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

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Message-ID: <5d7ae3e5-3f21-a610-7beb-274ede95850d@suse.de>
Date:   Thu, 12 May 2022 08:56:41 +0200
From:   Hannes Reinecke <hare@...e.de>
To:     Serge Semin <Sergey.Semin@...kalelectronics.ru>,
        Damien Le Moal <damien.lemoal@...nsource.wdc.com>,
        Hans de Goede <hdegoede@...hat.com>,
        Jens Axboe <axboe@...nel.dk>, Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>
Cc:     Serge Semin <fancer.lancer@...il.com>,
        Alexey Malahov <Alexey.Malahov@...kalelectronics.ru>,
        Pavel Parkhomenko <Pavel.Parkhomenko@...kalelectronics.ru>,
        linux-ide@...r.kernel.org, linux-kernel@...r.kernel.org,
        devicetree@...r.kernel.org
Subject: Re: [PATCH v3 12/23] dt-bindings: ata: ahci: Add platform capability
 properties

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@...kalelectronics.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@...e.de>

Cheers,

Hannes
-- 
Dr. Hannes Reinecke		           Kernel Storage Architect
hare@...e.de			                  +49 911 74053 688
SUSE Software Solutions Germany GmbH, Maxfeldstr. 5, 90409 Nürnberg
HRB 36809 (AG Nürnberg), GF: Felix Imendörffer