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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>
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Neil Armstrong authored and Ulf Hansson committed Jun 10, 2019
1 parent 754aee5 commit 5a46b6f
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4 changes: 4 additions & 0 deletions Documentation/devicetree/bindings/mmc/amlogic,meson-gx.txt
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Expand Up @@ -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 {
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