linux-kernel - [PATCH 2/7] dt-bindings: pci: Add document for ASPEED PCIe Config

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Message-ID: <20250613033001.3153637-3-jacky_chou@aspeedtech.com>
Date: Fri, 13 Jun 2025 11:29:56 +0800
From: Jacky Chou <jacky_chou@...eedtech.com>
To: <bhelgaas@...gle.com>, <lpieralisi@...nel.org>, <kwilczynski@...nel.org>,
	<mani@...nel.org>, <robh@...nel.org>, <krzk+dt@...nel.org>,
	<conor+dt@...nel.org>, <joel@....id.au>, <andrew@...econstruct.com.au>,
	<vkoul@...nel.org>, <kishon@...nel.org>, <linus.walleij@...aro.org>,
	<p.zabel@...gutronix.de>, <linux-aspeed@...ts.ozlabs.org>,
	<linux-pci@...r.kernel.org>, <devicetree@...r.kernel.org>,
	<linux-arm-kernel@...ts.infradead.org>, <linux-kernel@...r.kernel.org>,
	<linux-phy@...ts.infradead.org>, <openbmc@...ts.ozlabs.org>,
	<linux-gpio@...r.kernel.org>
CC: <elbadrym@...gle.com>, <romlem@...gle.com>, <anhphan@...gle.com>,
	<wak@...gle.com>, <yuxiaozhang@...gle.com>, <BMC-SW@...eedtech.com>
Subject: [PATCH 2/7] dt-bindings: pci: Add document for ASPEED PCIe Config

Add device tree binding documentation for the ASPEED AST2600/AST2700 PCIe
configuration syscon block. This shared register space is used by multiple
PCIe-related devices to coordinate and manage common PCIe settings.
The binding describes the required compatible strings and register space
for the configuration node.

Signed-off-by: Jacky Chou <jacky_chou@...eedtech.com>
---
 .../bindings/pci/aspeed-pcie-cfg.yaml         | 41 +++++++++++++++++++
 1 file changed, 41 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/pci/aspeed-pcie-cfg.yaml

diff --git a/Documentation/devicetree/bindings/pci/aspeed-pcie-cfg.yaml b/Documentation/devicetree/bindings/pci/aspeed-pcie-cfg.yaml
new file mode 100644
index 000000000000..6b51eedf4c47
--- /dev/null
+++ b/Documentation/devicetree/bindings/pci/aspeed-pcie-cfg.yaml
@@ -0,0 +1,41 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/pci/aspeed-pcie-cfg.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: ASPEED PCIe Configuration
+
+maintainers:
+  - Jacky Chou <jacky_chou@...eedtech.com>
+
+description: |
+  The ASPEED PCIe configuration syscon block provides a set of registers shared
+  by multiple PCIe-related devices within the SoC. This node represents the
+  common configuration space that allows these devices to coordinate and manage
+  shared PCIe settings, including address mapping, control, and status
+  registers. The syscon interface enables Linux drivers for various PCIe devices
+  to access  and modify these shared registers in a consistent and centralized
+  manner.
+
+properties:
+  compatible:
+    enum:
+      - aspeed,ast2600-pcie-cfg
+      - aspeed,ast2700-pcie-cfg
+
+  reg:
+    maxItems: 1
+
+required:
+  - compatible
+  - reg
+
+additionalProperties: false
+
+examples:
+  - |
+    pcie-cfg@...70000 {
+      compatible = "aspeed,ast2600-pcie-cfg";
+      reg = <0x1e770000 0x80>;
+    };
-- 
2.43.0