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| author | Serge Semin <Sergey.Semin@baikalelectronics.ru> | 2022-09-09 22:36:09 +0300 |
|---|---|---|
| committer | Damien Le Moal <damien.lemoal@opensource.wdc.com> | 2022-09-16 19:39:38 +0300 |
| commit | 03f1076fbe9fd0edd92011f1c97bf6daad83d01b (patch) | |
| tree | 374f2b8782276ec22e6cc166add0bbcb4d5a20f1 /Documentation/devicetree/bindings/ata/ahci-common.yaml | |
| parent | f67f12ff57bcfcd7d64280f748787793217faeaf (diff) | |
| download | linux-03f1076fbe9fd0edd92011f1c97bf6daad83d01b.tar.xz | |
dt-bindings: ata: ahci: Add platform capability properties
In case if the platform doesn't have BIOS or a comprehensive firmware
installed then the HBA capability flags will be left uninitialized. As a
good alternative we suggest to define the DT-properties with the AHCI
platform capabilities describing all the HW-init flags of the
corresponding capability register. Luckily there aren't too many of them.
SSS - Staggered Spin-up support and MPS - Mechanical Presence Switch
support determine the corresponding feature availability for the whole HBA
by means of the "hba-cap" property. Each port can have the "hba-port-cap"
property initialized indicating that the port supports some of the next
functionalities: HPCP - HotPlug capable port, MPSP - Mechanical Presence
Switch attached to a port, CPD - Cold Plug detection, ESP - External SATA
Port (eSATA), FBSCP - FIS-based switching capable port.
Signed-off-by: Serge Semin <Sergey.Semin@baikalelectronics.ru>
Reviewed-by: Rob Herring <robh@kernel.org>
Signed-off-by: Damien Le Moal <damien.lemoal@opensource.wdc.com>
Diffstat (limited to 'Documentation/devicetree/bindings/ata/ahci-common.yaml')
| -rw-r--r-- | Documentation/devicetree/bindings/ata/ahci-common.yaml | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/Documentation/devicetree/bindings/ata/ahci-common.yaml b/Documentation/devicetree/bindings/ata/ahci-common.yaml index 12a97b56226f..94d72aeaad0f 100644 --- a/Documentation/devicetree/bindings/ata/ahci-common.yaml +++ b/Documentation/devicetree/bindings/ata/ahci-common.yaml @@ -58,6 +58,14 @@ properties: phy-names: const: sata-phy + hba-cap: + $ref: '/schemas/types.yaml#/definitions/uint32' + description: + Bitfield of the HBA generic platform capabilities like Staggered + Spin-up or Mechanical Presence Switch support. It can be used to + appropriately initialize the HWinit fields of the HBA CAP register + in case if the system firmware hasn't done it. + ports-implemented: $ref: '/schemas/types.yaml#/definitions/uint32' description: @@ -101,6 +109,14 @@ $defs: target-supply: description: Power regulator for SATA port target device + hba-port-cap: + $ref: '/schemas/types.yaml#/definitions/uint32' + description: + Bitfield of the HBA port-specific platform capabilities like Hot + plugging, eSATA, FIS-based Switching, etc (see AHCI specification + for details). It can be used to initialize the HWinit fields of + the PxCMD register in case if the system firmware hasn't done it. + required: - reg |