Subject: Re: [PATCH v2 02/14] dt-bindings: spi: Add bcmbca-hsspi controller
 support
To:     Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>,
        Linux SPI List <linux-spi@vger.kernel.org>,
        Broadcom Kernel List <bcm-kernel-feedback-list@broadcom.com>
Cc:     tomer.yacoby@broadcom.com, kursad.oney@broadcom.com,
        dregan@mail.com, f.fainelli@gmail.com, anand.gore@broadcom.com,
        jonas.gorski@gmail.com, dan.beygelman@broadcom.com,
        joel.peshkin@broadcom.com,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@linaro.org>,
        Mark Brown <broonie@kernel.org>,
        Rob Herring <robh+dt@kernel.org>, devicetree@vger.kernel.org,
        linux-kernel@vger.kernel.org
References: <20230124221218.341511-1-william.zhang@broadcom.com>
 <20230124221218.341511-3-william.zhang@broadcom.com>
 <abedd2e8-3c7e-f347-06af-99f2e5a2412b@linaro.org>
From:   William Zhang <william.zhang@broadcom.com>
Message-ID: <ee4727e1-5705-edb0-c724-2ae4d4d1a8e2@broadcom.com>
Date:   Wed, 25 Jan 2023 11:23:52 -0800
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On 01/24/2023 11:35 PM, Krzysztof Kozlowski wrote:
> On 24/01/2023 23:12, William Zhang wrote:
>> The new Broadcom Broadband BCMBCA SoCs includes a updated HSSPI
>> controller. Add new compatible strings to differentiate the old and new
>> controller while keeping MIPS based chip with the old compatible. Update
>> property requirements for these two revisions of the controller.  Also
>> add myself and Kursad as the maintainers.
>>
>> Signed-off-by: William Zhang <william.zhang@broadcom.com>
>>
>> ---
>>
>> Changes in v2:
>> - Update new compatible string to follow Broadcom convention <chip
>> specific compatible>, <version of the IP>, <fallback>
>> - Add reg-names min/maxItem constraints to be consistent with reg
>> property
>> - Make interrupts required property
>> - Remove double quote from spi-controller.yaml reference
>> - Remove brcm,use-cs-workaround flag
>> - Update the example with new compatile and interrupts property
>> - Update commit message
>>
>>   .../bindings/spi/brcm,bcm63xx-hsspi.yaml      | 106 +++++++++++++++++-
>>   1 file changed, 101 insertions(+), 5 deletions(-)
>>
>> diff --git a/Documentation/devicetree/bindings/spi/brcm,bcm63xx-hsspi.yaml b/Documentation/devicetree/bindings/spi/brcm,bcm63xx-hsspi.yaml
>> index d1a0c9adee7a..d39604654c9e 100644
>> --- a/Documentation/devicetree/bindings/spi/brcm,bcm63xx-hsspi.yaml
>> +++ b/Documentation/devicetree/bindings/spi/brcm,bcm63xx-hsspi.yaml
>> @@ -4,20 +4,73 @@
>>   $id: http://devicetree.org/schemas/spi/brcm,bcm63xx-hsspi.yaml#
>>   $schema: http://devicetree.org/meta-schemas/core.yaml#
>>   
>> -title: Broadcom BCM6328 High Speed SPI controller
>> +title: Broadcom Broadband SoC High Speed SPI controller
>>   
>>   maintainers:
>> +
> 
> This is a friendly reminder during the review process.
> 
> It seems my previous comments were not fully addressed. Maybe my
> feedback got lost between the quotes, maybe you just forgot to apply it.
> Please go back to the previous discussion and either implement all
> requested changes or keep discussing them.
> 
> Thank you.
> 
Yeah I forgot to remove the blank line after maintainers tag.  Also 
regarding the explanation of dummy cs workaround flag,  we decided to 
remove it as it is not necessary after discussion internally and with 
SPI maintainer Mark. Let me know if I missed anything else.

>> +  - William Zhang <william.zhang@broadcom.com>
>> +  - Kursad Oney <kursad.oney@broadcom.com>
>>     - Jonas Gorski <jonas.gorski@gmail.com>
>>   
>> -allOf:
>> -  - $ref: spi-controller.yaml#
> 
> In your previous patch, put it already in desired place (after
> "required:"), so you will not have to shuffle it.
> 
Will update the previous patch in v3

>> +description: |
>> +  Broadcom Broadband SoC supports High Speed SPI master controller since the
>> +  early MIPS based chips such as BCM6328 and BCM63268.  This initial rev 1.0
>> +  controller was carried over to recent ARM based chips, such as BCM63138,
>> +  BCM4908 and BCM6858. The old MIPS based chip should continue to use the
>> +  brcm,bcm6328-hsspi compatible string. The recent ARM based chip is required to
>> +  use the brcm,bcmbca-hsspi-v1.0 as part of its compatible string list as
>> +  defined below to match the specific chip along with ip revision info.
>> +
>> +  This rev 1.0 controller has a limitation that can not keep the chip select line
>> +  active between the SPI transfers within the same SPI message. This can
>> +  terminate the transaction to some SPI devices prematurely. The issue can be
>> +  worked around by either the controller's prepend mode or using the dummy chip
>> +  select workaround. Driver automatically picks the suitable mode based on
>> +  transfer type so it is transparent to the user.
>> +
>> +  The newer SoCs such as BCM6756, BCM4912 and BCM6855 include an updated SPI
>> +  controller rev 1.1 that add the capability to allow the driver to control chip
>> +  select explicitly. This solves the issue in the old controller.
>>   
>>   properties:
>>     compatible:
>> -    const: brcm,bcm6328-hsspi
>> +    oneOf:
>> +      - const: brcm,bcm6328-hsspi
>> +      - items:
>> +          - enum:
>> +              - brcm,bcm47622-hsspi
>> +              - brcm,bcm4908-hsspi
>> +              - brcm,bcm63138-hsspi
>> +              - brcm,bcm63146-hsspi
>> +              - brcm,bcm63148-hsspi
>> +              - brcm,bcm63158-hsspi
>> +              - brcm,bcm63178-hsspi
>> +              - brcm,bcm6846-hsspi
>> +              - brcm,bcm6856-hsspi
>> +              - brcm,bcm6858-hsspi
>> +              - brcm,bcm6878-hsspi
>> +          - const: brcm,bcmbca-hsspi-v1.0
>> +          - const: brcm,bcmbca-hsspi
> 
> Why do you need "brcm,bcmbca-hsspi"? Nothing binds to it, so it's
> useless and very generic.
> 
This was from Florian's suggestion and Broadcom's convention. See [1] 
and you are okay with that [2].  I added the rev compatible and you were 
not objecting it finally if I understand you correctly.

>> +      - items:
>> +          - enum:
>> +              - brcm,bcm4912-hsspi
>> +              - brcm,bcm6756-hsspi
>> +              - brcm,bcm6813-hsspi
>> +              - brcm,bcm6855-hsspi
>> +          - const: brcm,bcmbca-hsspi-v1.1
>> +          - const: brcm,bcmbca-hsspi
> 
> Same here.
> 
>>   
>>     reg:
>> -    maxItems: 1
>> +    items:
>> +      - description: main registers
>> +      - description: miscellaneous control registers
>> +    minItems: 1
>> +
>> +  reg-names:
>> +    items:
>> +      - const: hsspi
>> +      - const: spim-ctrl
>> +    minItems: 1
>>   
>>     clocks:
>>       items:
>> @@ -39,10 +92,39 @@ required:
>>     - clock-names
>>     - interrupts
>>   
>> +allOf:
>> +  - $ref: spi-controller.yaml#
>> +  - if:
>> +      properties:
>> +        compatible:
>> +          contains:
>> +            enum:
>> +              - brcm,bcm6328-hsspi
>> +              - brcm,bcmbca-hsspi-v1.0
>> +    then:
>> +      properties:
>> +        reg:
>> +          minItems: 1
> 
> drop minItems
> 
Will fix in v3 and the next one as well

>> +          maxItems: 1
>> +        reg-names:
>> +          minItems: 1
> 
> drop minItems
> 
>> +          maxItems: 1
>> +    else:
>> +      properties:
>> +        reg:
>> +          minItems: 2
>> +          maxItems: 2
>> +        reg-names:
>> +          minItems: 2
>> +          maxItems: 2
>> +      required:
>> +        - reg-names
>> +
>>   unevaluatedProperties: false
>>   
>>   examples:
>>     - |
>> +    #include <dt-bindings/interrupt-controller/arm-gic.h>
>>       spi@10001000 {
>>           compatible = "brcm,bcm6328-hsspi";
>>           reg = <0x10001000 0x600>;
>> @@ -53,3 +135,17 @@ examples:
>>           #address-cells = <1>;
>>           #size-cells = <0>;
>>       };
>> +  - |
>> +    spi@ff801000 {
>> +        compatible = "brcm,bcm6756-hsspi", "brcm,bcmbca-hsspi-v1.1",
>> +                     "brcm,bcmbca-hsspi";
>> +        reg = <0xff801000 0x1000>,
>> +              <0xff802610 0x4>;
>> +        reg-names = "hsspi", "spim-ctrl";
>> +        interrupts = <GIC_SPI 36 IRQ_TYPE_LEVEL_HIGH>;
>> +        clocks = <&hsspi>, <&hsspi_pll>;
>> +        clock-names = "hsspi", "pll";
>> +        num-cs = <8>;
>> +        #address-cells = <1>;
>> +        #size-cells = <0>;
>> +    };
> 
> Drop new example - the difference is only in reg. Or change old example
> to have only one (newer, more complex).
> 
Will replace the old example with this more recent and complex example in v3

> Best regards,
> Krzysztof
> 

[1] https://www.spinics.net/lists/devicetree/msg565016.html
[2] https://www.spinics.net/lists/devicetree/msg565197.html

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