I put right at the end of the DTS file:
*&gpio0 {*
* adc_reset_pin {*
* gpio-hog;*
* gpios = <30 GPIO_ACTIVE_HIGH>;*
* output-low;*
* line-name = "ADC_RESET_PIN_POWER_ON";*
* };*
*};*
Than if this time is correct I will compile in DTB a test, right?
Il giorno giovedì 27 febbraio 2020 16:14:17 UTC+1, Fabrizio Borrello ha
scritto:
>
> Hi,
> I would like to set low the logic level on the P9_11 during the power on,
> so before the linux kernel has bees loaded.
> I do not have experince with tree device and boot loader so I am here to
> ask your help.
>
>> For what I was able to discover and collecting fragmentated informations,
>>> I have to modify the file
>>> "/boot/dtbs/4.14.71-bone-rt-r17/am335x-boneblack-uboot.dtb".
>>>
>> This file should be responsable for give the earlier informations during
> the power on start up of the system.
> I have decompiled this file and added:
>
> pinmux_P9_11_gpio_pd_pin {
> pinctrl-single,pins = <0x70 0x27>;
> phandle = <0x180>;
> };
> P9_11_pinmux {
> compatible = "bone-pinmux-helper";
> status = "okay";
> pinctrl-names = "default", "gpio", "gpio_pu", "gpio_pd", "gpio_input",
> "uart";
> pinctrl-0 = <0x17d>;
> pinctrl-1 = <0x17e>;
> pinctrl-2 = <0x17f>;
> pinctrl-3 = <0x180>;
> pinctrl-4 = <0x181>;
> pinctrl-5 = <0x182>;
> };
> P9_11 {
> gpio-name = "P9_11";
> gpio = <0x35 0x1e 0x0>;
> output;
> dir-changeable;
> };
>
> So, I guess, the system in power up will be able to set up and drive this
> PIN.
>
> Due to the lack of specific knowledge in this area now I am stuck, I don't
> know how to precede.
>
> Please help.
>
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