Each SATA controller should have its own node.
Required properties:
-- compatible : compatible list, one of "snps,spear-ahci",
- "snps,exynos5440-ahci", "ibm,476gtr-ahci",
- "allwinner,sun4i-a10-ahci", "fsl,imx53-ahci"
- "fsl,imx6q-ahci" or "snps,dwc-ahci"
+- compatible : compatible string, one of:
+ - "allwinner,sun4i-a10-ahci"
+ - "fsl,imx53-ahci"
+ - "fsl,imx6q-ahci"
+ - "ibm,476gtr-ahci"
+ - "snps,dwc-ahci"
+ - "snps,exynos5440-ahci"
+ - "snps,spear-ahci"
- interrupts : <interrupt mapping for SATA IRQ>
- reg : <registers mapping>