Quoting Akash Asthana (2019-11-21 22:46:32) > > On 11/16/2019 1:11 AM, Stephen Boyd wrote: > > Quoting Akash Asthana (2019-11-15 02:00:44) > >> On 11/14/2019 11:10 PM, Stephen Boyd wrote: > >>> Quoting Akash Asthana (2019-11-13 02:48:56) > >>>> Add system wakeup capability over UART RX line for wakeup capable UART. > >>>> When system is suspended, RX line act as an interrupt to wakeup system > >>>> for any communication requests from peer. > >>> How does the RX line get remuxed as a GPIO interrupt here? Is that > >>> through some pinctrl magic in DT or just via enabling/disabling the > >>> interrupt? > >> Yes, For wakeup capable UART node, we have registered UART RX line with > >> TLMM interrupt controller in DT file . Example: if GPIO48 is UART RX line > >> > >> interrupts-extended = <&intc GIC_SPI 607 IRQ_TYPE_LEVEL_HIGH>, <&tlmm > >> 48 IRQ_TYPE_EDGE_FALLING>; > > Right. So is gpio48 muxed as 'uart' function forever and the interrupt > > logic in tlmm is connected to that pad regardless of the function > > selected? I thought that gpios through TLMM had to be muxed as function > > 0, i.e. gpio function, so that interrupts worked. But maybe that's wrong > > and it can work without that. > > Yes, gpio48 is muxed as "uart' function function forever. There is no > need to mux gpio48 to > > gpio function, interrupts can work without that. > Ok thanks for confirming.
