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# SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note
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# of such GNU license.
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
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* Arm protected memory allocator for Mali GPU device drivers
Required properties:
- compatible: Must be "arm,protected-memory-allocator"
The protected memory allocator manages allocation of physical pages of a
reserved memory region of protected memory, therefore its device node shall
reference a reserved memory region.
In addition to that, the protected memory allocator shall be referenced
by the GPU.
A complete example configuration for the device tree:
reserved-memory {
#address-cells = <2>;
#size-cells = <2>;
mali_protected: mali_protected@c0000000 {
compatible = "mali-reserved";
reg = <0x0 0xc0000000 0x0 0x1000000>;
gpu_protected_memory_allocator: protected-memory-allocator {
compatible = "arm,protected-memory-allocator";
memory-region = <&mali_protected>;
gpu_fpga: gpu@0x6e000000 {
compatible = "arm,mali-midgard";
reg = <0x0 0x6e000000 0x0 0x200000>;
interrupts = <0 168 4>, <0 168 4>, <0 168 4>;
interrupt-names = "JOB", "MMU", "GPU";
clocks = <&scpi_dvfs 2>;
clock-names = "clk_mali";
protected-memory-allocator = <&gpu_protected_memory_allocator>;
operating-points = <
/* KHz uV */
50000 820000
The protected memory allocator is gpu_protected_memory_allocator.
It references the mali_protected reserved memory region and, in turn,
it is referenced by the GPU as protected-memory-allocator.