linux-kernel - [PATCH v6 8/8] ARM: sunxi: Add documentation for driver for SD/MMC hosts found on Allwinner sunxi SoCs

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Message-ID: <20140216051223.728.72784.stgit@dizzy-6.o2s.ch>
Date:	Sun, 16 Feb 2014 06:12:26 +0100
From:	David Lanzendörfer <david.lanzendoerfer@....ch>
To:	devicetree@...r.kernel.org, Ulf Hansson <ulf.hansson@...aro.org>,
	Laurent Pinchart <laurent.pinchart+renesas@...asonboard.com>,
	Mike Turquette <mturquette@...aro.org>,
	Simon Baatz <gmbnomis@...il.com>,
	Hans de Goede <hdegoede@...hat.com>,
	Emilio López <emilio@...pez.com.ar>,
	linux-mmc@...r.kernel.org, Chris Ball <chris@...ntf.net>,
	linux-kernel@...r.kernel.org,
	H Hartley Sweeten <hsweeten@...ionengravers.com>,
	linux-sunxi@...glegroups.com, Tejun Heo <tj@...nel.org>,
	Maxime Ripard <maxime.ripard@...e-electrons.com>,
	Guennadi Liakhovetski <g.liakhovetski@....de>,
	linux-arm-kernel@...ts.infradead.org
Subject: [PATCH v6 8/8] ARM: sunxi: Add documentation for driver for SD/MMC
 hosts found on Allwinner sunxi SoCs

Signed-off-by: David Lanzendörfer <david.lanzendoerfer@....ch>
---
 .../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@...0f000 {
+	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";
+};

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