[PATCH V4][4/4] dt-bindings: mmc: Add dt-bindings for realtek mmc driver

[Jyan Chou <jyanchou@realtek.com>]

Document the device-tree bindings for Realtek SoCs mmc driver.

Signed-off-by: Jyan Chou <jyanchou@realtek.com>

---
v3 -> v4:
- Rename compatible(add SoC-specific part) to be different from filename.
- Describe the items to make properties and item easy to understand.
- Fix examples' indentation and compiling error.
- Drop useless properties.

v2 -> v3:
- Modify dt-bindings' content and description.
- Fix coding style.
- Update the list of maintainers.

v0 -> v2:
- Add dt-bindings.
---
---
 .../bindings/mmc/realtek-dw-mshc.yaml         | 161 ++++++++++++++++++
 1 file changed, 161 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/mmc/realtek-dw-mshc.yaml

diff --git a/Documentation/devicetree/bindings/mmc/realtek-dw-mshc.yaml b/Documentation/devicetree/bindings/mmc/realtek-dw-mshc.yaml
new file mode 100644
index 000000000000..d238cf3b8b47
--- /dev/null
+++ b/Documentation/devicetree/bindings/mmc/realtek-dw-mshc.yaml
@@ -0,0 +1,161 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/mmc/realtek-dw-mshc.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Realtek DesignWare mobile storage host controller
+
+description:
+  Realtek uses the Synopsys DesignWare mobile storage host controller
+  to interface a SoC with storage medium. This file documents the Realtek
+  specific extensions.
+
+allOf:
+  - $ref: synopsys-dw-mshc-common.yaml#
+
+maintainers:
+  - Jyan Chou <jyanchou@realtek.com>
+
+properties:
+  compatible:
+    enum:
+      - realtek,rtd1325-dw-cqe-emmc
+
+  reg:
+    maxItems: 2
+    description:
+      Two regs are required, first reg specifies emmc base address, second reg
+      specifies cqhci base register address.
+
+  reg-names:
+    maxItems: 2
+    items:
+      - const: emmc
+      - const: cqhci
+
+  interrupts:
+    maxItems: 1
+
+  cqe:
+    maxItems: 1
+    description:
+      Cqe should set to 1 while using command queue feature, and set to 0 while
+      in legacy mode.
+
+  clocks:
+    minItems: 2
+    items:
+      - description: bus interface unit clock
+      - description: card interface unit clock
+      - description: select the phase for vpclk0 in realtek chip specified
+      - description: select the phase for vpclk1 in realtek chip specified
+
+  clock-names:
+    minItems: 2
+    items:
+      - const: biu
+      - const: ciu
+      - const: vp0
+      - const: vp1
+
+  resets:
+    maxItems: 1
+
+  reset-names:
+    const: reset
+
+  pinctrl-0:
+    description:
+      should contain default/high speed pin ctrl.
+    maxItems: 1
+
+  pinctrl-1:
+    description:
+      should contain sdr50 mode pin ctrl.
+    maxItems: 1
+
+  pinctrl-2:
+    description:
+      should contain ddr50 mode pin ctrl.
+    maxItems: 1
+
+  pinctrl-3:
+    description:
+      should contain hs200 speed pin ctrl.
+    maxItems: 1
+
+  pinctrl-4:
+    description:
+      should contain hs400 speed pin ctrl.
+    maxItems: 1
+
+  pinctrl-5:
+    description:
+      should contain tune0 pin ctrl.
+    maxItems: 1
+
+  pinctrl-6:
+    description:
+      should contain tune1 pin ctrl.
+    maxItems: 1
+
+  pinctrl-7:
+    description:
+      should contain tune2 pin ctrl.
+    maxItems: 1
+
+  pinctrl-8:
+    description:
+      should contain tune3 pin ctrl.
+    maxItems: 1
+
+  pinctrl-9:
+    description:
+      should contain tune4 pin ctrl.
+    maxItems: 1
+
+  pinctrl-names:
+    maxItems: 10
+
+  required:
+    - compatible
+    - reg
+    - reg-names
+    - interrupts
+    - clocks
+    - clock-names
+    - pinctrl-names
+
+  unevaluatedProperties: false
+
+  examples:
+    - |
+      emmc: mmc@12000 {
+        compatible = "realtek,rtd1325-dw-cqe-emmc";
+        reg = <0x00012000 0x00600>,
+              <0x00012180 0x00060>;
+        reg-names = "emmc", "cqhci";
+        interrupts = <0 42 4>;
+        clocks = <&cc 22>, <&cc 26>, <&cc 121>, <&cc 122>;
+        clock-names = "biu", "ciu", "vp0", "vp1";
+        clock-freq-min-max = <300000 400000000>;
+        clock-frequency = <400000>;
+        vmmc-supply = <&reg_vcc1v8>;
+        resets = <&rst 20>;
+        reset-names = "reset";
+        speed-step = <3>;
+        cqe = <1>;
+        pinctrl-names = "default", "sdr50", "ddr50", "hs200", "hs400",
+                        "tune0","tune1", "tune2","tune3", "tune4";
+        pinctrl-0 = <&emmc_pins_sdr50>;
+        pinctrl-1 = <&emmc_pins_sdr50>;
+        pinctrl-2 = <&emmc_pins_ddr50>;
+        pinctrl-3 = <&emmc_pins_hs200>;
+        pinctrl-4 = <&emmc_pins_hs400>;
+        pinctrl-5 = <&emmc_pins_tune0>;
+        pinctrl-6 = <&emmc_pins_tune1>;
+        pinctrl-7 = <&emmc_pins_tune2>;
+        pinctrl-8 = <&emmc_pins_tune3>;
+        pinctrl-9 = <&emmc_pins_tune4>;
+        };
-- 
2.42.0