i have this overlay file for a simple push button:

​

/ {
    gpio_keys {
        butn: butn {
            gpios = <&gpioa 0 GPIO_ACTIVE_LOW>;
        };
    };

    aliases {
        butn0 = &butn;
    };
};

but when i build i get the following warning and terminate:

[0/1] Re-running CMake...
Including boilerplate (Zephyr base (cached)): /home/ajit/zephyrproject/zephyr/cmake/app/boilerplate.cmake
-- Application: /home/ajit/work/uc/app
-- Zephyr version: 3.0.0-rc1 (/home/ajit/zephyrproject/zephyr), build: v3.0.0-rc1-102-gb374dc6a7fd8
-- Found west (found suitable version "0.12.0", minimum required is "0.7.1")
-- Board: stm32_min_dev_blue
-- Cache files will be written to: /home/ajit/.cache/zephyr
-- Found host-tools: zephyr 0.13.2 (/home/ajit/zephyr-sdk-0.13.2)
-- Found dtc: /home/ajit/zephyr-sdk-0.13.2/sysroots/x86_64-pokysdk-linux/usr/bin/dtc (found suitable version "1.6.0", minimum required is "1.4.6")
-- Found toolchain: zephyr 0.13.2 (/home/ajit/zephyr-sdk-0.13.2)
-- Found BOARD.dts: /home/ajit/zephyrproject/zephyr/boards/arm/stm32_min_dev/stm32_min_dev_blue.dts
-- Found devicetree overlay: /home/ajit/work/uc/app/boards/stm32_min_dev_blue.overlay
-- Generated zephyr.dts: /home/ajit/work/uc/app/build/zephyr/zephyr.dts
-- Generated devicetree_unfixed.h: /home/ajit/work/uc/app/build/zephyr/include/generated/devicetree_unfixed.h
-- Generated device_extern.h: /home/ajit/work/uc/app/build/zephyr/include/generated/device_extern.h
-- Including generated dts.cmake file: /home/ajit/work/uc/app/build/zephyr/dts.cmake

/home/ajit/work/uc/app/boards/stm32_min_dev_blue.overlay:1: warning: ignoring malformed line '/*'

/home/ajit/work/uc/app/boards/stm32_min_dev_blue.overlay:2: warning: ignoring malformed line ' * Copyright (c) 2021 Nordic Semiconductor ASA'

/home/ajit/work/uc/app/boards/stm32_min_dev_blue.overlay:3: warning: ignoring malformed line ' * SPDX-License-Identifier: Apache-2.0'

/home/ajit/work/uc/app/boards/stm32_min_dev_blue.overlay:4: warning: ignoring malformed line ' */'

/home/ajit/work/uc/app/boards/stm32_min_dev_blue.overlay:6: warning: ignoring malformed line '/* This devicetree overlay file will be automatically picked by the Zephyr'

/home/ajit/work/uc/app/boards/stm32_min_dev_blue.overlay:7: warning: ignoring malformed line ' * build system when building the sample for the nucleo_f302r8 board. It shows'

/home/ajit/work/uc/app/boards/stm32_min_dev_blue.overlay:8: warning: ignoring malformed line ' * how the example-application can be built on sample boards already provided'

/home/ajit/work/uc/app/boards/stm32_min_dev_blue.overlay:9: warning: ignoring malformed line ' * by Zephyr.'

/home/ajit/work/uc/app/boards/stm32_min_dev_blue.overlay:10: warning: ignoring malformed line ' */'

/home/ajit/work/uc/app/boards/stm32_min_dev_blue.overlay:12: warning: ignoring malformed line '/ {'

/home/ajit/work/uc/app/boards/stm32_min_dev_blue.overlay:13: warning: ignoring malformed line ' examplesensor0: examplesensor_0 {'

/home/ajit/work/uc/app/boards/stm32_min_dev_blue.overlay:14: warning: ignoring malformed line '     compatible = "zephyr,examplesensor";'

/home/ajit/work/uc/app/boards/stm32_min_dev_blue.overlay:15: warning: ignoring malformed line '     label = "EXAMPLESENSOR_0";'

/home/ajit/work/uc/app/boards/stm32_min_dev_blue.overlay:16: warning: ignoring malformed line '     input-gpios = <&gpioc 13 (GPIO_PULL_UP | GPIO_ACTIVE_LOW)>;'

/home/ajit/work/uc/app/boards/stm32_min_dev_blue.overlay:17: warning: ignoring malformed line ' };'

/home/ajit/work/uc/app/boards/stm32_min_dev_blue.overlay:18: warning: ignoring malformed line '};'

/home/ajit/work/uc/app/boards/stm32_min_dev_blue.overlay:20: warning: ignoring malformed line '&gpioc {'

/home/ajit/work/uc/app/boards/stm32_min_dev_blue.overlay:21: warning: ignoring malformed line ' status = "okay";'

/home/ajit/work/uc/app/boards/stm32_min_dev_blue.overlay:22: warning: ignoring malformed line '};'
Parsing /home/ajit/zephyrproject/zephyr/Kconfig
Loaded configuration '/home/ajit/zephyrproject/zephyr/boards/arm/stm32_min_dev/stm32_min_dev_blue_defconfig'
Merged configuration '/home/ajit/work/uc/app/prj.conf'
Merged configuration '/home/ajit/work/uc/app/boards/stm32_min_dev_blue.overlay'

error: Aborting due to Kconfig warnings

i also just raw copied and pasted the zephyr provided example application to see the same result!

​

what is going wrong?