On Mon, Apr 20, 2020 at 10:06:38AM +0800, sean.wang@xxxxxxxxxxxx wrote: > From: Sean Wang <sean.wang@xxxxxxxxxxxx> > > Bluetooth Interface (BTIF) is designed dedicatedly for MediaTek SOC with > BT in order to be instead of the UART interface between BT module and Host > CPU, and not exported to user space to access. > > As the UART design, BTIF will be an APB slave and can transmit or receive > data by MCU access, but doesn't provide termios function like baudrate and > flow control setup. > > Even LCR on offset 0xC that is just a FAKELCR > a. If FAKELCR[7] is equaled to 1, RBR(0x00), THR(0x00), IER(0x04) > will not be readable/writable. > > b. If FAKELCR is equaled to 0xBF, RBR(0x00), THR(0x00), IER(0x04), > IIR(0x08), and LSR(0x14) will not be readable/writable. > > So adding a new capability 'UART_CAP_NMOD' for the unusual unsupported > case. ... > +#define UART_CAP_NMOD (1 << 18) /* UART doesn't do termios */ I would rather spell it as NTIO or NO_TIO (as TIO is a well established prefix for termios IOCTLs). -- With Best Regards, Andy Shevchenko
