acpi来模拟dts

通过acpi来模拟dts 的文档在Documentation/firmware-guide/acpi/enumeration.rst 可以看到
acpi来模拟dtd的关键是使用drivers/acpi/internal.h:237:#define ACPI_DT_NAMESPACE_HID       "PRP0001"

static bool __acpi_match_device(struct acpi_device *device,
				const struct acpi_device_id *acpi_ids,
				const struct of_device_id *of_ids,
				const struct acpi_device_id **acpi_id,
				const struct of_device_id **of_id)
{
	const struct acpi_device_id *id;
	struct acpi_hardware_id *hwid;

	/*
	 * If the device is not present, it is unnecessary to load device
	 * driver for it.
	 */
	if (!device || !device->status.present)
		return false;

	list_for_each_entry(hwid, &device->pnp.ids, list) {
		/* First, check the ACPI/PNP IDs provided by the caller. */
		if (acpi_ids) {
			for (id = acpi_ids; id->id[0] || id->cls; id++) {
				if (id->id[0] && !strcmp((char *)id->id, hwid->id))
					goto out_acpi_match;
				if (id->cls && __acpi_match_device_cls(id, hwid))
					goto out_acpi_match;
			}
		}
#可见在acpi match的时候会坚持如果HID是"PRP0001"，就调用acpi_of_match_device 来判断是否匹配，而
acpi_of_match_device 的作用就是 Match device object using the "compatible" property.
		/*
		 * Next, check ACPI_DT_NAMESPACE_HID and try to match the
		 * "compatible" property if found.
		 */
		if (!strcmp(ACPI_DT_NAMESPACE_HID, hwid->id))
			return acpi_of_match_device(device, of_ids, of_id);
	}
	return false;

out_acpi_match:
	if (acpi_id)
		*acpi_id = id;
	return true;
}
这样的话，在acpi系统中使用dts的驱动，只要bios 适配就可以了，bios 适配dts的驱动，举例如下：
 Device (TMP0)
        {
                Name (_HID, "PRP0001")
                Name (_DSD, Package() {
                        ToUUID("daffd814-6eba-4d8c-8a91-bc9bbf4aa301"),
                        Package () {
                                Package (2) { "compatible", "ti,tmp75" },
                        }
                })
                Method (_CRS, 0, Serialized)
                {
                        Name (SBUF, ResourceTemplate ()
                        {
                                I2cSerialBusV2 (0x48, ControllerInitiated,
                                        400000, AddressingMode7Bit,
                                        "\\_SB.PCI0.I2C1", 0x00,
                                        ResourceConsumer, , Exclusive,)
                        })
                        Return (SBUF)
                }
        }