[PATCH v4 3/6] dt-bindings:: Add document for MT8135 PMIC Wrapper

[Flora Fu]

Signed-off-by: Flora Fu <flora.fu at mediatek.com>
---
 .../soc/mediatek/mediatek,mt8135-pwrap.txt         | 51 ++++++++++++++++++++++
 1 file changed, 51 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/soc/mediatek/mediatek,mt8135-pwrap.txt

diff --git a/Documentation/devicetree/bindings/soc/mediatek/mediatek,mt8135-pwrap.txt b/Documentation/devicetree/bindings/soc/mediatek/mediatek,mt8135-pwrap.txt
new file mode 100644
index 0000000..d630fa0
--- /dev/null
+++ b/Documentation/devicetree/bindings/soc/mediatek/mediatek,mt8135-pwrap.txt
@@ -0,0 +1,51 @@
+MediaTek MT8135 PMIC Wrapper Driver
+
+MediaTek PMIC MFD is interfaced to host controller using SPI interface
+by a proprietary hardware called PMIC wrapper or pwrap.
+
++-----------------+           +---------------+
+|                 |           |               |
+| Mediatek AP SoC |           |               |
+| (ex. MT8135)    |           |    MT6397     |
+|                 |           |               |
+|      +--------+ | (SPI bus) | +--------+    |
+|      |        | |-----------| |        |    |
+|      |  PMIC  | |-----------| |  PMIC  |    |
+|      | Wrapper| |-----------| | Wrapper|    |
+|      |        | |-----------| |        |    |
+|      +--------+ |           | +--------+    |
+|                 |           |               |
++-----------------+           +---------------+
+
+This document describes the binding for MT8135 PMIC wrapper.
+
+Required properties in pwrap device node.
+- compatible:"mediatek,mt8135-pwrap"
+- interrupts: IRQ for pwrap in SOC
+- reg: address range for pwrap registers
+- resets: reset bit for pwrap
+- clock: clock frequency selection in SPI bus
+
+Optional properities:
+- pmic: Mediatek PMIC MFD is the child device of pwrap
+  See the following for child node definitions:
+  Documentation/devicetree/bindings/mfd/mt6397.txt
+
+Example:
+	pwrap: pwrap at 1000f000 {
+		compatible = "mediatek,mt8135-pwrap";
+		reg = <0 0x1000f000 0 0x1000>,
+			<0 0x11017000 0 0x1000>;
+		reg-names = "pwrap-base", "pwrap-bridge-base";
+		interrupts = <GIC_SPI 128 IRQ_TYPE_LEVEL_HIGH>;
+		resets = <&infrarst MT8135_INFRA_PMIC_WRAP_RST>,
+				<&perirst MT8135_PERI_PWRAP_BRIDGE_SW_RST>;
+		reset-names = "infra-pwrap-rst",
+				"peri-pwrap-bridge-rst";
+		clocks = <&pmicspi_sel>, <&clk26m>;
+		clock-names = "pmicspi-sel", "pmicspi-parent";
+
+		pmic {
+			compatible = "mediatek,mt6397";
+		};
+	};
-- 
1.8.1.1.dirty