Hi,
On Friday 09 February 2018 09:49 PM, Tony Lindgren wrote:
> We can use CTRL_CONF_UART0_RXD pad as the wakeirq and then
> the serial console will work with wake up events.
>
> Note that the uart still needs to be configured for idle
> timeouts for PM runtime for the wakeirq to get activated.
> That can be done via sysfs to set autosuspend_delay_ms to
> 3000, wakeup enabled and and control auto.
>
> Cc: Dave Gerlach <d-gerlach@xxxxxx>
> Signed-off-by: Tony Lindgren <tony@xxxxxxxxxxx>
> ---
> arch/arm/boot/dts/am437x-idk-evm.dts | 6 ++++++
> 1 file changed, 6 insertions(+)
>
> diff --git a/arch/arm/boot/dts/am437x-idk-evm.dts
> b/arch/arm/boot/dts/am437x-idk-evm.dts
> --- a/arch/arm/boot/dts/am437x-idk-evm.dts
> +++ b/arch/arm/boot/dts/am437x-idk-evm.dts
> @@ -533,3 +533,9 @@
> opp-suspend;
> };
> };
> +
> +&uart0 {
> + /* UART0 interrupt and CTRL_CONF_UART0_RXD pad as wakeirq */
> + interrupts-extended = <&gic GIC_SPI 72 IRQ_TYPE_LEVEL_HIGH>,
> + <&am43xx_pinmux 0x170>;
> +};
As per Section 6.4.5 Wakeup Sources/Events AM437x TRM, UART0 is in
Wakeup Power domain and can wakeup the system directly. AFAIK, there is
no need to use CTRL_CONF_UART0_RXD pad as the wakeirq.
--
Regards
Vignesh
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