About "Power Tree Changes" for L4T kernel customization

Dear Sirs

I have a question about the contents of “Power Tree Changes” in “PLATFORM_ADAPTATION_AND_BRING-UP_GUIDE (DA_08477-001) _Tegra Linux Driver Package for Jetson TX2”.

There is a description as follows.
"The Jetson P2597 baseboard has a GPIO expander. Some of the pins on the GPIO expander are used as a GPIO regulator.
One such usage is to enable vbus-2-supply which is powered using vdd_usb2_5v GPIO regulator. "

Where does the “vdd_usb2_5v GPIO regulator” shown here specifically refer to the P2597’s circuit diagram?

If anyone can understand it, I would appreciate it if you could teach me.

Best regards

hello ToruUno,

you’ll see following by checking the device tree sources. it’s pin to provide 5v for your usage.
for example,

                vdd_usb2_5v: regulator@17 {
                        compatible = "regulator-fixed-sync";
                        reg = <17>;
                        regulator-name = "vdd-usb2-5v";
                        regulator-min-microvolt = <5000000>;
                        regulator-max-microvolt = <5000000>;
                        gpio = <&gpio_i2c_0_74 0 0>;

Hello JerryChang

Thank you for your reply.

Is it correct to interpret that “vdd_usb2_5v” in the device tree corresponds to “GPIO_EXP_P17_3V3” connected to U29 (TCA9539, I2C device address 0x74) and Pin20 on Page21of34 of the P2597 circuit diagram?



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