arch/arm/boot/dts/overlays/sdio-1bit-overlay.dts

   1 /dts-v1/;
   2 /plugin/;
   3
   4 /* Enable 1-bit SDIO from MMC interface via GPIOs 22-25. Includes sdhost overlay. */
   5
   6 /{
   7         compatible = "brcm,bcm2708";
   8
   9         fragment@0 {
  10                 target = <&mmc>;
  11                 __overlay__ {
  12                         status = "disabled";
  13                 };
  14         };
  15
  16         fragment@1 {
  17                 target = <&soc>;
  18                 __overlay__ {
  19                         #address-cells = <1>;
  20                         #size-cells = <1>;
  21
  22                         sdio_1bit: sdio@7e300000 {
  23                                 compatible = "brcm,bcm2835-mmc",
  24                                              "brcm,bcm2835-sdhci";
  25                                 reg = <0x7e300000 0x100>;
  26                                 interrupts = <2 30>;
  27                                 clocks = <&clocks 28/*BCM2835_CLOCK_EMMC*/>;
  28                                 dmas = <&dma 11>;
  29                                 dma-names = "rx-tx";
  30                                 brcm,overclock-50 = <0>;
  31                                 status = "okay";
  32                                 pinctrl-names = "default";
  33                                 pinctrl-0 = <&sdio_1bit_pins>;
  34                                 non-removable;
  35                                 bus-width = <1>;
  36                         };
  37                 };
  38         };
  39
  40         fragment@2 {
  41                 target = <&gpio>;
  42                 __overlay__ {
  43                         sdio_1bit_pins: sdio_1bit_pins {
  44                                 brcm,pins = <22 23 24 25>;
  45                                 brcm,function = <7>; /* ALT3 = SD1 */
  46                                 brcm,pull = <0 2 2 2>;
  47                         };
  48                 };
  49         };
  50
  51         fragment@3 {
  52                 target-path = "/aliases";
  53                 __overlay__ {
  54                         mmc1 = "/soc/sdio@7e300000";
  55                 };
  56         };
  57
  58
  59         __overrides__ {
  60                 poll_once = <&sdio_1bit>,"non-removable?";
  61                 sdio_overclock = <&sdio_1bit>,"brcm,overclock-50:0";
  62         };
  63 };