How to use other CS of SPI, except for CS0 on s32g274rdb ？

[Zzzz1]

I connected two mcp2518fd chips on spi5 of s32g274rdb2, with CS0 functioning normally and CS1 failing to initialize. I checked the IO signal table and found that only PCS0 has two input and output modes, while other PCSs only have output modes. Do I have to use GPIO analog CS when using other chips?

Here is my device tree configuration.

dspi5_pins: dspi5_pins {

/* SPI5_SOUT */

dspi5_grp0 {

pinmux = <S32CC_PINMUX(173, FUNC3)>;

output-enable;

slew-rate = <S32CC_GPIO_3V3_SLEW_50MHZ>;

};

/* SPI1_PCS0_O */

dspi5_grp1 {

pinmux = <S32CC_PINMUX(171, FUNC5)>;

output-enable;

input-enable;

slew-rate = <S32CC_GPIO_3V3_SLEW_50MHZ>;

bias-pull-up;

};

/* SPI1_PCS1_O */

dspi5_grp2 {

pinmux = <S32CC_PINMUX(114, FUNC5)>;

output-enable;

slew-rate = <S32CC_GPIO_3V3_SLEW_50MHZ>;

bias-pull-up;

};

/* SPI1_SCK_O */

dspi5_grp3 {

pinmux = <S32CC_PINMUX(175, FUNC4)>;

output-enable;

input-enable;

slew-rate = <S32CC_GPIO_3V3_SLEW_50MHZ>;

};

/* SPI1_SIN */

dspi5_grp4 {

pinmux = <S32CC_PINMUX(174, FUNC0)>;

input-enable;

slew-rate = <S32CC_GPIO_3V3_SLEW_50MHZ>;

bias-pull-up;

};

dspi5_grp5 {

pinmux = <S32CC_PINMUX(1005, FUNC3)>, //SPI5_PCS0_I

<S32CC_PINMUX(1006, FUNC4)>, //SPI5_SCK_I

<S32CC_PINMUX(1007, FUNC3)>; //SPI5_SIN

};

};

&spi5 {

pinctrl-names = "default";

pinctrl-0 = <&dspi5_pins>;

#address-cells = <1>;

#size-cells = <0>;

status = "okay";

spi-num-chipselects = <2>;

 mcp0: mcp2518fd@0 {

 compatible = "microchip,mcp2518fd";

 reg = <0>;

 pinctrl-names = "default";

 pinctrl-0 = <&mcp0_int_pin>;

spi-max-frequency = <10000000>;

        interrupt-parent = <&gpio>;

        interrupts = <4 IRQ_TYPE_LEVEL_LOW>; 

 clocks = <&osc40m>;

 clock-names = "osc";

 };

mcp1: mcp2518fd@1 {

compatible = "microchip,mcp2518fd";

reg = <1>;

pinctrl-names = "default";

pinctrl-0 = <&mcp1_int_pin>;

spi-max-frequency = <10000000>;

interrupt-parent = <&gpio>;

        interrupts = <7 IRQ_TYPE_LEVEL_LOW>;

clocks = <&osc40m>;

clock-names = "osc";

};

};

Here is my log information:

mcp251xfd spi5.0 can2: MCP2518FD rev0.0 (-RX_INT -PLL -MAB_NO_WARN +CRC_REG +CRC_RX +CRC_TX +ECC -HD o:40.00MHz c:40.00MHz m:10.00MHz rs:10.00MHz es:0.00MHz rf:10.00MHz ef:0.00MHz) successfully initialized.
[ OK ] Started Network Configuration.
[ 7.979780] s32cc-dwmac 4033c000.ethernet eth0: Register MEM_TYPE_PAGE_POOL RxQ-0
[ 7.990469] mcp251xfd spi5.1 (unnamed net_device) (uninitialized): Failed to read Oscillator Configuration Register (osc=0xffffffff).

Thank you very much!

[chenyin_h · Accepted solution]

Hello, @Zzzz1 

Thanks for your reply.

There are 5 PCS signals supported on SPI5, so it is possible to connect more than 1 SPI devices.

Yes, only PCS0 supports IO

May I know exactly the current issues arise? only one spi device could work correctly?(PCS0), while the other one connected could not?(via PCS1)

BR

Chenyin

[Zzzz1]

Thank you for your reply.
I have already resolved the issue. It's because there's a hardware issue.
I tried using PCS and GPIO cs, and both were successful.
Your products are great!

BR,
Zzz

[chenyin_h]

Hello, @Zzzz1 

Thanks for the post.

Let me directly support it via your another post together.

BR

Chenyin

[Zzzz1]

Thank you for your reply.
Yes, I reworked the circuit board based on s32g274a-rdb2. On spi5, sja1110 has been removed and replaced with two MCP chips to expand the number of CAN interfaces. Can I get your support ?

BR,

Zzz