# SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note
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#
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# (C) COPYRIGHT 2019-2021 ARM Limited. All rights reserved.
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#
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# This program is free software and is provided to you under the terms of the
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# GNU General Public License version 2 as published by the Free Software
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# Foundation, and any use by you of this program is subject to the terms
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# of such GNU license.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program; if not, you can access it online at
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# http://www.gnu.org/licenses/gpl-2.0.html.
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#
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#
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* Arm protected memory allocator for Mali GPU device drivers
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Required properties:
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- compatible: Must be "arm,protected-memory-allocator"
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The protected memory allocator manages allocation of physical pages of a
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reserved memory region of protected memory, therefore its device node shall
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reference a reserved memory region.
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In addition to that, the protected memory allocator shall be referenced
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by the GPU.
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A complete example configuration for the device tree:
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reserved-memory {
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#address-cells = <2>;
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#size-cells = <2>;
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ranges;
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mali_protected: mali_protected@c0000000 {
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compatible = "mali-reserved";
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reg = <0x0 0xc0000000 0x0 0x1000000>;
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};
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};
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gpu_protected_memory_allocator: protected-memory-allocator {
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compatible = "arm,protected-memory-allocator";
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memory-region = <&mali_protected>;
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};
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gpu_fpga: gpu@0x6e000000 {
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compatible = "arm,mali-midgard";
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reg = <0x0 0x6e000000 0x0 0x200000>;
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interrupts = <0 168 4>, <0 168 4>, <0 168 4>;
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interrupt-names = "JOB", "MMU", "GPU";
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clocks = <&scpi_dvfs 2>;
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clock-names = "clk_mali";
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protected-memory-allocator = <&gpu_protected_memory_allocator>;
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operating-points = <
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/* KHz uV */
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50000 820000
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>;
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};
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The protected memory allocator is gpu_protected_memory_allocator.
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It references the mali_protected reserved memory region and, in turn,
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it is referenced by the GPU as protected-memory-allocator.
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