[PATCH V2][4/4] mmc: Add dt-bindings for realtek mmc driver

[Jyan Chou <jyanchou@xxxxxxxxxxx>]

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

Signed-off-by: Jyan Chou <jyanchou@xxxxxxxxxxx>

---
v0 -> v2:
- Add dt-binding.
---
---
 .../bindings/mmc/realtek-dw-mshc.yaml         | 119 ++++++++++++++++++
 1 file changed, 119 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..f398a595c5c5
--- /dev/null
+++ b/Documentation/devicetree/bindings/mmc/realtek-dw-mshc.yaml
@@ -0,0 +1,119 @@
+# 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@xxxxxxxxxxx>
+
+# Everything else is described in the common file
+properties:
+  compatible:
+    enum:
+      - realtek,rtd-dw-cqe-emmc
+  reg:
+    maxItems: 1
+
+  interrupts:
+    maxItems: 1
+
+  clocks:
+    minItems: 2
+    maxItems: 4
+    description:
+      Handle to "biu" and "ciu" clocks for the bus interface unit clock and
+      the card interface unit clock.
+
+  clock-names:
+    minItems: 2
+    items:
+      - const: biu
+      - const: ciu
+      - const: vp0
+      - const: vp1
+    description:
+      "vp0" and "vp1" are used to control the clock phases.
+
+  power-domains:
+    maxItems: 1
+
+  resets:
+    maxItems: 1
+
+  reset-names:
+    const: reset
+
+  speed-step:
+    maxItems: 1
+    description:
+	"speed-step" represents the bus speed mode of emmc. "3" means HS400,
+	"2" means HS200, "0" means HS.
+
+  pinctrl-names:
+    maxItems: 10
+    items:
+      - const: default
+      - const: sdr50
+      - const: ddr50
+      - const: hs200
+      - const: hs400
+      - const: tune0
+      - const: tune1
+      - const: tune2
+      - const: tune3
+      - const: tune4
+
+required:
+  - compatible
+  - reg
+  - interrupts
+  - clocks
+  - clock-names
+  - pinctrl-names
+  - pinctrl
+
+unevaluatedProperties: false
+
+examples:
+  - |
+    emmc: emmc@12000 {
+        compatible = "realtek,rtd-dw-cqe-emmc";
+        reg = <0x00012000 0x00600>,
+		<0x00012180 0x00060>;
+        reg-names = "emmc","cqhci";
+        interrupts = <0 42 4>;
+        clocks = <&cc RTD1319D_CRT_CLK_EN_EMMC>,
+		<&cc RTD1319D_CRT_CLK_EN_EMMC_IP>,
+                <&cc RTD1319D_CRT_PLL_EMMC_VP0>,
+                <&cc RTD1319D_CRT_PLL_EMMC_VP1>;
+        clock-names = "biu", "ciu", "vp0", "vp1";
+        clock-freq-min-max = <300000 400000000>;
+        clock-frequency = <400000>;
+        vmmc-supply = <&reg_vcc1v8>;
+        resets = <&cc RTD1319D_CRT_RSTN_EMMC>;
+        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