Re: [PATCH v2 01/13] dt-bindings: i3c: Add mipi-i3c-static-method to support SETAASA

Akhil R
2026-04-10T04:31:13Z

On Thu, 9 Apr 2026 22:00:39 -0400, Frank Li wrote:
> On Thu, Apr 09, 2026 at 04:27:31PM +0530, Akhil R wrote:
>> Add the 'mipi-i3c-static-method' property mentioned in the MIPI I3C
>> Discovery and Configuration Specification [1] to specify which discovery
>> method an I3C device supports during bus initialization. The property is
>> a bitmap, where a bit value of 1 indicates support for that method, and 0
>> indicates lack of support.
>> Bit 0: SETDASA CCC (Direct)
>> Bit 1: SETAASA CCC (Broadcast)
>> Bit 2: Other CCC (vendor / standards extension)
>> All other bits are reserved.
>>
>> It is specifically needed when an I3C device requires SETAASA for the
>> address assignment. SETDASA will be supported by default if this property
>> is absent, which means for now the property just serves as a flag to
>> enable SETAASA, but keep the property as a bitmap to align with the
>> specifications.
>>
>> [1] https://www.mipi.org/mipi-disco-for-i3c-download
>>
>> Signed-off-by: Akhil R <akhilrajeev@nvidia.com>
>> ---
>> .../devicetree/bindings/i3c/i3c.yaml | 30 ++++++++++++++++---
>> 1 file changed, 26 insertions(+), 4 deletions(-)
>>
>> diff --git a/Documentation/devicetree/bindings/i3c/i3c.yaml b/Documentation/devicetree/bindings/i3c/i3c.yaml
>> index e25fa72fd785..1705d90d4d79 100644
>> --- a/Documentation/devicetree/bindings/i3c/i3c.yaml
>> +++ b/Documentation/devicetree/bindings/i3c/i3c.yaml
>> @@ -31,10 +31,12 @@ properties:
>> described in the device tree, which in turn means we have to describe
>> I3C devices.
>>
>> - Another use case for describing an I3C device in the device tree is when
>> - this I3C device has a static I2C address and we want to assign it a
>> - specific I3C dynamic address before the DAA takes place (so that other
>> - devices on the bus can't take this dynamic address).
>> + Other use-cases for describing an I3C device in the device tree are:
>> + - When the I3C device has a static I2C address and we want to assign
>> + it a specific I3C dynamic address before the DAA takes place (so
>> + that other devices on the bus can't take this dynamic address).
>> + - When the I3C device requires SETAASA for its discovery and uses a
>> + pre-defined static address.
>>
>> "#size-cells":
>> const: 0
>> @@ -147,6 +149,26 @@ patternProperties:
>> through SETDASA. If static address is not present, this address is assigned
>> through SETNEWDA after assigning a temporary address via ENTDAA.
>>
>> + mipi-i3c-static-method:
>> + $ref: /schemas/types.yaml#/definitions/uint32
>> + minimum: 0x1
>> + maximum: 0xff
>> + default: 1
>> + description: |
>> + Bitmap describing which methods of Dynamic Address Assignment from a
>> + static address are supported by this I3C Target. A bit value of 1
>> + indicates support for that method, and 0 indicates lack of support.
>> + Bit 0: SETDASA CCC (Direct)
>> + Bit 1: SETAASA CCC (Broadcast)
>> + Bit 2: Other CCC (vendor / standards extension)
>
> You need define at include/dt-bindings/i3c/i3c.h

Ack. Will add these as macros.

>
> Or direct use string arrray
> anyOf
> - setdasa
> - setaasa
> - vendor

The below thread suggested to keep bitmap since this property comes from
a MIPI specification.
https://lore.kernel.org/linux-i3c/20260318172820.13771-1-akhilrajeev@nvidia.com/T/#m8a6c56cff2bde07b84ebfb403a6ac152da24982e

Best Regards,
Akhil