libata, dt: Document sata_rcar bindings

These bindings can be used to register SATA devices found on R-Car SoC.

Signed-off-by: Valentine Barshak <valentine.barshak@cogentembedded.com>
Signed-off-by: Tejun Heo <tj@kernel.org>

diff --git a/Documentation/devicetree/bindings/ata/sata_rcar.txt b/Documentation/devicetree/bindings/ata/sata_rcar.txt
new file mode 100644 (file)
index 0000000..1e61113
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+++ b/Documentation/devicetree/bindings/ata/sata_rcar.txt
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+* Renesas R-Car SATA
+
+Required properties:
+- compatible           : should contain one of the following:
+                         - "renesas,sata-r8a7779" for R-Car H1
+                         - "renesas,sata-r8a7790" for R-Car H2
+                         - "renesas,sata-r8a7791" for R-Car M2
+- reg                  : address and length of the SATA registers;
+- interrupts           : must consist of one interrupt specifier.
+
+Example:
+
+sata: sata@fc600000 {
+       compatible = "renesas,sata-r8a7779";
+       reg = <0xfc600000 0x2000>;
+       interrupt-parent = <&gic>;
+       interrupts = <0 100 IRQ_TYPE_LEVEL_HIGH>;
+};