linux-kernel - [PATCH v2] dt-bindings: mmc: vt8500-sdmmc: Convert to YAML

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Message-Id: <20250423-vt8500-sdmmc-binding-v2-1-ea4f17fd0638@gmail.com>
Date: Wed, 23 Apr 2025 14:53:29 +0400
From: Alexey Charkov <alchark@...il.com>
To: Ulf Hansson <ulf.hansson@...aro.org>, Rob Herring <robh@...nel.org>, 
 Krzysztof Kozlowski <krzk+dt@...nel.org>, 
 Conor Dooley <conor+dt@...nel.org>
Cc: linux-mmc@...r.kernel.org, devicetree@...r.kernel.org, 
 linux-kernel@...r.kernel.org, Alexey Charkov <alchark@...il.com>
Subject: [PATCH v2] dt-bindings: mmc: vt8500-sdmmc: Convert to YAML

Rewrite the textual description for the WonderMedia SDMMC controller
as YAML schema, and switch the filename to follow the compatible
string.

Signed-off-by: Alexey Charkov <alchark@...il.com>
---
Split the series from v1 into separate bindings patches so as not to
spam all the subsystems with unrelated changes, per Rob's suggestion

Changes in v2:
- described the sdon-inverted property in greater detail (thanks Rob)
- dropped the hunk that updates MAINTAINERS for easier merging - will
  be updated later in a single pass to cover all VT8500 related files

Link to v1: https://lore.kernel.org/all/20250416-wmt-updates-v1-3-f9af689cdfc2@gmail.com/
---
 .../devicetree/bindings/mmc/vt8500-sdmmc.txt       | 23 --------
 .../devicetree/bindings/mmc/wm,wm8505-sdhc.yaml    | 66 ++++++++++++++++++++++
 2 files changed, 66 insertions(+), 23 deletions(-)

diff --git a/Documentation/devicetree/bindings/mmc/vt8500-sdmmc.txt b/Documentation/devicetree/bindings/mmc/vt8500-sdmmc.txt
deleted file mode 100644
index d7fb6abb3eb8c87e698ca4f30270c949878f3cbf..0000000000000000000000000000000000000000
--- a/Documentation/devicetree/bindings/mmc/vt8500-sdmmc.txt
+++ /dev/null
@@ -1,23 +0,0 @@
-* Wondermedia WM8505/WM8650 SD/MMC Host Controller
-
-This file documents differences between the core properties described
-by mmc.txt and the properties used by the wmt-sdmmc driver.
-
-Required properties:
-- compatible: Should be "wm,wm8505-sdhc".
-- interrupts: Two interrupts are required - regular irq and dma irq.
-
-Optional properties:
-- sdon-inverted: SD_ON bit is inverted on the controller
-
-Examples:
-
-sdhc@...0a000 {
-	compatible = "wm,wm8505-sdhc";
-	reg = <0xd800a000 0x1000>;
-	interrupts = <20 21>;
-	clocks = <&sdhc>;
-	bus-width = <4>;
-	sdon-inverted;
-};
-
diff --git a/Documentation/devicetree/bindings/mmc/wm,wm8505-sdhc.yaml b/Documentation/devicetree/bindings/mmc/wm,wm8505-sdhc.yaml
new file mode 100644
index 0000000000000000000000000000000000000000..5b55174e908836866fbba42336db94cb03f9137b
--- /dev/null
+++ b/Documentation/devicetree/bindings/mmc/wm,wm8505-sdhc.yaml
@@ -0,0 +1,66 @@
+# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/mmc/wm,wm8505-sdhc.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: WonderMedia SoC SDHCI Controller
+
+maintainers:
+  - Alexey Charkov <alchark@...il.com>
+
+allOf:
+  - $ref: mmc-controller.yaml#
+
+properties:
+  compatible:
+    oneOf:
+      - const: wm,wm8505-sdhc
+      - items:
+          - const: wm,wm8650-sdhc
+          - const: wm,wm8505-sdhc
+      - items:
+          - const: wm,wm8750-sdhc
+          - const: wm,wm8505-sdhc
+      - items:
+          - const: wm,wm8850-sdhc
+          - const: wm,wm8505-sdhc
+
+  reg:
+    maxItems: 1
+
+  clocks:
+    maxItems: 1
+
+  interrupts:
+    items:
+      - description: SDMMC controller interrupt
+      - description: SDMMC controller DMA interrupt
+
+  sdon-inverted:
+    type: boolean
+    description: All chips before (not including) WM8505 rev. A2 treated their
+      "clock stop" bit (register offset 0x08 a.k.a. SDMMC_BUSMODE, bit 0x10)
+      as "set 1 to disable SD clock", while all the later versions treated it
+      as "set 0 to disable SD clock". Set this property for later versions of
+      wm,wm8505-sdhc. On wm,wm8650-sdhc and later this property is implied and
+      does not need to be set explicitly
+
+required:
+  - compatible
+  - reg
+  - interrupts
+  - clocks
+
+unevaluatedProperties: false
+
+examples:
+  - |
+    mmc@...0a000 {
+        compatible = "wm,wm8505-sdhc";
+        reg = <0xd800a000 0x1000>;
+        interrupts = <20>, <21>;
+        clocks = <&sdhc>;
+        bus-width = <4>;
+        sdon-inverted;
+    };

---
base-commit: 0af2f6be1b4281385b618cb86ad946eded089ac8
change-id: 20250423-vt8500-sdmmc-binding-01c6ce3f6678

Best regards,
-- 
Alexey Charkov <alchark@...il.com>