From 5a46b6fa0f33c2ca7a8432a0a48e1bf4a71fcc9f Mon Sep 17 00:00:00 2001
From: Neil Armstrong <narmstrong@baylibre.com>
Date: Mon, 27 May 2019 14:43:05 +0200
Subject: [PATCH] dt-bindings: mmc: meson-gx: add dram-access-quirk property
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>
---
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 13e70409e8ac6..ccc5358db1316 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@70000 {
--
2.30.2