[RFC][PATCH v3 2/3] dt-bindings: imx6q-pcie: Handle various PD configurations

[Marek Vasut <marex@denx.de>]

The i.MX SoCs have various power domain configurations routed into
the PCIe IP. MX6SX is the only one which contains 2 domains and also
uses power-domain-names. MX6QDL do not use any domains. All the rest
uses one domain and does not use power-domain-names anymore.

Document all those configurations in the DT binding document.

Signed-off-by: Marek Vasut <marex@denx.de>
---
Cc: Fabio Estevam <festevam@gmail.com>
Cc: Krzysztof Kozlowski <krzysztof.kozlowski+dt@linaro.org>
Cc: Lucas Stach <l.stach@pengutronix.de>
Cc: Richard Zhu <hongxing.zhu@nxp.com>
Cc: Rob Herring <robh+dt@kernel.org>
Cc: Shawn Guo <shawnguo@kernel.org>
Cc: linux-arm-kernel@lists.infradead.org
Cc: NXP Linux Team <linux-imx@nxp.com>
To: devicetree@vger.kernel.org
---
V2: - Keep the power-domains description in the main section
V3: - Move power-domains back where they were originally (fixes V2)
    - Do not use else: in allOf section
---
 .../bindings/pci/fsl,imx6q-pcie.yaml          | 31 ++++++++++++++++++-
 1 file changed, 30 insertions(+), 1 deletion(-)

diff --git a/Documentation/devicetree/bindings/pci/fsl,imx6q-pcie.yaml b/Documentation/devicetree/bindings/pci/fsl,imx6q-pcie.yaml
index 44c65d3ec07b9..5d731aca34b4d 100644
--- a/Documentation/devicetree/bindings/pci/fsl,imx6q-pcie.yaml
+++ b/Documentation/devicetree/bindings/pci/fsl,imx6q-pcie.yaml
@@ -67,13 +67,13 @@ properties:
       required properties for imx7d-pcie and imx8mq-pcie.
 
   power-domains:
+    minItems: 1
     items:
       - description: The phandle pointing to the DISPLAY domain for
           imx6sx-pcie, to PCIE_PHY power domain for imx7d-pcie and
           imx8mq-pcie.
       - description: The phandle pointing to the PCIE_PHY power domains
           for imx6sx-pcie.
-
   power-domain-names:
     items:
       - const: pcie
@@ -222,6 +222,35 @@ allOf:
             - const: pcie_bus
             - const: pcie_aux
 
+  - if:
+      properties:
+        compatible:
+          contains:
+            const: fsl,imx6sx-pcie
+    then:
+      properties:
+        power-domains:
+          minItems: 2
+          maxItems: 2
+        power-domain-names:
+          minItems: 2
+          maxItems: 2
+
+  - if:
+      not:
+        properties:
+          compatible:
+            contains:
+              enum:
+                - fsl,imx6q-pcie
+                - fsl,imx6qp-pcie
+    then:
+      properties:
+        power-domains:
+          minItems: 1
+          maxItems: 1
+        power-domain-names: false
+
 examples:
   - |
     #include <dt-bindings/clock/imx6qdl-clock.h>
-- 
2.35.1