linux-kernel - [PATCH v2 02/21] dt-bindings: gpu: img: Further constrain clocks

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Message-ID: <20241118-sets-bxs-4-64-patch-v1-v2-2-3fd45d9fb0cf@imgtec.com>
Date: Mon, 18 Nov 2024 13:01:54 +0000
From: Matt Coster <matt.coster@...tec.com>
To: Frank Binns <frank.binns@...tec.com>,
        Matt Coster
	<matt.coster@...tec.com>,
        David Airlie <airlied@...il.com>, Simona Vetter
	<simona@...ll.ch>,
        Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        Maxime Ripard <mripard@...nel.org>,
        Thomas Zimmermann <tzimmermann@...e.de>, Rob Herring <robh@...nel.org>,
        Krzysztof Kozlowski <krzk+dt@...nel.org>,
        Conor Dooley <conor+dt@...nel.org>, Nishanth Menon <nm@...com>,
        "Vignesh
 Raghavendra" <vigneshr@...com>,
        Tero Kristo <kristo@...nel.org>
CC: <dri-devel@...ts.freedesktop.org>, <devicetree@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <linux-arm-kernel@...ts.infradead.org>,
        Randolph Sapp <rs@...com>, Darren Etheridge <detheridge@...com>
Subject: [PATCH v2 02/21] dt-bindings: gpu: img: Further constrain clocks

All Imagination GPUs use three clocks: core, mem and sys. All reasonably
modern Imagination GPUs also support a single-clock mode where the SoC
only hooks up core and the other two are derived internally. On GPUs which
support this mode, it is the default and most commonly used integration.

Codify this "1 or 3" constraint in our bindings and hang the specifics off
the vendor compatible string to mirror the integration-time choice.

Signed-off-by: Matt Coster <matt.coster@...tec.com>
---
Changes in v2:
- Simplified clocks constraints (P2)
- Link to v1: https://lore.kernel.org/r/20241105-sets-bxs-4-64-patch-v1-v1-2-4ed30e865892@imgtec.com
---
 .../devicetree/bindings/gpu/img,powervr-rogue.yaml   | 20 +++++++++++---------
 1 file changed, 11 insertions(+), 9 deletions(-)

diff --git a/Documentation/devicetree/bindings/gpu/img,powervr-rogue.yaml b/Documentation/devicetree/bindings/gpu/img,powervr-rogue.yaml
index ef7070daf213277d0190fe319e202fdc597337d4..3b5a5b966585ac29ad104c7aef19881eca73ce80 100644
--- a/Documentation/devicetree/bindings/gpu/img,powervr-rogue.yaml
+++ b/Documentation/devicetree/bindings/gpu/img,powervr-rogue.yaml
@@ -29,16 +29,16 @@ properties:
   reg:
     maxItems: 1
 
-  clocks:
-    minItems: 1
-    maxItems: 3
+  clocks: true
 
   clock-names:
-    items:
-      - const: core
-      - const: mem
-      - const: sys
-    minItems: 1
+    oneOf:
+      - items:
+          - const: core
+      - items:
+          - const: core
+          - const: mem
+          - const: sys
 
   interrupts:
     maxItems: 1
@@ -56,11 +56,13 @@ required:
 additionalProperties: false
 
 allOf:
+  # Vendor integrations using a single clock domain
   - if:
       properties:
         compatible:
           contains:
-            const: ti,am62-gpu
+            anyOf:
+              - const: ti,am62-gpu
     then:
       properties:
         clocks:

-- 
2.47.0