Re: [PATCH v3 12/23] dt-bindings: ata: ahci: Add platform capability properties

Hannes Reinecke
2022-05-12T06:58:06Z

On 5/12/22 01:17, Serge Semin wrote:
> 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 can define a set AHCI DT-node properties to describe
> all of HW-init capabilities flags. 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 whole HBA by
> means of the "hba-sss" and "hba-smps" properties. Each port can have the
> "hba-{hpcp,mpsp,cpd,esp,fbscp}" defined indicatating that the port
> supports the next functionality: 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>
>
> ---
>
> Alternatively we could define them as a bitfield, but having a set of
> boolean properties seemed a better idea since in that case we can
> implement a simple inter-dependency rules for them, which can't be done
> should we take the bitfields path.
> ---
> .../devicetree/bindings/ata/ahci-common.yaml | 66 +++++++++++++++++++
> .../bindings/ata/ahci-platform.yaml | 11 ++++
> 2 files changed, 77 insertions(+)
>
Reviewed-by: Hannes Reinecke <hare@suse.de>

Cheers,

Hannes
--
Dr. Hannes Reinecke Kernel Storage Architect
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