i.MX8QXP - driver spi-nxp-fspi.c - flexpsi bus B not working

[MarcoSandrelli]

Hello,

I encoutered an issue related to the FLEXSPI BUS of the i.MX8QXP SoC (driver drivers / spi / spi-nxp-fspi.c of kernel 5.4.70). According to the documentation  the driver can be configured as follows:

Required SPI slave node properties:
  - reg :        There are two buses (A and B) with two chip selects each.
                 This encodes to which bus and CS the flash is connected:
                 - <0>: Bus A, CS 0
                 - <1>: Bus A, CS 1
                 - <2>: Bus B, CS 0
                 - <3>: Bus B, CS 1

The Pinmux in dts is the follow:

pinctrl_flexspi0: flexspi0grp {
fsl,pins = <

IMX8QXP_QSPI0A_SCLK_LSIO_QSPI0A_SCLK 0x06000021
IMX8QXP_QSPI0A_SS0_B_LSIO_QSPI0A_SS0_B 0x06000021
IMX8QXP_QSPI0A_DATA0_LSIO_QSPI0A_DATA0 0x06000021
IMX8QXP_QSPI0A_DATA1_LSIO_QSPI0A_DATA1 0x06000021
IMX8QXP_QSPI0A_DATA2_LSIO_QSPI0A_DATA2 0x06000021
IMX8QXP_QSPI0A_DATA3_LSIO_QSPI0A_DATA3 0x06000021

IMX8QXP_QSPI0B_SCLK_LSIO_QSPI0B_SCLK 0x06000021
IMX8QXP_QSPI0B_SS0_B_LSIO_QSPI0B_SS0_B 0x06000021
IMX8QXP_QSPI0B_SS1_B_LSIO_QSPI0B_SS1_B 0x06000021

IMX8QXP_QSPI0B_DATA0_LSIO_QSPI0B_DATA0 0x06000021
IMX8QXP_QSPI0B_DATA1_LSIO_QSPI0B_DATA1 0x06000021
IMX8QXP_QSPI0B_DATA2_LSIO_QSPI0B_DATA2 0x06000021
IMX8QXP_QSPI0B_DATA3_LSIO_QSPI0B_DATA3 0x06000021

>;
};

The interface is configured in the following way:

&flexspi0 {
pinctrl-names = "default";
pinctrl-0 = <&pinctrl_flexspi0>;
status = "okay";

flash_b_0: flash_b-mx2@2 {
compatible = "macronix,mx25u6435f", "jedec,spi-nor";
reg = <2>;
#address-cells = <1>;
#size-cells = <1>;
spi-max-frequency = <25000000>;
status = "okay";
spi-tx-bus-width = <4>;
spi-rx-bus-width = <4>;

};
};

As described, this eeprom should be recognized by BUS FLEXSPI B in Chip Select 0. But what happens is that we see Chip Select and Clock working correctly but no data comes out of the SoC in any of the 4 lines: DATA0, DATA1, DATA2, DATA3. I don't know if it's a known problem or I'm doing something wrong. Thanks for the support.

Best Regards

[MarcoSandrelli]

Hi Jimmy,

I want to use the eeprom at kernel level, not for boot.

I met this issue at kernel level.

Thank you for your answer.

[jimmychan]

Are you want to boot from the flash that connected on QSPI0B?

[jimmychan]

Is the macronix driver load/running correct when kernel boot up? could you send me the bootup log?

[MarcoSandrelli]

Hi Jimmy,

main issue is that there are not DATA signals coming out from i.MX8QX QSPIB, same eeprom is installed in QSPIA and it is correctly recognized from the driver.

[jimmychan]

please try :

lash_b_0: flash_b-mx2@0 {
compatible = "macronix,mx25u6435f", "jedec,spi-nor";
reg = <2>;

[MarcoSandrelli]

Hi Jimmy,

I try it but i doesn't work, the DATA PINs doesn't exchange data.

I try IMX8QXP_QSPI0B_DATA0_LSIO_QSPI0B_DATA0 muxed as GPIO and it works as expected, so physical connection is ok.

[jimmychan]

Could you show me the part of the schematic about the connection between eeprom and flexspi?

[MarcoSandrelli]

Hi,

in attachment the schematic.

Best Regards

[jimmychan]

is both QSPI0A and QSPI0B connect the eeprom?

please also try "flash_b_0: flash_b-mx2@1" in your dts file.