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Message-ID: <20250530111917.1495023-4-claudiu.beznea.uj@bp.renesas.com>
Date: Fri, 30 May 2025 14:19:12 +0300
From: Claudiu <claudiu.beznea@...on.dev>
To: bhelgaas@...gle.com,
	lpieralisi@...nel.org,
	kw@...ux.com,
	manivannan.sadhasivam@...aro.org,
	robh@...nel.org,
	krzk+dt@...nel.org,
	conor+dt@...nel.org,
	geert+renesas@...der.be,
	magnus.damm@...il.com,
	mturquette@...libre.com,
	sboyd@...nel.org,
	p.zabel@...gutronix.de
Cc: claudiu.beznea@...on.dev,
	linux-pci@...r.kernel.org,
	linux-renesas-soc@...r.kernel.org,
	devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	linux-clk@...r.kernel.org,
	john.madieu.xa@...renesas.com,
	Claudiu Beznea <claudiu.beznea.uj@...renesas.com>
Subject: [PATCH v2 3/8] dt-bindings: PCI: renesas,r9a08g045s33-pcie: Add documentation for the PCIe IP on Renesas RZ/G3S

From: Claudiu Beznea <claudiu.beznea.uj@...renesas.com>

The PCIe IP available on the Renesas RZ/G3S complies with the PCI Express
Base Specification 4.0. It is designed for root complex applications and
features a single-lane (x1) implementation. Add documentation for it.

Signed-off-by: Claudiu Beznea <claudiu.beznea.uj@...renesas.com>
---

Changes in v2:
- update the interrupt names by dropping "int" and "rc" string; due
  to this the patch description was adjusted
- added "interrupt-controller" and made it mandatory
- s/clkl1pm/pm/g
- dropped the legacy-interrupt-controller node; with this the gic
  interrupt controller node was dropped as well as it is not needed
  anymore
- updated interrupt-map in example and added interrupt-controller
- added clock-names as required property as the pm clock is not
  handled though PM domains; this will allow the driver to have
  the option to request the pm clock by its name when implementation
  will be adjusted to used the pm clock
- adjusted the size of dma-ranges to reflect the usage on
  SMARC module board
- moved "renesas,sysc" at the end of the node in example to align
  with dts coding style

 .../pci/renesas,r9a08g045s33-pcie.yaml        | 202 ++++++++++++++++++
 1 file changed, 202 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/pci/renesas,r9a08g045s33-pcie.yaml

diff --git a/Documentation/devicetree/bindings/pci/renesas,r9a08g045s33-pcie.yaml b/Documentation/devicetree/bindings/pci/renesas,r9a08g045s33-pcie.yaml
new file mode 100644
index 000000000000..8ba30c084d1b
--- /dev/null
+++ b/Documentation/devicetree/bindings/pci/renesas,r9a08g045s33-pcie.yaml
@@ -0,0 +1,202 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/pci/renesas,r9a08g045s33-pcie.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Renesas RZ/G3S PCIe host controller
+
+maintainers:
+  - Claudiu Beznea <claudiu.beznea.uj@...renesas.com>
+
+description:
+  Renesas RZ/G3S PCIe host controller complies with PCIe Base Specification
+  4.0 and supports up to 5 GT/s (Gen2).
+
+properties:
+  compatible:
+    const: renesas,r9a08g045s33-pcie # RZ/G3S
+
+  reg:
+    maxItems: 1
+
+  interrupts:
+    items:
+      - description: System error interrupt
+      - description: System error on correctable error interrupt
+      - description: System error on non-fatal error interrupt
+      - description: System error on fatal error interrupt
+      - description: AXI error interrupt
+      - description: INTA interrupt
+      - description: INTB interrupt
+      - description: INTC interrupt
+      - description: INTD interrupt
+      - description: MSI interrupt
+      - description: Link bandwidth interrupt
+      - description: PME interrupt
+      - description: DMA interrupt
+      - description: PCIe event interrupt
+      - description: Message interrupt
+      - description: All interrupts
+
+  interrupt-names:
+    items:
+      - description: serr
+      - description: ser_cor
+      - description: serr_nonfatal
+      - description: serr_fatal
+      - description: axi_err
+      - description: inta
+      - description: intb
+      - description: intc
+      - description: intd
+      - description: msi
+      - description: link_bandwidth
+      - description: pm_pme
+      - description: dma
+      - description: pcie_evt
+      - description: msg
+      - description: all
+
+  interrupt-controller: true
+
+  clocks:
+    items:
+      - description: System clock
+      - description: PM control clock
+
+  clock-names:
+    items:
+      - description: aclk
+      - description: pm
+
+  resets:
+    items:
+      - description: AXI2PCIe Bridge reset
+      - description: Data link layer/transaction layer reset
+      - description: Transaction layer (ACLK domain) reset
+      - description: Transaction layer (PCLK domain) reset
+      - description: Physical layer reset
+      - description: Configuration register reset
+      - description: Configuration register reset
+
+  reset-names:
+    items:
+      - description: aresetn
+      - description: rst_b
+      - description: rst_gp_b
+      - description: rst_ps_b
+      - description: rst_rsm_b
+      - description: rst_cfg_b
+      - description: rst_load_b
+
+  power-domains:
+    maxItems: 1
+
+  dma-ranges:
+    description:
+      A single range for the inbound memory region.
+    maxItems: 1
+
+  renesas,sysc:
+    description: System controller phandle
+    $ref: /schemas/types.yaml#/definitions/phandle
+
+  vendor-id:
+    const: 0x1912
+
+  device-id:
+    const: 0x0033
+
+required:
+  - compatible
+  - reg
+  - clocks
+  - clock-names
+  - resets
+  - reset-names
+  - interrupts
+  - interrupt-names
+  - interrupt-map
+  - interrupt-map-mask
+  - interrupt-controller
+  - power-domains
+  - "#address-cells"
+  - "#size-cells"
+  - "#interrupt-cells"
+  - renesas,sysc
+  - vendor-id
+  - device-id
+
+allOf:
+  - $ref: /schemas/pci/pci-host-bridge.yaml#
+
+unevaluatedProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/clock/r9a08g045-cpg.h>
+    #include <dt-bindings/interrupt-controller/arm-gic.h>
+
+    bus {
+        #address-cells = <2>;
+        #size-cells = <2>;
+
+        pcie@...40000 {
+            compatible = "renesas,r9a08g045s33-pcie";
+            reg = <0 0x11e40000 0 0x10000>;
+            ranges = <0x03000000 0 0x30000000 0 0x30000000 0 0x8000000>;
+            dma-ranges = <0x42000000 0 0x48000000 0 0x48000000 0 0x38000000>;
+            bus-range = <0x0 0xff>;
+            clocks = <&cpg CPG_MOD R9A08G045_PCI_ACLK>,
+                     <&cpg CPG_MOD R9A08G045_PCI_CLKL1PM>;
+            clock-names = "aclk", "pm";
+            resets = <&cpg R9A08G045_PCI_ARESETN>,
+                     <&cpg R9A08G045_PCI_RST_B>,
+                     <&cpg R9A08G045_PCI_RST_GP_B>,
+                     <&cpg R9A08G045_PCI_RST_PS_B>,
+                     <&cpg R9A08G045_PCI_RST_RSM_B>,
+                     <&cpg R9A08G045_PCI_RST_CFG_B>,
+                     <&cpg R9A08G045_PCI_RST_LOAD_B>;
+            reset-names = "aresetn", "rst_b", "rst_gp_b", "rst_ps_b",
+                          "rst_rsm_b", "rst_cfg_b", "rst_load_b";
+            interrupts = <GIC_SPI 395 IRQ_TYPE_LEVEL_HIGH>,
+                         <GIC_SPI 396 IRQ_TYPE_LEVEL_HIGH>,
+                         <GIC_SPI 397 IRQ_TYPE_LEVEL_HIGH>,
+                         <GIC_SPI 398 IRQ_TYPE_LEVEL_HIGH>,
+                         <GIC_SPI 399 IRQ_TYPE_LEVEL_HIGH>,
+                         <GIC_SPI 400 IRQ_TYPE_LEVEL_HIGH>,
+                         <GIC_SPI 401 IRQ_TYPE_LEVEL_HIGH>,
+                         <GIC_SPI 402 IRQ_TYPE_LEVEL_HIGH>,
+                         <GIC_SPI 403 IRQ_TYPE_LEVEL_HIGH>,
+                         <GIC_SPI 404 IRQ_TYPE_LEVEL_HIGH>,
+                         <GIC_SPI 405 IRQ_TYPE_LEVEL_HIGH>,
+                         <GIC_SPI 406 IRQ_TYPE_LEVEL_HIGH>,
+                         <GIC_SPI 407 IRQ_TYPE_LEVEL_HIGH>,
+                         <GIC_SPI 408 IRQ_TYPE_LEVEL_HIGH>,
+                         <GIC_SPI 409 IRQ_TYPE_LEVEL_HIGH>,
+                         <GIC_SPI 410 IRQ_TYPE_LEVEL_HIGH>;
+            interrupt-names = "serr", "serr_cor", "serr_nonfatal",
+                              "serr_fatal", "axi_err", "inta",
+                              "intb", "intc", "intd", "msi",
+                              "link_bandwidth", "pm_pme", "dma",
+                              "pcie_evt", "msg", "all";
+            #interrupt-cells = <1>;
+            interrupt-controller;
+            interrupt-map-mask = <0 0 0 7>;
+            interrupt-map = <0 0 0 1 &pcie 0 0 0 0>, /* INT A */
+                            <0 0 0 2 &pcie 0 0 0 1>, /* INT B */
+                            <0 0 0 3 &pcie 0 0 0 2>, /* INT C */
+                            <0 0 0 4 &pcie 0 0 0 3>; /* INT D */
+            device_type = "pci";
+            num-lanes = <1>;
+            #address-cells = <3>;
+            #size-cells = <2>;
+            power-domains = <&cpg>;
+            vendor-id = <0x1912>;
+            device-id = <0x0033>;
+            renesas,sysc = <&sysc>;
+        };
+    };
+
+...
-- 
2.43.0


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