Bindings/remoteproc/qcom,rpm-proc.yaml

   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
   7 title: Qualcomm Resource Power Manager (RPM) Processor/Subsystem
   8
   9 maintainers:
  10   - Bjorn Andersson <andersson@kernel.org>
  11   - Konrad Dybcio <konrad.dybcio@linaro.org>
  12   - Stephan Gerhold <stephan@gerhold.net>
  13
  14 description: |
  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
  65 properties:
  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
 119 required:
 120   - compatible
 121
 122 oneOf:
 123   - required:
 124       - smd-edge
 125   - required:
 126       - glink-edge
 127
 128 additionalProperties: false
 129
 130 examples:
 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     };