <0xc 0x1>;
>> +                  bits = <2 3>;
>> +              };
>>             };
>>         };