[PATCH v4 3/3] dt-bindings: imx6q-pcie: Handle more resets on legacy platforms

[Marek Vasut]

The i.MX6 and i.MX7D does not use block controller to toggle PCIe
reset, hence the PCIe DT description contains three reset entries
on these older SoCs. Add this exception into the binding document.

Signed-off-by: Marek Vasut <marex at denx.de>
---
Cc: Fabio Estevam <festevam at gmail.com>
Cc: Krzysztof Kozlowski <krzysztof.kozlowski+dt at linaro.org>
Cc: Lucas Stach <l.stach at pengutronix.de>
Cc: Richard Zhu <hongxing.zhu at nxp.com>
Cc: Rob Herring <robh+dt at kernel.org>
Cc: Shawn Guo <shawnguo at kernel.org>
Cc: linux-arm-kernel at lists.infradead.org
Cc: NXP Linux Team <linux-imx at nxp.com>
To: devicetree at vger.kernel.org
---
V2: - Add mx8mq to 3-reset PCIe core variant
    - Handle the resets in allOf section
V3: - Reinstate reset: maxItems:3 and add minItems:2
    - Move reset-names back to main section
    - The validation no longer works and introduces errors like these:
      arch/arm64/boot/dts/freescale/imx8mm-verdin-wifi-dahlia.dtb: pcie at 33800000: reset-names:0: 'pciephy' was expected
V4: - Reinstate reset minItems and maxItems
    - Turn the first two reset-names items into enums to cover all
      the various name combinations, sort the rest in allOf section
---
 .../bindings/pci/fsl,imx6q-pcie.yaml          | 34 +++++++++++++++++--
 1 file changed, 32 insertions(+), 2 deletions(-)

diff --git a/Documentation/devicetree/bindings/pci/fsl,imx6q-pcie.yaml b/Documentation/devicetree/bindings/pci/fsl,imx6q-pcie.yaml
index b14c12a47cc1c..46fc29384ed34 100644
--- a/Documentation/devicetree/bindings/pci/fsl,imx6q-pcie.yaml
+++ b/Documentation/devicetree/bindings/pci/fsl,imx6q-pcie.yaml
@@ -84,14 +84,16 @@ properties:
       - const: pcie_phy
 
   resets:
+    minItems: 2
     maxItems: 3
     description: Phandles to PCIe-related reset lines exposed by SRC
       IP block. Additional required by imx7d-pcie and imx8mq-pcie.
 
   reset-names:
+    minItems: 2
     items:
-      - const: pciephy
-      - const: apps
+      - enum: [ pciephy, apps ]
+      - enum: [ apps, turnoff ]
       - const: turnoff
 
   fsl,tx-deemph-gen1:
@@ -283,6 +285,34 @@ allOf:
           maxItems: 1
         power-domain-names: false
 
+  - if:
+      properties:
+        compatible:
+          contains:
+            enum:
+              - fsl,imx6q-pcie
+              - fsl,imx6sx-pcie
+              - fsl,imx6qp-pcie
+              - fsl,imx7d-pcie
+              - fsl,imx8mq-pcie
+    then:
+      properties:
+        resets:
+          minItems: 3
+        reset-names:
+          items:
+            - const: pciephy
+            - const: apps
+            - const: turnoff
+    else:
+      properties:
+        resets:
+          maxItems: 2
+        reset-names:
+          items:
+            - const: apps
+            - const: turnoff
+
 examples:
   - |
     #include <dt-bindings/clock/imx6qdl-clock.h>
-- 
2.35.1