| Tom Rini | 53633a8 | 2024-02-29 12:33:36 -0500 | [diff] [blame^] | 1 | * Amlogic Meson6, Meson8 and Meson8b SDIO/MMC controller |
| 2 | |
| 3 | The highspeed MMC host controller on Amlogic SoCs provides an interface |
| 4 | for MMC, SD, SDIO and SDHC types of memory cards. |
| 5 | |
| 6 | Supported maximum speeds are the ones of the eMMC standard 4.41 as well |
| 7 | as the speed of SD standard 2.0. |
| 8 | |
| 9 | The hardware provides an internal "mux" which allows up to three slots |
| 10 | to be controlled. Only one slot can be accessed at a time. |
| 11 | |
| 12 | Required 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 | |
| 24 | Required child nodes: |
| 25 | A node for each slot provided by the MMC controller is required. |
| 26 | NOTE: due to a driver limitation currently only one slot (= child node) |
| 27 | is supported! |
| 28 | |
| 29 | Required 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 | |
| 33 | Optional 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 | |
| 38 | Examples: |
| 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 | }; |