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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> | 2022-09-17 01:39:38 +0900 |
| commit | 03f1076fbe9fd0edd92011f1c97bf6daad83d01b (patch) | |
| tree | 374f2b8782276ec22e6cc166add0bbcb4d5a20f1 /include/dt-bindings | |
| parent | f67f12ff57bcfcd7d64280f748787793217faeaf (diff) | |
| download | lwn-03f1076fbe9fd0edd92011f1c97bf6daad83d01b.tar.gz lwn-03f1076fbe9fd0edd92011f1c97bf6daad83d01b.zip | |
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 'include/dt-bindings')
| -rw-r--r-- | include/dt-bindings/ata/ahci.h | 20 |
1 files changed, 20 insertions, 0 deletions
diff --git a/include/dt-bindings/ata/ahci.h b/include/dt-bindings/ata/ahci.h new file mode 100644 index 000000000000..77997b35612c --- /dev/null +++ b/include/dt-bindings/ata/ahci.h @@ -0,0 +1,20 @@ +/* SPDX-License-Identifier: GPL-2.0-only or BSD-2-Clause */ +/* + * This header provides constants for most AHCI bindings. + */ + +#ifndef _DT_BINDINGS_ATA_AHCI_H +#define _DT_BINDINGS_ATA_AHCI_H + +/* Host Bus Adapter generic platform capabilities */ +#define HBA_SSS (1 << 27) +#define HBA_SMPS (1 << 28) + +/* Host Bus Adapter port-specific platform capabilities */ +#define HBA_PORT_HPCP (1 << 18) +#define HBA_PORT_MPSP (1 << 19) +#define HBA_PORT_CPD (1 << 20) +#define HBA_PORT_ESP (1 << 21) +#define HBA_PORT_FBSCP (1 << 22) + +#endif |