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-rw-r--r--Documentation/devicetree/bindings/ata/ahci-platform.txt45
1 files changed, 40 insertions, 5 deletions
diff --git a/Documentation/devicetree/bindings/ata/ahci-platform.txt b/Documentation/devicetree/bindings/ata/ahci-platform.txt
index c96d8dcf98fd..4ab09f2202d4 100644
--- a/Documentation/devicetree/bindings/ata/ahci-platform.txt
+++ b/Documentation/devicetree/bindings/ata/ahci-platform.txt
@@ -3,28 +3,43 @@
SATA nodes are defined to describe on-chip Serial ATA controllers.
Each SATA controller should have its own node.
+It is possible, but not required, to represent each port as a sub-node.
+It allows to enable each port independently when dealing with multiple
+PHYs.
+
Required properties:
- compatible : compatible string, one of:
- "allwinner,sun4i-a10-ahci"
- - "fsl,imx53-ahci"
- - "fsl,imx6q-ahci"
- "hisilicon,hisi-ahci"
- "ibm,476gtr-ahci"
- "marvell,armada-380-ahci"
- "snps,dwc-ahci"
- "snps,exynos5440-ahci"
- "snps,spear-ahci"
+ - "generic-ahci"
- interrupts : <interrupt mapping for SATA IRQ>
- reg : <registers mapping>
+Please note that when using "generic-ahci" you must also specify a SoC specific
+compatible:
+ compatible = "manufacturer,soc-model-ahci", "generic-ahci";
+
Optional properties:
- dma-coherent : Present if dma operations are coherent
- clocks : a list of phandle + clock specifier pairs
- target-supply : regulator for SATA target power
+- phys : reference to the SATA PHY node
+- phy-names : must be "sata-phy"
+
+Required properties when using sub-nodes:
+- #address-cells : number of cells to encode an address
+- #size-cells : number of cells representing the size of an address
+
+
+Sub-nodes required properties:
+- reg : the port number
+- phys : reference to the SATA PHY node
-"fsl,imx53-ahci", "fsl,imx6q-ahci" required properties:
-- clocks : must contain the sata, sata_ref and ahb clocks
-- clock-names : must contain "ahb" for the ahb clock
Examples:
sata@ffe08000 {
@@ -40,3 +55,23 @@ Examples:
clocks = <&pll6 0>, <&ahb_gates 25>;
target-supply = <&reg_ahci_5v>;
};
+
+With sub-nodes:
+ sata@f7e90000 {
+ compatible = "marvell,berlin2q-achi", "generic-ahci";
+ reg = <0xe90000 0x1000>;
+ interrupts = <GIC_SPI 7 IRQ_TYPE_LEVEL_HIGH>;
+ clocks = <&chip CLKID_SATA>;
+ #address-cells = <1>;
+ #size-cells = <0>;
+
+ sata0: sata-port@0 {
+ reg = <0>;
+ phys = <&sata_phy 0>;
+ };
+
+ sata1: sata-port@1 {
+ reg = <1>;
+ phys = <&sata_phy 1>;
+ };
+ };