Hi
I am using a custom hardware which is based on Beaglebone black. The hardware difference between BBB and our board is that USB0 is changed to work in host mode and USB1 in peripheral mode. I need to make the necessary changes in kernel as well to make this work. I have built the kernel and uboot based on the instructions given in http://elinux.org/Building_BBB_Kernel.
As far as I understand, to change the behaviour of USB port, we need to change the corresponding dts file. So I tried to edit the ‘am33xx.dtsi’ and ‘am335x-bone-common.dtsi’ files and change the ‘dr_mode’ value of the USBs. I have seen the 'dr_mde" in the previous versions of these files but in the latest ones this is missing and I assume the USB ports are configured for OTG mode.
am33xx.dtsi (latest) :
" usb_otg_hs: usb@47400000 {
compatible = “ti,musb-am33xx”;
reg = <0x47400000 0x1000 /* usbss /
0x47401000 0x800 / musb instance 0 /
0x47401800 0x800>; / musb instance 1 /
interrupts = <17 / usbss /
18 / musb instance 0 /
19>; / musb instance 1 */
multipoint = <1>;
num-eps = <16>;
ram-bits = <12>;
port0-mode = <3>;
port1-mode = <1>;
power = <250>;
ti,hwmods = “usb_otg_hs”;
status = “disabled”;
}; "
am33x.dtsi (old) :
"usb: usb@47400000 {
compatible = “ti,am33xx-usb”;
reg = <0x47400000 0x1000>;
ranges;
#address-cells = <1>;
#size-cells = <1>;
ti,hwmods = “usb_otg_hs”;
status = “disabled”;
usb_ctrl_mod: control@44e10620 {
compatible = “ti,am335x-usb-ctrl-module”;
reg = <0x44e10620 0x10
0x44e10648 0x4>;
reg-names = “phy_ctrl”, “wakeup”;
status = “disabled”;
};
usb0_phy: usb-phy@47401300 {
compatible = “ti,am335x-usb-phy”;
reg = <0x47401300 0x100>;
reg-names = “phy”;
status = “disabled”;
ti,ctrl_mod = <&usb_ctrl_mod>;
};
usb0: usb@47401000 {
compatible = “ti,musb-am33xx”;
status = “disabled”;
reg = <0x47401400 0x400
0x47401000 0x200>;
reg-names = “mc”, “control”;
interrupts = <18>;
interrupt-names = “mc”;
dr_mode = “host”;
mentor,multipoint = <1>;
mentor,num-eps = <16>;
mentor,ram-bits = <12>;
mentor,power = <500>;
phys = <&usb0_phy>;
dmas = <&cppi41dma 0 0 &cppi41dma 1 0
&cppi41dma 2 0 &cppi41dma 3 0
&cppi41dma 4 0 &cppi41dma 5 0
&cppi41dma 6 0 &cppi41dma 7 0
&cppi41dma 8 0 &cppi41dma 9 0
&cppi41dma 10 0 &cppi41dma 11 0
&cppi41dma 12 0 &cppi41dma 13 0
&cppi41dma 14 0 &cppi41dma 0 1
&cppi41dma 1 1 &cppi41dma 2 1
&cppi41dma 3 1 &cppi41dma 4 1
&cppi41dma 5 1 &cppi41dma 6 1
&cppi41dma 7 1 &cppi41dma 8 1
&cppi41dma 9 1 &cppi41dma 10 1
&cppi41dma 11 1 &cppi41dma 12 1
&cppi41dma 13 1 &cppi41dma 14 1>;
dma-names =
“rx1”, “rx2”, “rx3”, “rx4”, “rx5”, “rx6”, “rx7”,
“rx8”, “rx9”, “rx10”, “rx11”, “rx12”, “rx13”,
“rx14”, “rx15”,
“tx1”, “tx2”, “tx3”, “tx4”, “tx5”, “tx6”, “tx7”,
“tx8”, “tx9”, “tx10”, “tx11”, “tx12”, “tx13”,
“tx14”, “tx15”;
};
usb1_phy: usb-phy@47401b00 {
compatible = “ti,am335x-usb-phy”;
reg = <0x47401b00 0x100>;
reg-names = “phy”;
status = “disabled”;
ti,ctrl_mod = <&usb_ctrl_mod>;
};
usb1: usb@47401800 {
compatible = “ti,musb-am33xx”;
status = “disabled”;
reg = <0x47401c00 0x400
0x47401800 0x200>;
reg-names = “mc”, “control”;
interrupts = <19>;
interrupt-names = “mc”;
dr_mode = “peripheral”;
mentor,multipoint = <1>;
mentor,num-eps = <16>;
mentor,ram-bits = <12>;
mentor,power = <500>;
phys = <&usb1_phy>;
dmas = <&cppi41dma 15 0 &cppi41dma 16 0
&cppi41dma 17 0 &cppi41dma 18 0
&cppi41dma 19 0 &cppi41dma 20 0
&cppi41dma 21 0 &cppi41dma 22 0
&cppi41dma 23 0 &cppi41dma 24 0
&cppi41dma 25 0 &cppi41dma 26 0
&cppi41dma 27 0 &cppi41dma 28 0
&cppi41dma 29 0 &cppi41dma 15 1
&cppi41dma 16 1 &cppi41dma 17 1
&cppi41dma 18 1 &cppi41dma 19 1
&cppi41dma 20 1 &cppi41dma 21 1
&cppi41dma 22 1 &cppi41dma 23 1
&cppi41dma 24 1 &cppi41dma 25 1
&cppi41dma 26 1 &cppi41dma 27 1
&cppi41dma 28 1 &cppi41dma 29 1>;
dma-names =
“rx1”, “rx2”, “rx3”, “rx4”, “rx5”, “rx6”, “rx7”,
“rx8”, “rx9”, “rx10”, “rx11”, “rx12”, “rx13”,
“rx14”, “rx15”,
“tx1”, “tx2”, “tx3”, “tx4”, “tx5”, “tx6”, “tx7”,
“tx8”, “tx9”, “tx10”, “tx11”, “tx12”, “tx13”,
“tx14”, “tx15”;
};
cppi41dma: dma-controller@47402000 {
compatible = “ti,am3359-cppi41”;
reg = <0x47400000 0x1000
0x47402000 0x1000
0x47403000 0x1000
0x47404000 0x4000>;
reg-names = “glue”, “controller”, “scheduler”, “queuemgr”;
interrupts = <17>;
interrupt-names = “glue”;
#dma-cells = <2>;
#dma-channels = <30>;
#dma-requests = <256>;
status = “disabled”;
};
}; "
As we can see, in the old one, there is ‘dr_mode’ option for usb0 and usb1 to change the operation mode but it is not present in latest one.
Also in am335x-bone-common.dtsi,
latest:
" &usb_otg_hs {
interface_type = <1>;
power = <250>;
status = “okay”;
}; "
is provided but in the old one it was
" &usb {
status = “okay”;
};
&usb_ctrl_mod {
status = “okay”;
};
&usb0_phy {
status = “okay”;
};
&usb1_phy {
status = “okay”;
};
&usb0 {
status = “okay”;
dr_mode = “host”;
};
&usb1 {
status = “okay”;
dr_mode = “peripheral”;
};
&cppi41dma {
status = “okay”;
}; "
Kindly request assistance to change the USB from OTG to HOST and PERIPHERAL seperately