[PATCH v2 1/5] dt-bindings: gpu: add bindings for the ARM Mali Midgard GPU

[Guillaume Tucker <guillaume.tucker@collabora.com>]

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 <john.reitan@arm.com>
Signed-off-by: Guillaume Tucker <guillaume.tucker@collabora.com>
---
 .../devicetree/bindings/gpu/arm,mali-midgard.txt   | 53 ++++++++++++++++++++++
 1 file changed, 53 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/gpu/arm,mali-midgard.txt

diff --git a/Documentation/devicetree/bindings/gpu/arm,mali-midgard.txt b/Documentation/devicetree/bindings/gpu/arm,mali-midgard.txt
new file mode 100644
index 000000000000..da8fc6d21bbf
--- /dev/null
+++ b/Documentation/devicetree/bindings/gpu/arm,mali-midgard.txt
@@ -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 = <
+		/* KHz   uV */
+		533000 1250000,
+		450000 1150000,
+		400000 1125000,
+		350000 1075000,
+		266000 1025000,
+		160000  925000,
+		100000  912500,
+	>;
+};
-- 
2.11.0