[PATCH v8 5/7] Documentation: bindings: document the sub-nodes AHCI bindings

From: Antoine TÃnart
Date: Mon Jun 30 2014 - 09:11:30 EST


The libahci now allows to use multiple PHYs and to represent each port
as a sub-node. Add these bindings to the documentation.

Signed-off-by: Antoine TÃnart <antoine.tenart@xxxxxxxxxxxxxxxxxx>
---
.../devicetree/bindings/ata/ahci-platform.txt | 37 ++++++++++++++++++++++
1 file changed, 37 insertions(+)

diff --git a/Documentation/devicetree/bindings/ata/ahci-platform.txt b/Documentation/devicetree/bindings/ata/ahci-platform.txt
index c96d8dcf98fd..24d95fccfb4a 100644
--- a/Documentation/devicetree/bindings/ata/ahci-platform.txt
+++ b/Documentation/devicetree/bindings/ata/ahci-platform.txt
@@ -3,6 +3,10 @@
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"
@@ -14,6 +18,7 @@ Required properties:
- "snps,dwc-ahci"
- "snps,exynos5440-ahci"
- "snps,spear-ahci"
+ - "generic-ahci"
- interrupts : <interrupt mapping for SATA IRQ>
- reg : <registers mapping>

@@ -21,11 +26,23 @@ 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"

"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

+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
+
+
Examples:
sata@ffe08000 {
compatible = "snps,spear-ahci";
@@ -40,3 +57,23 @@ Examples:
clocks = <&pll6 0>, <&ahb_gates 25>;
target-supply = <&reg_ahci_5v>;
};
+
+With sub-nodes:
+ sata@f7e90000 {
+ compatible = "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>;
+ };
+ };
--
1.9.1

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/