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dt-bindings: mmc: meson-gx: add dram-access-quirk property

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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@googlemail.com>
Signed-off-by: Neil Armstrong <narmstrong@baylibre.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
This commit is contained in:
Neil Armstrong 2019-05-27 14:43:05 +02:00 committed by Ulf Hansson
parent 754aee5591
commit 5a46b6fa0f
1 changed files with 4 additions and 0 deletions
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Documentation/devicetree/bindings/mmc/amlogic,meson-gx.txt
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@ -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@70000 {