Dolf Andringa Posted February 26, 2020 Share Posted February 26, 2020 Armbianmonitor: http://ix.io/2cHc I want to drive 2 SPI devices on my orangepi zero. I enabled `spi-spidev` and `spi-add-cs1` overlays and set `param_spidev_spi_bus` to 1. But by I still get only `/dev/spi1.0` available. When I add `param_spidev_spi_cs=1`, I get `/dev/spi1.1` but `/dev/spi1.0` disappears. Do I see it correctly that I can choose *either* `/dev/spi1.0` *or* `/dev/spi1.1` but not both with that overlay? How can I activate both cs pins? There are a bunch of example custom files out there, but none are meant specifically for the setup where I need spi1 (instead of spi0) and need to use a GPIO pin for cs1. And I can't really find any docs on how to write my own overlay. So any help is appreciated. Link to comment Share on other sites More sharing options...
Dolf Andringa Posted February 26, 2020 Author Share Posted February 26, 2020 OK, lol, I figured it out. I created a file (in my homedir on the orangepi) called spi-double-spidev-cs.dt` with the folliowing content: /dts-v1/; /plugin/; / { compatible = "allwinner,sun8i-h3"; fragment@0 { 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"; }; spidev@1 { reg = <1>; /* Chip Select 1 */ compatible = "spidev"; spi-max-frequency = <1000000>; status = "okay"; }; }; }; }; Then I enabled that overlay with `armbian-add-overlay spi-double-spidev-cs.dts`. This automatically compiles the overlay and adds it to `/boot/armbianEnv.txt`. Just make sure you add the following parameter to `/boot/armbianEnv.txt` as well: param_spidev_spi_bus=1 Link to comment Share on other sites More sharing options...
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