topic Re: IMX6ULL cannot detect USB stick with USB controller in i.MX Processors

IMX6ULL cannot detect USB stick with USB controller

Hirotoshi_Sato — Thu, 26 Jul 2018 05:01:54 GMT

Hi, I would like to use USB stick with my board using i.mx6ull.

However the usb stick is not detected. I checked "dmesg", "df", and "lsblk", but usb stick is not recognized.

I think my device tree is wrong, so would you tell me how to modify it?

related part of my device tree is as follows.

(I use usbotg2 as usb port)

&usbotg1 {
dr_mode = "host";
/*disable-over-current;*/
fsl,over-current-polarity-active-low;
pinctrl-0 = <&pinctrl_usb_otg1>;
status = "okay";
};
&usbotg2 {
dr_mode = "host";
/*disable-over-current;*/
fsl,over-current-polarity-active-low;
fsl,power-line-polarity-active-high;
pinctrl-0 = <&pinctrl_usb_otg2>;
status = "okay";
};
pinctrl_usb_otg1: usbotg1grp {
fsl,pins = <
MX6UL_PAD_GPIO1_IO01__USB_OTG1_OC 0x17059
MX6UL_PAD_GPIO1_IO04__USB_OTG1_PWR 0x17059
>;
};
pinctrl_usb_otg2: usbotg2grp {
fsl,pins = <
MX6UL_PAD_ENET2_TX_CLK__ANATOP_OTG2_ID 0x17059
MX6UL_PAD_ENET2_TX_DATA1__USB_OTG2_PWR 0x17059
MX6UL_PAD_ENET2_TX_EN__USB_OTG2_OC 0x17059
>;
};

and imx6ull.dtsi

usbphy1: usbphy@020c9000 {
compatible = "fsl,imx6ul-usbphy", "fsl,imx23-usbphy";
reg = <0x020c9000 0x1000>;
interrupts = <GIC_SPI 44 IRQ_TYPE_LEVEL_HIGH>;
clocks = <&clks IMX6UL_CLK_USBPHY1>;
phy-3p0-supply = <&reg_3p0>;
fsl,anatop = <&anatop>;
};
usbphy2: usbphy@020ca000 {
compatible = "fsl,imx6ul-usbphy", "fsl,imx23-usbphy";
reg = <0x020ca000 0x1000>;
interrupts = <GIC_SPI 45 IRQ_TYPE_LEVEL_HIGH>;
clocks = <&clks IMX6UL_CLK_USBPHY2>;
phy-3p0-supply = <&reg_3p0>;
fsl,anatop = <&anatop>;
};
aips2: aips-bus@02100000 {
compatible = "fsl,aips-bus", "simple-bus";
#address-cells = <1>;
#size-cells = <1>;
reg = <0x02100000 0x100000>;
ranges;
usbotg1: usb@02184000 {
compatible = "fsl,imx6ul-usb", "fsl,imx27-usb";
reg = <0x02184000 0x200>;
interrupts = <GIC_SPI 43 IRQ_TYPE_LEVEL_HIGH>;
clocks = <&clks IMX6UL_CLK_USBOH3>;
fsl,usbphy = <&usbphy1>;
fsl,usbmisc = <&usbmisc 0>;
fsl,anatop = <&anatop>;
ahb-burst-config = <0x0>;
tx-burst-size-dword = <0x10>;
rx-burst-size-dword = <0x10>;
status = "disabled";
};
usbotg2: usb@02184200 {
compatible = "fsl,imx6ul-usb", "fsl,imx27-usb";
reg = <0x02184200 0x200>;
interrupts = <GIC_SPI 42 IRQ_TYPE_LEVEL_HIGH>;
clocks = <&clks IMX6UL_CLK_USBOH3>;
fsl,usbphy = <&usbphy2>;
fsl,usbmisc = <&usbmisc 1>;
ahb-burst-config = <0x0>;
tx-burst-size-dword = <0x10>;
rx-burst-size-dword = <0x10>;
status = "okay";
};
usbmisc: usbmisc@02184800 {
#index-cells = <1>;
compatible = "fsl,imx6ul-usbmisc", "fsl,imx6q-usbmisc";
reg = <0x02184800 0x200>;
};

Re: IMX6ULL cannot detect USB stick with USB controller

igorpadykov — Thu, 26 Jul 2018 09:33:35 GMT

Hi Hirotoshi

one can try using external usb hub and with Demo Image

https://www.nxp.com/webapp/Download?colCode=L4.1.15_2.0.0_iMX6ULL&appType=license&location=null&Parent_nodeId=1337699481…

dts description can be found in sect.39.2.6 Changing the Controller Operation Mode

attached Linux Guide and

linux/arch/arm/boot/dts/imx6ull-14x14-evk.dts

imx6ull-14x14-evk.dts\dts\boot\arm\arch - linux-imx - i.MX Linux kernel

Best regards
igor
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Re: IMX6ULL cannot detect USB stick with USB controller

Hirotoshi_Sato — Fri, 27 Jul 2018 05:47:08 GMT

Hi igor, thank you for your answer.

Actually the resistance of my board was wrong.

After fixing it, changing MX6UL_PAD_ENET2_TX_DATA1__USB_OTG2_PWR 0x17059

into MX6UL_PAD_ENET2_TX_DATA1_GPIO2_IO12 0x17059 and adding

USB_CNTO {
               label = "gpio44";
               gpios = <&gpio2 12 0>;
               linux,default-trigger = "gpio";
               default-state = "off";
       };

, USB stick is come to be recognized.

However I would like to use USB_OTG2_PWR to utilize usb controller function against over currency problem and so on. Are there any way how to utilize the function?