[PATCH v4] dt-bindings: phy: rockchip-emmc-phy: Convert to dtschema

[Shresth Prasad]

Convert txt bindings of Rockchip EMMC PHY to dtschema to allow
for validation.

Signed-off-by: Shresth Prasad <shresthprasad7 at gmail.com>
---
Request for an Ack from the PHY maintainers, so that the DT maintainer Heiko 
can merge it to grf.yaml in the order that he likes.

Changes in v4:
    - change license to `GPL-2.0-only`
    - change dt-binding file name
    - remove descriptions
    - move `#phy-cells` to the bottom
    - add Heiko to maintainers
    - fix `patternProperties` regex in grf.yaml
    - change `description` to `$ref` in grf.yaml

Tested against `rockchip/rk3399-firefly.dtb`, `rockchip/rk3399-orangepi.dtb`
and `rockchip/rk3399-pinebook-pro.dtb`.
---
 .../phy/rockchip,rk3399-emmc-phy.yaml         | 72 +++++++++++++++++++
 .../bindings/phy/rockchip-emmc-phy.txt        | 43 -----------
 .../devicetree/bindings/soc/rockchip/grf.yaml |  9 ++-
 3 files changed, 78 insertions(+), 46 deletions(-)
 create mode 100644 Documentation/devicetree/bindings/phy/rockchip,rk3399-emmc-phy.yaml
 delete mode 100644 Documentation/devicetree/bindings/phy/rockchip-emmc-phy.txt

diff --git a/Documentation/devicetree/bindings/phy/rockchip,rk3399-emmc-phy.yaml b/Documentation/devicetree/bindings/phy/rockchip,rk3399-emmc-phy.yaml
new file mode 100644
index 000000000000..e61ba2b0abcd
--- /dev/null
+++ b/Documentation/devicetree/bindings/phy/rockchip,rk3399-emmc-phy.yaml
@@ -0,0 +1,72 @@
+# SPDX-License-Identifier: GPL-2.0-only
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/phy/rockchip,rk3399-emmc-phy.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Rockchip EMMC PHY
+
+maintainers:
+  - Heiko Stuebner <heiko at sntech.de>
+  - Shresth Prasad <shresthprasad7 at gmail.com>
+
+properties:
+  compatible:
+    const: rockchip,rk3399-emmc-phy
+
+  reg:
+    maxItems: 1
+
+  clock-names:
+    const: emmcclk
+
+  clocks:
+    maxItems: 1
+
+  drive-impedance-ohm:
+    $ref: /schemas/types.yaml#/definitions/uint32
+    description:
+      Specifies the drive impedance in Ohm.
+    enum: [33, 40, 50, 66, 100]
+    default: 50
+
+  rockchip,enable-strobe-pulldown:
+    type: boolean
+    description: |
+      Enable internal pull-down for the strobe
+      line.  If not set, pull-down is not used.
+
+  rockchip,output-tapdelay-select:
+    $ref: /schemas/types.yaml#/definitions/uint32
+    description:
+      Specifies the phyctrl_otapdlysec register.
+    default: 0x4
+    maximum: 0xf
+
+  "#phy-cells":
+    const: 0
+
+required:
+  - compatible
+  - reg
+  - "#phy-cells"
+
+additionalProperties: false
+
+examples:
+  - |
+    grf: syscon at ff770000 {
+      compatible = "rockchip,rk3399-grf", "syscon", "simple-mfd";
+      reg = <0xff770000 0x10000>;
+      #address-cells = <1>;
+      #size-cells = <1>;
+
+      emmcphy: phy at f780 {
+        compatible = "rockchip,rk3399-emmc-phy";
+        reg = <0xf780 0x20>;
+        clocks = <&sdhci>;
+        clock-names = "emmcclk";
+        drive-impedance-ohm = <50>;
+        #phy-cells = <0>;
+      };
+    };
diff --git a/Documentation/devicetree/bindings/phy/rockchip-emmc-phy.txt b/Documentation/devicetree/bindings/phy/rockchip-emmc-phy.txt
deleted file mode 100644
index 57d28c0d5696..000000000000
--- a/Documentation/devicetree/bindings/phy/rockchip-emmc-phy.txt
+++ /dev/null
@@ -1,43 +0,0 @@
-Rockchip EMMC PHY
------------------------
-
-Required properties:
- - compatible: rockchip,rk3399-emmc-phy
- - #phy-cells: must be 0
- - reg: PHY register address offset and length in "general
-   register files"
-
-Optional properties:
- - clock-names: Should contain "emmcclk".  Although this is listed as optional
-		(because most boards can get basic functionality without having
-		access to it), it is strongly suggested.
-		See ../clock/clock-bindings.txt for details.
- - clocks: Should have a phandle to the card clock exported by the SDHCI driver.
- - drive-impedance-ohm: Specifies the drive impedance in Ohm.
-                        Possible values are 33, 40, 50, 66 and 100.
-                        If not set, the default value of 50 will be applied.
- - rockchip,enable-strobe-pulldown: Enable internal pull-down for the strobe
-                                    line.  If not set, pull-down is not used.
- - rockchip,output-tapdelay-select: Specifies the phyctrl_otapdlysec register.
-                                    If not set, the register defaults to 0x4.
-                                    Maximum value 0xf.
-
-Example:
-
-
-grf: syscon at ff770000 {
-	compatible = "rockchip,rk3399-grf", "syscon", "simple-mfd";
-	#address-cells = <1>;
-	#size-cells = <1>;
-
-...
-
-	emmcphy: phy at f780 {
-		compatible = "rockchip,rk3399-emmc-phy";
-		reg = <0xf780 0x20>;
-		clocks = <&sdhci>;
-		clock-names = "emmcclk";
-		drive-impedance-ohm = <50>;
-		#phy-cells = <0>;
-	};
-};
diff --git a/Documentation/devicetree/bindings/soc/rockchip/grf.yaml b/Documentation/devicetree/bindings/soc/rockchip/grf.yaml
index 79798c747476..6e1b1cdea680 100644
--- a/Documentation/devicetree/bindings/soc/rockchip/grf.yaml
+++ b/Documentation/devicetree/bindings/soc/rockchip/grf.yaml
@@ -176,9 +176,12 @@ allOf:
             Documentation/devicetree/bindings/phy/rockchip-pcie-phy.txt
 
       patternProperties:
-        "phy@[0-9a-f]+$":
-          description:
-            Documentation/devicetree/bindings/phy/rockchip-emmc-phy.txt
+        "^phy@[0-9a-f]+$":
+          type: object
+
+          $ref: /schemas/phy/rockchip,rk3399-emmc-phy.yaml#
+
+          unevaluatedProperties: false
 
   - if:
       properties:
-- 
2.45.2