rider
#1
I’m trying to add NXP PCA9632 - i2c led controller to the DTB.
I connected the PCA9632 to I2C_A0 (pins 25-26),running “sudo i2cdetect -y 4” shows the PCA9632 on ‘62’ as expected.
My goal is to add the controlled as “/sys/class/leds/XXX_led” using the existing kernel driver:
I already decompiled the DTB into DTS.
From pca963x doc I know i need to add the following to the DTS:
pca9632: pca9632 {
compatible = "nxp,pca9632";
#address-cells = <1>;
#size-cells = <0>;
reg = <0x62>;
red@0 {
label = "red";
reg = <0>;
linux,default-trigger = "none";
};
green@1 {
label = "green";
reg = <1>;
linux,default-trigger = "none";
};
blue@2 {
label = "blue";
reg = <2>;
linux,default-trigger = "none";
};
unused@3 {
label = "unused";
reg = <3>;
linux,default-trigger = "none";
};
};
should i add it somewhere specific or just under the main tree?
should i add anything else regarding the i2c?
I would appreciate any help.
numbqq
#2
You need to add such devicetree node to i2c_AO node, like this:
diff --git a/arch/arm64/boot/dts/amlogic/kvim3_linux.dts b/arch/arm64/boot/dts/amlogic/kvim3_linux.dts
index f728e92..6160e87a 100644
--- a/arch/arm64/boot/dts/amlogic/kvim3_linux.dts
+++ b/arch/arm64/boot/dts/amlogic/kvim3_linux.dts
@@ -877,6 +877,34 @@
reg-data-type = <1>;
link-device = <&phycsi>;
};
+
+ pca9632: pca9632 {
+ compatible = "nxp,pca9632";
+ #address-cells = <1>;
+ #size-cells = <0>;
+ reg = <0x62>;
+
+ red@0 {
+ label = "red";
+ reg = <0>;
+ linux,default-trigger = "none";
+ };
+ green@1 {
+ label = "green";
+ reg = <1>;
+ linux,default-trigger = "none";
+ };
+ blue@2 {
+ label = "blue";
+ reg = <2>;
+ linux,default-trigger = "none";
+ };
+ unused@3 {
+ label = "unused";
+ reg = <3>;
+ linux,default-trigger = "none";
+ };
+ };
};
&audiobus {
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