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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-05-06 01:02:30 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-05-06 01:02:30 +0000
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+* Rockchip specific extensions to the Synopsys Designware Mobile
+ Storage Host Controller
+
+The Synopsys designware mobile storage host controller is used to interface
+a SoC with storage medium such as eMMC or SD/MMC cards. This file documents
+differences between the core Synopsys dw mshc controller properties described
+by synopsys-dw-mshc.txt and the properties used by the Rockchip specific
+extensions to the Synopsys Designware Mobile Storage Host Controller.
+
+Required Properties:
+
+* compatible: should be
+ - "rockchip,rk2928-dw-mshc": for Rockchip RK2928 and following,
+ before RK3288
+ - "rockchip,rk3288-dw-mshc": for Rockchip RK3288
+ - "rockchip,rv1108-dw-mshc", "rockchip,rk3288-dw-mshc": for Rockchip RV1108
+ - "rockchip,px30-dw-mshc", "rockchip,rk3288-dw-mshc": for Rockchip PX30
+ - "rockchip,rk3036-dw-mshc", "rockchip,rk3288-dw-mshc": for Rockchip RK3036
+ - "rockchip,rk3228-dw-mshc", "rockchip,rk3288-dw-mshc": for Rockchip RK322x
+ - "rockchip,rk3328-dw-mshc", "rockchip,rk3288-dw-mshc": for Rockchip RK3328
+ - "rockchip,rk3368-dw-mshc", "rockchip,rk3288-dw-mshc": for Rockchip RK3368
+ - "rockchip,rk3399-dw-mshc", "rockchip,rk3288-dw-mshc": for Rockchip RK3399
+
+Optional Properties:
+* clocks: from common clock binding: if ciu-drive and ciu-sample are
+ specified in clock-names, should contain handles to these clocks.
+
+* clock-names: Apart from the clock-names described in synopsys-dw-mshc.txt
+ two more clocks "ciu-drive" and "ciu-sample" are supported. They are used
+ to control the clock phases, "ciu-sample" is required for tuning high-
+ speed modes.
+
+* rockchip,default-sample-phase: The default phase to set ciu-sample at
+ probing, low speeds or in case where all phases work at tuning time.
+ If not specified 0 deg will be used.
+
+* rockchip,desired-num-phases: The desired number of times that the host
+ execute tuning when needed. If not specified, the host will do tuning
+ for 360 times, namely tuning for each degree.
+
+Example:
+
+ rkdwmmc0@12200000 {
+ compatible = "rockchip,rk3288-dw-mshc";
+ reg = <0x12200000 0x1000>;
+ interrupts = <0 75 0>;
+ #address-cells = <1>;
+ #size-cells = <0>;
+ };