linux-kernel - Re: [PATCH v2 1/3] dt-bindings: mmc: meson-gx: add dram-access-quirk property

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Message-ID: <CAPDyKFrDKkDO383buUzkWw_4wX15pNvexbHSvJAxHc-na4PSKw@mail.gmail.com>
Date:   Tue, 28 May 2019 10:53:10 +0200
From:   Ulf Hansson <ulf.hansson@...aro.org>
To:     Neil Armstrong <narmstrong@...libre.com>
Cc:     Kevin Hilman <khilman@...libre.com>,
        DTML <devicetree@...r.kernel.org>,
        "linux-mmc@...r.kernel.org" <linux-mmc@...r.kernel.org>,
        "open list:ARM/Amlogic Meson..." <linux-amlogic@...ts.infradead.org>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Martin Blumenstingl <martin.blumenstingl@...glemail.com>
Subject: Re: [PATCH v2 1/3] dt-bindings: mmc: meson-gx: add dram-access-quirk property

On Mon, 27 May 2019 at 14:43, Neil Armstrong <narmstrong@...libre.com> wrote:
>
> On the Amlogic G12A SoC family, (only) the SDIO controller has a bug which
> makes any DRAM access from the MMC controller fail.
>
> Add the amlogic,dram-access-quirk property so signal this particular
> controller has this bug and needs a quirk to work properly.
>
> Reviewed-by: Martin Blumenstingl <martin.blumenstingl@...glemail.com>
> Signed-off-by: Neil Armstrong <narmstrong@...libre.com>

Applied for next, thanks!

Kind regards
Uffe


> ---
>  Documentation/devicetree/bindings/mmc/amlogic,meson-gx.txt | 4 ++++
>  1 file changed, 4 insertions(+)
>
> diff --git a/Documentation/devicetree/bindings/mmc/amlogic,meson-gx.txt b/Documentation/devicetree/bindings/mmc/amlogic,meson-gx.txt
> index 13e70409e8ac..ccc5358db131 100644
> --- a/Documentation/devicetree/bindings/mmc/amlogic,meson-gx.txt
> +++ b/Documentation/devicetree/bindings/mmc/amlogic,meson-gx.txt
> @@ -22,6 +22,10 @@ Required properties:
>    clock rate requested by the MMC core.
>  - resets     : phandle of the internal reset line
>
> +Optional properties:
> +- amlogic,dram-access-quirk: set when controller's internal DMA engine cannot access the
> +  DRAM memory, like on the G12A dedicated SDIO controller.
> +
>  Example:
>
>         sd_emmc_a: mmc@...00 {
> --
> 2.21.0
>