[PATCH V5][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>

---
v4 -> v5:
- Fix compatible to match filename.
- Remove unused property, e.g.,cqe, resets, clock-freq-min-max.
- Fix indentation.

v3 -> v4:
- 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.

v1 -> v2:
- Add dt-bindings.
---
 .../bindings/mmc/realtek,rtd-dw-cqe-emmc.yaml | 157 ++++++++++++++++++
 1 file changed, 157 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/mmc/realtek,rtd-dw-cqe-emmc.yaml

diff --git a/Documentation/devicetree/bindings/mmc/realtek,rtd-dw-cqe-emmc.yaml b/Documentation/devicetree/bindings/mmc/realtek,rtd-dw-cqe-emmc.yaml
new file mode 100644
index 000000000000..f422a216ff93
--- /dev/null
+++ b/Documentation/devicetree/bindings/mmc/realtek,rtd-dw-cqe-emmc.yaml
@@ -0,0 +1,157 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/mmc/realtek,rtd-dw-cqe-emmc.yaml#
+$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.
+
+maintainers:
+  - Jyan Chou <jyanchou@realtek.com>
+
+allOf:
+  - $ref: mmc-controller.yaml#
+
+properties:
+  compatible:
+    enum:
+      - realtek,rtd-dw-cqe-emmc
+
+  reg:
+    items:
+      - description: emmc base address
+      - description: cqhci base address
+
+  reg-names:
+    items:
+      - const: emmc
+      - const: cqhci
+
+  interrupts:
+    maxItems: 1
+
+  clocks:
+    description: Handles to input clocks
+
+  clock-names:
+    items:
+      - const: biu
+      - const: ciu
+      - const: vp0
+      - const: vp1
+
+  clock-frequency:
+    description:
+      Operating frequency of realtek emmc controller clock
+    minimum: 300000
+    maximum: 400000000
+
+  vmmc-supply:
+    description:
+      Handle to fixed-voltage supply for the card power.
+
+  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
+  - clock-frequency
+  - vmmc-supply
+  - pinctrl-names
+  - pinctrl-0
+  - pinctrl-1
+  - pinctrl-3
+  - pinctrl-4
+  - pinctrl-5
+  - pinctrl-6
+  - pinctrl-7
+  - pinctrl-8
+  - pinctrl-9
+
+additionalProperties: false
+
+examples:
+  - |
+    emmc: mmc@12000 {
+      compatible = "realtek,rtd-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-frequency = <400000>;
+      vmmc-supply = <&reg_vcc1v8>;
+      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