Hi all,
I'm using a Beaglebone black with Barebox bootloader and want to realize
SPI with GPIO Bitbang.
I already have the communication implemented in C, but I can't get the
device tree file to work.
In am33xx.dtsi a normal SPI looks like:
spi0: spi@48030000 {
compatible = "ti,omap4-mcspi";
#address-cells = <1>;
#size-cells = <0>;
reg = <0x48030000 0x400>;
interrupts = <65>;
ti,spi-num-cs = <2>;
ti,hwmods = "spi0";
dmas = <&edma 16 0
&edma 17 0
&edma 18 0
&edma 19 0>;
dma-names = "tx0", "rx0", "tx1", "rx1";
status = "okay";
};
and it works fine, but how do I make an entry for GPIO bitbang?
For the Raspberry Pi it is something like:
spi: spi@7e204000 { compatible = "spi-gpio"; reg =
<0x7e204000 0x1000>; interrupts = <2 22>; clocks =
<&clocks BCM2835_CLOCK_VPU>; #address-cells = <1>; status =
"okay"; ranges; gpio-sck = <&gpio 11 0>;
gpio-miso = <&gpio 9 0>; gpio-mosi = <&gpio 10 0>;
cs-gpios = <&gpio 8 1>; num-chipselects = <1>; spidev{
compatible = "spidev"; reg = <0>;
#address-cells = <1>; #size-cells = <0>;
spi-max-frequency = <1000000>; };
How do I know which Pins to ste for gpio-mosi, gpio-miso, ... and how can I see
how the Pins are called on the Pin layout?
How is e.g. GPIO 49 referenced here? Is it something like gpio-mosi = <&gpio 49
0>;?
Thanks a lot and kind Regards,
Kai
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