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add devicetree overlay

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This commit is contained in:
Stefan Seegel 2020-02-05 20:30:26 +01:00
parent cdfe345872
commit 160cf40b99
2 changed files with 58 additions and 0 deletions
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8
overlay/inst.sh Executable file
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dtc -@ -I dts -O dtb -o raspyrfm.dtbo raspyrfm.dts
cp raspyrfm.dtbo /boot/overlays/
echo "Comment this line in /boot/config.txt"
echo "#dtparam=spi=on"
echo "Add this line to /boot/config.txt"
echo "dtoverlay=raspyrfm"

50
overlay/raspyrfm.dts Normal file
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/dts-v1/;
/plugin/;
/ {
compatible = "brcm,bcm2835", "brcm,bcm2836", "brcm,bcm2708", "brcm,bcm2709";
fragment@0 {
target = <&spi0>;
frag0: __overlay__ {
#address-cells = <1>;
#size-cells = <0>;
pinctrl-0 = <&spi0_pins &spi0_cs_pins>;
status = "okay";
cs-gpios = <&gpio 8 1>, <&gpio 7 1>, <&gpio 5 1>, <&gpio 4 1>;
spidev@2{
compatible = "spidev";
reg = <2>; /* CE2 */
#address-cells = <1>;
#size-cells = <0>;
spi-max-frequency = <1000000>;
};
spidev@3{
compatible = "spidev";
reg = <3>; /* CE3 */
#address-cells = <1>;
#size-cells = <0>;
spi-max-frequency = <1000000>;
};
};
};
fragment@1 {
target = <&gpio>;
__overlay__ {
spi0_cs_pins: spi0_cs_pins {
brcm,pins = <8 7 5 4>;
brcm,function = <1>; /* out */
};
};
};
__overrides__ {
cs0_pin = <&frag0>,"cs-gpios:4", <&spi0_cs_pins>,"brcm,pins:0";
cs1_pin = <&frag0>,"cs-gpios:16", <&spi0_cs_pins>,"brcm,pins:4";
cs2_pin = <&frag0>,"cs-gpios:28", <&spi0_cs_pins>,"brcm,pins:8";
cs3_pin = <&frag0>,"cs-gpios:40", <&spi0_cs_pins>,"brcm,pins:12";
};
};