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[v3,02/13] ACPICA: Read LVR from the I2C resource descriptor

Message ID 20260423085718.70762-3-akhilrajeev@nvidia.com
State Handled Elsewhere
Headers show
Series Support ACPI and SETAASA device discovery | expand

Commit Message

Akhil R April 23, 2026, 8:57 a.m. UTC 
ACPI 6.3 specifies byte 8 of I2C Serial Bus Connection descriptor to be
used for Legacy Virtual Register (LVR) data as specified in the MIPI
I3C Specification for an I2C device connected to an I3C Host Controller.
LVR will be read by I3C host controller drivers and it provides details
about the specific speed and 50ns spike filter capabilities of I2C
devices.

Update the rsconvert_info to include this field. For I2C devices on an
I2C bus, this field is Reserved and unused.

Link: https://github.com/acpica/acpica/commit/70082dc8
Link: https://github.com/acpica/acpica/commit/b3c38dc9
Acked-by: Rafael J. Wysocki (Intel) <rafael@kernel.org> # ACPI
Signed-off-by: Akhil R <akhilrajeev@nvidia.com>
---
 drivers/acpi/acpica/rsserial.c | 6 +++++-
 include/acpi/acrestyp.h        | 1 +
 2 files changed, 6 insertions(+), 1 deletion(-)
diff mbox series

Patch

diff --git a/drivers/acpi/acpica/rsserial.c b/drivers/acpi/acpica/rsserial.c
index 279bfa27da94..c06e918ab889 100644
--- a/drivers/acpi/acpica/rsserial.c
+++ b/drivers/acpi/acpica/rsserial.c
@@ -315,7 +315,7 @@  struct acpi_rsconvert_info acpi_rs_convert_csi2_serial_bus[14] = {
  *
  ******************************************************************************/
 
-struct acpi_rsconvert_info acpi_rs_convert_i2c_serial_bus[17] = {
+struct acpi_rsconvert_info acpi_rs_convert_i2c_serial_bus[18] = {
 	{ACPI_RSC_INITGET, ACPI_RESOURCE_TYPE_SERIAL_BUS,
 	 ACPI_RS_SIZE(struct acpi_resource_i2c_serialbus),
 	 ACPI_RSC_TABLE_SIZE(acpi_rs_convert_i2c_serial_bus)},
@@ -391,6 +391,10 @@  struct acpi_rsconvert_info acpi_rs_convert_i2c_serial_bus[17] = {
 	 AML_OFFSET(i2c_serial_bus.type_specific_flags),
 	 0},
 
+	{ACPI_RSC_MOVE8, ACPI_RS_OFFSET(data.i2c_serial_bus.lvr),
+	 AML_OFFSET(i2c_serial_bus.type_specific_flags) + 1,
+	 1},
+
 	{ACPI_RSC_MOVE32, ACPI_RS_OFFSET(data.i2c_serial_bus.connection_speed),
 	 AML_OFFSET(i2c_serial_bus.connection_speed),
 	 1},
diff --git a/include/acpi/acrestyp.h b/include/acpi/acrestyp.h
index 842f932e2c2b..38a19b1d19ac 100644
--- a/include/acpi/acrestyp.h
+++ b/include/acpi/acrestyp.h
@@ -423,6 +423,7 @@  struct acpi_resource_i2c_serialbus {
 	ACPI_RESOURCE_SERIAL_COMMON u8 access_mode;
 	u16 slave_address;
 	u32 connection_speed;
+	u8 lvr;
 };
 
 /* Values for access_mode field above */