[RFC PATCH 2/4] dt-bindings: mmc: arasan: Document 'xlnx,zynqmp-8.9a' controller

[Manish Narani <manish.narani@xilinx.com>]

Add documentation for 'xlnx,zynqmp-8.9a' SDHCI controller and required
properties followed by example.

Signed-off-by: Manish Narani <manish.narani@xilinx.com>
---
 Documentation/devicetree/bindings/mmc/arasan,sdhci.txt | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/Documentation/devicetree/bindings/mmc/arasan,sdhci.txt b/Documentation/devicetree/bindings/mmc/arasan,sdhci.txt
index f6ddba3..72769e0 100644
--- a/Documentation/devicetree/bindings/mmc/arasan,sdhci.txt
+++ b/Documentation/devicetree/bindings/mmc/arasan,sdhci.txt
@@ -15,6 +15,7 @@ Required Properties:
     - "arasan,sdhci-5.1": generic Arasan SDHCI 5.1 PHY
     - "rockchip,rk3399-sdhci-5.1", "arasan,sdhci-5.1": rk3399 eMMC PHY
       For this device it is strongly suggested to include arasan,soc-ctl-syscon.
+    - "xlnx,zynqmp-8.9a", "arasan,sdhci-8.9a": Xilinx ZynqMP Arasan SDHCI 8.9a PHY
   - reg: From mmc bindings: Register location and length.
   - clocks: From clock bindings: Handles to clock inputs.
   - clock-names: From clock bindings: Tuple including "clk_xin" and "clk_ahb"
@@ -24,6 +25,9 @@ Required Properties for "arasan,sdhci-5.1":
   - phys: From PHY bindings: Phandle for the Generic PHY for arasan.
   - phy-names:  MUST be "phy_arasan".
 
+Required Properties for "xlnx,zynqmp-8.9a":
+  - xlnx,device_id: SD controller device ID. Must be either <0> or <1>.
+
 Optional Properties:
   - arasan,soc-ctl-syscon: A phandle to a syscon device (see ../mfd/syscon.txt)
     used to access core corecfg registers.  Offsets of registers in this
@@ -75,3 +79,13 @@ Example:
 		phy-names = "phy_arasan";
 		#clock-cells = <0>;
 	};
+
+	sdhci: sdhci@ff160000 {
+		compatible = "xlnx,zynqmp-8.9a", "arasan,sdhci-8.9a";
+		reg = <0x0 0xff160000 0x0 0x1000>;
+		interrupt-parent = <&gic>;
+		interrupts = <0 48 4>;
+		clock-names = "clk_xin", "clk_ahb";
+		clocks = <&clk 54>, <&clk 31>;
+		xlnx,device_id = <0>;
+	};
-- 
2.1.1