xref: /linux/Documentation/devicetree/bindings/phy/rockchip,rk3399-emmc-phy.yaml (revision a1ff5a7d78a036d6c2178ee5acd6ba4946243800) 
1# SPDX-License-Identifier: GPL-2.0-only
2%YAML 1.2
3---
4$id: http://devicetree.org/schemas/phy/rockchip,rk3399-emmc-phy.yaml#
5$schema: http://devicetree.org/meta-schemas/core.yaml#
6
7title: Rockchip EMMC PHY
8
9maintainers:
10  - Heiko Stuebner <heiko@sntech.de>
11
12properties:
13  compatible:
14    const: rockchip,rk3399-emmc-phy
15
16  reg:
17    maxItems: 1
18
19  clocks:
20    maxItems: 1
21
22  clock-names:
23    const: emmcclk
24
25  drive-impedance-ohm:
26    $ref: /schemas/types.yaml#/definitions/uint32
27    description:
28      Specifies the drive impedance in Ohm.
29    enum: [33, 40, 50, 66, 100]
30    default: 50
31
32  rockchip,enable-strobe-pulldown:
33    type: boolean
34    description: |
35      Enable internal pull-down for the strobe
36      line.  If not set, pull-down is not used.
37
38  rockchip,output-tapdelay-select:
39    $ref: /schemas/types.yaml#/definitions/uint32
40    description:
41      Specifies the phyctrl_otapdlysec register.
42    default: 0x4
43    maximum: 0xf
44
45  "#phy-cells":
46    const: 0
47
48required:
49  - compatible
50  - reg
51  - "#phy-cells"
52
53additionalProperties: false
54
55examples:
56  - |
57    phy@f780 {
58      compatible = "rockchip,rk3399-emmc-phy";
59      reg = <0xf780 0x20>;
60      clocks = <&sdhci>;
61      clock-names = "emmcclk";
62      drive-impedance-ohm = <50>;
63      #phy-cells = <0>;
64    };
65