imx6ul usb charger type detection

[asmaa]

Hello everyone,

I have added USB as otg and charger in our custom imx6ul board. I can see usb added and I also verified usb serial functionality which is working perfectly fine.

I also want to verify usb charger type(cdp,dcp,sdp) functionality which I am not able to do.

My device tree is as follows:

reg_usb_otg_vbus: regulator-usb-otg-vbus {
compatible = "regulator-fixed";
pinctrl-names = "default";
pinctrl-0 = <&pinctrl_regulator_usbotg_pwr>;
regulator-name = "usb_otg_vbus";
regulator-min-microvolt = <5000000>;
regulator-max-microvolt = <5000000>;
enable-active-high;
status = "okay";
};

&usbotg1 {
pinctrl-names = "default";
vbus-supply = <&reg_usb_otg_vbus>;
dr_mode = "otg";
imx6-usb-charger-detection;
srp-disable;
hnp-disable;
adp-disable;
status = "okay";
};

I can see usb device in sysfs:

root@imx6ulevk:~# cat /sys/class/udc/ci_hdrc.0/device/role
gadget

I followed i.MX Linux® Reference Manual, when I do following command 

cat /sys/class/power_supply/imx6_usb_charger/type

it says, No such directory. 

My kernel version is:

Linux imx6ulevk 4.19.35-04767-g8890ce5c8d98-dirty

Can anybody please let me know what I am missing?

Thanks,

Asma

[igorpadykov]

Hi Asma

one can try patch below:

diff --git a/arch/arm/boot/dts/imx6ul-14x14-evk.dts b/arch/arm/boot/dts/imx6ul-14x14-evk.dts
index 9099525..246d49c 100755
--- a/arch/arm/boot/dts/imx6ul-14x14-evk.dts
+++ b/arch/arm/boot/dts/imx6ul-14x14-evk.dts
@@ -742,6 +742,7 @@
     srp-disable;
     hnp-disable;
     adp-disable;
+    imx-usb-charger-detection;
     status = "okay";
 };
 
diff --git a/drivers/usb/chipidea/usbmisc_imx.c b/drivers/usb/chipidea/usbmisc_imx.c
index 60a4e4a..fe0c926
--- a/drivers/usb/chipidea/usbmisc_imx.c
+++ b/drivers/usb/chipidea/usbmisc_imx.c
@@ -546,8 +546,8 @@ static int imx6_charger_data_contact_detect(struct imx_usbmisc_data *data)
     if (i == 100) {
         dev_err(charger->dev,
             "VBUS is coming from a dedicated power supply.\n");
-        imx6_disable_charger_detector(data);
-        return -ENXIO;
+        //imx6_disable_charger_detector(data);
+        //return -ENXIO;
     }
 
     return 0;

Best regards
igor
-----------------------------------------------------------------------------------------------------------------------
Note: If this post answers your question, please click the Correct Answer button. Thank you!
-----------------------------------------------------------------------------------------------------------------------

[asmaa]

Hi,

igorpadykov‌,

Thank you for quick reply. The change is present my device tree that I have already posted above. My usbmisc_imx.c does not have the function that you have mentioned , but its in drivers/usb/phy/phy-mxs-usb.c. I made the change but its still not working.

Debugging further, it's giving me mxs_phy 20c9000.usbphy: vbus is not valid. My vbus is connected to pin T12 as shown in schematic below.

pin T12 is USB_OTG1_VBUS, but I dont find any pad definition for this pin in scripts/dtc/include-prefixes/arm/imx6ul-pinfunc.h. Is there any thing I am missing How should I configure this pin in device tree if there is no definition in imx6ul-pinfunc.h?

Looking forward to your response.

Thanks,

Asma

[igorpadykov]

Hi Asma

USB_OTG1_VBUS pad has not alternative functions, so there is no

its settings in dts file.

Best regards
igor

[asmaa]

Thank you,

But what can be the reason for getting "mxs_phy 20c9000.usbphy: vbus is not valid". I checked with the voltmeter volatge value is coming out to be 4.93 volt. 

I was reading charger detection algorithm. According to this , it first asks to Enable the vdd3p0 curret limiter

but I dont see it has been done anywhere in the source file drivers/usb/phy/phy-mxs-usb.c

can you please check if the driver is correct, has anyone verfied charger detection before?

[igorpadykov]

provided patch was tested internally and it works. You can

try to debug errors using AN4553 Using Open Source Debugging Tools for Linux on i.MX Processors
https://www.nxp.com/docs/en/application-note/AN4553.pdf

Best regards
igor