tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
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linux
1MMC/SD/SDIO slot directly connected to a SPI bus
2
3This file documents differences between the core properties described
4by mmc.txt and the properties used by the mmc_spi driver.
5
6Required properties:
7- spi-max-frequency : maximum frequency for this device (Hz).
8- voltage-ranges : two cells are required, first cell specifies minimum
9 slot voltage (mV), second cell specifies maximum slot voltage (mV).
10 Several ranges could be specified.
11
12Optional properties:
13- gpios : may specify GPIOs in this order: Card-Detect GPIO,
14 Write-Protect GPIO. Note that this does not follow the
15 binding from mmc.txt, for historical reasons.
16
17Example:
18
19 mmc-slot@0 {
20 compatible = "fsl,mpc8323rdb-mmc-slot",
21 "mmc-spi-slot";
22 reg = <0>;
23 gpios = <&qe_pio_d 14 1
24 &qe_pio_d 15 0>;
25 voltage-ranges = <3300 3300>;
26 spi-max-frequency = <50000000>;
27 interrupts = <42>;
28 interrupt-parent = <&PIC>;
29 };