spi cs-gpios issue (GPIO_ACTIVE_LOW does not work)

[2songh]

zephyr version: v2.4
my board: STM32l433
spi device: microchip,mcp23s08

---

[.dts file]

[prj.conf]

I want to get the input value of my device through spi communication.
But my cs-gpios only works with GPIO_ACTIVE_HIGH.
I hope it works with GPIO_ACTIVE_LOW.

---

(yellow: Chip Select / blue: Clock)

Is there a problem configuring my dts file or prj.conf file?
Additionally, Should I suspect a board configuration or gpio driver issue?

Any opinions are welcome, so please give me your advice.

[ndrs-pst]

@2songh, Since your Zephyr version is outdated, please use a currently supported version, such as v2.7.5 or
v3.5.99, along with the provided dts.
By the way, since cs-gpios are managed by spi_ll_stm32.c and shared among various SPI interface ICs, I believe it should be okay.

#include <freq.h>                           /* DT_FREQ_M */
&spi1 {
    status = "okay";
    cs-gpios = <&gpiob 12 GPIO_ACTIVE_LOW>;

    msp23s08: mcp23s08@0 {
        compatible = "microchip,mcp23sxx";
        reg  = <0>;
        spi-max-frequency = <DT_FREQ_M(5)>;

        gpio-controller;        /* The following descriptions are from gpio-controller.yaml */
        #gpio-cells = <2>;
        ngpios = <8>;           /* 8-bit (pins) */
        int-gpios = <&gpiob 22 GPIO_ACTIVE_LOW>;    /* optional, please adjust with your board or comment out */
        reset-gpios = <&gpiob 17 GPIO_ACTIVE_LOW>;  /* optional, please adjust with your board or comment out */
        status = "okay";
    };

[2songh]

Thanks for your answer.

We created driver mcp23s08 by referencing mcp23s17 in version 2.2.99.
mcp23s08 worked normally in that version.
(dts, prj.conf, pinmux, defconfig are all the same.)

Additionally, normal operation was achieved when tested using mcp23sxx in version 3.5.

Are we correct in seeing this as a problem with version 2.4?
We hope to use mcp23s08 in version 2.4.
Are there any more files or methods to check?

[ndrs-pst]

@2songh, Understood. If you're still looking to use the Zephyr 2.x version, I recommend opting for version 2.7.5.
Identifying regressions and managing backports might be more challenging in this case.