tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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1* Freescale Enhanced Secure Digital Host Controller (eSDHC)
2
3The Enhanced Secure Digital Host Controller provides an interface
4for MMC, SD, and SDIO types of memory cards.
5
6This file documents differences between the core properties described
7by mmc.txt and the properties used by the sdhci-esdhc driver.
8
9Required properties:
10 - interrupt-parent : interrupt source phandle.
11 - clock-frequency : specifies eSDHC base clock frequency.
12
13Optional properties:
14 - sdhci,wp-inverted : specifies that eSDHC controller reports
15 inverted write-protect state; New devices should use the generic
16 "wp-inverted" property.
17 - sdhci,1-bit-only : specifies that a controller can only handle
18 1-bit data transfers. New devices should use the generic
19 "bus-width = <1>" property.
20 - sdhci,auto-cmd12: specifies that a controller can only handle auto
21 CMD12.
22 - voltage-ranges : two cells are required, first cell specifies minimum
23 slot voltage (mV), second cell specifies maximum slot voltage (mV).
24 Several ranges could be specified.
25 - little-endian : If the host controller is little-endian mode, specify
26 this property. The default endian mode is big-endian.
27
28Example:
29
30sdhci@2e000 {
31 compatible = "fsl,mpc8378-esdhc", "fsl,esdhc";
32 reg = <0x2e000 0x1000>;
33 interrupts = <42 0x8>;
34 interrupt-parent = <&ipic>;
35 /* Filled in by U-Boot */
36 clock-frequency = <0>;
37 voltage-ranges = <3300 3300>;
38};