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Date:   Sun,  8 Oct 2017 12:35:40 +0800
From:   Icenowy Zheng <icenowy@...c.io>
To:     Tejun Heo <tj@...nel.org>,
        Maxime Ripard <maxime.ripard@...e-electrons.com>,
        Chen-Yu Tsai <wens@...e.org>
Cc:     linux-ide@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-sunxi@...glegroups.com, Icenowy Zheng <icenowy@...c.io>
Subject: [PATCH 1/2] dt-bindings: add binding for Allwinner R40 SATA AHCI controller

The Allwinner R40 SoC contains a SATA AHCI controller like the one in
A10/A20 SoCs, however a reset control and two power supplies are added
to it.

Add a binding document for it.

As a dedicated binding document is needed now for the A10/A20/R40 AHCI
controller, drop the A10 compatible line from generic platform AHCI
controller binding document.

Signed-off-by: Icenowy Zheng <icenowy@...c.io>
---
 .../devicetree/bindings/ata/ahci-platform.txt      |  1 -
 .../bindings/ata/allwinner,sun4i-a10-ahci.txt      | 40 ++++++++++++++++++++++
 2 files changed, 40 insertions(+), 1 deletion(-)
 create mode 100644 Documentation/devicetree/bindings/ata/allwinner,sun4i-a10-ahci.txt

diff --git a/Documentation/devicetree/bindings/ata/ahci-platform.txt b/Documentation/devicetree/bindings/ata/ahci-platform.txt
index fedc213b5f1a..da6818b2c204 100644
--- a/Documentation/devicetree/bindings/ata/ahci-platform.txt
+++ b/Documentation/devicetree/bindings/ata/ahci-platform.txt
@@ -9,7 +9,6 @@ PHYs.
 
 Required properties:
 - compatible        : compatible string, one of:
-  - "allwinner,sun4i-a10-ahci"
   - "brcm,iproc-ahci"
   - "hisilicon,hisi-ahci"
   - "cavium,octeon-7130-ahci"
diff --git a/Documentation/devicetree/bindings/ata/allwinner,sun4i-a10-ahci.txt b/Documentation/devicetree/bindings/ata/allwinner,sun4i-a10-ahci.txt
new file mode 100644
index 000000000000..0eea78c14ad3
--- /dev/null
+++ b/Documentation/devicetree/bindings/ata/allwinner,sun4i-a10-ahci.txt
@@ -0,0 +1,40 @@
+Allwinner A10/A20/R40 SoC SATA AHCI Controller
+
+Required properties:
+- compatible        : compatible string, one of:
+  - "allwinner,sun4i-a10-ahci"
+  - "allwinner,sun8i-r40-ahci"
+- interrupts        : the SATA IRQ
+- reg               : the register mapping
+- clocks            : the clocks needed by SATA controller, usually contains
+		      an AHB clock and a mod clock
+
+Optional properties:
+- target-supply     : regulator for SATA target power
+
+Required properties for the following compatibles:
+  - "allwinner,sun8i-r40-ahci"
+- resets            : the reset control needed by SATA controller
+- vdd1v2-supply     : regulator for SATA controller's 1.2V VDD
+- vdd2v5-supply     : regulator for SATA controller's 2.5V VDD
+
+
+Examples for A10:
+	ahci: sata@...8000 {
+		compatible = "allwinner,sun4i-a10-ahci";
+		reg = <0x01c18000 0x1000>;
+		interrupts = <56>;
+		clocks = <&pll6 0>, <&ahb_gates 25>;
+		target-supply = <&reg_ahci_5v>;
+	};
+
+Examples for R40:
+	ahci: sata@...8000 {
+		compatible = "allwinner,sun8i-r40-ahci";
+		reg = <0x01c18000 0x1000>;
+		interrupts = <GIC_SPI 56 IRQ_TYPE_LEVEL_HIGH>;
+		clocks = <&ccu CLK_SATA>, <&ccu CLK_BUS_SATA>;
+		resets = <&ccu RST_BUS_SATA>;
+		vdd1v2-supply = <&reg_eldo3>;
+		vdd2v5-supply = <&reg_dldo4>;
+	};
-- 
2.13.6

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