Hej
It's friday and I have some time to play a bit around. I like to build a
simple test-adapter using a RPi. I want to connect some of the 40GPIO pins
with a custom mainboard. For that I like to define the pin behaviour by an
own dts file.
I created my own dts file (testboard.dts) + a simple patch for
"arch/arm/boot/dts/Makefile" to add the file.
For adding them into the build-process I am append the kernel build
(linux-raspberrypi%.bbappend).
Now I have problems bringing them together, because the name of the
git/source links changes (git -> linux-raspberrypi2-standard-build/source
). Maybe some one has an idea?
I put the listings of the files below:
########## linux-raspberrypi%.bbappend ##########
FILESEXTRAPATHS_prepend := "${THISDIR}/${PN}:"
SRC_URI += "file://testboard.dts
;subdir=linux-raspberrypi2-standard-build/source/arch/arm/boot/dts \
file://0001-add-testboard-to-makefile.patch \
"
PACKAGE_ARCH = "raspberrypi2"
KERNEL_DEVICETREE += "testboard.dtb"
#############################################
########## 0001-add-testboard-to-makefile.patch ##########
--- a/arch/arm/boot/dts/Makefile
+++ b/arch/arm/boot/dts/Makefile
@@ -1,4 +1,8 @@
ifeq ($(CONFIG_OF),y)
+
+# my own dts files
+dtb-$(CONFIG_ARCH_BCM2835) += \
+ testboard.dts
dtb-$(CONFIG_ARCH_BCM2835) += \
bcm2708-rpi-b.dtb \
#############################################
########## testboard.dts ##########
/dts-v1/;
#include "bcm2836.dtsi"
#include "bcm2835-rpi.dtsi"
#include "bcm283x-rpi-smsc9514.dtsi"
#include "bcm283x-rpi-usb-host.dtsi"
/ {
compatible = "raspberrypi,2-model-b", "brcm,bcm2836";
model = "RPi test";
memory {
reg = <0 0x40000000>;
};
leds {
act {
gpios = <&gpio 47 0>;
};
pwr {
label = "PWR";
gpios = <&gpio 35 0>;
default-state = "keep";
linux,default-trigger = "default-on";
};
};
};
&gpio {
pinctrl-0 = <&gpioout &alt0 &i2s_alt0>;
/* I2S interface */
i2s_alt0: i2s_alt0 {
brcm,pins = <18 19 20 21>;
brcm,function = <BCM2835_FSEL_ALT0>;
status = "disabled";
};
cord0: cord0 {
brcm,pins = <5 6 25>;
brcm,function = <BCM2835_FSEL_ALT2>;
status = "okay";
};
};
&hdmi {
hpd-gpios = <&gpio 46 GPIO_ACTIVE_LOW>;
status = "disabled";
};
#############################################
For that I put a question on stackoverflow:
https://stackoverflow.com/questions/44702426/how-to-setup-an-own-device-tree-for-a-raspberrypi-in-yocto
Regards form Germany!
Stefan
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