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Drivers allwinner h33/14/2023 Note: from the Linux kernel maintainer perspective all unused in-circuit type interfaces that use GPIO pins should be disabled by default and all pins on pin headers or soldering pads will be configured as standard GPIOs. In order to provide the kernel and kernel drivers with details about external devices or to activate interfaces disabled by default. While Device Tree is a way of describing hardware configuration to the kernel, Device Tree overlays are a way for modifying the DT So Linux kernel has to be told explicitly about the device and its configuration details. Most in-circuit and GPIO based interfaces (SPI, I2C, I2S, UART, …) don’t have a mechanism for detecting and identifying devices connected to the bus,
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