There is autosar specs for I2C here:
https://www.autosar.org/fileadmin/standards/R24-11/CP/AUTOSAR_CP_SWS_I2CDriver.pdf
No autosar specs for UART but you can still refer CDD(Complex Device Driver) UART specs from TI(Texas Instruments):
https://software-dl.ti.com/mcu-plus-sdk/esd/PLATFORM_SW_MCAL/AM263P/09.02.00/modules/cdd_uart.html