linux-kernel - Re: [PATCH v9 04/15] dt-bindings: spi: dw: Add AMD Pensando Elba SoC SPI Controller bindings

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Date:   Tue, 24 Jan 2023 13:26:15 -0800
From:   Brad Larson <blarson@....com>
To:     <krzysztof.kozlowski@...aro.org>
CC:     <adrian.hunter@...el.com>, <alcooperx@...il.com>,
        <andy.shevchenko@...il.com>, <arnd@...db.de>, <blarson@....com>,
        <brad@...sando.io>, <brendan.higgins@...ux.dev>,
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Subject: Re: [PATCH v9 04/15] dt-bindings: spi: dw: Add AMD Pensando Elba SoC SPI Controller bindings

On 24/01/2023 7:55 UTC, Krzysztof Kozlowski wrote:
>On 24/01/2023 02:57, Brad Larson wrote:
>> On 19/01/2023 7:55 UTC, Krzysztof Kozlowski wrote:
>>> On 19/01/2023 04:51, Brad Larson wrote:
>>>> The AMD Pensando Elba SoC has integrated the DW APB SPI Controller
>>>>
>> ...
>>>>  .../devicetree/bindings/spi/snps,dw-apb-ssi.yaml   | 14 ++++++++++++++
>>>>  1 file changed, 14 insertions(+)
>>>>
>>>> diff --git a/Documentation/devicetree/bindings/spi/snps,dw-apb-ssi.yaml b/Documentation/devicetree/bindings/spi/snps,dw-apb-ssi.yaml
>>>> index d33b72fabc5d..96b072835de0 100644
>>>> --- a/Documentation/devicetree/bindings/spi/snps,dw-apb-ssi.yaml
>>>> +++ b/Documentation/devicetree/bindings/spi/snps,dw-apb-ssi.yaml
>>>> @@ -37,6 +37,18 @@ allOf:
>>>>      else:
>>>>        required:
>>>>          - interrupts
>>>> +  - if:
>>>> +      properties:
>>>> +        compatible:
>>>> +          contains:
>>>> +            const: amd,pensando-elba-spi
>>>> +    then:
>>>> +      properties:
>>>> +        amd,pensando-elba-syscon:
>>>> +          $ref: /schemas/types.yaml#/definitions/phandle-array
>>>> +          description: AMD Pensando Elba SoC system controller
>>>
>>> And nothing here - neither in commit msg nor here - explains why do you
>>> need it and what is it for.
>> 
>> Adding property amd,pensando-elba-syscon was a result of this thread:
>> https://lore.kernel.org/lkml/20220621101159.stvan53rvr6qugna@mobilestation/
>> 
>
> But it is not in the code. The code should tell what the property does,
> what is its purpose, how it is used etc. Your property description
> basically copies the name without giving any new information.

Yes, I looked past the description, thanks.  See below the updated description
and added amd,pensando-elba-syscon definition to top level properties.  The
property is added to the end as I see partial alphabetical ordering.

--- a/Documentation/devicetree/bindings/spi/snps,dw-apb-ssi.yaml
+++ b/Documentation/devicetree/bindings/spi/snps,dw-apb-ssi.yaml
@@ -37,6 +37,17 @@ allOf:
     else:
       required:
         - interrupts
+  - if:
+      properties:
+        compatible:
+          contains:
+            const: amd,pensando-elba-spi
+    then:
+      required:
+        - amd,pensando-elba-syscon
+    else:
+      properties:
+        amd,pensando-elba-syscon: false
 
 properties:
   compatible:
@@ -63,6 +74,8 @@ properties:
         const: intel,keembay-ssi
       - description: Intel Thunder Bay SPI Controller
         const: intel,thunderbay-ssi
+      - description: AMD Pensando Elba SoC SPI Controller
+        const: amd,pensando-elba-spi
       - description: Baikal-T1 SPI Controller
         const: baikal,bt1-ssi
       - description: Baikal-T1 System Boot SPI Controller
@@ -136,6 +149,12 @@ properties:
       of the designware controller, and the upper limit is also subject to
       controller configuration.
 
+  amd,pensando-elba-syscon:
+    $ref: /schemas/types.yaml#/definitions/phandle-array
+    description: |
+      Block address to control four spi chip-selects.  The Elba SoC
+      does not use ssi.
+
 patternProperties:
   "^.*@[0-9a-f]+$":
     type: object

Regards,
Brad