linux-kernel - Re: [PATCH v2 1/2] dt-bindings: synopsys-dw-mshc-common: add "fifo-access-32bit" property

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <2edea81f-9ea1-5ede-8539-6aac88621670@linaro.org>
Date:   Sun, 12 Mar 2023 11:18:42 +0100
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Sergey Lisov <sleirsgoevy@...il.com>,
        Ulf Hansson <ulf.hansson@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Jaehoon Chung <jh80.chung@...sung.com>
Cc:     linux-mmc@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 1/2] dt-bindings: synopsys-dw-mshc-common: add
 "fifo-access-32bit" property

On 11/03/2023 19:15, Sergey Lisov wrote:
> Some Samsung Exynos boards using the arm64 architecture have DW MMC
> controllers configured for a 32-bit data bus but a 64-bit FIFO. On these
> systems the 64-bit FIFO registers must be accessed in two 32-bit halves.
> ---
>  .../devicetree/bindings/mmc/synopsys-dw-mshc-common.yaml   | 7 +++++++
>  1 file changed, 7 insertions(+)

Missing changelog (I did not get cover letter, so no changelog there
either).

> diff --git a/Documentation/devicetree/bindings/mmc/synopsys-dw-mshc-common.yaml b/Documentation/devicetree/bindings/mmc/synopsys-dw-mshc-common.yaml
> index 8dfad89c7..d025b38ca 100644
> --- a/Documentation/devicetree/bindings/mmc/synopsys-dw-mshc-common.yaml
> +++ b/Documentation/devicetree/bindings/mmc/synopsys-dw-mshc-common.yaml
> @@ -57,6 +57,13 @@ properties:
>        force fifo watermark setting accordingly.
>      $ref: /schemas/types.yaml#/definitions/flag
>  
> +  fifo-access-32bit:
> +    description:
> +      Specifies that this device requires accesses to its 64-bit registers
> +      to be done as pairs of 32-bit accesses, even on architectures where
> +      readq is available.
> +    $ref: /schemas/types.yaml#/definitions/flag

Anyway, I said last time this looks compatible-specific, so I don't
think we need another property.

Best regards,
Krzysztof