Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / Documentation / devicetree / bindings / mmc / mmc-spi-slot.txt

diff --git a/kernel/Documentation/devicetree/bindings/mmc/mmc-spi-slot.txt b/kernel/Documentation/devicetree/bindings/mmc/mmc-spi-slot.txt
new file mode 100644 (file)
index 0000000..0e5e2ec
--- /dev/null
+++ b/kernel/Documentation/devicetree/bindings/mmc/mmc-spi-slot.txt
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+MMC/SD/SDIO slot directly connected to a SPI bus
+
+This file documents differences between the core properties described
+by mmc.txt and the properties used by the mmc_spi driver.
+
+Required properties:
+- spi-max-frequency : maximum frequency for this device (Hz).
+- voltage-ranges : two cells are required, first cell specifies minimum
+  slot voltage (mV), second cell specifies maximum slot voltage (mV).
+  Several ranges could be specified.
+
+Optional properties:
+- gpios : may specify GPIOs in this order: Card-Detect GPIO,
+  Write-Protect GPIO. Note that this does not follow the
+  binding from mmc.txt, for historical reasons.
+- interrupt-parent : the phandle for the interrupt controller that
+  services interrupts for this device.
+
+Example:
+
+       mmc-slot@0 {
+               compatible = "fsl,mpc8323rdb-mmc-slot",
+                            "mmc-spi-slot";
+               reg = <0>;
+               gpios = <&qe_pio_d 14 1
+                        &qe_pio_d 15 0>;
+               voltage-ranges = <3300 3300>;
+               spi-max-frequency = <50000000>;
+               interrupts = <42>;
+               interrupt-parent = <&PIC>;
+       };