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1* Amlogic Meson6, Meson8 and Meson8b SDIO/MMC controller2 3The highspeed MMC host controller on Amlogic SoCs provides an interface4for MMC, SD, SDIO and SDHC types of memory cards.5 6Supported maximum speeds are the ones of the eMMC standard 4.41 as well7as the speed of SD standard 2.0.8 9The hardware provides an internal "mux" which allows up to three slots10to be controlled. Only one slot can be accessed at a time.11 12Required properties:13 - compatible : must be one of14 - "amlogic,meson8-sdio"15 - "amlogic,meson8b-sdio"16 along with the generic "amlogic,meson-mx-sdio"17 - reg : mmc controller base registers18 - interrupts : mmc controller interrupt19 - #address-cells : must be 120 - size-cells : must be 021 - clocks : phandle to clock providers22 - 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") ID32 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 parameters36 please refer to mmc.txt within this directory37 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