mmci.txt

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    1 * ARM PrimeCell MultiMedia Card Interface (MMCI) PL180/1
    2 
    3 The ARM PrimeCell MMCI PL180 and PL181 provides an interface for
    4 reading and writing to MultiMedia and SD cards alike.
    5 
    6 This file documents differences between the core properties described
    7 by mmc.txt and the properties used by the mmci driver. Using "st" as
    8 the prefix for a property, indicates support by the ST Micro variant.
    9 
   10 Required properties:
   11 - compatible             : contains "arm,pl18x", "arm,primecell".
   12 - vmmc-supply            : phandle to the regulator device tree node, mentioned
   13                            as the VCC/VDD supply in the eMMC/SD specs.
   14 
   15 Optional properties:
   16 - arm,primecell-periphid : contains the PrimeCell Peripheral ID, it overrides
   17                            the ID provided by the HW
   18 - resets                 : phandle to internal reset line.
   19                            Should be defined for sdmmc variant.
   20 - vqmmc-supply           : phandle to the regulator device tree node, mentioned
   21                            as the VCCQ/VDD_IO supply in the eMMC/SD specs.
   22 specific for ux500 variant:
   23 - st,sig-dir-dat0        : bus signal direction pin used for DAT[0].
   24 - st,sig-dir-dat2        : bus signal direction pin used for DAT[2].
   25 - st,sig-dir-dat31       : bus signal direction pin used for DAT[3] and DAT[1].
   26 - st,sig-dir-dat74       : bus signal direction pin used for DAT[4] to DAT[7].
   27 - st,sig-dir-cmd         : cmd signal direction pin used for CMD.
   28 - st,sig-pin-fbclk       : feedback clock signal pin used.
   29 
   30 specific for sdmmc variant:
   31 - reg                    : a second base register may be defined if a delay
   32                            block is present and used for tuning.
   33 - st,sig-dir             : signal direction polarity used for cmd, dat0 dat123.
   34 - st,neg-edge            : data & command phase relation, generated on
   35                            sd clock falling edge.
   36 - st,use-ckin            : use ckin pin from an external driver to sample
   37                            the receive data (example: with voltage
   38                            switch transceiver).
   39 
   40 Deprecated properties:
   41 - mmc-cap-mmc-highspeed  : indicates whether MMC is high speed capable.
   42 - mmc-cap-sd-highspeed   : indicates whether SD is high speed capable.
   43 
   44 Example:
   45 
   46 sdi0_per1@80126000 {
   47         compatible = "arm,pl18x", "arm,primecell";
   48         reg = <0x80126000 0x1000>;
   49         interrupts = <0 60 IRQ_TYPE_LEVEL_HIGH>;
   50 
   51         dmas = <&dma 29 0 0x2>, /* Logical - DevToMem */
   52                <&dma 29 0 0x0>; /* Logical - MemToDev */
   53         dma-names = "rx", "tx";
   54 
   55         clocks = <&prcc_kclk 1 5>, <&prcc_pclk 1 5>;
   56         clock-names = "sdi", "apb_pclk";
   57 
   58         max-frequency = <100000000>;
   59         bus-width = <4>;
   60         cap-sd-highspeed;
   61         cap-mmc-highspeed;
   62         cd-gpios  = <&gpio2 31 0x4>; // 95
   63         st,sig-dir-dat0;
   64         st,sig-dir-dat2;
   65         st,sig-dir-cmd;
   66         st,sig-pin-fbclk;
   67 
   68         vmmc-supply = <&ab8500_ldo_aux3_reg>;
   69         vqmmc-supply = <&vmmci>;
   70 
   71         pinctrl-names = "default", "sleep";
   72         pinctrl-0 = <&sdi0_default_mode>;
   73         pinctrl-1 = <&sdi0_sleep_mode>;
   74 };

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sys/contrib/device-tree/Bindings/mmc/mmci.txt