Bindings/ata/ahci-common.yaml

   1 # SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
   2 %YAML 1.2
   3 ---
   4 $id: http://devicetree.org/schemas/ata/ahci-common.yaml#
   5 $schema: http://devicetree.org/meta-schemas/core.yaml#
   6
   7 title: Common Properties for Serial ATA AHCI controllers
   8
   9 maintainers:
  10   - Hans de Goede <hdegoede@redhat.com>
  11   - Damien Le Moal <dlemoal@kernel.org>
  12
  13 description:
  14   This document defines device tree properties for a common AHCI SATA
  15   controller implementation. It's hardware interface is supposed to
  16   conform to the technical standard defined by Intel (see Serial ATA
  17   Advanced Host Controller Interface specification for details). The
  18   document doesn't constitute a DT-node binding by itself but merely
  19   defines a set of common properties for the AHCI-compatible devices.
  20
  21 select: false
  22
  23 allOf:
  24   - $ref: sata-common.yaml#
  25
  26 properties:
  27   reg:
  28     description:
  29       Generic AHCI registers space conforming to the Serial ATA AHCI
  30       specification.
  31
  32   reg-names:
  33     description: CSR space IDs
  34     contains:
  35       const: ahci
  36
  37   interrupts:
  38     description:
  39       Generic AHCI state change interrupt. Can be implemented either as a
  40       single line attached to the controller or as a set of the signals
  41       indicating the particular port events.
  42     minItems: 1
  43     maxItems: 32
  44
  45   ahci-supply:
  46     description: Power regulator for AHCI controller
  47
  48   target-supply:
  49     description: Power regulator for SATA target device
  50
  51   phy-supply:
  52     description: Power regulator for SATA PHY
  53
  54   phys:
  55     description: Reference to the SATA PHY node
  56     maxItems: 1
  57
  58   phy-names:
  59     const: sata-phy
  60
  61   hba-cap:
  62     $ref: /schemas/types.yaml#/definitions/uint32
  63     description:
  64       Bitfield of the HBA generic platform capabilities like Staggered
  65       Spin-up or Mechanical Presence Switch support. It can be used to
  66       appropriately initialize the HWinit fields of the HBA CAP register
  67       in case if the system firmware hasn't done it.
  68
  69   ports-implemented:
  70     $ref: /schemas/types.yaml#/definitions/uint32
  71     description:
  72       Mask that indicates which ports the HBA supports. Useful if PI is not
  73       programmed by the BIOS, which is true for some embedded SoC's.
  74
  75 patternProperties:
  76   "^sata-port@[0-9a-f]+$":
  77     $ref: '#/$defs/ahci-port'
  78     description:
  79       It is optionally possible to describe the ports as sub-nodes so
  80       to enable each port independently when dealing with multiple PHYs.
  81
  82 required:
  83   - reg
  84   - interrupts
  85
  86 additionalProperties: true
  87
  88 $defs:
  89   ahci-port:
  90     $ref: /schemas/ata/sata-common.yaml#/$defs/sata-port
  91
  92     properties:
  93       reg:
  94         description:
  95           AHCI SATA port identifier. By design AHCI controller can't have
  96           more than 32 ports due to the CAP.NP fields and PI register size
  97           constraints.
  98         minimum: 0
  99         maximum: 31
 100
 101       phys:
 102         description: Individual AHCI SATA port PHY
 103         maxItems: 1
 104
 105       phy-names:
 106         description: AHCI SATA port PHY ID
 107         const: sata-phy
 108
 109       target-supply:
 110         description: Power regulator for SATA port target device
 111
 112       hba-port-cap:
 113         $ref: /schemas/types.yaml#/definitions/uint32
 114         description:
 115           Bitfield of the HBA port-specific platform capabilities like Hot
 116           plugging, eSATA, FIS-based Switching, etc (see AHCI specification
 117           for details). It can be used to initialize the HWinit fields of
 118           the PxCMD register in case if the system firmware hasn't done it.
 119
 120     required:
 121       - reg
 122
 123 ...