Acpi Prp0001 0 Work -

In technical terms, PRP0001 is a special used to signal that a device should be enumerated using its Device Tree "compatible" property . It acts as a fallback for manufacturers who want to use standard Linux drivers for hardware integrated into an ACPI-based BIOS environment. Common hardware associated with this ID includes: How should I2C drivers be matched in ACPI with HID PRP0001

If you are running Windows on a Valve Steam Deck and see ACPI\PRP0001\0 listed under "Unknown Devices":

For an I2C device, ensure the I2C controller driver is bound:

: Hardware IDs in ACPI must be officially registered (e.g., "INTC1056"). If you are developing custom hardware or porting a driver from an ARM/DT platform, you might not have a registered ID. The Solution : By setting the of a device to , the kernel is instructed to look at the device's (Device-Specific Data) object for a compatible : The Linux ACPI scan handler matches the ID and triggers default enumeration. It then parses the to find the driver's compatible string (e.g., "gpio-leds" ) and binds the driver accordingly. Example Implementation (ASL) To use this feature in an ACPI Source Language (ASL) file, you define the and provide the compatible string within a acpi prp0001 0

In the past, hardware developers had a problem. If they made a simple component (like an I2C temperature sensor), they had to write two different sets of descriptions: one for ACPI and one for Device Tree.

Now let’s break down the actual keyword phrase: acpi prp0001 0 .

Before the I²C subsystem patch (commit e3cb82c ), PRP0001 devices were not enumerated correctly when the driver lacked an explicit ACPI ID table. The commit's description states: In technical terms, PRP0001 is a special used

) Method (_CRS, 0, Serialized)

: The PRP0001 identifier is widely used to enable Industrial I/O (IIO) sensors, which are common in embedded systems. A patch to the mcp4725 DAC driver explicitly notes that it "enables use of ACPI PRP0001". This demonstrates how ACPI systems can leverage IIO drivers originally designed for the Device Tree.

[ 3.102345] ACPI: PRP0001 device [GPIO0] probing... [ 3.115678] Unable to handle kernel NULL pointer dereference at IRQ mapping If you are developing custom hardware or porting

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[ 0.987654] ACPI: PRP0001:00: PRP0001 device

Inside the _DSD packet, it searches for a property named compatible (type string).