dt-bindings: misc: Add device specific bindings for RaspberryPi RP1

The RP1 is a MFD that exposes its peripherals through PCI BARs. This
schema is intended as minimal support for the clock generator and
gpio controller peripherals which are accessible through BAR1.

Signed-off-by: Andrea della Porta <andrea.porta@suse.com>
Reviewed-by: Rob Herring (Arm) <robh@kernel.org>
Reviewed-by: Florian Fainelli <florian.fainelli@broadcom.com>
Link: https://lore.kernel.org/r/20250529135052.28398-3-andrea.porta@suse.com
Signed-off-by: Florian Fainelli <florian.fainelli@broadcom.com>

Documentation/devicetree/bindings/misc/pci1de4,1.yaml

@@ -0,0 +1,137 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/misc/pci1de4,1.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: RaspberryPi RP1 MFD PCI device
+
+maintainers:
+  - A. della Porta <andrea.porta@suse.com>
+
+description:
+  The RaspberryPi RP1 is a PCI multi function device containing
+  peripherals ranging from Ethernet to USB controller, I2C, SPI
+  and others.
+  The peripherals are accessed by addressing the PCI BAR1 region.
+
+allOf:
+  - $ref: /schemas/pci/pci-ep-bus.yaml
+
+properties:
+  compatible:
+    additionalItems: true
+    maxItems: 3
+    items:
+      - const: pci1de4,1
+
+  '#interrupt-cells':
+    const: 2
+    description: |
+      Specifies respectively the interrupt number and flags as defined
+      in include/dt-bindings/interrupt-controller/irq.h.
+      Since all interrupts are active high, only IRQ_TYPE_LEVEL_HIGH
+      and IRQ_TYPE_EDGE_RISING can be specified as type flags.
+      The supported values for the interrupt number are:
+        - IO BANK0: 0
+        - IO BANK1: 1
+        - IO BANK2: 2
+        - AUDIO IN: 3
+        - AUDIO OUT: 4
+        - PWM0: 5
+        - ETH: 6
+        - I2C0: 7
+        - I2C1: 8
+        - I2C2: 9
+        - I2C3: 10
+        - I2C4: 11
+        - I2C5: 12
+        - I2C6: 13
+        - I2S0: 14
+        - I2S1: 15
+        - I2S2: 16
+        - SDIO0: 17
+        - SDIO1: 18
+        - SPI0: 19
+        - SPI1: 20
+        - SPI2: 21
+        - SPI3: 22
+        - SPI4: 23
+        - SPI5: 24
+        - UART0: 25
+        - TIMER0: 26
+        - TIMER1: 27
+        - TIMER2: 28
+        - TIMER3: 29
+        - USB HOST0: 30
+        - USB HOST0-0: 31
+        - USB HOST0-1: 32
+        - USB HOST0-2: 33
+        - USB HOST0-3: 34
+        - USB HOST1: 35
+        - USB HOST1-0: 36
+        - USB HOST1-1: 37
+        - USB HOST1-2: 38
+        - USB HOST1-3: 39
+        - DMA: 40
+        - PWM1: 41
+        - UART1: 42
+        - UART2: 43
+        - UART3: 44
+        - UART4: 45
+        - UART5: 46
+        - MIPI0: 47
+        - MIPI1: 48
+        - VIDEO OUT: 49
+        - PIO0: 50
+        - PIO1: 51
+        - ADC FIFO: 52
+        - PCIE OUT: 53
+        - SPI6: 54
+        - SPI7: 55
+        - SPI8: 56
+        - PROC MISC: 57
+        - SYSCFG: 58
+        - CLOCKS DEFAULT: 59
+        - VBUSCTRL: 60
+
+  interrupt-controller: true
+
+unevaluatedProperties: false
+
+required:
+  - compatible
+  - '#interrupt-cells'
+  - interrupt-controller
+  - pci-ep-bus@1
+
+examples:
+  - |
+    pci {
+        #address-cells = <3>;
+        #size-cells = <2>;
+
+        rp1@0,0 {
+            compatible = "pci1de4,1";
+            ranges = <0x01 0x00 0x00000000  0x82010000 0x00 0x00  0x00 0x400000>;
+            #address-cells = <3>;
+            #size-cells = <2>;
+            interrupt-controller;
+            #interrupt-cells = <2>;
+
+            pci_ep_bus: pci-ep-bus@1 {
+                compatible = "simple-bus";
+                ranges = <0x00 0x40000000  0x01 0x00 0x00000000  0x00 0x00400000>;
+                dma-ranges = <0x10 0x00000000  0x43000000 0x10 0x00000000  0x10 0x00000000>;
+                #address-cells = <2>;
+                #size-cells = <2>;
+
+                rp1_clocks: clocks@40018000 {
+                    compatible = "raspberrypi,rp1-clocks";
+                    reg = <0x00 0x40018000 0x0 0x10038>;
+                    #clock-cells = <1>;
+                    clocks = <&clk_rp1_xosc>;
+                };
+            };
+        };
+    };