linux-kernel - Re: [PATCH v2 3/6] dt-bindings: ata: ahci: dwc: enforce rockchip clocks

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Date:   Sun, 4 Jun 2023 22:11:50 +0300
From:   Serge Semin <fancer.lancer@...il.com>
To:     Sebastian Reichel <sebastian.reichel@...labora.com>
Cc:     Heiko Stuebner <heiko@...ech.de>, Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Damien Le Moal <damien.lemoal@...nsource.wdc.com>,
        Vinod Koul <vkoul@...nel.org>,
        Kishon Vijay Abraham I <kishon@...nel.org>,
        linux-ide@...r.kernel.org, linux-phy@...ts.infradead.org,
        linux-rockchip@...ts.infradead.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, kernel@...labora.com
Subject: Re: [PATCH v2 3/6] dt-bindings: ata: ahci: dwc: enforce rockchip
 clocks

On Mon, May 22, 2023 at 07:34:20PM +0200, Sebastian Reichel wrote:
> Provide a specific list of clocks allowed for RK3568 and RK3588
> based DWC AHCI controllers.
> 
> Signed-off-by: Sebastian Reichel <sebastian.reichel@...labora.com>
> ---
>  .../bindings/ata/snps,dwc-ahci.yaml           | 34 +++++++++++++++++--
>  1 file changed, 31 insertions(+), 3 deletions(-)
> 
> diff --git a/Documentation/devicetree/bindings/ata/snps,dwc-ahci.yaml b/Documentation/devicetree/bindings/ata/snps,dwc-ahci.yaml
> index c6a0d6c8b62c..37830185b9b5 100644
> --- a/Documentation/devicetree/bindings/ata/snps,dwc-ahci.yaml
> +++ b/Documentation/devicetree/bindings/ata/snps,dwc-ahci.yaml
> @@ -13,9 +13,6 @@ description:
>    This document defines device tree bindings for the generic Synopsys DWC
>    implementation of the AHCI SATA controller.
>  
> -allOf:
> -  - $ref: snps,dwc-ahci-common.yaml#
> -
>  properties:
>    compatible:
>      oneOf:
> @@ -41,6 +38,37 @@ required:
>    - reg
>    - interrupts
>  
> +allOf:
> +  - $ref: snps,dwc-ahci-common.yaml#
> +  - if:
> +      properties:
> +        compatible:
> +          contains:
> +            enum:
> +              - rockchip,rk3588-dwc-ahci
> +    then:
> +      properties:
> +        clock-names:
> +          items:
> +            - const: sata
> +            - const: pmalive
> +            - const: rxoob
> +            - const: ref
> +            - const: asic
> +  - if:
> +      properties:
> +        compatible:
> +          contains:
> +            enum:
> +              - rockchip,rk3568-dwc-ahci
> +    then:
> +      properties:
> +        clock-names:
> +          items:
> +            - const: sata
> +            - const: pmalive
> +            - const: rxoob
> +

As I already suggested here
https://lore.kernel.org/all/20230421192822.yckihqlk2vlkueyc@mobilestation/
let's create a separate DT-schema for the Rockchip AHCI SATA
controllers. Please see the way it's done for Baikal-T1 AHCI SATA
here: Documentation/devicetree/bindings/ata/baikal,bt1-ahci.yaml
Your generic schema patch doesn't provide a full hardware constraints
(what about resets, number of ports, etc?), but makes the generic
DW AHCI SATA controller DT-schema harder to read.

* Don't forget to add the "select: ..." property to prevent your
DT-schema from being applied to all the "snps,dwc-ahci"-compatible
DT-nodes (see my comment to the previous patchset revision).
Alternatively you can just drop the generic DW AHCI compatible string
from the DT-files (but in this case you would need to add vendor-specific
compatible string to the driver).

-Serge(y)

>  unevaluatedProperties: false
>  
>  examples:
> -- 
> 2.39.2
>