linux-kernel - [PATCH v1 1/2] dt-binding: soc: nuvoton: Add NPCM BPC LPC documentation

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Message-ID: <20221122201232.107065-2-tmaimon77@gmail.com>
Date:   Tue, 22 Nov 2022 22:12:31 +0200
From:   Tomer Maimon <tmaimon77@...il.com>
To:     <avifishman70@...il.com>, <tali.perry1@...il.com>,
        <joel@....id.au>, <venture@...gle.com>, <yuenn@...gle.com>,
        <benjaminfair@...gle.com>, <arnd@...db.de>,
        <hasegawa-hitomi@...itsu.com>, <marcan@...can.st>,
        <nicolas.ferre@...rochip.com>, <conor.dooley@...rochip.com>,
        <heiko@...ech.de>, <sven@...npeter.dev>,
        <briannorris@...omium.org>, <robh+dt@...nel.org>,
        <krzysztof.kozlowski+dt@...aro.org>
CC:     <openbmc@...ts.ozlabs.org>, <linux-kernel@...r.kernel.org>,
        <devicetree@...r.kernel.org>, Tomer Maimon <tmaimon77@...il.com>
Subject: [PATCH v1 1/2] dt-binding: soc: nuvoton: Add NPCM BPC LPC documentation

Added device tree binding documentation for Nuvoton BMC NPCM BIOS Post
Code (BPC).

The NPCM BPC monitoring two configurable I/O addresses written by the
host on Low Pin Count (LPC) bus.

Signed-off-by: Tomer Maimon <tmaimon77@...il.com>
---
 .../bindings/soc/nuvoton/npcm-lpc-bpc.yaml    | 112 ++++++++++++++++++
 1 file changed, 112 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/soc/nuvoton/npcm-lpc-bpc.yaml

diff --git a/Documentation/devicetree/bindings/soc/nuvoton/npcm-lpc-bpc.yaml b/Documentation/devicetree/bindings/soc/nuvoton/npcm-lpc-bpc.yaml
new file mode 100644
index 000000000000..2c8e66546891
--- /dev/null
+++ b/Documentation/devicetree/bindings/soc/nuvoton/npcm-lpc-bpc.yaml
@@ -0,0 +1,112 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/soc/nuvoton/npcm-lpc-bpc.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Nuvoton Low Pin Count (LPC) Bus Controller
+
+maintainers:
+  - Tomer Maimon <tmaimon77@...il.com>
+
+description:
+  The Low Pin Count (LPC) is a low bandwidth bus that is used to connect
+  peripherals around the CPU and to replace the Industry Standard Architecture
+  (ISA) bus.
+
+  The Nuvoton NPCM LPC bus is a bridge of host CPU to a several of peripheral
+  devices.
+
+properties:
+  compatible:
+    items:
+      - enum:
+          - nuvoton,npcm750-lpc
+          - nuvoton,npcm845-lpc
+      - const: simple-mfd
+      - const: syscon
+
+  reg:
+    maxItems: 1
+
+  "#address-cells":
+    const: 1
+
+  "#size-cells":
+    const: 1
+
+  ranges: true
+
+patternProperties:
+  "^lpc_bpc@[0-9a-f]+$":
+    type: object
+    additionalProperties: false
+
+    description:
+      Nuvoton BMC NPCM BIOS Post Code (BPC) monitoring two configurable I/O
+      addresses written by the host on the Low Pin Count (LPC) bus, the capure
+      data stored in 128-word FIFO.
+
+      NPCM BPC supports capture double words, when using capture
+      double word only I/O address 1 is monitored.
+
+    properties:
+      compatible:
+        items:
+          - enum:
+              - nuvoton,npcm750-lpc-bpc
+              - nuvoton,npcm845-lpc-bpc
+
+      reg:
+        maxItems: 1
+
+      interrupts:
+        maxItems: 1
+
+      nuvoton,monitor-ports:
+        $ref: /schemas/types.yaml#/definitions/uint32-array
+        description: 
+          Contain monitor I/O addresses, at least one monitor I/O address 
+          required.
+
+      nuvoton,bpc-en-dwcapture:
+        description: If present, Enable capture double words support.
+        type: boolean
+
+    required:
+      - compatible
+      - reg
+      - interrupts
+      - nuvoton,monitor-ports
+
+required:
+  - compatible
+  - reg
+  - "#address-cells"
+  - "#size-cells"
+  - ranges
+
+additionalProperties:
+  type: object
+
+examples:
+  - |
+    #include <dt-bindings/interrupt-controller/irq.h>
+    #include <dt-bindings/interrupt-controller/arm-gic.h>
+
+    lpc: lpc@...07000 {
+        compatible = "nuvoton,npcm750-lpc", "simple-mfd", "syscon";
+        reg = <0xf0007000 0x1000>;
+
+        #address-cells = <1>;
+        #size-cells = <1>;
+        ranges = <0x0 0xf0007000 0x1000>;
+
+        lpc_snoop: lpc-snoop@40 {
+            compatible = "nuvoton,npcm750-lpc-bpc";
+            reg = <0x40 0x20>;
+            interrupts = <GIC_SPI 9 IRQ_TYPE_LEVEL_HIGH>;
+            nuvoton,monitor-ports = <0x80>;
+        };
+    };
+...
-- 
2.33.0