linux-kernel - [PATCH v2 1/2] dt-bindings: synopsys-dw-mshc-common: add "fifo-access-32bit" property

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Date:   Sat, 11 Mar 2023 21:15:37 +0300
From:   Sergey Lisov <sleirsgoevy@...il.com>
To:     Ulf Hansson <ulf.hansson@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Jaehoon Chung <jh80.chung@...sung.com>
Cc:     linux-mmc@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH v2 1/2] dt-bindings: synopsys-dw-mshc-common: add
 "fifo-access-32bit" property

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