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

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Message-Id: <20190513091548.16674-2-narmstrong@baylibre.com>
Date:   Mon, 13 May 2019 11:15:46 +0200
From:   Neil Armstrong <narmstrong@...libre.com>
To:     ulf.hansson@...aro.org, khilman@...libre.com,
        devicetree@...r.kernel.org
Cc:     baylibre-upstreaming@...ups.io,
        Neil Armstrong <narmstrong@...libre.com>,
        linux-mmc@...r.kernel.org, linux-amlogic@...ts.infradead.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: [PATCH 1/3] dt-bindings: mmc: meson-gx: add ddr-access-quirk property

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@...libre.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.
+
 Example:
 
 	sd_emmc_a: mmc@...00 {
-- 
2.21.0