[PATCH v8 2/4] dt-bindings: gpu: img,powervr-rogue: Add TH1520 GPU compatible

[Michal Wilczynski]

Update the img,powervr-rogue.yaml to include the T-HEAD TH1520 SoC's
specific GPU compatible string.

The thead,th1520-gpu compatible, along with its full chain
img,img-bxm-4-64, and img,img-rogue, is added to the
list of recognized GPU types.

While the BXM-4-64 GPU IP is designed with two distinct power domains,
the TH1520 SoC integrates it with only a single, unified power gate that
is controllable by the kernel.

To model this reality correctly while keeping the binding accurate for
other devices, add conditional constraints to the `allOf` section:
 - An if block for thead,th1520-gpu enforces a maximum of one
   power domain and disallows the power-domain-names property.
 - A separate if block applies to other B-series GPUs
   img,img-bxm-4-64 and img,img-bxs-4-64. A not clause within this
   block excludes the thead,th1520-gpu compatible, ensuring this rule
   requires a minimum of two power domains only for non TH1520 B-series
   GPU's.

This makes the binding strict and correct for both the specific TH1520
implementation and for other SoCs that use the B-series Rogue GPUs.

Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski at linaro.org>
Reviewed-by: Ulf Hansson <ulf.hansson at linaro.org>
Reviewed-by: Bartosz Golaszewski <bartosz.golaszewski at linaro.org>
Signed-off-by: Michal Wilczynski <m.wilczynski at samsung.com>
---
 .../devicetree/bindings/gpu/img,powervr-rogue.yaml | 32 +++++++++++++++++++++-
 1 file changed, 31 insertions(+), 1 deletion(-)

diff --git a/Documentation/devicetree/bindings/gpu/img,powervr-rogue.yaml b/Documentation/devicetree/bindings/gpu/img,powervr-rogue.yaml
index 4450e2e73b3ccf74d29f0e31e2e6687d7cbe5d65..2c5c278b730145a983d1ddfa4014b3c5046bcd52 100644
--- a/Documentation/devicetree/bindings/gpu/img,powervr-rogue.yaml
+++ b/Documentation/devicetree/bindings/gpu/img,powervr-rogue.yaml
@@ -21,6 +21,11 @@ properties:
           # work with newer dts.
           - const: img,img-axe
           - const: img,img-rogue
+      - items:
+          - enum:
+              - thead,th1520-gpu
+          - const: img,img-bxm-4-64
+          - const: img,img-rogue
       - items:
           - enum:
               - ti,j721s2-gpu
@@ -84,11 +89,29 @@ allOf:
         compatible:
           contains:
             const: img,img-rogue
+      not:
+        properties:
+          compatible:
+            contains:
+              const: thead,th1520-gpu
     then:
       required:
         - power-domains
         - power-domain-names
 
+  - if:
+      properties:
+        compatible:
+          contains:
+            const: thead,th1520-gpu
+    then:
+      required:
+        - power-domains
+      properties:
+        power-domains:
+          maxItems: 1
+        power-domain-names: false
+
   - if:
       properties:
         compatible:
@@ -105,7 +128,14 @@ allOf:
       properties:
         compatible:
           contains:
-            const: img,img-bxs-4-64
+            enum:
+              - img,img-bxm-4-64
+              - img,img-bxs-4-64
+      not:
+        properties:
+          compatible:
+            contains:
+              const: thead,th1520-gpu
     then:
       properties:
         power-domains:

-- 
2.34.1