PROCESSOR-SDK-AM65X: U-boot GPIO Configuration

Hi Md Shadab,

I would suggest you to add main_gpio1 node into file:

u-boot/arch/arm/dts/k3-am65-main.dtsi

&cbass_main {

.....

main_i2c3: i2c@2030000 {

....

};

main_gpio1: main_gpio1@601000 {
        compatible = "ti,k2g-gpio", "ti,keystone-gpio";
        reg = <0x0 0x601000 0x0 0x100>;
        gpio-controller;
        #gpio-cells = <2>;
        ti,ngpio = <90>;
        ti,davinci-gpio-unbanked = <0>;
        clocks = <&k3_clks 58 0>;
        clock-names = "gpio";
    };

Then for pinmux, you can add main_gpio1 pinmux in below file:

u-boot/arch/arm/dts/k3-am654-base-board.dts

&main_pmx1 {

main_i2c1_pins_default: main-i2c1-pins-default {
        pinctrl-single,pins = <
            AM65X_IOPAD(0x0008, PIN_INPUT, 0) /* (B21) I2C1_SCL */
            AM65X_IOPAD(0x000c, PIN_INPUT, 0) /* (E21) I2C1_SDA */
        >;
    };

main_gpio1_pins_default: main-gpio1-pins-default {
        pinctrl-single,pins = <
            AM65X_IOPAD(0x0018, PIN_OUTPUT_PULLUP, 7) /* (B22) GPIO1_88 */
        >;
    };

&main_i2c2 {
    pinctrl-names = "default";
    pinctrl-0 = <&main_i2c2_pins_default>;
    clock-frequency = <400000>;
};

&main_gpio1 {
     status = "okay";
     pinctrl-names = "default";
     pinctrl-0 = <&main_gpio1_pins_default>;
};

Then you need to check if any warning/errors (related to gpio1) are generated during building and loading u-boot. Then you can check SOC_PADCONFIG_192 register with md command in u-boot prompt.

Regards,
Pavel

Thanks for the reply Pavel,

I tried same what you have mentioned in your reply , but still  getting same result (0.33V).

Regards,

Shadab

Shadab,

From what I understand, you observe low level on that pin B22, while you need to setup high level there.

Could you please provide what value you have in SOC_PADCONFIG_192 register at u-boot stage, before and after the code update?

Regards,
Pavel

Hi Pavel,

I tried md command in u-boot prompt please find screenshot.

fig 1: Before Modification

fig 2: After modification

fig 3 : I gave the register address using md command

Based on above observation please help me out.

Regards,

Shadab

Hi Shadab,

Do you use AM65x PSDK Linux? Which version? latest is 6.01 and is available at below link:

http://software-dl.ti.com/processor-sdk-linux/esd/AM65X/latest/index_FDS.html

The correct u-boot command is:

=> md 0x0011C300 1
0011c300: 08210007

The default u-boot code base is giving the reset value: 0x08210007

When you update u-boot DTS files, make sure you are building new u-boot images successful. Follow below user guide:

http://software-dl.ti.com/processor-sdk-linux/esd/docs/latest/linux/Foundational_Components_U-Boot.html#u-boot-for-am65x-family-of-socs

Regards,
Pavel

Thanks for the reply Pavel,

I am using PROCESSOR-SDK-LINUX-AM65X  06_00_00_07.

Yes, I make sure that for every update into U-boot DTS files  i am building new image and copying new generated image into SD card boot partition.

After copying U-boot images i run the  md command on U-boot prompt as below but still i didn't observe any changes.

=>  md 0x0011C300 1
0011c300: 08210007  

Regards,

Shadab

Shadab,

Quick fix can be to update this register directly:

=> md 0x0011C300 1
0011c300: 08210007
=> mw 0x0011C300 08220007 1
=> md 0x0011C300 1
0011c300: 08220007

Check if this quick fix is working for you.

Regards,
Pavel

Thank you so much Pavel, I am able to observe 3.3V on the GPIO1_88 pin.

Now, can you suggest me how to make it default , that means when we reboot the EVM board  , As soon as  boot process reached in u-boot stage this GPIO1_88 pin should get high(3.3V).

Regards,

Shadab

Shadab,

There is some problem with main_pinmux0/1 in k3-am654-base-board.dts, which currently I can not identify.

What I can suggest you at this stage, is to write the value of  0x08220007 in SOC_PADCONFIG_192/0x0011C300 register directly, with writel() command. You can use this command in below file:

u-boot/arch/arm/mach-k3/am6_init.c

You can take for example how NAVSS0_NBSS registers or CTRLMMR_LOCK_KICK registers are written.

Regards,
Pavel

Thank you Andreas, for the reasonable answer.

Now , can you help me how to use those APIs that you have mentioned  in your reply in 2nd method and from which file need to call those APIs.

Regards,

Shadab 

Shadab,

Md Shadab said:

Now , can you help me how to use those APIs that you have mentioned  in your reply in 2nd method and from which file need to call those APIs.

I would suggest you to open new e2e thread for you new question, as this thread is already marked as resolved.

Regards,
Pavel