1* Amlogic Meson6, Meson8 and Meson8b SDIO/MMC controller 2 3The highspeed MMC host controller on Amlogic SoCs provides an interface 4for MMC, SD, SDIO and SDHC types of memory cards. 5 6Supported maximum speeds are the ones of the eMMC standard 4.41 as well 7as the speed of SD standard 2.0. 8 9The hardware provides an internal "mux" which allows up to three slots 10to be controlled. Only one slot can be accessed at a time. 11 12Required properties: 13 - compatible : must be one of 14 - "amlogic,meson8-sdio" 15 - "amlogic,meson8b-sdio" 16 along with the generic "amlogic,meson-mx-sdio" 17 - reg : mmc controller base registers 18 - interrupts : mmc controller interrupt 19 - #address-cells : must be 1 20 - size-cells : must be 0 21 - clocks : phandle to clock providers 22 - clock-names : must contain "core" and "clkin" 23 24Required child nodes: 25A node for each slot provided by the MMC controller is required. 26NOTE: due to a driver limitation currently only one slot (= child node) 27 is supported! 28 29Required properties on each child node (= slot): 30 - compatible : must be "mmc-slot" (see mmc.txt within this directory) 31 - reg : the slot (or "port") ID 32 33Optional properties on each child node (= slot): 34 - bus-width : must be 1 or 4 (8-bit bus is not supported) 35 - for cd and all other additional generic mmc parameters 36 please refer to mmc.txt within this directory 37 38Examples: 39 mmc@c1108c20 { 40 compatible = "amlogic,meson8-sdio", "amlogic,meson-mx-sdio"; 41 reg = <0xc1108c20 0x20>; 42 interrupts = <0 28 1>; 43 #address-cells = <1>; 44 #size-cells = <0>; 45 clocks = <&clkc CLKID_SDIO>, <&clkc CLKID_CLK81>; 46 clock-names = "core", "clkin"; 47 48 slot@1 { 49 compatible = "mmc-slot"; 50 reg = <1>; 51 52 bus-width = <4>; 53 }; 54 }; 55