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From:   Serge Semin <Sergey.Semin@baikalelectronics.ru>
To:     Damien Le Moal <damien.lemoal@opensource.wdc.com>,
        Hans de Goede <hdegoede@redhat.com>,
        Jens Axboe <axboe@kernel.dk>, Rob Herring <robh+dt@kernel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@linaro.org>
CC:     Serge Semin <Sergey.Semin@baikalelectronics.ru>,
        Serge Semin <fancer.lancer@gmail.com>,
        Alexey Malahov <Alexey.Malahov@baikalelectronics.ru>,
        Pavel Parkhomenko <Pavel.Parkhomenko@baikalelectronics.ru>,
        <linux-ide@vger.kernel.org>, <linux-kernel@vger.kernel.org>,
        <devicetree@vger.kernel.org>
Subject: [PATCH v2 03/23] dt-bindings: ata: ahci-platform: Clarify common AHCI props constraints
Date:   Tue, 3 May 2022 23:09:18 +0300
Message-ID: <20220503200938.18027-4-Sergey.Semin@baikalelectronics.ru>
In-Reply-To: <20220503200938.18027-1-Sergey.Semin@baikalelectronics.ru>
References: <20220503200938.18027-1-Sergey.Semin@baikalelectronics.ru>
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Indeed in accordance with what is imeplemtned in the AHCI paltform 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.

Signed-off-by: Serge Semin <Sergey.Semin@baikalelectronics.ru>

Changelog v2:
- This is a new patch created after rebasing v1 onto the 5.18-rc3 kernel.
---
 .../devicetree/bindings/ata/ahci-common.yaml      | 15 ++++++++++-----
 1 file changed, 10 insertions(+), 5 deletions(-)

diff --git a/Documentation/devicetree/bindings/ata/ahci-common.yaml b/Documentation/devicetree/bindings/ata/ahci-common.yaml
index 72e24b246040..70f915748270 100644
--- a/Documentation/devicetree/bindings/ata/ahci-common.yaml
+++ b/Documentation/devicetree/bindings/ata/ahci-common.yaml
@@ -31,6 +31,8 @@ properties:
 
   reg-names:
     description: CSR space IDs
+    contains:
+      const: ahci
 
   interrupts:
     description:
@@ -71,14 +73,13 @@ 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]+$":
@@ -89,8 +90,12 @@ patternProperties:
 
     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
@@ -98,7 +103,7 @@ patternProperties:
 
       phy-names:
         description: AHCI SATA port PHY ID
-        maxItems: 1
+        const: sata-phy
 
       target-supply:
         description: Power regulator for SATA port target device
-- 
2.35.1