1# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause) 2%YAML 1.2 3--- 4$id: http://devicetree.org/schemas/remoteproc/qcom,rpm-proc.yaml# 5$schema: http://devicetree.org/meta-schemas/core.yaml# 6 7title: Qualcomm Resource Power Manager (RPM) Processor/Subsystem 8 9maintainers: 10 - Bjorn Andersson <andersson@kernel.org> 11 - Konrad Dybcio <konrad.dybcio@linaro.org> 12 - Stephan Gerhold <stephan@gerhold.net> 13 14description: | 15 Resource Power Manager (RPM) subsystem found in various Qualcomm platforms: 16 17 +--------------------------------------------+ 18 | RPM subsystem (qcom,rpm-proc) | 19 | | 20 reset | +---------------+ +-----+ +-----+ | 21 --------->| | | MPM | | CPR | ... | 22 IPC interrupts | | ARM Cortex-M3 |--- +-----+ +-----+ | 23 ----------------->| | | | | | 24 | +---------------+ |---------------------- | 25 | +---------------+ | | 26 | | Code RAM |--| +------------------+ | 27 | +---------------+ | | | | 28 | +---------------+ |--| Message RAM | | 29 | | Data RAM |--| | | | 30 | +---------------+ | +------------------+ | 31 +--------------------|-----------------------+ 32 v 33 NoC 34 35 The firmware running on the processor inside the RPM subsystem allows each 36 component in the system to vote for state of the system resources, such as 37 clocks, regulators and bus frequencies. It implements multiple separate 38 communication interfaces that are described in subnodes, e.g. SMD and MPM: 39 40 +------------------------------+ 41 | ARM Cortex-M3 | 42 | | +------------------------------+ 43 | +--------------------------+ | | Message RAM | 44 | | RPM firmware | | | | 45 IPC IRQ 0 | | +----------------------+ | | | +--------------------------+ | 46 -------------->| SMD server |<------->| SMD data structures | | 47 | | | +--------------+ | | | | | +--------------+ | | 48 | | | | rpm_requests | ... | | | | | | rpm_requests | ... | | 49 | | | +--------------+ | | | | | +--------------+ | | 50 IPC IRQ 1 | | +----------------------+ | | | +--------------------------+ | 51 -------------->| MPM virtualization |<--------| MPM register copy (vMPM) | | 52 | | +----------------------+ | | | +--------------------------+ | 53 | | ... | | | | ... | 54 | +--------------------|-----+ | +------------------------------+ 55 +----------------------|-------+ 56 v 57 +--------------+ 58 | MPM Hardware | 59 +--------------+ 60 61 The services provided by the firmware are only available after the firmware 62 has been loaded and the processor has been released from reset. Usually this 63 happens early in the boot process before the operating system is started. 64 65properties: 66 compatible: 67 items: 68 - enum: 69 - qcom,apq8084-rpm-proc 70 - qcom,ipq6018-rpm-proc 71 - qcom,ipq9574-rpm-proc 72 - qcom,mdm9607-rpm-proc 73 - qcom,msm8226-rpm-proc 74 - qcom,msm8610-rpm-proc 75 - qcom,msm8909-rpm-proc 76 - qcom,msm8916-rpm-proc 77 - qcom,msm8917-rpm-proc 78 - qcom,msm8936-rpm-proc 79 - qcom,msm8937-rpm-proc 80 - qcom,msm8952-rpm-proc 81 - qcom,msm8953-rpm-proc 82 - qcom,msm8974-rpm-proc 83 - qcom,msm8976-rpm-proc 84 - qcom,msm8994-rpm-proc 85 - qcom,msm8996-rpm-proc 86 - qcom,msm8998-rpm-proc 87 - qcom,qcm2290-rpm-proc 88 - qcom,qcs404-rpm-proc 89 - qcom,sdm660-rpm-proc 90 - qcom,sm6115-rpm-proc 91 - qcom,sm6125-rpm-proc 92 - qcom,sm6375-rpm-proc 93 - const: qcom,rpm-proc 94 95 smd-edge: 96 $ref: /schemas/remoteproc/qcom,smd-edge.yaml# 97 description: 98 Qualcomm Shared Memory subnode which represents communication edge, 99 channels and devices related to the RPM subsystem. 100 101 glink-edge: 102 $ref: /schemas/remoteproc/qcom,glink-rpm-edge.yaml# 103 description: 104 Qualcomm G-Link subnode which represents communication edge, 105 channels and devices related to the RPM subsystem. 106 107 interrupt-controller: 108 type: object 109 $ref: /schemas/interrupt-controller/qcom,mpm.yaml# 110 description: 111 MSM Power Manager (MPM) interrupt controller that monitors interrupts 112 when the system is asleep. 113 114 master-stats: 115 $ref: /schemas/soc/qcom/qcom,rpm-master-stats.yaml# 116 description: 117 Subsystem-level low-power mode statistics provided by RPM. 118 119required: 120 - compatible 121 122oneOf: 123 - required: 124 - smd-edge 125 - required: 126 - glink-edge 127 128additionalProperties: false 129 130examples: 131 # SMD 132 - | 133 #include <dt-bindings/interrupt-controller/arm-gic.h> 134 #include <dt-bindings/interrupt-controller/irq.h> 135 136 remoteproc { 137 compatible = "qcom,msm8916-rpm-proc", "qcom,rpm-proc"; 138 139 smd-edge { 140 interrupts = <GIC_SPI 168 IRQ_TYPE_EDGE_RISING>; 141 qcom,ipc = <&apcs 8 0>; 142 qcom,smd-edge = <15>; 143 144 rpm-requests { 145 compatible = "qcom,rpm-msm8916"; 146 qcom,smd-channels = "rpm_requests"; 147 /* ... */ 148 }; 149 }; 150 }; 151 # GLINK 152 - | 153 #include <dt-bindings/interrupt-controller/arm-gic.h> 154 #include <dt-bindings/interrupt-controller/irq.h> 155 156 remoteproc { 157 compatible = "qcom,qcm2290-rpm-proc", "qcom,rpm-proc"; 158 159 glink-edge { 160 compatible = "qcom,glink-rpm"; 161 interrupts = <GIC_SPI 194 IRQ_TYPE_EDGE_RISING>; 162 qcom,rpm-msg-ram = <&rpm_msg_ram>; 163 mboxes = <&apcs_glb 0>; 164 165 rpm-requests { 166 compatible = "qcom,rpm-qcm2290"; 167 qcom,glink-channels = "rpm_requests"; 168 /* ... */ 169 }; 170 }; 171 }; 172