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A bus facilitates data transfer among various system components. You can use the DT properties to configure the Qualcomm Universal Peripheral (QUP) v3 serial interface device nodes. QUP v3 supports interintegrated circuit (I2C), serial peripheral interface (SPI), and universal asynchronous receiver-transmitter (UART) serial engines. The DT properties include the active and sleep settings for these serial engines. For more information about QUP v3 and its peripheral interfaces, see Overview of peripheral interfaces. You can apply the serial engine protocol and active configurations when the firmware loads onto the serial engine. You can configure the following Linux host files:
  • boot_images/boot/Settings/Soc/<chipset>/Core/Buses/qup_common/<chipset>-qupv3-pinctrl.dtsi
  • boot_images/boot/Settings/Soc/<chipset>/Core/Buses/qup_common/<chipset>-qupv3.dtsi
In &top_qup{k}_se{n}, k represents the QUP number and n represents the serial engine number. The table lists the DT properties:
Property nameProperty descriptionData typePossible values/value rangeDevice behavior
status = "disabled";Status control to enable/disable serial interfaces supported for QUP v3 serial engine (I2C/SPI/UART) protocols.String
  • Okay
  • Disabled
Enables or disables the serial engine.
&top_qup{k}_se{n}_i2c_activeGPIOs active settings for I2C serial engines.UINT32-arrayReference to a node label.Sets active GPIO configurations for the I2C protocol.
&top_qup{k}_se{n}_i2c_sleepGPIOs sleep settings for I2C.UINT32-arrayReference to a node label.Sets sleep GPIO configurations for the I2C protocol.
&top_qup{k}_se{n}_spi_activeGPIOs active settings for SPI.UINT32-arrayReference to a node label.Sets active GPIO configurations for the SPI protocol.
&top_qup{k}_se{n}_spi_sleepGPIOs sleep settings for SPI.UINT32-arrayReference to a node label.Sets sleep GPIO configurations for the SPI protocol.
&top_qup{k}_se{n}_uart_activeGPIOs active settings for UART.UINT32-arrayReference to a node label.Sets active GPIO configurations for the UART protocol.
&top_qup{k}_se{n}_uart_sleepGPIOs sleep settings for UART.UINT32-arrayReference to a node label.Sets sleep GPIO configurations for the UART protocol.

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Sample configuration

TOP_QUP_0{}
/*TOP_QUP_0_SE_0 Instance */
TOP_QUP_0_SE_0
status = "disabled"; /* status to enable/disable SE0 Node */
pinctrl-0  = <&top_qup0_se0_i2c_active>;
pinctrl-1  = <&top_qup0_se0_i2c_sleep>;
pinctrl-2  = <&top_qup0_se0_spi_active>;
pinctrl-3  = <&top_qup0_se0_spi_sleep>;
pinctrl-4  = <&top_qup0_se0_uart_active>;
pinctrl-5  = <&top_qup0_se0_uart_sleep>;