Yes. You can initially use universal IO to configure the pin(s), and then
when it is time to sleep, use config-pin to change the pins direction, and
/ of value. There is also the /sys/class/gpio/* sysfs set of sub
directories, but I'm unsure how one would use /sys/class/gpio/export, etc
if the pin it already configured via a deice tree file. Perhaps the device
tree file could take care of the mux mode only, and the sysfs gpio sub
system could configure the rest ?
On Tue, May 31, 2016 at 10:33 AM, E Mag <e_...@live.ca> wrote:
> Hi,
>
> Is there a way to set the GPIO pins into a specific state before entering
> sleep mode on the BBB? I know you can set their configuration in the device
> tree e.g.:
>
> wlan_pins_sleep: pinmux_wlan_pins_sleep {
> pinctrl-single,pins = <
> 0x28 (PIN_OUTPUT_PULLUP | MUX_MODE7) /*
> gpmc_ad10.gpio0_26 WL_EN*/
> 0x2C (PIN_INPUT_PULLUP | MUX_MODE7) /*
> gpmc_ad11.gpio0_27 WL_IRQ*/
> 0x7C (PIN_OUTPUT_PULLDOWN | MUX_MODE0) /*
> gpmc_csn0.gpio1_29 BF_EN*/
> >;
> };
>
> But is there a way to set a default output state for certain pins upon
> entering sleep mode without involving the PRU?
>
> Thank you,
>
> -Eric
>
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