[PATCH v4 1/3] dt-bindings: imx6q-pcie: Handle various clock configurations

[Marek Vasut <marex@denx.de>]

The i.MX SoCs have various clock configurations routed into the PCIe IP,
the list of clock is below. Document all those configurations in the DT
binding document.

All SoCs: pcie, pcie_bus
6QDL, 7D: + pcie_phy
6SX:      + pcie_phy          pcie_inbound_axi
8MQ:      + pcie_phy pcie_aux
8MM, 8MP: +          pcie_aux

Acked-by: Alexander Stein <alexander.stein@ew.tq-group.com>
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: - Add AB from Alex
V3: - Duplicate clock-names maxItems to mx6sx and mx8mq compatibles
    - Flatten the if-else structure
    - The validation no longer works and introduces errors like these:
      arch/arm64/boot/dts/freescale/imx8mm-verdin-wifi-dahlia.dtb: pcie@33800000: clock-names:2: 'pcie_phy' was expected
V4: - Reinstate minItems: for clock-names in main section, turn the
      last two clock-names items into enums to cover all IP variants.
    - Add another allOf entry for mx6q/mx6qp/mx7d clock-names list.
    - Adjust clock maxItems in the allOf section.
---
 .../bindings/pci/fsl,imx6q-pcie.yaml          | 73 +++++++++++++++++--
 1 file changed, 68 insertions(+), 5 deletions(-)

diff --git a/Documentation/devicetree/bindings/pci/fsl,imx6q-pcie.yaml b/Documentation/devicetree/bindings/pci/fsl,imx6q-pcie.yaml
index 376e739bcad40..2df73be0ffbea 100644
--- a/Documentation/devicetree/bindings/pci/fsl,imx6q-pcie.yaml
+++ b/Documentation/devicetree/bindings/pci/fsl,imx6q-pcie.yaml
@@ -14,9 +14,6 @@ description: |+
   This PCIe host controller is based on the Synopsys DesignWare PCIe IP
   and thus inherits all the common properties defined in snps,dw-pcie.yaml.
 
-allOf:
-  - $ref: /schemas/pci/snps,dw-pcie.yaml#
-
 properties:
   compatible:
     enum:
@@ -60,8 +57,8 @@ properties:
     items:
       - const: pcie
       - const: pcie_bus
-      - const: pcie_phy
-      - const: pcie_inbound_axi for imx6sx-pcie, pcie_aux for imx8mq-pcie
+      - enum: [ pcie_phy, pcie_aux ]
+      - enum: [ pcie_aux, pcie_inbound_axi ]
 
   num-lanes:
     const: 1
@@ -177,6 +174,72 @@ required:
 
 unevaluatedProperties: false
 
+allOf:
+  - $ref: /schemas/pci/snps,dw-pcie.yaml#
+
+  - if:
+      properties:
+        compatible:
+          contains:
+            enum:
+              - fsl,imx6q-pcie
+              - fsl,imx6qp-pcie
+              - fsl,imx7d-pcie
+    then:
+      properties:
+        clocks:
+          maxItems: 3
+        clock-names:
+          items:
+            - const: pcie
+            - const: pcie_bus
+            - const: pcie_phy
+
+  - if:
+      properties:
+        compatible:
+          contains:
+            const: fsl,imx6sx-pcie
+    then:
+      properties:
+        clock-names:
+          items:
+            - const: pcie
+            - const: pcie_bus
+            - const: pcie_phy
+            - const: pcie_inbound_axi
+
+  - if:
+      properties:
+        compatible:
+          contains:
+            const: fsl,imx8mq-pcie
+    then:
+      properties:
+        clock-names:
+          items:
+            - const: pcie
+            - const: pcie_bus
+            - const: pcie_phy
+            - const: pcie_aux
+
+  - if:
+      properties:
+        compatible:
+          contains:
+            enum:
+              - fsl,imx8mm-pcie
+              - fsl,imx8mp-pcie
+    then:
+      properties:
+        clocks:
+          maxItems: 3
+        clock-names:
+          items:
+            - const: pcie
+            - const: pcie_bus
+            - const: pcie_aux
+
 examples:
   - |
     #include <dt-bindings/clock/imx6qdl-clock.h>
-- 
2.35.1