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1 * Rockchip specific extensions to the Synopsys Designware Mobile
2   Storage Host Controller
3
4 The Synopsys designware mobile storage host controller is used to interface
5 a SoC with storage medium such as eMMC or SD/MMC cards. This file documents
6 differences between the core Synopsys dw mshc controller properties described
7 by synopsys-dw-mshc.txt and the properties used by the Rockchip specific
8 extensions to the Synopsys Designware Mobile Storage Host Controller.
9
10 Required Properties:
11
12 * compatible: should be
13         - "rockchip,rk2928-dw-mshc": for Rockchip RK2928 and following,
14                                                         before RK3288
15         - "rockchip,rk3288-dw-mshc": for Rockchip RK3288
16         - "rockchip,rk3036-dw-mshc", "rockchip,rk3288-dw-mshc": for Rockchip RK3036
17         - "rockchip,rk3368-dw-mshc", "rockchip,rk3288-dw-mshc": for Rockchip RK3368
18
19 Optional Properties:
20 * clocks: from common clock binding: if ciu_drive and ciu_sample are
21   specified in clock-names, should contain handles to these clocks.
22
23 * clock-names: Apart from the clock-names described in synopsys-dw-mshc.txt
24   two more clocks "ciu-drive" and "ciu-sample" are supported. They are used
25   to control the clock phases, "ciu-sample" is required for tuning high-
26   speed modes.
27
28 * rockchip,default-sample-phase: The default phase to set ciu_sample at
29   probing, low speeds or in case where all phases work at tuning time.
30   If not specified 0 deg will be used.
31
32 Example:
33
34         rkdwmmc0@12200000 {
35                 compatible = "rockchip,rk3288-dw-mshc";
36                 reg = <0x12200000 0x1000>;
37                 interrupts = <0 75 0>;
38                 #address-cells = <1>;
39                 #size-cells = <0>;
40         };