dt-bindings: Add devicetree bindings

Add snapshot of device tree bindings from keystone common kernel, branch
"android-mainline-keystone-qcom-release" at c4c12103f9c0 ("Snap for 9228065
from e32903b9a63bb558df8b803b076619c53c16baad to
android-mainline-keystone-qcom-release").

Change-Id: I7682079615cbd9f29340a5c1f2a1d84ec441a1f1
Signed-off-by: Melody Olvera <quic_molvera@quicinc.com>

bindings/mmc/fsl-esdhc.txt

@@ -0,0 +1,52 @@
+* Freescale Enhanced Secure Digital Host Controller (eSDHC)
+
+The Enhanced Secure Digital Host Controller provides an interface
+for MMC, SD, and SDIO types of memory cards.
+
+This file documents differences between the core properties described
+by mmc.txt and the properties used by the sdhci-esdhc driver.
+
+Required properties:
+  - compatible : should be "fsl,esdhc", or "fsl,<chip>-esdhc".
+    Possible compatibles for PowerPC:
+	"fsl,mpc8536-esdhc"
+	"fsl,mpc8378-esdhc"
+	"fsl,p2020-esdhc"
+	"fsl,p4080-esdhc"
+	"fsl,t1040-esdhc"
+	"fsl,t4240-esdhc"
+    Possible compatibles for ARM:
+	"fsl,ls1012a-esdhc"
+	"fsl,ls1028a-esdhc"
+	"fsl,ls1088a-esdhc"
+	"fsl,ls1043a-esdhc"
+	"fsl,ls1046a-esdhc"
+	"fsl,ls2080a-esdhc"
+  - clock-frequency : specifies eSDHC base clock frequency.
+
+Optional properties:
+  - sdhci,wp-inverted : specifies that eSDHC controller reports
+    inverted write-protect state; New devices should use the generic
+    "wp-inverted" property.
+  - sdhci,1-bit-only : specifies that a controller can only handle
+    1-bit data transfers. New devices should use the generic
+    "bus-width = <1>" property.
+  - sdhci,auto-cmd12: specifies that a controller can only handle auto
+    CMD12.
+  - voltage-ranges : two cells are required, first cell specifies minimum
+    slot voltage (mV), second cell specifies maximum slot voltage (mV).
+    Several ranges could be specified.
+  - little-endian : If the host controller is little-endian mode, specify
+    this property. The default endian mode is big-endian.
+
+Example:
+
+sdhci@2e000 {
+	compatible = "fsl,mpc8378-esdhc", "fsl,esdhc";
+	reg = <0x2e000 0x1000>;
+	interrupts = <42 0x8>;
+	interrupt-parent = <&ipic>;
+	/* Filled in by U-Boot */
+	clock-frequency = <0>;
+	voltage-ranges = <3300 3300>;
+};