dt-bindings: mmc: sdhci-am654: Document bindings for the host controllers on TI's...

Add binding documentation for mmc host controllers present on TI's AM654
SOCs.

Signed-off-by: Faiz Abbas <faiz_abbas@ti.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>

diff --git a/Documentation/devicetree/bindings/mmc/sdhci-am654.txt b/Documentation/devicetree/bindings/mmc/sdhci-am654.txt
new file mode 100644 (file)
index 0000000..15dbbba
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+Device Tree Bindings for the SDHCI Controllers present on TI's AM654 SOCs
+
+The bindings follow the mmc[1], clock[2] and interrupt[3] bindings.
+Only deviations are documented here.
+
+  [1] Documentation/devicetree/bindings/mmc/mmc.txt
+  [2] Documentation/devicetree/bindings/clock/clock-bindings.txt
+  [3] Documentation/devicetree/bindings/interrupt-controller/interrupts.txt
+
+Required Properties:
+       - compatible: should be "ti,am654-sdhci-5.1"
+       - reg: Must be two entries.
+               - The first should be the sdhci register space
+               - The second should the subsystem/phy register space
+       - clocks: Handles to the clock inputs.
+       - clock-names: Tuple including "clk_xin" and "clk_ahb"
+       - interrupts: Interrupt specifiers
+       - ti,otap-del-sel: Output Tap Delay select
+       - ti,trm-icp: DLL trim select
+       - ti,driver-strength-ohm: driver strength in ohms.
+                                 Valid values are 33, 40, 50, 66 and 100 ohms.
+
+Example:
+
+       sdhci0: sdhci@4f80000 {
+               compatible = "ti,am654-sdhci-5.1";
+               reg = <0x0 0x4f80000 0x0 0x260>, <0x0 0x4f90000 0x0 0x134>;
+               power-domains = <&k3_pds 47>;
+               clocks = <&k3_clks 47 0>, <&k3_clks 47 1>;
+               clock-names = "clk_ahb", "clk_xin";
+               interrupts = <GIC_SPI 136 IRQ_TYPE_LEVEL_HIGH>;
+               sdhci-caps-mask = <0x80000007 0x0>;
+               mmc-ddr-1_8v;
+               ti,otap-del-sel = <0x2>;
+               ti,trm-icp = <0x8>;
+       };