Documentation/devicetree/bindings/display/mediatek/mediatek,mutex.yaml

   1 # SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
   2 %YAML 1.2
   3 ---
   4 $id: http://devicetree.org/schemas/display/mediatek/mediatek,mutex.yaml#
   5 $schema: http://devicetree.org/meta-schemas/core.yaml#
   6
   7 title: Mediatek mutex
   8
   9 maintainers:
  10   - Chun-Kuang Hu <chunkuang.hu@kernel.org>
  11   - Philipp Zabel <p.zabel@pengutronix.de>
  12
  13 description: |
  14   Mediatek mutex, namely MUTEX, is used to send the triggers signals called
  15   Start Of Frame (SOF) / End Of Frame (EOF) to each sub-modules on the display
  16   data path or MDP data path.
  17   In some SoC, such as mt2701, MUTEX could be a hardware mutex which protects
  18   the shadow register.
  19   MUTEX device node must be siblings to the central MMSYS_CONFIG node.
  20   For a description of the MMSYS_CONFIG binding, see
  21   Documentation/devicetree/bindings/arm/mediatek/mediatek,mmsys.yaml
  22   for details.
  23
  24 properties:
  25   compatible:
  26     oneOf:
  27       - items:
  28           - const: mediatek,mt2701-disp-mutex
  29       - items:
  30           - const: mediatek,mt2712-disp-mutex
  31       - items:
  32           - const: mediatek,mt8167-disp-mutex
  33       - items:
  34           - const: mediatek,mt8173-disp-mutex
  35       - items:
  36           - const: mediatek,mt8183-disp-mutex
  37       - items:
  38           - const: mediatek,mt8192-disp-mutex
  39       - items:
  40           - const: mediatek,mt8195-disp-mutex
  41   reg:
  42     maxItems: 1
  43
  44   interrupts:
  45     maxItems: 1
  46
  47   power-domains:
  48     description: A phandle and PM domain specifier as defined by bindings of
  49       the power controller specified by phandle. See
  50       Documentation/devicetree/bindings/power/power-domain.yaml for details.
  51
  52   clocks:
  53     items:
  54       - description: MUTEX Clock
  55
  56   mediatek,gce-events:
  57     description:
  58       The event id which is mapping to the specific hardware event signal
  59       to gce. The event id is defined in the gce header
  60       include/dt-bindings/gce/<chip>-gce.h of each chips.
  61     $ref: /schemas/types.yaml#/definitions/uint32-array
  62
  63 required:
  64   - compatible
  65   - reg
  66   - interrupts
  67   - power-domains
  68   - clocks
  69
  70 additionalProperties: false
  71
  72 examples:
  73   - |
  74     #include <dt-bindings/interrupt-controller/arm-gic.h>
  75     #include <dt-bindings/clock/mt8173-clk.h>
  76     #include <dt-bindings/power/mt8173-power.h>
  77     #include <dt-bindings/gce/mt8173-gce.h>
  78
  79     soc {
  80         #address-cells = <2>;
  81         #size-cells = <2>;
  82
  83         mutex: mutex@14020000 {
  84             compatible = "mediatek,mt8173-disp-mutex";
  85             reg = <0 0x14020000 0 0x1000>;
  86             interrupts = <GIC_SPI 169 IRQ_TYPE_LEVEL_LOW>;
  87             power-domains = <&spm MT8173_POWER_DOMAIN_MM>;
  88             clocks = <&mmsys CLK_MM_MUTEX_32K>;
  89             mediatek,gce-events = <CMDQ_EVENT_MUTEX0_STREAM_EOF>,
  90                                   <CMDQ_EVENT_MUTEX1_STREAM_EOF>;
  91         };
  92     };