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dt-bindings: ata: ahci-platform: Clarify common AHCI props constraints

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Indeed in accordance with what is implemented in the AHCI platform driver
and the way the AHCI DT nodes are defined in the DT files we can add the
next AHCI DT properties constraints: AHCI CSR ID is fixed to 'ahci', PHY
name is fixed to 'sata-phy', AHCI controller can't have more than 32 ports
by design, AHCI controller can have up to 32 IRQ lines.

Signed-off-by: Serge Semin <Sergey.Semin@baikalelectronics.ru>
Reviewed-by: Hannes Reinecke <hare@suse.de>
Reviewed-by: Rob Herring <robh@kernel.org>
Signed-off-by: Damien Le Moal <damien.lemoal@opensource.wdc.com>
This commit is contained in:
Serge Semin 2022-09-09 22:36:01 +03:00 committed by Damien Le Moal
parent 0f3680ed1f
commit 9bd2407064
1 changed files with 12 additions and 5 deletions
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17
Documentation/devicetree/bindings/ata/ahci-common.yaml
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@ -31,12 +31,16 @@ properties:
reg-names:
description: CSR space IDs
contains:
const: ahci
interrupts:
description:
Generic AHCI state change interrupt. Can be implemented either as a
single line attached to the controller or as a set of the signals
indicating the particular port events.
minItems: 1
maxItems: 32
ahci-supply:
description: Power regulator for AHCI controller
@ -52,14 +56,13 @@ properties:
maxItems: 1
phy-names:
maxItems: 1
const: sata-phy
ports-implemented:
$ref: '/schemas/types.yaml#/definitions/uint32'
description:
Mask that indicates which ports the HBA supports. Useful if PI is not
programmed by the BIOS, which is true for some embedded SoC's.
maximum: 0x1f
patternProperties:
"^sata-port@[0-9a-f]+$":
@ -80,8 +83,12 @@ $defs:
properties:
reg:
description: AHCI SATA port identifier
maxItems: 1
description:
AHCI SATA port identifier. By design AHCI controller can't have
more than 32 ports due to the CAP.NP fields and PI register size
constraints.
minimum: 0
maximum: 31
phys:
description: Individual AHCI SATA port PHY
@ -89,7 +96,7 @@ $defs:
phy-names:
description: AHCI SATA port PHY ID
maxItems: 1
const: sata-phy
target-supply:
description: Power regulator for SATA port target device