diff options
| author | Thomas Abraham <thomas.abraham@linaro.org> | 2012-08-16 22:05:14 +0530 |
|---|---|---|
| committer | Tushar Behera <tushar.behera@linaro.org> | 2012-09-11 11:10:24 +0530 |
| commit | df7e1ba545413effa9763d20c294d69b65a8afc4 (patch) | |
| tree | a9e359d7edc59bb0f4074ae5f36796412e004629 /Documentation | |
| parent | a0e2ad66d7e3ebaad1709412a71d383445bb3707 (diff) | |
mmc: sdhci-s3c: Add device tree support
Add device tree based discovery support for Samsung's sdhci controller
Cc: Ben Dooks <ben-linux@fluff.org>
Cc: Kukjin Kim <kgene.kim@samsung.com>
Cc: Chris Ball <cjb@laptop.org>
Signed-off-by: Thomas Abraham <thomas.abraham@linaro.org>
Diffstat (limited to 'Documentation')
| -rw-r--r-- | Documentation/devicetree/bindings/mmc/samsung-sdhci.txt | 51 |
1 files changed, 51 insertions, 0 deletions
diff --git a/Documentation/devicetree/bindings/mmc/samsung-sdhci.txt b/Documentation/devicetree/bindings/mmc/samsung-sdhci.txt new file mode 100644 index 00000000000..398540be4a2 --- /dev/null +++ b/Documentation/devicetree/bindings/mmc/samsung-sdhci.txt @@ -0,0 +1,51 @@ +* Samsung's SDHCI Controller device tree bindings + +Samsung's SDHCI controller is used as a connectivity interface with external +MMC, SD and eMMC storage mediums. This file documents differences between the +core mmc properties described by mmc.txt and the properties used by the +Samsung implmentation of the SDHCI controller. + +Required SoC Specific Properties: +- compatible: should be one of the following + - "samsung,s3c6410-sdhci": For controllers compatible with s3c6410 sdhci + controller. + - "samsung,exynos4210-sdhci": For controllers compatible with Exynos4 sdhci + controller. + +Required Board Specific Properties: +- gpios: Should specify the gpios used for clock, command and data lines. The + gpio specifier format depends on the gpio controller. + +Optional Board Specific Properties: +- One of the following properties for card detect type. + - samsung,sdhci-cd-internal: Card detect line from the card slot is + connected to the card detect pad of the sdhci controller. A gpio is + used for this connection (with possible pin function settings). + - samsung,sdhci-cd-gpio: A gpio line (with possible pin function settings) + is used a card detect line. This gpio line is not connected to card detect + pad of the sdhci controller. + - samsung,sdhci-cd-none: There is no card detect line. Polling is used to + detect the presence of the card. (DEFAULT, if no card detect property + is specified). + - samsung,sdhci-cd-permanent: There is no card detect line. The card is + permanently connected to the sdhci controller. + +Example: + sdhci@12530000 { + compatible = "samsung,exynos4210-sdhci"; + reg = <0x12530000 0x100>; + interrupts = <<0 75 0>; + bus-width = <4>; + samsung,sdhci-cd-internal; + cd-gpios = <&gpk2 2 2 3 3>; + gpios = <&gpk2 0 2 0 3>, /* clock line */ + <&gpk2 1 2 0 3>, /* command line */ + <&gpk2 3 2 3 3>, /* data line 0 */ + <&gpk2 4 2 3 3>, /* data line 1 */ + <&gpk2 5 2 3 3>, /* data line 2 */ + <&gpk2 6 2 3 3>; /* data line 3 */ + }; + + Note: This example shows both SoC specific and board specific properties + in a single device node. The properties can be actually be seperated + into SoC specific node and board specific node. |