[PATCH v2 1/2] dt-bindings: mmc: Document Aspeed SD controller

[Andrew Jeffery]

The ASPEED SD/SDIO/eMMC controller exposes two slots implementing the
SDIO Host Specification v2.00, with 1 or 4 bit data buses, or an 8 bit
data bus if only a single slot is enabled.

Signed-off-by: Andrew Jeffery <andrew at aj.id.au>
---
In v2:

* Rename to aspeed,sdhci.yaml
* Rename sd-controller compatible
* Add `maxItems: 1` for reg properties
* Move sdhci subnode description to patternProperties
* Drop sdhci compatible requirement
* #address-cells and #size-cells are required
* Prevent additional properties
* Implement explicit ranges in example
* Remove slot property

 .../devicetree/bindings/mmc/aspeed,sdhci.yaml | 90 +++++++++++++++++++
 1 file changed, 90 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/mmc/aspeed,sdhci.yaml

diff --git a/Documentation/devicetree/bindings/mmc/aspeed,sdhci.yaml b/Documentation/devicetree/bindings/mmc/aspeed,sdhci.yaml
new file mode 100644
index 000000000000..67a691c3348c
--- /dev/null
+++ b/Documentation/devicetree/bindings/mmc/aspeed,sdhci.yaml
@@ -0,0 +1,90 @@
+# SPDX-License-Identifier: GPL-2.0-or-later
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/mmc/aspeed,sdhci.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: ASPEED SD/SDIO/eMMC Controller
+
+maintainers:
+  - Andrew Jeffery <andrew at aj.id.au>
+  - Ryan Chen <ryanchen.aspeed at gmail.com>
+
+description: |+
+  The ASPEED SD/SDIO/eMMC controller exposes two slots implementing the SDIO
+  Host Specification v2.00, with 1 or 4 bit data buses, or an 8 bit data bus if
+  only a single slot is enabled.
+
+  The two slots are supported by a common configuration area. As the SDHCIs for
+  the slots are dependent on the common configuration area, they are described
+  as child nodes.
+
+properties:
+  compatible:
+    enum: [ aspeed,ast2400-sd-controller, aspeed,ast2500-sd-controller ]
+  reg:
+    maxItems: 1
+    description: Common configuration registers
+  ranges: true
+  clocks:
+    maxItems: 1
+    description: The SD/SDIO controller clock gate
+
+patternProperties:
+  "^sdhci@[0-9a-f]+$":
+    type: object
+    properties:
+      compatible:
+        enum: [ aspeed,ast2400-sdhci, aspeed,ast2500-sdhci ]
+      reg:
+        maxItems: 1
+        description: The SDHCI registers
+      clocks:
+        maxItems: 1
+        description: The SD bus clock
+      interrupts:
+        maxItems: 1
+        description: The SD interrupt shared between both slots
+    required:
+      - compatible
+      - reg
+      - clocks
+      - interrupts
+
+additionalProperties: false
+
+required:
+  - compatible
+  - reg
+  - "#address-cells"
+  - "#size-cells"
+  - ranges
+  - clocks
+
+examples:
+  - |
+    #include <dt-bindings/clock/aspeed-clock.h>
+    sdc at 1e740000 {
+            compatible = "aspeed,ast2500-sd-controller";
+            reg = <0x1e740000 0x100>;
+            #address-cells = <1>;
+            #size-cells = <1>;
+            ranges = <0 0x1e740000 0x10000>;
+            clocks = <&syscon ASPEED_CLK_GATE_SDCLK>;
+
+            sdhci0: sdhci at 100 {
+                    compatible = "aspeed,ast2500-sdhci";
+                    reg = <0x100 0x100>;
+                    interrupts = <26>;
+                    sdhci,auto-cmd12;
+                    clocks = <&syscon ASPEED_CLK_SDIO>;
+            };
+
+            sdhci1: sdhci at 200 {
+                    compatible = "aspeed,ast2500-sdhci";
+                    reg = <0x200 0x100>;
+                    interrupts = <26>;
+                    sdhci,auto-cmd12;
+                    clocks = <&syscon ASPEED_CLK_SDIO>;
+            };
+    };
-- 
2.20.1