2388452_en-US

[#1]

iMX8M Plus - Flexspi chip select pin

On the i.MX8M Plus EVK, the ECSPI chip select signal can be configured using a GPIO pin.

Could you please confirm whether FlexSPI also supports GPIO-based chip-select signals, or whether only the dedicated FlexSPI chip select pins can be used?

As per our requirement, we need two chip select signals for FlexSPI. Kindly suggest the recommended configuration for supporting two FlexSPI devices.

Re: iMX8M Plus - Flexspi chip select pinHi @pengyong
What we can do for two chip select of QSPI? This is also from our requirement. If there is lack of CS pin means, can we use the any gpio has a chip select? If it will workRe: iMX8M Plus - Flexspi chip select pin

Hi @Govind1807 

You could use a GPIO-based chip select signal. However, you only have two FlexSPI Flash devices. Why would you use a GPIO as the chip select signal?

The imx8mp has four FLEX SS signals that can be used directly：

https://github.com/nxp-imx/linux-imx/blob/5768b67a64961d932b7c50adf15ba3f5bfcc8f70/arch/arm64/boot/d...

B.R

Re: iMX8M Plus - Flexspi chip select pin

Hi @pengyong_zhang ,
What we can do for two chip select of QSPI? This is also from our requirement. If there is lack of CS pin means, can we use the any gpio has a chip select? If it will work or not?

Re: iMX8M Plus - Flexspi chip select pin

Hi @Govind1807 

What we can do for two chip select of QSPI?

>>>For information on configuring QSPI CS, please refer to the following dts file:

https://github.com/nxp-imx/linux-imx/blob/5b372337acc9c764ce9e92f272e69d0b494ab38f/arch/arm64/boot/d...

This is also from our requirement. If there is lack of CS pin means, can we use the any gpio has a chip select? If it will work or not?

>>>Yes, you can use GPIO for your CS pin As long as your driver supports GPIO.

B.R