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

[Andrew Jeffery <andrew@aj.id.au>]

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@aj.id.au>
---
 .../bindings/mmc/sdhci-of-aspeed.yaml         | 91 +++++++++++++++++++
 1 file changed, 91 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/mmc/sdhci-of-aspeed.yaml

diff --git a/Documentation/devicetree/bindings/mmc/sdhci-of-aspeed.yaml b/Documentation/devicetree/bindings/mmc/sdhci-of-aspeed.yaml
new file mode 100644
index 000000000000..e98a2ac4d46d
--- /dev/null
+++ b/Documentation/devicetree/bindings/mmc/sdhci-of-aspeed.yaml
@@ -0,0 +1,91 @@
+# SPDX-License-Identifier: GPL-2.0-or-later
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/mmc/sdhci-of-aspeed.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: ASPEED SD/SDIO/eMMC Controller
+
+maintainers:
+  - Andrew Jeffery <andrew@aj.id.au>
+  - Ryan Chen <ryanchen.aspeed@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-sdc, aspeed,ast2500-sdc ]
+  reg:
+    description: Common configuration registers
+  ranges: true
+  clocks:
+    maxItems: 1
+    description: The SD/SDIO controller clock gate
+  sdhci:
+    type: object
+    properties:
+      compatible:
+        allOf:
+          - enum: [ aspeed,ast2400-sdhci, aspeed,ast2500-sdhci ]
+          - const: sdhci
+      reg:
+        description: The SDHCI registers
+      clocks:
+        maxItems: 1
+        description: The SD bus clock
+      slot:
+        allOf:
+          - $ref: /schemas/types.yaml#/definitions/uint32
+          - enum: [0, 1]
+      interrupts:
+        maxItems: 1
+        description: The SD interrupt shared between both slots
+    required:
+      - compatible
+      - reg
+      - clocks
+      - slot
+      - interrupts
+
+required:
+  - compatible
+  - reg
+  - ranges
+  - clocks
+
+examples:
+  - |
+    #include <dt-bindings/clock/aspeed-clock.h>
+    sdc at 1e740000 {
+            compatible = "aspeed,ast2500-sdc";
+            reg = <0x1e740000 0x100>;
+            #address-cells = <1>;
+            #size-cells = <1>;
+            ranges;
+            clocks = <&syscon ASPEED_CLK_GATE_SDCLK>;
+
+            sdhci0: sdhci at 1e740100 {
+                    compatible = "aspeed,ast2500-sdhci", "sdhci";
+                    reg = <0x1e740100 0x100>;
+                    slot = <0>;
+                    interrupts = <26>;
+                    sdhci,auto-cmd12;
+                    clocks = <&syscon ASPEED_CLK_SDIO>;
+            };
+
+            sdhci1: sdhci at 1e740200 {
+                    compatible = "aspeed,ast2500-sdhci", "sdhci";
+                    reg = <0x1e740200 0x100>;
+                    slot = <1>;
+                    interrupts = <26>;
+                    sdhci,auto-cmd12;
+                    clocks = <&syscon ASPEED_CLK_SDIO>;
+            };
+    };
-- 
2.20.1