1 * Samsung's SDHCI Controller device tree bindings
3 Samsung's SDHCI controller is used as a connectivity interface with external
4 MMC, SD and eMMC storage mediums. This file documents differences between the
5 core mmc properties described by mmc.txt and the properties used by the
6 Samsung implmentation of the SDHCI controller.
8 Note: The mmc core bindings documentation states that if none of the core
9 card-detect bindings are used, then the standard sdhci card detect mechanism
10 is used. The Samsung's SDHCI controller bindings extends this as listed below.
12 [A] The property "samsung,cd-pinmux-gpio" can be used as stated in the
13 "Optional Board Specific Properties" section below.
15 [B] If core card-detect bindings and "samsung,cd-pinmux-gpio" property
16 is not specified, it is assumed that there is no card detection
19 Required SoC Specific Properties:
20 - compatible: should be one of the following
21 - "samsung,s3c6410-sdhci": For controllers compatible with s3c6410 sdhci
23 - "samsung,exynos4210-sdhci": For controllers compatible with Exynos4 sdhci
26 Required Board Specific Properties:
27 - gpios: Should specify the gpios used for clock, command and data lines. The
28 gpio specifier format depends on the gpio controller.
30 Optional Board Specific Properties:
31 - samsung,cd-pinmux-gpio: Specifies the card detect line that is routed
32 through a pinmux to the card-detect pin of the card slot. This property
33 should be used only if none of the mmc core card-detect properties are
38 compatible = "samsung,exynos4210-sdhci";
39 reg = <0x12530000 0x100>;
40 interrupts = <0 75 0>;
42 cd-gpios = <&gpk2 2 2 3 3>;
43 gpios = <&gpk2 0 2 0 3>, /* clock line */
44 <&gpk2 1 2 0 3>, /* command line */
45 <&gpk2 3 2 3 3>, /* data line 0 */
46 <&gpk2 4 2 3 3>, /* data line 1 */
47 <&gpk2 5 2 3 3>, /* data line 2 */
48 <&gpk2 6 2 3 3>; /* data line 3 */
51 Note: This example shows both SoC specific and board specific properties
52 in a single device node. The properties can be actually be seperated
53 into SoC specific node and board specific node.