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BCM270X_DT: Add SDIO overlay

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Enable SDIO from MMC interface via GPIOs 22-27. Includes the sdhost
overlay to free up the MMC interface.
This commit is contained in:
Phil Elwell
2015-09-08 15:14:50 +01:00
parent 5a63610f1e
commit c8baa9702c
3 changed files with 45 additions and 0 deletions
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1
arch/arm/boot/dts/overlays/Makefile
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@@ -44,6 +44,7 @@ dtb-$(RPI_DT_OVERLAYS) += rpi-ft5406-overlay.dtb
dtb-$(RPI_DT_OVERLAYS) += rpi-proto-overlay.dtb
dtb-$(RPI_DT_OVERLAYS) += rpi-sense-overlay.dtb
dtb-$(RPI_DT_OVERLAYS) += sdhost-overlay.dtb
dtb-$(RPI_DT_OVERLAYS) += sdio-overlay.dtb
dtb-$(RPI_DT_OVERLAYS) += spi-bcm2708-overlay.dtb
dtb-$(RPI_DT_OVERLAYS) += spi-bcm2835-overlay.dtb
dtb-$(RPI_DT_OVERLAYS) += spi-dma-overlay.dtb

15
arch/arm/boot/dts/overlays/README
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@@ -513,6 +513,21 @@ Params: overclock_50 Clock (in MHz) to use when the MMC framework
debug Enable debug output (default off)
Name: sdio
Info: Selects the bcm2835-sdhost SD/MMC driver, optionally with overclock,
and enables SDIO via GPIOs 22-27.
Load: dtoverlay=sdio,<param>=<val>
Params: overclock_50 Clock (in MHz) to use when the MMC framework
requests 50MHz
force_pio Disable DMA support (default off)
pio_limit Number of blocks above which to use DMA
(default 1)
debug Enable debug output (default off)
Name: spi-bcm2708
Info: Selects the bcm2708-spi SPI driver
Load: dtoverlay=spi-bcm2708

29
arch/arm/boot/dts/overlays/sdio-overlay.dts Normal file
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@@ -0,0 +1,29 @@
/* Enable SDIO from MMC interface via GPIOs 22-27. Includes sdhost overlay. */
/include/ "sdhost-overlay.dts"
/{
compatible = "brcm,bcm2708";
fragment@3 {
target = <&mmc>;
__overlay__ {
compatible = "brcm,bcm2835-mmc";
pinctrl-names = "default";
pinctrl-0 = <&sdio_pins>;
non-removable;
status = "okay";
};
};
fragment@4 {
target = <&gpio>;
__overlay__ {
sdio_pins: sdio_pins {
brcm,pins = <22 23 24 25 26 27>;
brcm,function = <7 7 7 7 7 7>; /* ALT3 = SD1 */
brcm,pull = <0 2 2 2 2 2>;
};
};
};
};