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From: Ulf Hansson <ulf.hansson@linaro.org>
To: Neil Armstrong <narmstrong@baylibre.com>
Cc: Kevin Hilman <khilman@baylibre.com>,
	DTML <devicetree@vger.kernel.org>,
	baylibre-upstreaming@groups.io,
	"linux-mmc@vger.kernel.org" <linux-mmc@vger.kernel.org>,
	"open list:ARM/Amlogic Meson..."
	<linux-amlogic@lists.infradead.org>,
	Linux ARM <linux-arm-kernel@lists.infradead.org>,
	Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH 1/3] dt-bindings: mmc: meson-gx: add ddr-access-quirk property
Date: Wed, 15 May 2019 13:37:29 +0200	[thread overview]
Message-ID: <CAPDyKFr9HVLNpqncs6YhGvqPdXCk6mtVSPVcWDvmnrKiNB+ACQ@mail.gmail.com> (raw)
In-Reply-To: <20190513091548.16674-2-narmstrong@baylibre.com>

On Mon, 13 May 2019 at 11:16, Neil Armstrong <narmstrong@baylibre.com> wrote:
>
> On the Amlogic G12A SoC family, (only) the SDIO controller has a bug which
> makes any DDR access from the MMC controller fail.
>
> Add the amlogic,ddr-access-quirk property so signal this particular
> controller has this bug and needs a quirk to work properly.
>
> Signed-off-by: Neil Armstrong <narmstrong@baylibre.com>
> ---
>  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..f8914dab06c6 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,ddr-access-quirk: set when HW cannot access the DDR memory, like on
> +  the G12A SDIO controller.

As stated on the other patch, may I suggest to use DRAM instead of DDR.

Moreover, please mention that this is about the internal DMA support
of the controller.

> +
>  Example:
>
>         sd_emmc_a: mmc@70000 {
> --
> 2.21.0
>

Kind regards
Uffe

  parent reply	other threads:[~2019-05-15 11:38 UTC|newest]

Thread overview: 19+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-05-13  9:15 [PATCH 0/3] mmc: meson-gx: add ddr-access-quirk support Neil Armstrong
2019-05-13  9:15 ` [PATCH 1/3] dt-bindings: mmc: meson-gx: add ddr-access-quirk property Neil Armstrong
2019-05-14 17:50   ` Martin Blumenstingl
2019-05-15 12:43     ` Neil Armstrong
2019-05-15 11:37   ` Ulf Hansson [this message]
2019-05-15 12:43     ` Neil Armstrong
2019-05-13  9:15 ` [PATCH 2/3] mmc: meson-gx: add ddr-access-quirk Neil Armstrong
2019-05-13 17:47   ` Kevin Hilman
2019-05-14 17:58   ` Martin Blumenstingl
2019-05-15 12:45     ` Neil Armstrong
2019-05-15 21:18       ` Martin Blumenstingl
2019-05-16  9:09         ` Neil Armstrong
2019-05-15 11:34   ` Ulf Hansson
2019-05-15 12:51     ` Neil Armstrong
2019-05-13  9:15 ` [PATCH 3/3] arm64: dts: meson-g12a: add ddr-access-quirk property to SDIO controller Neil Armstrong
2019-05-14 17:51   ` Martin Blumenstingl
2019-05-13  9:58 ` [PATCH 0/3] mmc: meson-gx: add ddr-access-quirk support Jerome Brunet
2019-05-13 11:28   ` Jerome Brunet
2019-05-14  9:14 ` [baylibre-upstreaming] " guillaume La Roque

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