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.
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