# Overview of peripheral interfaces Source: [https://docs.qualcomm.com/doc/80-70023-8/topic/overview-of-wired-interfaces.html](https://docs.qualcomm.com/doc/80-70023-8/topic/overview-of-wired-interfaces.html) The Qualcomm® Linux® interfaces guide describes both the low-speed and high-speed input/output (I/O) peripheral interface subsystems used in the System-on-Chip (SoC). - The low-speed I/O interfaces operate at a lower frequency than the high-speed interfaces in the SoC. The Qualcomm universal peripheral (QUP) v3 serial engine is a hardware core that supports the following low-speed peripheral interfaces: - Universal asynchronous receiver/transmitter ([UART](https://docs.qualcomm.com/doc/80-70023-8/topic/uart.html)) - Serial peripheral interface ([SPI](https://docs.qualcomm.com/doc/80-70023-8/topic/spi.html)) - Interintegrated circuit ([I2C](https://docs.qualcomm.com/doc/80-70023-8/topic/i2c.html)) - Improved interintegrated circuit ([I3C](https://docs.qualcomm.com/doc/80-70023-8/topic/i3c.html)) These low-speed interfaces communicate with low-speed peripherals, such as sensor interface devices, Bluetooth® wireless technology devices, display or touch interface devices. - The high-speed I/O interfaces include the following peripheral interfaces: - Peripheral component interconnect express ([PCIe](https://docs.qualcomm.com/doc/80-70023-8/topic/pcie.html)) - Universal serial bus ([USB](https://docs.qualcomm.com/doc/80-70023-8/topic/usb.html)) The high-speed I/O interfaces are used to connect to high-speed devices, such as solid-state drives, network cards, external graphics cards. ## Peripheral interfaces software stack The following figure shows the software stack for peripheral interfaces. Figure : Peripheral interfaces software stack ## QUP v3 Qualcomm uses QUP v3, a highly flexible and programmable hardware to support a wide range of serial interfaces. For more information about QUP v3, see the following resources: - [QUP v3 overview](https://docs.qualcomm.com/doc/80-70023-8/topic/references.html#introduction-to-qup-v3) - [Supported transfer modes in QUP v3](https://docs.qualcomm.com/doc/80-70023-8/topic/references.html#qup-v3-supported-transfer-modes) - [QUP v3 access control customization](https://docs.qualcomm.com/doc/80-70023-8/topic/references.html#customize-access-control-of-qup) - [QUP v3 firmware status verification](https://docs.qualcomm.com/doc/80-70023-8/topic/references.html#verify-qup-firmware-status) Note: - The source code for boot and aDSP subsystems is available to licensed developers with authorized access. - See [Hardware SoCs](https://docs.qualcomm.com/bundle/publicresource/topics/80-70023-115/soc.html) that are supported on Qualcomm Linux. This guide is your primary resource for information about enabling low-speed and high-speed I/O interfaces and making configuration changes. Note: Across this guide, `` refers to QCS6490, QCS5430, Qualcomm Dragonwing™ IQ-9075, Qualcomm Dragonwing™ IQ-8275, or Qualcomm Dragonwing™ IQ-615. For example, for arch/arm64/boot/dts/qcom/<chipset>.dts, the corresponding device tree source (DTS) file is at [https://github.com/torvalds/linux/blob/master/arch/arm64/boot/dts/qcom/qcs6490-rb3gen2.dts](https://github.com/torvalds/linux/blob/master/arch/arm64/boot/dts/qcom/qcs6490-rb3gen2.dts) or [https://github.com/torvalds/linux/blob/master/arch/arm64/boot/dts/qcom/sa8775p.dtsi](https://github.com/torvalds/linux/blob/master/arch/arm64/boot/dts/qcom/sa8775p.dtsi) or [https://git.kernel.org/pub/scm/linux/kernel/git/qcom/linux.git/tree/arch/arm64/boot/dts/qcom/qcs615.dtsi?h=arm64-for-6.16](https://git.kernel.org/pub/scm/linux/kernel/git/qcom/linux.git/tree/arch/arm64/boot/dts/qcom/qcs615.dtsi?h=arm64-for-6.16). - **[QCS6490 and QCS5430 interfaces overview](https://docs.qualcomm.com/doc/80-70023-8/topic/qcs6490-and-qcs5430-interface-overview.html)** - **[Dragonwing IQ-9075 interface overview](https://docs.qualcomm.com/doc/80-70023-8/topic/qcs9075-interface-overview.html)** - **[Dragonwing IQ-8275 interface overview](https://docs.qualcomm.com/doc/80-70023-8/topic/qcs8275-interface-overview.html)** - **[Dragonwing IQ-615 interface overview](https://docs.qualcomm.com/doc/80-70023-8/topic/iq-615-interface-overview.html)** Last Published: Dec 23, 2025 [Previous Topic Interfaces documentation](https://docs.qualcomm.com/bundle/publicresource/80-70023-8/topics/interface-documentation.md) [Next Topic QCS6490 and QCS5430 interfaces overview](https://docs.qualcomm.com/bundle/publicresource/80-70023-8/topics/qcs6490-and-qcs5430-interface-overview.md)