Some Samsung Exynos boards using the arm64 architecture have DW MMC
controllers configured for a 32-bit data bus but a 64-bit FIFO. On these
systems the 64-bit FIFO registers must be accessed in two 32-bit halves.
---
.../devicetree/bindings/mmc/synopsys-dw-mshc-common.yaml | 7 +++++++
1 file changed, 7 insertions(+)
diff --git a/Documentation/devicetree/bindings/mmc/synopsys-dw-mshc-common.yaml b/Documentation/devicetree/bindings/mmc/synopsys-dw-mshc-common.yaml
index 8dfad89c7..d025b38ca 100644
--- a/Documentation/devicetree/bindings/mmc/synopsys-dw-mshc-common.yaml
+++ b/Documentation/devicetree/bindings/mmc/synopsys-dw-mshc-common.yaml
@@ -57,6 +57,13 @@ properties:
force fifo watermark setting accordingly.
$ref: /schemas/types.yaml#/definitions/flag
+ fifo-access-32bit:
+ description:
+ Specifies that this device requires accesses to its 64-bit registers
+ to be done as pairs of 32-bit accesses, even on architectures where
+ readq is available.
+ $ref: /schemas/types.yaml#/definitions/flag
+
dmas:
maxItems: 1
--
2.38.3
