[PATCH v7 8/8] ARM: sunxi: Add documentation for driver for SD/MMC hosts found on Allwinner sunxi SoCs
From: David Lanzendörfer <hidden>
Date: 2014-02-17 10:04:34
Also in:
linux-devicetree, linux-mmc, lkml
Subsystem:
multimedia card (mmc), secure digital (sd) and sdio subsystem, open firmware and flattened device tree bindings, the rest · Maintainers:
Ulf Hansson, Rob Herring, Krzysztof Kozlowski, Conor Dooley, Linus Torvalds
Signed-off-by: David Lanzend?rfer <redacted> --- .../devicetree/bindings/mmc/sunxi-mmc.txt | 32 ++++++++++++++++++++ 1 file changed, 32 insertions(+) create mode 100644 Documentation/devicetree/bindings/mmc/sunxi-mmc.txt
diff --git a/Documentation/devicetree/bindings/mmc/sunxi-mmc.txt b/Documentation/devicetree/bindings/mmc/sunxi-mmc.txt
new file mode 100644
index 0000000..5ce8c5e
--- /dev/null
+++ b/Documentation/devicetree/bindings/mmc/sunxi-mmc.txt@@ -0,0 +1,32 @@ +* Allwinner sunxi MMC controller + +The highspeed MMC host controller on Allwinner SoCs provides an interface +for MMC, SD and SDIO types of memory cards. + +Supported maximum speeds are the ones of the eMMC standard 4.5 as well +as the speed of SD standard 3.0. +Absolute maximum transfer rate is 200MB/s + +Required properties: +- compatible: Should be "allwinner,<revision>-<chip>-mmc". + The supported chips include a10, a10s, 13, a20 and a31. +- base registers are 0x1000 appart, so the base of mmc1 + would be 0x01c0f000+0x1000=0x01c10000(see example) + and so on. +- clocks requires the reference at the ahb clock gate + with the correct index (mmc0 -> 8, mmc1 -> 9, and so on) + as well as the reference to the correct mod0 clock. +- interrupts requires the correct IRQ line + (mmc0 -> 32, mmc1 -> 33, and so on) + +Examples: + +mmc0: mmc at 01c0f000 { + compatible = "allwinner,sun5i-a13-mmc"; + reg = <0x01c0f000 0x1000>; + clocks = <&ahb_gates 8>, <&mmc0_clk>; + clock-names = "ahb", "mod"; + interrupts = <0 32 4>; + bus-width = <4>; + status = "disabled"; +};