| # |
| # (C) COPYRIGHT 2013-2018 ARM Limited. All rights reserved. |
| # |
| # 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. |
| # |
| # This program is distributed in the hope that it will be useful, |
| # but WITHOUT ANY WARRANTY; without even the implied warranty of |
| # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| # GNU General Public License for more details. |
| # |
| # You should have received a copy of the GNU General Public License |
| # along with this program; if not, you can access it online at |
| # http://www.gnu.org/licenses/gpl-2.0.html. |
| # |
| # SPDX-License-Identifier: GPL-2.0 |
| # |
| # |
| |
| * ARM Mali Midgard devices |
| |
| |
| Required properties: |
| |
| - compatible : Should be mali<chip>, replacing digits with x from the back, |
| until malit<Major>xx, ending with arm,mali-midgard, the latter not optional. |
| - reg : Physical base address of the device and length of the register area. |
| - interrupts : Contains the three IRQ lines required by T-6xx 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 T-6xx 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-v2 : Refer to Documentation/devicetree/bindings/power/opp.txt |
| for details. |
| - jm_config : For T860/T880. Sets job manager configuration. An array containing: |
| - 1 to override the TIMESTAMP value, 0 otherwise. |
| - 1 to override clock gate, forcing them to be always on, 0 otherwise. |
| - 1 to enable job throttle, limiting the number of cores that can be started |
| simultaneously, 0 otherwise. |
| - Value between 0 and 63 (including). If job throttle is enabled, this is one |
| less than the number of cores that can be started simultaneously. |
| - power_model : Sets the power model parameters. Three power models are currently |
| defined which include "mali-simple-power-model", "mali-g71-power-model" and |
| "mali-g72-power-model". |
| - mali-simple-power-model: this model derives the GPU power usage based |
| on the GPU voltage scaled by the system temperature. Note: it was |
| designed for the Juno platform, and may not be suitable for others. |
| - compatible: Should be "arm,mali-simple-power-model" |
| - dynamic-coefficient: Coefficient, in pW/(Hz V^2), which is |
| multiplied by v^2*f to calculate the dynamic power consumption. |
| - static-coefficient: Coefficient, in uW/V^3, which is |
| multiplied by v^3 to calculate the static power consumption. |
| - ts: An array containing coefficients for the temperature |
| scaling factor. This is used to scale the static power by a |
| factor of tsf/1000000, |
| where tsf = ts[3]*T^3 + ts[2]*T^2 + ts[1]*T + ts[0], |
| and T = temperature in degrees. |
| - thermal-zone: A string identifying the thermal zone used for |
| the GPU |
| - temp-poll-interval-ms: the interval at which the system |
| temperature is polled |
| - mali-g71-power-model / mali-g72-power-model: these models derive |
| the GPU power usage based on performance counters, so they are more |
| accurate. |
| - compatible: Should be "arm,mali-g71-power-model" / |
| "arm,mali-g72-power-model" |
| - scale: the dynamic power calculated by the power model is |
| scaled by a factor of "scale"/1000. This value should be |
| chosen to match a particular implementation. |
| - min_sample_cycles: Fall back to the simple power model if the |
| number of GPU cycles for a given counter dump is less than |
| 'min_sample_cycles'. The default value of this should suffice. |
| * Note: when IPA is used, two separate power models (simple and counter-based) |
| are used at different points so care should be taken to configure |
| both power models in the device tree (specifically dynamic-coefficient, |
| static-coefficient and scale) to best match the platform. |
| - system-coherency : Sets the coherency protocol to be used for coherent |
| accesses made from the GPU. |
| If not set then no coherency is used. |
| - 0 : ACE-Lite |
| - 1 : ACE |
| - 31 : No coherency |
| - ipa-model : Sets the IPA model to be used for power management. GPU probe will fail if the |
| model is not found in the registered models list. If no model is specified here, |
| a gpu-id based model is picked if available, otherwise the default model is used. |
| - mali-simple-power-model: Default model used on mali |
| - protected-mode-switcher : Phandle to device implemented protected mode switching functionality. |
| Refer to Documentation/devicetree/bindings/arm/smc-protected-mode-switcher.txt for one implementation. |
| |
| Example for a Mali GPU: |
| |
| gpu@0xfc010000 { |
| compatible = "arm,malit602", "arm,malit60x", "arm,malit6xx", "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-v2 = <&gpu_opp_table>; |
| power_model@0 { |
| compatible = "arm,mali-simple-power-model"; |
| static-coefficient = <2427750>; |
| dynamic-coefficient = <4687>; |
| ts = <20000 2000 (-20) 2>; |
| thermal-zone = "gpu"; |
| }; |
| power_model@1 { |
| compatible = "arm,mali-g71-power-model"; |
| scale = <5>; |
| }; |
| }; |
| |
| gpu_opp_table: opp_table0 { |
| compatible = "operating-points-v2"; |
| |
| opp@533000000 { |
| opp-hz = /bits/ 64 <533000000>; |
| opp-microvolt = <1250000>; |
| }; |
| opp@450000000 { |
| opp-hz = /bits/ 64 <450000000>; |
| opp-microvolt = <1150000>; |
| }; |
| opp@400000000 { |
| opp-hz = /bits/ 64 <400000000>; |
| opp-microvolt = <1125000>; |
| }; |
| opp@350000000 { |
| opp-hz = /bits/ 64 <350000000>; |
| opp-microvolt = <1075000>; |
| }; |
| opp@266000000 { |
| opp-hz = /bits/ 64 <266000000>; |
| opp-microvolt = <1025000>; |
| }; |
| opp@160000000 { |
| opp-hz = /bits/ 64 <160000000>; |
| opp-microvolt = <925000>; |
| }; |
| opp@100000000 { |
| opp-hz = /bits/ 64 <100000000>; |
| opp-microvolt = <912500>; |
| }; |
| }; |