[WP77][R14.1][19.11.5] How to use UART1_DTR to wakeup from Sleep State and register interrupt on this gpio

[jyijyi]

I mean you set these first to see if DTR pin can wake up the wp77 module

At!mapuart=1,1
At+ksleep=0

BTW, here shows how to change DTR to GPIO in yocto source of WP76 in R13, you can see if you can do the same in WP77:

Controlling DCD, DTR, DSR lines by legato application

I don’t see there is such implementation on the coming release on WP76. However, I check the code (yocto/kernel/driver/gpio/gpiolib.c) of yocto of WP8548. I guess it is not difficult to implement. In WP76 yocto source code (yocto/kernel/driver/gpio/gpiolib-sysfs.c) , you can add some new GPIO in ext_gpio_map ext_gpio_wp: {“101”,xx,FUNCTION_EMBEDDED_HOST}, {“102”,xx,FUNCTION_EMBEDDED_HOST}, {“103”,xx,FUNCTION_EMBEDDED_HOST}, And map those xx number to the MDM CHIP UART DCD/DTR/DSR. After …

As the implementation of yocto linux gpio part in WP76 FW R16.0.1 and R13 is different, I have also tried the following in the yocto linux of WP76 R16.0.1, I can control the UART1 DTR pin as other gpio through sysfs. You might try the same in WP77 R14.1 yocto source:

1. open yocto/kernel/arch/arm/boot/dts/qcom/mdm9607-wp76xx.dtsi
2. around line 367, add the following line for UART1 DTR:

		alias-42 = <&tlmm_pinmux 79 0>;
		alias-RI = <&tlmm_pinmux 25 0>;
		/* WIFI aliases */
		alias-WLAN_EN = <&tlmm_pinmux 58 0>;
		alias-WIFI_IRQ = <&tlmm_pinmux 79 0>;
		alias-UART1_DTR = <&tlmm_pinmux 17 0>;

3. type make to build the yocto.cwe
4. download to the module with FW 16
5. I can control the UART1 DTR pin by the following commands:

echo UART1_DTR > /sys/class/gpio/v2/alias_export
echo out > /sys/class/gpio/v2/aliases_exported/UART1_DTR/direction
echo 1 > /sys/class/gpio/v2/aliases_exported/UART1_DTR/value

echo 0 > /sys/class/gpio/v2/aliases_exported/UART1_DTR/value

If it works, then you can see here to make this DTR (GPIO pin 17) as wake up pin in kernel driver.

Accessing driver functions under linux kernel modules for BMI160