Add ARM Mali Midgard device tree bindings and gpu node for rk3288

The ARM Mali Midgard GPU family is present in a number of SoCs from many different vendors such as Samsung Exynos and Rockchip.

Import the device tree bindings documentation from the r16p0 release of the Mali Midgard GPU kernel driver:

https://developer.arm.com/-/media/Files/downloads/mali-drivers/kernel/mali-midgard-gpu/TX011-SW-99002-r16p0-00rel0.tgz

The following optional bindings have been omitted in this initial version as they are only used in very specific cases:

* snoop_enable_smc
* snoop_disable_smc
* jm_config
* power_model
* system-coherency
* ipa-model

The example has been simplified accordingly.

The compatible string definition has been limited to "arm,mali-midgard" to avoid checkpatch.pl warnings and to match what the driver actually expects (as of r16p0 out-of-tree).

CC John Reitan <[email protected]>

Signed-off-by Guillaume Tucker <guillaume.tucker-ZGY8ohtN/[email protected]>

---
 .../devicetree/bindings/gpu/arm,mali-midgard.txt   | 53 ++++++++++++++++++++++
 1 file changed, 53 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/gpu/arm,mali-midgard.txt

Documentation/devicetree/bindings/gpu/arm,mali-midgard.txt new file +43 -0

new file mode 100644
index 000000000000..da8fc6d21bbf
@@ -0,0 +1,53 @@
+#
+# (C) COPYRIGHT 2013-2016 ARM Limited.
+# Copyright (C) 2017 Collabora Ltd
+#
+# This program is free software and is provided to you under the terms of the
+# GNU General Public License version 2 as published by the Free Software
+# Foundation, and any use by you of this program is subject to the terms
+# of such GNU licence.
+#
+
+
+ARM Mali Midgard GPU
+====================
+
+Required properties:
+
+- compatible : Should be "arm,mali-midgard".
+- reg : Physical base address of the device and length of the register area.
+- interrupts : Contains the three IRQ lines required by Mali Midgard devices.
+- interrupt-names : Contains the names of IRQ resources in the order they were
+  provided in the interrupts property. Must contain: "JOB, "MMU", "GPU".
+
+Optional:
+
+- clocks : Phandle to clock for the Mali Midgard device.
+- clock-names : Shall be "clk_mali".
+- mali-supply : Phandle to regulator for the Mali device. Refer to
+  Documentation/devicetree/bindings/regulator/regulator.txt for details.
+- operating-points : Refer to Documentation/devicetree/bindings/power/opp.txt
+  for details.
+
+Example for a Mali-T602:
+
+gpu@0xfc010000 {
+	compatible = "arm,mali-midgard";
+	reg = <0xfc010000 0x4000>;
+	interrupts = <0 36 4>, <0 37 4>, <0 38 4>;
+	interrupt-names = "JOB", "MMU", "GPU";
+
+	clocks = <&pclk_mali>;
+	clock-names = "clk_mali";
+	mali-supply = <&vdd_mali>;
+	operating-points = <

Add Mali GPU device tree node for the rk3288 SoC, with devfreq opp table.

Signed-off-by Guillaume Tucker <guillaume.tucker-ZGY8ohtN/[email protected]>

---
 arch/arm/boot/dts/rk3288.dtsi | 23 +++++++++++++++++++++++
 1 file changed, 23 insertions(+)

arch/arm/boot/dts/rk3288.dtsi +16 -0

index df8a0dbe9d91..213224ea309e 100644
@@ -43,6 +43,7 @@
 #include <dt-bindings/interrupt-controller/arm-gic.h>
 #include <dt-bindings/pinctrl/rockchip.h>
 #include <dt-bindings/clock/rk3288-cru.h>
+#include <dt-bindings/power/rk3288-power.h>
 #include <dt-bindings/thermal/thermal.h>
 #include <dt-bindings/power/rk3288-power.h>
 #include <dt-bindings/soc/rockchip,boot-mode.h>

@@ -227,6 +228,28 @@
 		ports = <&vopl_out>, <&vopb_out>;
 	};
 
+	gpu: mali@ffa30000 {
+		compatible = "arm,mali-midgard";
+		reg = <0xffa30000 0x10000>;
+		interrupts = <GIC_SPI 6 IRQ_TYPE_LEVEL_HIGH>,
+			     <GIC_SPI 7 IRQ_TYPE_LEVEL_HIGH>,
+			     <GIC_SPI 8 IRQ_TYPE_LEVEL_HIGH>;
+		interrupt-names = "JOB", "MMU", "GPU";
+		clocks = <&cru ACLK_GPU>;
+		clock-names = "clk_mali";
+		operating-points = <
+			/* KHz uV */
+			100000 950000
+			200000 950000
+			300000 1000000
+			400000 1100000