[PATCH v2] dt-bindings: renesas: Document preferred compatible naming

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Compatibles can come in two formats. Either "vendor,ip-soc" or
"vendor,soc-ip". Add a DT schema file documenting Renesas preferred
policy and enforcing it for all new compatibles, except few existing
patterns.

Suggested-by: Krzysztof Kozlowski <krzysztof.kozlowski@xxxxxxxxxx>
Signed-off-by: Niklas Söderlund <niklas.soderlund+renesas@xxxxxxxxxxxx>
---
* Changes since v1
- Split the "SoC agnostic compatibles" section into two to make it's
  intent clearer.
- Improved the documentation for each group of compatibles.
- Reduced the number of regexp to create a larger target area. As
  suggested by Krzysztof the goal is not to validate each SoC name but
  check for the correct order of SoC-IP.

* Changes since RFC
- Moved to Documentation/devicetree/bindings/soc/renesas.
- Changed the pattern in the initial select to match on .*-.*.
- Added a lot of missing compatible values.
---
 .../bindings/soc/renesas/renesas-soc.yaml     | 135 ++++++++++++++++++
 1 file changed, 135 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/soc/renesas/renesas-soc.yaml

diff --git a/Documentation/devicetree/bindings/soc/renesas/renesas-soc.yaml b/Documentation/devicetree/bindings/soc/renesas/renesas-soc.yaml
new file mode 100644
index 000000000000..91310d23cf0b
--- /dev/null
+++ b/Documentation/devicetree/bindings/soc/renesas/renesas-soc.yaml
@@ -0,0 +1,135 @@
+# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/soc/renesas/renesas-soc.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Renesas SoC compatibles naming convention
+
+maintainers:
+  - Geert Uytterhoeven <geert+renesas@xxxxxxxxx>
+  - Niklas Söderlund <niklas.soderlund@xxxxxxxxxxxx>
+
+description: |
+  Guidelines for new compatibles for SoC blocks/components.
+  When adding new compatibles in new bindings, use the format::
+    renesas,SoC-IP
+
+  For example::
+   renesas,r8a77965-csi2
+
+  When adding new compatibles to existing bindings, use the format in the
+  existing binding, even if it contradicts the above.
+
+select:
+  properties:
+    compatible:
+      pattern: "^renesas,.*-.*$"
+  required:
+    - compatible
+
+properties:
+  compatible:
+    oneOf:
+      # Preferred naming style for compatibles of SoC components
+      - pattern: "^renesas,emev2-[a-z0-9-]+$"
+      - pattern: "^renesas,r(7s|8a|9a)[a-z0-9]+-[a-z0-9-]+$"
+      - pattern: "^renesas,rcar-[a-z0-9-]+$"
+      - pattern: "^renesas,rz[a-z0-9]*-[a-z0-9-]+$"
+      - pattern: "^renesas,sh-[a-z0-9-]+$"
+      - pattern: "^renesas,sh7[a-z0-9]+-[a-z0-9-]+$"
+
+      # Fallback compatibles
+      #
+      # Some SoC components in addition to a specific SoC compatible have a
+      # generic fallback compatible. For example the Interrupt Controller,
+      #
+      #   compatible = "renesas,intc-irqpin-r8a7740", "renesas,intc-irqpin";
+      #
+      # This is OK and new fallback compatibles are allowed.
+      - enum:
+          - renesas,cpg-div6-clock
+          - renesas,cpg-mstp-clocks
+          - renesas,intc-irqpin
+
+      # Legacy compatibles
+      #
+      # New compatibles are not allowed but new variations of existing
+      # patterns/compatibles are.
+      - pattern: "^renesas,can-[a-z0-9]+$"
+      - pattern: "^renesas,dmac-[a-z0-9]+$"
+      - pattern: "^renesas,du-[a-z0-9]+$"
+      - pattern: "^renesas,ether-[a-z0-9]+$"
+      - pattern: "^renesas,etheravb-[a-z0-9]+$"
+      - pattern: "^renesas,etheravb-rcar-gen[0-9]$"
+      - pattern: "^renesas,gether-[a-z0-9]+$"
+      - pattern: "^renesas,gpio-[a-z0-9]+$"
+      - pattern: "^renesas,hscif-[a-z0-9]+$"
+      - pattern: "^renesas,i2c-[a-z0-9]+$"
+      - pattern: "^renesas,iic-[a-z0-9]+$"
+      - pattern: "^renesas,intc-ex-[a-z0-9]+$"
+      - pattern: "^renesas,intc-irqpin-[a-z0-9]+$"
+      - pattern: "^renesas,ipmmu-[a-z0-9]+$"
+      - pattern: "^renesas,irqc-[a-z0-9]+$"
+      - pattern: "^renesas,jpu-[a-z0-9]+$"
+      - pattern: "^renesas,mmcif-[a-z0-9]+$"
+      - pattern: "^renesas,msiof-[a-z0-9]+$"
+      - pattern: "^renesas,pci-[a-z0-9]+$"
+      - pattern: "^renesas,pci-rcar-gen[0-9]$"
+      - pattern: "^renesas,pcie-[a-z0-9]+$"
+      - pattern: "^renesas,pcie-rcar-gen[0-9]$"
+      - pattern: "^renesas,pfc-[a-z0-9]+$"
+      - pattern: "^renesas,pwm-[a-z0-9]+$"
+      - pattern: "^renesas,qspi-[a-z0-9]+$"
+      - pattern: "^renesas,rcar_sound-[a-z0-9]+$"
+      - pattern: "^renesas,riic-[a-z0-9]+$"
+      - pattern: "^renesas,rspi-[a-z0-9]+$"
+      - pattern: "^renesas,sata-[a-z0-9]+(-es1)?$"
+      - pattern: "^renesas,scif-[a-z0-9]+$"
+      - pattern: "^renesas,scifa-[a-z0-9]+$"
+      - pattern: "^renesas,scifb-[a-z0-9]+$"
+      - pattern: "^renesas,sdhi-[a-z0-9]+$"
+      - pattern: "^renesas,thermal-[a-z0-9]+$"
+      - pattern: "^renesas,tmu-[a-z0-9]+$"
+      - pattern: "^renesas,tpu-[a-z0-9]+$"
+      - pattern: "^renesas,usb-phy-[a-z0-9]+$"
+      - pattern: "^renesas,usb2-phy-[a-z0-9]+$"
+      - pattern: "^renesas,usbhs-[a-z0-9]+$"
+      - pattern: "^renesas,vin-[a-z0-9]+$"
+      - pattern: "^renesas,xhci-[a-z0-9]+$"
+
+      # Fixed legacy compatibles
+      #
+      # List cannot grow with new bindings.
+      - enum:
+          - renesas,bsc-r8a73a4
+          - renesas,bsc-sh73a0
+          - renesas,dbsc-r8a73a4
+          - renesas,dbsc3-r8a7740
+          - renesas,em-gio
+          - renesas,em-sti
+          - renesas,em-uart
+          - renesas,fsi2-r8a7740
+          - renesas,fsi2-sh73a0
+          - renesas,hspi-r8a7778
+          - renesas,hspi-r8a7779
+          - renesas,imr-lx4
+          - renesas,mtu2-r7s72100
+          - renesas,rmobile-iic
+          - renesas,sbsc-sh73a0
+          - renesas,sdhi-mmc-r8a77470
+          - renesas,shmobile-flctl-sh7372
+          - renesas,sysc-r8a73a4
+          - renesas,sysc-r8a7740
+          - renesas,sysc-rmobile
+          - renesas,sysc-sh73a0
+          - renesas,usb-dmac
+
+      # None SoC component compatibles
+      #
+      # Compatibles with the Renesas vendor prefix that do not relate to any SoC
+      # component are OK. New compatibles are allowed.
+      - enum:
+          - renesas,smp-sram
+
+additionalProperties: true
-- 
2.43.0





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