dt-bindings: ata: add DT bindings for MediaTek SATA controller

Add DT bindings for the onboard SATA controller present on the MediaTek
SoCs.

Signed-off-by: Ryder Lee <ryder.lee@mediatek.com>
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Tejun Heo <tj@kernel.org>

1 files changed, 51 insertions, 0 deletions

diff --git a/Documentation/devicetree/bindings/ata/ahci-mtk.txt b/Documentation/devicetree/bindings/ata/ahci-mtk.txt
new file mode 100644
index 000000000000..d2aa696b161b
--- /dev/null
+++ b/Documentation/devicetree/bindings/ata/ahci-mtk.txt
@@ -0,0 +1,51 @@
+MediaTek Serial ATA controller
+
+Required properties:
+ - compatible      : Must be "mediatek,<chip>-ahci", "mediatek,mtk-ahci".
+                     When using "mediatek,mtk-ahci" compatible strings, you
+                     need SoC specific ones in addition, one of:
+                     - "mediatek,mt7622-ahci"
+ - reg             : Physical base addresses and length of register sets.
+ - interrupts      : Interrupt associated with the SATA device.
+ - interrupt-names : Associated name must be: "hostc".
+ - clocks          : A list of phandle and clock specifier pairs, one for each
+                     entry in clock-names.
+ - clock-names     : Associated names must be: "ahb", "axi", "asic", "rbc", "pm".
+ - phys            : A phandle and PHY specifier pair for the PHY port.
+ - phy-names       : Associated name must be: "sata-phy".
+ - ports-implemented : See ./ahci-platform.txt for details.
+
+Optional properties:
+ - power-domains   : A phandle and power domain specifier pair to the power
+                     domain which is responsible for collapsing and restoring
+                     power to the peripheral.
+ - resets          : Must contain an entry for each entry in reset-names.
+                     See ../reset/reset.txt for details.
+ - reset-names     : Associated names must be: "axi", "sw", "reg".
+ - mediatek,phy-mode : A phandle to the system controller, used to enable
+                       SATA function.
+
+Example:
+
+        sata: sata@1a200000 {
+                compatible = "mediatek,mt7622-ahci",
+                             "mediatek,mtk-ahci";
+                reg = <0 0x1a200000 0 0x1100>;
+                interrupts = <GIC_SPI 233 IRQ_TYPE_LEVEL_HIGH>;
+                interrupt-names = "hostc";
+                clocks = <&pciesys CLK_SATA_AHB_EN>,
+                         <&pciesys CLK_SATA_AXI_EN>,
+                         <&pciesys CLK_SATA_ASIC_EN>,
+                         <&pciesys CLK_SATA_RBC_EN>,
+                         <&pciesys CLK_SATA_PM_EN>;
+                clock-names = "ahb", "axi", "asic", "rbc", "pm";
+                phys = <&u3port1 PHY_TYPE_SATA>;
+                phy-names = "sata-phy";
+                ports-implemented = <0x1>;
+                power-domains = <&scpsys MT7622_POWER_DOMAIN_HIF0>;
+                resets = <&pciesys MT7622_SATA_AXI_BUS_RST>,
+                         <&pciesys MT7622_SATA_PHY_SW_RST>,
+                         <&pciesys MT7622_SATA_PHY_REG_RST>;
+                reset-names = "axi", "sw", "reg";
+                mediatek,phy-mode = <&pciesys>;
+        };