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Qualcomm peripherals like UART, SPI, I2C, etc are all exposed under a common GENI Serial Engine wrapper device. Replace the stub driver we use for this currently with a full-on misc device and implement support for loading peripheral firmware. Each of the peripherals has it's own protocol-specific firmware, this is stored on the internal storage of the device with a well-known partition type GUID. To support this, GENI will bind peripherals in two stages. First the ones that already have firmware loaded (such as the serial port) are bound in the typical way. But devices that require firmware loading are deferred until EVT_LAST_STAGE_INIT. At this point we can be sure that the storage device is available, so we load the firmware and then bind and probe the remaining children. Child devices are expected to determine if firmware loading is necessary and call qcom_geni_load_firmware(). Since Linux currently doesn't support loading firmware (and firmware may not be available), we probe all GENI peripherals to ensure that they always load firmware if necessary. Signed-off-by: Casey Connolly <casey.connolly@linaro.org> Link: https://patch.msgid.link/20250714-geni-load-fw-v5-3-5abbc0d29838@linaro.org Signed-off-by: Casey Connolly <kcxt@postmarketos.org>