From 724f24ee651c59aa3f42a8ea2d441cfac5015013 Mon Sep 17 00:00:00 2001 From: Antoine Ténart Date: Wed, 30 Jul 2014 20:13:59 +0200 Subject: Documentation: bindings: document the sub-nodes AHCI bindings MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit 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 Ténart Signed-off-by: Tejun Heo --- .../devicetree/bindings/ata/ahci-platform.txt | 41 ++++++++++++++++++++++ 1 file changed, 41 insertions(+) (limited to 'Documentation/devicetree/bindings/ata/ahci-platform.txt') diff --git a/Documentation/devicetree/bindings/ata/ahci-platform.txt b/Documentation/devicetree/bindings/ata/ahci-platform.txt index 549ceb8cb93b..4ab09f2202d4 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" @@ -12,13 +16,30 @@ Required properties: - "snps,dwc-ahci" - "snps,exynos5440-ahci" - "snps,spear-ahci" + - "generic-ahci" - interrupts : - reg : +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 + Examples: sata@ffe08000 { @@ -34,3 +55,23 @@ Examples: clocks = <&pll6 0>, <&ahb_gates 25>; target-supply = <®_ahci_5v>; }; + +With sub-nodes: + sata@f7e90000 { + compatible = "marvell,berlin2q-achi", "generic-ahci"; + reg = <0xe90000 0x1000>; + interrupts = ; + 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>; + }; + }; -- cgit v1.2.3-59-g8ed1b