NanoPi NEO Core-LTS how to use a 2 slave spi device ?

DenisS · September 22, 2023

I have board which has 2 slaves on the SPI bus, requiring ce0 and ce1.

My system: Armbian 23.8.1 Bookworm with Linux 6.1.47-current-sunxi

I applied overlays: spi-add-cs1 and spi-spidev, there's an spi in the system.

As soon as I apply spi-double-spidev-bus.dts, the spi disappears.

Скрытый текст

/dts-v1/;
/plugin/;

/ {
compatible = "allwinner,sun4i-a10", "allwinner,sun7i-a20", "allwinner,sun8i-h3", "allwinner,sun50i-a64", "allwinner,sun50i-h5";

   fragment@0 {
       target = <&spi0>;
       __overlay__ {
           #address-cells = <1>;
           #size-cells = <0>;
           status = "okay";

           spidev@0 {
               reg = <0>; /* Chip Select 0 */
               compatible = "spidev";
               spi-max-frequency = <1000000>;
               status = "okay";
           };
       };
   };

   fragment@1 {
       target = <&spi1>;
       __overlay__ {
           #address-cells = <1>;
           #size-cells = <0>;
           status = "okay";

           spidev@0 {
               reg = <0>; /* Chip Select 0 */
               compatible = "spidev";
               spi-max-frequency = <1000000>;
               status = "okay";
           };
       };
   };
};

How to make two cs?

As soon as I apply spi-double-spidev-bus.dts, the spi disappears.
Also, as I assume there is a problem with CS1, I reassign it with my overlay:

Скрытый текст

/dts-v1/;
/plugin/;

/ {
compatible = "allwinner,sun8i-h3";

fragment@0 {
target = <&pio>;
__overlay__ {
spi0_cs1: spi0_cs1 {
pins = "PC3";
function = "gpio_out";
output-high;
};

};
};

fragment@1 {
target = <&spi0>;
__overlay__ {
pinctrl-names = "default", "default";
pinctrl-1 = <&spi0_cs1>;
cs-gpios = <&pio 2 3 0>; /* PC3 */
};
};

};

CS is reassigned in the system, but the spi device polls once. When polling again, errors occur. When I manually set the cs there are no re-polling errors.

I use "spi-device" - accessing the SPI serial bus using Node.js on Linux boards https://github.com/fivdi/spi-device

On another board, the author's "spi-device" SPI polling works without problems https://github.com/fivdi/spi-device/issues/27

Please help to make sense of these two issues.

Werner · September 22, 2023

Providing logs with

armbianmonitor -u

helps with troubleshooting and significantly raises chances that issue gets addressed.

DenisS · September 22, 2023

https://paste.armbian.com/wosilicuda

DenisS · September 26, 2023

I installed my overlay:

Скрытый текст

/dts-v1/;
/plugin/;

/ {
compatible = "allwinner,sun8i-h3";

fragment@2 {
target = <&pio>;
__overlay__ {
spi0_pi_pins: spi0-pi-pins {
pins = "PC0", "PC1", "PC2";
function = "spi0";
};

spi0_cs0_pi_pin: spi0-cs0-pi-pin {
pins = "PC3";
function = "spi0";
};

spi0_cs1_pi_pin: spi0-cs1-pi-pin {
pins = "PG8";
function = "spi0";
};
};
};

fragment@1 {
target = <&spi0>;
__overlay__ {
#address-cells = <1>;
#size-cells = <0>;
status = "okay";

pinctrl-names = "default";
pinctrl-0 = <&spi0_pi_pins>;
spi-max-frequency = <1000000>;
num-chipselects = <2>;
spidev@0 {
reg = <0>; /* Chip Select 0 */
compatible = "armbian,spi-dev";
pinctrl-names = "default";
pinctrl-0 = <&spi0_cs0_pi_pin>;
status = "okay";
};

spidev@1 {
reg = <1>; /* Chip Select 1 */
compatible = "armbian,spi-dev";
pinctrl-names = "default";
pinctrl-0 = <&spi0_cs1_pi_pin>;
status = "okay";
};
};
};
};

two spi's appearing:
den@nanopineo:~$ ls /dev/ | grep spi
spidev0.0
spidev0.1

den@nanopineo:~$ sudo cat /sys/kernel/debug/gpio
gpiochip0: GPIOs 0-223, parent: platform/1c20800.pinctrl, 1c20800.pinctrl:
gpio-67 ( |spi0 CS0 ) out hi ACTIVE LOW
gpio-166 ( |cd ) in hi ACTIVE LOW
gpio-200 ( |sysfs ) out hi
gpio-203 ( |sysfs ) in lo
gpio-204 ( |usb0_id_det ) in hi IRQ

gpiochip1: GPIOs 352-383, parent: platform/1f02c00.pinctrl, 1f02c00.pinctrl:
gpio-355 ( |k1 ) in hi IRQ ACTIVE LOW
gpio-358 ( |vdd-cpux ) out lo

den@nanopineo:~$ dmesg | grep spi
[ 2.600676] spidev@0 enforce active low on chipselect handle
[ 4.022764] sun8i-h3-pinctrl 1c20800.pinctrl: unsupported function spi0 on pin PG8
[ 4.022867] spidev spi0.1: there is not valid maps for state default
https://paste.armbian.com/yurepiyuve

spi 0.0 doesn't work!
How do I get it to work ? And set PG8 as cs1?

Edited September 26, 2023 by DenisS

Gunjan Gupta · September 26, 2023

1 hour ago, DenisS said:

spi0_cs1_pi_pin: spi0-cs1-pi-pin {
pins = "PG8";
function = "spi0";
};

Based on the schematics of the board, PG8 only support uart1 or gpio function. So you can't set function = spi0 for the same.

Now this is a shot in the dark, but may by you can experiment with cs-gpios property.

going · September 26, 2023

2 часа назад, DenisS сказал:

spi0_cs0_pi_pin: spi0-cs0-pi-pin {
pins = "PC3";
function = "spi0";
};

spi0_cs1_pi_pin: spi0-cs1-pi-pin {
pins = "PG8";
function = "spi0";

function = "gpio_out";