linux-kernel - [PATCH v3 4/8] dt-bindings: mmc: add binding for BST DWCMSHC SDHCI controller

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Message-ID: <20250812123110.2090460-5-yangzh0906@thundersoft.com>
Date: Tue, 12 Aug 2025 20:31:06 +0800
From: Albert Yang <yangzh0906@...ndersoft.com>
To: krzk@...nel.org,
	robh@...nel.org,
	krzk+dt@...nel.org,
	conor+dt@...nel.org,
	ulf.hansson@...aro.org,
	catalin.marinas@....com,
	will@...nel.org,
	arnd@...db.de,
	adrian.hunter@...el.com,
	robin.murphy@....com,
	ding.wang@....ai,
	gordon.ge@....ai
Cc: bst-upstream@...ai.top,
	linux-arm-kernel@...ts.infradead.org,
	devicetree@...r.kernel.org,
	linux-mmc@...r.kernel.org,
	soc@...ts.linux.dev,
	linux-kernel@...r.kernel.org,
	Albert Yang <yangzh0906@...ndersoft.com>
Subject: [PATCH v3 4/8] dt-bindings: mmc: add binding for BST DWCMSHC SDHCI controller

Add device tree binding documentation for the Black Sesame Technologies
(BST) DWCMSHC SDHCI controller.

This binding describes the required and optional properties for the
bst,c1200-dwcmshc-sdhci compatible controller, including register layout,
interrupts, bus width, clock configuration, and other controller-specific
features.

Signed-off-by: Ge Gordon <gordon.ge@....ai>
Signed-off-by: Albert Yang <yangzh0906@...ndersoft.com>
---
Changes for v3:
- Switch reg schema from maxItems to explicit items with per-entry
descriptions
- Improve example: add irq.h include and wrap under a bus node with
address/size cells
- Drop status = "disabled" from example; keep example concise
- Add Signed-off-by: Ge Gordon

Changes for v2:
- Simplified description, removed redundant paragraphs
- Updated $schema to reference mmc-specific scheme
- Corrected compatible to add soc name
(bst,c1200-dwcmshc-sdhci)
- Removed all redundant property descriptions
- Dropped invalid mmc_crm_base/size properties, use reg for all address
ranges
- Cleaned up required properties to only essential entries
- Standardized example DTS format, fixed reg syntax and property
ordering
- Removed additionalProperties: true
---
 .../bindings/mmc/bst,dwcmshc-sdhci.yaml       | 70 +++++++++++++++++++
 1 file changed, 70 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/mmc/bst,dwcmshc-sdhci.yaml

diff --git a/Documentation/devicetree/bindings/mmc/bst,dwcmshc-sdhci.yaml b/Documentation/devicetree/bindings/mmc/bst,dwcmshc-sdhci.yaml
new file mode 100644
index 000000000000..aa72ce60259f
--- /dev/null
+++ b/Documentation/devicetree/bindings/mmc/bst,dwcmshc-sdhci.yaml
@@ -0,0 +1,70 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/mmc/bst,dwcmshc-sdhci.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Black Sesame Technologies DWCMSHC SDHCI Controller
+
+maintainers:
+  - Ge Gordon <gordon.ge@....ai>
+
+allOf:
+  - $ref: mmc-controller.yaml#
+
+properties:
+  compatible:
+    const: bst,c1200-dwcmshc-sdhci
+
+  reg:
+    items:
+      - description: Core SDHCI registers
+      - description: CRM registers
+
+  interrupts:
+    maxItems: 1
+
+  clocks:
+    maxItems: 1
+
+  clock-names:
+    items:
+      - const: core
+
+  memory-region:
+    maxItems: 1
+
+  dma-coherent: true
+
+required:
+  - compatible
+  - reg
+  - interrupts
+  - clocks
+  - clock-names
+
+unevaluatedProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/interrupt-controller/arm-gic.h>
+    #include <dt-bindings/interrupt-controller/irq.h>
+
+    bus {
+        #address-cells = <2>;
+        #size-cells = <2>;
+
+        mmc@...00000 {
+            compatible = "bst,c1200-dwcmshc-sdhci";
+            reg = <0x0 0x22200000 0x0 0x1000>,
+                  <0x0 0x23006000 0x0 0x1000>;
+            interrupts = <GIC_SPI 144 IRQ_TYPE_LEVEL_HIGH>;
+            clocks = <&clk_mmc>;
+            clock-names = "core";
+            memory-region = <&mmc0_reserved>;
+            max-frequency = <200000000>;
+            bus-width = <8>;
+            non-removable;
+            dma-coherent;
+        };
+    };
-- 
2.43.0