dt-bindings: pci: Add DT binding for Toshiba Visconti PCIe controller

This commit adds the Device Tree binding documentation that allows
to describe the PCIe controller found in Toshiba Visconti SoCs.

Signed-off-by: Nobuhiro Iwamatsu <nobuhiro1.iwamatsu@toshiba.co.jp>
Link: https://lore.kernel.org/r/20210723221421.113575-2-nobuhiro1.iwamatsu@toshiba.co.jp
[robh: reference snps,dw-pcie.yaml]
Signed-off-by: Rob Herring <robh@kernel.org>

Documentation/devicetree/bindings/pci/snps,dw-pcie.yaml

@@ -34,7 +34,8 @@ properties:
     minItems: 2
     maxItems: 5
     items:
-      enum: [dbi, dbi2, config, atu, app, elbi, mgmt, ctrl, parf, cfg, link]
+      enum: [ dbi, dbi2, config, atu, app, elbi, mgmt, ctrl, parf, cfg, link,
+              ulreg, smu, mpu ]
 
   num-lanes:
     description: |

Documentation/devicetree/bindings/pci/toshiba,visconti-pcie.yaml

@@ -0,0 +1,110 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/pci/toshiba,visconti-pcie.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Toshiba Visconti5 SoC PCIe Host Controller Device Tree Bindings
+
+maintainers:
+  - Nobuhiro Iwamatsu <nobuhiro1.iwamatsu@toshiba.co.jp>
+
+description:
+  Toshiba Visconti5 SoC PCIe host controller is based on the Synopsys DesignWare PCIe IP.
+
+allOf:
+  - $ref: /schemas/pci/snps,dw-pcie.yaml#
+
+properties:
+  compatible:
+    const: toshiba,visconti-pcie
+
+  reg:
+    items:
+      - description: Data Bus Interface (DBI) registers.
+      - description: PCIe configuration space region.
+      - description: Visconti specific additional registers.
+      - description: Visconti specific SMU registers
+      - description: Visconti specific memory protection unit registers (MPU)
+
+  reg-names:
+    items:
+      - const: dbi
+      - const: config
+      - const: ulreg
+      - const: smu
+      - const: mpu
+
+  interrupts:
+    maxItems: 1
+
+  clocks:
+    items:
+      - description: PCIe reference clock
+      - description: PCIe system clock
+      - description: Auxiliary clock
+
+  clock-names:
+    items:
+      - const: ref
+      - const: core
+      - const: aux
+
+  num-lanes:
+    const: 2
+
+required:
+  - reg
+  - reg-names
+  - interrupts
+  - "#interrupt-cells"
+  - interrupt-map
+  - interrupt-map-mask
+  - num-lanes
+  - clocks
+  - clock-names
+  - max-link-speed
+
+unevaluatedProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/interrupt-controller/irq.h>
+    #include <dt-bindings/interrupt-controller/arm-gic.h>
+
+    soc {
+        #address-cells = <2>;
+        #size-cells = <2>;
+
+        pcie: pcie@28400000 {
+            compatible = "toshiba,visconti-pcie";
+            reg = <0x0 0x28400000 0x0 0x00400000>,
+                  <0x0 0x70000000 0x0 0x10000000>,
+                  <0x0 0x28050000 0x0 0x00010000>,
+                  <0x0 0x24200000 0x0 0x00002000>,
+                  <0x0 0x24162000 0x0 0x00001000>;
+            reg-names  = "dbi", "config", "ulreg", "smu", "mpu";
+            device_type = "pci";
+            bus-range = <0x00 0xff>;
+            num-lanes = <2>;
+            num-viewport = <8>;
+
+            #address-cells = <3>;
+            #size-cells = <2>;
+            #interrupt-cells = <1>;
+            ranges = <0x81000000 0 0x40000000 0 0x40000000 0 0x00010000>,
+                     <0x82000000 0 0x50000000 0 0x50000000 0 0x20000000>;
+            interrupts = <GIC_SPI 215 IRQ_TYPE_LEVEL_HIGH>;
+            interrupt-names = "intr";
+            interrupt-map-mask = <0 0 0 7>;
+            interrupt-map =
+                <0 0 0 1 &gic GIC_SPI 215 IRQ_TYPE_LEVEL_HIGH
+                 0 0 0 2 &gic GIC_SPI 215 IRQ_TYPE_LEVEL_HIGH
+                 0 0 0 3 &gic GIC_SPI 215 IRQ_TYPE_LEVEL_HIGH
+                 0 0 0 4 &gic GIC_SPI 215 IRQ_TYPE_LEVEL_HIGH>;
+            clocks = <&extclk100mhz>, <&clk600mhz>, <&clk25mhz>;
+            clock-names = "ref", "core", "aux";
+            max-link-speed = <2>;
+        };
+    };
+...