doc: boards: extensions: add Sphinx directive for board supported hardware

Introduce a new directive for displaying hardware features supported by
a board, using information available in the devicetree.

Signed-off-by: Benjamin Cabé <[email protected]>

Author: kartben

doc/_extensions/zephyr/domain/__init__.py

@@ -53,6 +53,8 @@
 from zephyr.doxybridge import DoxygenGroupDirective
 from zephyr.gh_utils import gh_link_get_url
 
+from .binding_types import BINDING_TYPES
+
 __version__ = "0.2.0"
 
 
@@ -67,6 +69,16 @@
 
 logger = logging.getLogger(__name__)
 
+BINDING_TYPE_TO_DOCUTILS_NODE = {}
+for key, value in BINDING_TYPES.items():
+    if isinstance(value, tuple):
+        # For abbreviations with explanations
+        abbr, explanation = value
+        BINDING_TYPE_TO_DOCUTILS_NODE[key] = nodes.abbreviation(abbr, abbr, explanation=explanation)
+    else:
+        # For simple text
+        BINDING_TYPE_TO_DOCUTILS_NODE[key] = nodes.Text(value)
+
 
 class CodeSampleNode(nodes.Element):
     pass
@@ -685,6 +697,7 @@ def run(self):
             board_node = BoardNode(id=board_name)
             board_node["full_name"] = board["full_name"]
             board_node["vendor"] = vendors.get(board["vendor"], board["vendor"])
+            board_node["supported_features"] = board["supported_features"]
             board_node["archs"] = board["archs"]
             board_node["socs"] = board["socs"]
             board_node["image"] = board["image"]
@@ -716,6 +729,137 @@ def run(self):
             return [nodes.paragraph(text="Board catalog is only available in HTML.")]
 
 
+class BoardSupportedHardwareDirective(SphinxDirective):
+    """A directive for showing the supported hardware features of a board."""
+
+    has_content = False
+    required_arguments = 0
+    optional_arguments = 0
+
+    def run(self):
+        env = self.env
+        docname = env.docname
+
+        matcher = NodeMatcher(BoardNode)
+        board_nodes = list(self.state.document.traverse(matcher))
+        if not board_nodes:
+            logger.warning(
+                "board-supported-hw directive must be used in a board documentation page.",
+                location=(docname, self.lineno),
+            )
+            return []
+
+        board_node = board_nodes[0]
+        supported_features = board_node["supported_features"]
+        result_nodes = []
+
+        paragraph = nodes.paragraph()
+        paragraph += nodes.Text("The ")
+        paragraph += nodes.literal(text=board_node["id"])
+        paragraph += nodes.Text(" board supports the hardware features listed below.")
+        result_nodes.append(paragraph)
+
+        if not env.app.config.zephyr_generate_hw_features:
+            note = nodes.admonition()
+            note += nodes.title(text="Note")
+            note["classes"].append("warning")
+            note += nodes.paragraph(
+                text="The list of supported hardware features was not generated. Run a full "
+                "documentation build for the required metadata to be available."
+            )
+            result_nodes.append(note)
+            return result_nodes
+
+        # Add the note before any tables
+        note = nodes.admonition()
+        note += nodes.title(text="Note")
+        note["classes"].append("note")
+        note += nodes.paragraph(
+            text="The tables below were automatically generated using information from the "
+            "Devicetree. They may not be fully representative of all the hardware features "
+            "supported by the board."
+        )
+        result_nodes.append(note)
+
+        for target, features in sorted(supported_features.items()):
+            if not features:
+                continue
+
+            target_heading = nodes.section(ids=[f"{board_node['id']}-{target}-hw-features"])
+            heading = nodes.title()
+            heading += nodes.literal(text=target)
+            heading += nodes.Text(" target")
+            target_heading += heading
+            result_nodes.append(target_heading)
+
+            table = nodes.table(classes=["colwidths-given"])
+            tgroup = nodes.tgroup(cols=3)
+
+            tgroup += nodes.colspec(colwidth=20, classes=["col-1"])
+            tgroup += nodes.colspec(colwidth=50)
+            tgroup += nodes.colspec(colwidth=30)
+
+            thead = nodes.thead()
+            row = nodes.row()
+            headers = ["Type", "Description", "Compatible"]
+            for header in headers:
+                row += nodes.entry("", nodes.paragraph(text=header))
+            thead += row
+            tgroup += thead
+
+            tbody = nodes.tbody()
+
+            def feature_sort_key(feature):
+                # Put "CPU" first. Later updates might also give priority to features
+                # like "sensor"s, for example.
+                if feature == "cpu":
+                    return (0, feature)
+                return (1, feature)
+
+            sorted_features = sorted(features.keys(), key=feature_sort_key)
+
+            for feature in sorted_features:
+                items = list(features[feature].items())
+                num_items = len(items)
+
+                for i, (key, value) in enumerate(items):
+                    row = nodes.row()
+
+                    # Add type column only for first row of a feature
+                    if i == 0:
+                        type_entry = nodes.entry(morerows=num_items - 1)
+                        type_entry += nodes.paragraph(
+                            "",
+                            "",
+                            BINDING_TYPE_TO_DOCUTILS_NODE.get(
+                                feature, nodes.Text(feature)
+                            ).deepcopy(),
+                        )
+                        row += type_entry
+
+                    row += nodes.entry("", nodes.paragraph(text=value))
+
+                    # Create compatible xref
+                    xref = addnodes.pending_xref(
+                        "",
+                        refdomain="std",
+                        reftype="dtcompatible",
+                        reftarget=key,
+                        refexplicit=False,
+                        refwarn=True,
+                    )
+                    xref += nodes.literal(text=key)
+                    row += nodes.entry("", nodes.paragraph("", "", xref))
+
+                    tbody += row
+
+            tgroup += tbody
+            table += tgroup
+            result_nodes.append(table)
+
+        return result_nodes
+
+
 class ZephyrDomain(Domain):
     """Zephyr domain"""
 
@@ -734,6 +878,7 @@ class ZephyrDomain(Domain):
         "code-sample-category": CodeSampleCategoryDirective,
         "board-catalog": BoardCatalogDirective,
         "board": BoardDirective,
+        "board-supported-hw": BoardSupportedHardwareDirective,
     }
 
     object_types: dict[str, ObjType] = {

doc/_extensions/zephyr/domain/binding_types.py

@@ -0,0 +1,135 @@
+"""
+SPDX-FileCopyrightText: Copyright (c) 2025 The Linux Foundation
+SPDX-License-Identifier: Apache-2.0
+
+This module contains the mapping of binding types to their human-readable names and descriptions.
+Each entry can be either:
+- A string representing the human-readable name
+- A tuple of (abbreviation, full name) for cases where an abbreviation exists
+"""
+
+BINDING_TYPES = {
+    # zephyr-keep-sorted-start re(^    ")
+    "acpi": ("ACPI", "Advanced Configuration and Power Interface"),
+    "adc": ("ADC", "Analog to Digital Converter"),
+    "alh": ("ALH", "Audio Link Hub"),
+    "arc": "ARC architecture",
+    "arm": "ARM architecture",
+    "audio": "Audio",
+    "auxdisplay": "Auxiliary Display",
+    "base": "Base",
+    "battery": "Battery",
+    "bluetooth": "Bluetooth",
+    "cache": "Cache",
+    "can": ("CAN", "Controller Area Network"),
+    "charger": "Charger",
+    "clock": "Clock control",
+    "coredump": "Core dump",
+    "counter": "Counter",
+    "cpu": "CPU",
+    "crypto": "Cryptographic accelerator",
+    "dac": ("DAC", "Digital to Analog Converter"),
+    "dai": ("DAI", "Digital Audio Interface"),
+    "debug": "Debug",
+    "dfpmcch": "DFPMCCH",
+    "dfpmccu": "DFPMCCU",
+    "disk": "Disk",
+    "display": "Display",
+    "display/panel": "Display panel",
+    "dma": ("DMA", "Direct Memory Access"),
+    "dsa": ("DSA", "Distributed Switch Architecture"),
+    "edac": ("EDAC", "Error Detection and Correction"),
+    "espi": ("eSPI", "Enhanced Serial Peripheral Interface"),
+    "ethernet": "Ethernet",
+    "firmware": "Firmware",
+    "flash_controller": "Flash controller",
+    "fpga": ("FPGA", "Field Programmable Gate Array"),
+    "fs": "File system",
+    "fuel-gauge": "Fuel gauge",
+    "gnss": ("GNSS", "Global Navigation Satellite System"),
+    "gpio": ("GPIO", "General Purpose Input/Output"),
+    "haptics": "Haptics",
+    "hda": ("HDA", "High Definition Audio"),
+    "hdlc_rcp_if": "IEEE 802.15.4 HDLC RCP interface",
+    "hwinfo": "Hardware information",
+    "hwspinlock": "Hardware spinlock",
+    "i2c": ("I2C", "Inter-Integrated Circuit"),
+    "i2s": ("I2S", "Inter-IC Sound"),
+    "i3c": ("I3C", "Improved Inter-Integrated Circuit"),
+    "ieee802154": "IEEE 802.15.4",
+    "iio": ("IIO", "Industrial I/O"),
+    "input": "Input",
+    "interrupt-controller": "Interrupt controller",
+    "ipc": ("IPC", "Inter-Processor Communication"),
+    "ipm": ("IPM", "Inter-Processor Mailbox"),
+    "kscan": "Keyscan",
+    "led": ("LED", "Light Emitting Diode"),
+    "led_strip": ("LED", "Light Emitting Diode"),
+    "lora": "LoRa",
+    "mbox": "Mailbox",
+    "mdio": ("MDIO", "Management Data Input/Output"),
+    "memory-controllers": "Memory controller",
+    "memory-window": "Memory window",
+    "mfd": ("MFD", "Multi-Function Device"),
+    "mhu": ("MHU", "Mailbox Handling Unit"),
+    "net": "Networking",
+    "mipi-dbi": ("MIPI DBI", "Mobile Industry Processor Interface Display Bus Interface"),
+    "mipi-dsi": ("MIPI DSI", "Mobile Industry Processor Interface Display Serial Interface"),
+    "misc": "Miscellaneous",
+    "mm": "Memory management",
+    "mmc": ("MMC", "MultiMediaCard"),
+    "mmu_mpu": ("MMU / MPU", "Memory Management Unit / Memory Protection Unit"),
+    "modem": "Modem",
+    "mspi": "Multi-bit SPI",
+    "mtd": ("MTD", "Memory Technology Device"),
+    "wireless": "Wireless network",
+    "options": "Options",
+    "ospi": "Octal SPI",
+    "pcie": ("PCIe", "Peripheral Component Interconnect Express"),
+    "peci": ("PECI", "Platform Environment Control Interface"),
+    "phy": "PHY",
+    "pinctrl": "Pin control",
+    "pm_cpu_ops": "Power management CPU operations",
+    "power": "Power management",
+    "power-domain": "Power domain",
+    "ppc": "PPC architecture",
+    "ps2": ("PS/2", "Personal System/2"),
+    "pwm": ("PWM", "Pulse Width Modulation"),
+    "qspi": "Quad SPI",
+    "regulator": "Regulator",
+    "reserved-memory": "Reserved memory",
+    "reset": "Reset controller",
+    "retained_mem": "Retained memory",
+    "retention": "Retention",
+    "riscv": "RISC-V architecture",
+    "rng": ("RNG", "Random Number Generator"),
+    "rtc": ("RTC", "Real Time Clock"),
+    "sd": "SD",
+    "sdhc": "SDHC",
+    "sensor": "Sensors",
+    "serial": "Serial controller",
+    "shi": ("SHI", "Secure Hardware Interface"),
+    "sip_svc": ("SIP", "Service in Platform"),
+    "smbus": ("SMBus", "System Management Bus"),
+    "sound": "Sound",
+    "spi": ("SPI", "Serial Peripheral Interface"),
+    "sram": "SRAM",
+    "stepper": "Stepper",
+    "syscon": "System controller",
+    "tach": "Tachometer",
+    "tcpc": ("TCPC", "USB Type-C Port Controller"),
+    "test": "Test",
+    "timer": "Timer",
+    "timestamp": "Timestamp",
+    "usb": "USB",
+    "usb-c": "USB Type-C",
+    "uac2": "USB Audio Class 2",
+    "video": "Video",
+    "virtualization": "Virtualization",
+    "w1": "1-Wire",
+    "watchdog": "Watchdog",
+    "wifi": "Wi-Fi",
+    "xen": "Xen",
+    "xspi": ("XSPI", "Expanded Serial Peripheral Interface"),
+    # zephyr-keep-sorted-stop
+}

doc/_extensions/zephyr/domain/templates/board-card.html

@@ -15,7 +15,17 @@
   data-arch="{{ board.archs | join(" ") }}"
   data-vendor="{{ board.vendor }}"
   data-socs="{{ board.socs | join(" ") }}"
-  data-supported-features="{{ board.supported_features | join(" ") }}" tabindex="0">
+  data-supported-features="
+    {%- set feature_types = [] -%}
+    {%- for target_features in board.supported_features.values() -%}
+      {%- for feature_type in target_features.keys() -%}
+        {%- if feature_type not in feature_types -%}
+          {%- set _ = feature_types.append(feature_type) -%}
+        {%- endif -%}
+      {%- endfor -%}
+    {%- endfor -%}
+    {{- feature_types|join(' ') -}}
+  " tabindex="0">
   <div class="vendor">{{ vendors[board.vendor] }}</div>
   {% if board.image -%}
   <img alt="A picture of the {{ board.full_name }} board"