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Date: Thu, 16 Jun 2022 00:56:28 +0300
From: Serge Semin <fancer.lancer@...il.com>
To: Rob Herring <robh@...nel.org>
Cc: 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>, Hannes Reinecke <hare@...e.de>,
Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
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 v4 11/23] dt-bindings: ata: ahci: Add platform capability
properties
On Tue, Jun 14, 2022 at 04:19:17PM -0600, Rob Herring wrote:
> On Fri, Jun 10, 2022 at 11:17:49AM +0300, 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 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@...kalelectronics.ru>
> >
> > ---
> >
> > Changelog v4:
> > - Fix some misspelling in the patch log.
> > - Convert the boolean properties to the bitfield properties. (@Rob)
> > - Remove Hannes' rb tag due to the patch content change.
> > ---
> > .../devicetree/bindings/ata/ahci-common.yaml | 16 +++++++++++++++
> > .../bindings/ata/ahci-platform.yaml | 10 ++++++++++
> > include/dt-bindings/ata/ahci.h | 20 +++++++++++++++++++
> > 3 files changed, 46 insertions(+)
> > create mode 100644 include/dt-bindings/ata/ahci.h
> >
> > 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
> >
> > diff --git a/Documentation/devicetree/bindings/ata/ahci-platform.yaml b/Documentation/devicetree/bindings/ata/ahci-platform.yaml
> > index 15be98e0385b..e19cf9828e68 100644
> > --- a/Documentation/devicetree/bindings/ata/ahci-platform.yaml
> > +++ b/Documentation/devicetree/bindings/ata/ahci-platform.yaml
> > @@ -111,6 +111,8 @@ examples:
> > - |
> > #include <dt-bindings/interrupt-controller/arm-gic.h>
> > #include <dt-bindings/clock/berlin2q.h>
> > + #include <dt-bindings/ata/ahci.h>
> > +
> > sata@...90000 {
> > compatible = "marvell,berlin2q-ahci", "generic-ahci";
> > reg = <0xf7e90000 0x1000>;
> > @@ -119,15 +121,23 @@ examples:
> > #address-cells = <1>;
> > #size-cells = <0>;
> >
> > + hba-cap = <HBA_SMPS>;
> > +
> > sata0: sata-port@0 {
> > reg = <0>;
> > +
> > phys = <&sata_phy 0>;
> > target-supply = <®_sata0>;
> > +
> > + hba-port-cap = <(HBA_PORT_FBSCP | HBA_PORT_ESP)>;
> > };
> >
> > sata1: sata-port@1 {
> > reg = <1>;
> > +
> > phys = <&sata_phy 1>;
> > target-supply = <®_sata1>;
> > +
> > + hba-port-cap = <(HBA_PORT_HPCP | HBA_PORT_MPSP | HBA_PORT_FBSCP)>;
> > };
> > };
> > diff --git a/include/dt-bindings/ata/ahci.h b/include/dt-bindings/ata/ahci.h
> > new file mode 100644
> > index 000000000000..6841caebcedf
> > --- /dev/null
> > +++ b/include/dt-bindings/ata/ahci.h
> > @@ -0,0 +1,20 @@
> > +/* SPDX-License-Identifier: GPL-2.0 */
>
> Dual license.
Ok.
>
> With that,
>
> Reviewed-by: Rob Herring <robh@...nel.org>
Thanks.
-Sergey
>
> > +/*
> > + * 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
> > --
> > 2.35.1
> >
> >
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