target/linux/brcm2708/patches-4.1/0177-BCM270X_DT-Add-SDIO-overlay.patch

   1 From aea415f55c4844c90edcdff05e355ad5113c68d5 Mon Sep 17 00:00:00 2001
   2 From: Phil Elwell <phil@raspberrypi.org>
   3 Date: Tue, 8 Sep 2015 15:14:50 +0100
   4 Subject: [PATCH 177/222] BCM270X_DT: Add SDIO overlay
   5
   6 Enable SDIO from MMC interface via GPIOs 22-27. Includes the sdhost
   7 overlay to free up the MMC interface.
   8 ---
   9  arch/arm/boot/dts/overlays/Makefile         |  1 +
  10  arch/arm/boot/dts/overlays/README           | 15 +++++++++++++++
  11  arch/arm/boot/dts/overlays/sdio-overlay.dts | 29 +++++++++++++++++++++++++++++
  12  3 files changed, 45 insertions(+)
  13  create mode 100644 arch/arm/boot/dts/overlays/sdio-overlay.dts
  14
  15 --- a/arch/arm/boot/dts/overlays/Makefile
  16 +++ b/arch/arm/boot/dts/overlays/Makefile
  17 @@ -44,6 +44,7 @@ dtb-$(RPI_DT_OVERLAYS) += rpi-ft5406-ove
  18  dtb-$(RPI_DT_OVERLAYS) += rpi-proto-overlay.dtb
  19  dtb-$(RPI_DT_OVERLAYS) += rpi-sense-overlay.dtb
  20  dtb-$(RPI_DT_OVERLAYS) += sdhost-overlay.dtb
  21 +dtb-$(RPI_DT_OVERLAYS) += sdio-overlay.dtb
  22  dtb-$(RPI_DT_OVERLAYS) += spi-bcm2708-overlay.dtb
  23  dtb-$(RPI_DT_OVERLAYS) += spi-bcm2835-overlay.dtb
  24  dtb-$(RPI_DT_OVERLAYS) += spi-dma-overlay.dtb
  25 --- a/arch/arm/boot/dts/overlays/README
  26 +++ b/arch/arm/boot/dts/overlays/README
  27 @@ -513,6 +513,21 @@ Params: overclock_50             Clock (
  28          debug                    Enable debug output (default off)
  29
  30
  31 +Name:   sdio
  32 +Info:   Selects the bcm2835-sdhost SD/MMC driver, optionally with overclock,
  33 +        and enables SDIO via GPIOs 22-27.
  34 +Load:   dtoverlay=sdio,<param>=<val>
  35 +Params: overclock_50             Clock (in MHz) to use when the MMC framework
  36 +                                 requests 50MHz
  37 +
  38 +        force_pio                Disable DMA support (default off)
  39 +
  40 +        pio_limit                Number of blocks above which to use DMA
  41 +                                 (default 1)
  42 +
  43 +        debug                    Enable debug output (default off)
  44 +
  45 +
  46  Name:   spi-bcm2708
  47  Info:   Selects the bcm2708-spi SPI driver
  48  Load:   dtoverlay=spi-bcm2708
  49 --- /dev/null
  50 +++ b/arch/arm/boot/dts/overlays/sdio-overlay.dts
  51 @@ -0,0 +1,29 @@
  52 +/* Enable SDIO from MMC interface via GPIOs 22-27. Includes sdhost overlay. */
  53 +
  54 +/include/ "sdhost-overlay.dts"
  55 +
  56 +/{
  57 +       compatible = "brcm,bcm2708";
  58 +
  59 +       fragment@3 {
  60 +               target = <&mmc>;
  61 +               __overlay__ {
  62 +                       compatible = "brcm,bcm2835-mmc";
  63 +                       pinctrl-names = "default";
  64 +                       pinctrl-0 = <&sdio_pins>;
  65 +                       non-removable;
  66 +                       status = "okay";
  67 +               };
  68 +       };
  69 +
  70 +       fragment@4 {
  71 +               target = <&gpio>;
  72 +               __overlay__ {
  73 +                       sdio_pins: sdio_pins {
  74 +                               brcm,pins = <22 23 24 25 26 27>;
  75 +                               brcm,function = <7 7 7 7 7 7>; /* ALT3 = SD1 */
  76 +                               brcm,pull = <0 2 2 2 2 2>;
  77 +                       };
  78 +               };
  79 +       };
  80 +};