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| -rw-r--r-- | Documentation/devicetree/bindings/mmc/rockchip-dw-mshc.txt | 49 |
1 files changed, 49 insertions, 0 deletions
diff --git a/Documentation/devicetree/bindings/mmc/rockchip-dw-mshc.txt b/Documentation/devicetree/bindings/mmc/rockchip-dw-mshc.txt new file mode 100644 index 000000000..6f629b12b --- /dev/null +++ b/Documentation/devicetree/bindings/mmc/rockchip-dw-mshc.txt @@ -0,0 +1,49 @@ +* 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>; + }; |