Environment
Verdin-iMX8M Plus
EVA board
Linux BSP5.4
Our customer wants to use CY15B104QSN F-RAM with QSPI.
I don’t know how to write a device tree.
Is there a driver to add from the default?
Best regards.
Hello @developer0916,
For general information about how to customize and build device trees you can check these two links:
In the imx8mp-verdin.dtsi file (located at arch/arm64/boot/dts/freescale/imx8mp-verdin.dtsi) inside the kernel source, you’ll find an example of the QSPI interface use:
/* Verdin QSPI_1 */
&flexspi {
pinctrl-names = "default";
pinctrl-0 = <&pinctrl_flexspi0>;
flash0: mt25qu256aba@0 {
#address-cells = <1>;
#size-cells = <1>;
compatible = "micron,mt25qu256aba";
reg = <0>;
spi-max-frequency = <80000000>;
spi-nor,ddr-quad-read-dummy = <6>;
};
};
According to this document, FRAM memories behave just like SPI NOR flash.
You may need to add the ID of your specific FRAM chip to the spi-nor.c file (drivers/mtd/spi-nor/spi-nor.c) like it’s mentioned on that article, so that the driver can detect the FRAM chip correctly.
Best regards,
Rafael Beims
Thank you for the good information.
Best regards.