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charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-i3c" Errors-To: linux-i3c-bounces+linux-i3c=archiver.kernel.org@lists.infradead.org On Thu, 19 Mar 2026 10:29:38 -0400, Frank Li wrote: > On Wed, Mar 18, 2026 at 10:57:17PM +0530, Akhil R wrote: >> Support ACPI enumeration for I2C and I3C devices on an I3C bus. >> Read _ADR and LVR from the ACPI resources and extract the data > > ADR have _, but not _ before LVR, I am not familary with ACPI. '_ADR' is a static ACPI object (or method), but LVR is not. LVR (Legacy Virtual Register) has to be read by parsing the ACPI I2C serial resource. > >> as per the ACPI specification for an I3C bus. Also read >> mipi-i3c-static-address as per the MIPI DISCO specifications [1] >> to get the static address to be used. >> >> Although the existing subsystem allows host controllers to register >> through the ACPI table, it was not possible to describe I3C or I2C >> devices there. > > why? The existing code relied on the 'reg' property to get PID, static address etc. ACPI table entries do not use reg property, instead use _ADR or other resource objects. Also for ACPI, MIPI recommends a different format which encodes the details in the _ADR object. The specification also includes a few additional properties like mipi-i3c-static-address, mipi-i3c-static-method etc. which the new code follows. > >> This change enables describing the I3C or I2C devices > > Don't use "This commit/change/" just Enable ... Ack. Will update. Best Regards, Akhil -- linux-i3c mailing list linux-i3c@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-i3c