[PATCH 4/9] dt-bindings: mmc: add binding for BST DWCMSHC SDHCI controller

Albert Yang
2025-09-23T07:26:14Z

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: Albert Yang <yangzh0906@thundersoft.com>

---
Changes for v4:
- Remove Signed-off-by line for Ge Gordon
- Change `$ref: mmc-controller.yaml#` to `$ref: sdhci-common.yaml#`
- Change compatible string from `bst,c1200-dwcmshc-sdhci` to `bst,c1200-sdhci`

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:
- Simplify description, remove redundant paragraphs
- Update $schema to reference mmc-specific scheme
- Correct compatible to add soc name (bst,c1200-dwcmshc-sdhci)
- Remove all redundant property descriptions
- Drop invalid mmc_crm_base/size properties, use reg for all address ranges
- Clean up required properties to only essential entries
- Standardize example DTS format, fix reg syntax and property ordering
- Remove additionalProperties: true
---
.../devicetree/bindings/mmc/bst,dwcmshc-sdhci.yaml | 70 ++++++++++++++++++++++
1 file changed, 70 insertions(+)

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 0000000000000000000000000000000000000000..7f16e6db39690cb7621d167bf7bc492f814ea693
--- /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@bst.ai>
+
+allOf:
+ - $ref: sdhci-common.yaml#
+
+properties:
+ compatible:
+ const: bst,c1200-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@22200000 {
+ 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