Hi all.

I have problem with SPI on my board .

I find solution but I want to know why .. 

On first :

Linux orangepizero 5.4.20-sunxi #20.02.1 SMP Mon Feb 17 02:09:41 CET 2020 armv7l armv7l armv7l GNU/Linux

If go to armbian-config and enable SpiDev .. then reboot not find SPI device on my dev tree ..

if look to armbianEnv.txt there is spi-spidev but on dev tree no SPI device ..

My solution is this :

on /boot/dtb/overlay is file sun8i-h3-spi-spidev.dtbo , decompile it and there is this text :

/dts-v1/;
/plugin/;

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

	fragment@0 {
		target-path = "/aliases";
		__overlay__ {
			spi0 = "/soc/spi@01c68000";
			spi1 = "/soc/spi@01c69000";
		};
	};

	fragment@1 {
		target = <&spi0>;
		__overlay__ {
			#address-cells = <1>;
			#size-cells = <0>;
			spidev {
				compatible = "spidev";
				status = "disabled";
				reg = <0>;
				spi-max-frequency = <1000000>;
			};
		};
	};

	fragment@2 {
		target = <&spi1>;
		__overlay__ {
			#address-cells = <1>;
			#size-cells = <0>;
			spidev {
				compatible = "spidev";
				status = "disabled";
				reg = <0>;
				spi-max-frequency = <1000000>;
			};
		};
	};
};

I don't know why  but if change text to this :

/dts-v1/;
// magic:               0xd00dfeed
// totalsize:           0x314 (788)
// off_dt_struct:       0x38
// off_dt_strings:      0x2b4
// off_mem_rsvmap:      0x28
// version:             17
// last_comp_version:   16
// boot_cpuid_phys:     0x0
// size_dt_strings:     0x60
// size_dt_struct:      0x27c

/ {
    compatible = "allwinner,sun8i-h3";
    fragment@0 {
        target-path = "/aliases";
        __overlay__ {
            spi0 = "/soc/spi@1c68000";
            spi1 = "/soc/spi@1c69000";
        };
    };
    fragment@1 {
        target = <0xffffffff>;
        __overlay__ {
            status = "okay";
            #address-cells = <0x00000001>;
            #size-cells = <0x00000000>;
            spidev@0 {
                compatible = "spidev";
                reg = <0x00000000>;
                spi-max-frequency = <0x000f4240>;
            };
        };
    };
    fragment@2 {
        target = <0xffffffff>;
        __overlay__ {
            status = "okay";
            #address-cells = <0x00000001>;
            #size-cells = <0x00000000>;
            spidev@0 {
                compatible = "spidev";
                reg = <0x00000000>;
                spi-max-frequency = <0x000f4240>;
            };
        };
    };
    __fixups__ {
        spi0 = "/fragment@1:target:0";
        spi1 = "/fragment@2:target:0";
    };
};

and recompile then all working ..

on my dev tree I see two devices:

crw-rw---- 1 root spidev 153, 0 Mar  8 16:55 /dev/spidev0.0
crw-rw---- 1 root spidev 153, 1 Mar  8 16:55 /dev/spidev1.0
 

 I test it on my Osciloscope and see signal , then I connect MISO wit MOSI and make test with spidev-test and work ..

now I connect real SPI device (any radio nRF24L01 or similar .. and try real test..

 

question is why I must do this ???

what is wrong??

 

best regards..

 

Edited March 9, 20206 yr by Sevc Dominik

On line status = "disabled" change to "okay" and move line to different position then works..

Edited March 9, 20206 yr by Sevc Dominik

I think you need to add param_spidev_spi_bus on armbianEnv.

allwinner overlay example