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Title: GPIO manual control [Print This Page]

Author: valeriy.simakov Time: 5/3/2022 01:24
Title: GPIO manual control
Last edited by valeriy.simakov In 5/4/2022 11:33 Editor

Hi !

I'm trying to control pins which are IC's reset pins.
LAN7800_1    RSTLAN             GPIO4_B4 (pin 265) gpio140
LAN7800_2    RSTLAN             GPIO4_C2 (pin 235) gpio146
FT4232             RSTFT4232H_1 GPIO4_B2 (pin 314)    gpio138
FT4232          RSTFT4232H_2    GPIO4_B3 (pin 313)    gpio139

I used instruction from wiki ( https://wiki.t-firefly.com/en/ROC-RK3568-PC/driver_gpio.html)
So I got this (via $cat /sys/kernel/debug/gpio):
gpiochip4: GPIOs 128-159, parent: platform/fe770000.gpio, gpio4:
gpio-138 (                   |sysfs             ) out hi
gpio-139 (                   |sysfs             ) out hi
gpio-140 (                   |sysfs             ) out hi
gpio-146 (                   |sysfs             ) out hi

But it doesn't take any effect. So maybe I need some additional magic

Could you please help me?

linux: ubuntu, rk3568, image was generated from SDK.

Author: 时间的蝴蝶 Time: 5/5/2022 15:26
The control method is as described in WIKI. Is the IO level unchanged? And is IO multiplexed?

```
When GPIO4_D5 pin is not reused by other peripherals, we can export this pin to use

:/ # ls /sys/class/gpio/
export    gpiochip128  gpiochip32 gpiochip64  unexport
gpiochip0  gpiochip255  gpiochip500  gpiochip96
:/ # echo 157 > /sys/class/gpio/export
:/ # ls /sys/class/gpio/
export gpiochip0 gpiochip255  gpiochip500  gpiochip96
gpio157  gpiochip128  gpiochip32 gpiochip64 unexport
:/ # ls /sys/class/gpio/gpio157
active_low  device  direction  edge  power  subsystem  uevent  value
:/ # cat /sys/class/gpio/gpio157/direction
in
:/ # cat /sys/class/gpio/gpio157/value
0
```

Author: valeriy.simakov Time: 5/8/2022 03:05
Last edited by valeriy.simakov In 5/8/2022 03:10 Editor

Actually, yes, I had found that one pin used by i2c bus, I disabled that bus and my pin config cause on pin front.

How can I check that the IO level is unchanged and IO is multiplexed?

Author: 时间的蝴蝶 Time: 5/9/2022 14:28

valeriy.simakov Posted at 5/8/2022 03:05
Actually, yes, I had found that one pin used by i2c bus, I disabled that bus and my pin config cause ...

Check the IO level status through commands or measure the actual value with a multimeter. `cat /sys/kernel/debug/gpio`

Check if IO is multiplexed, `cat /sys/kernel/debug/pinctrl/pinctrl-rockchip-pinctrl/pinmux-pins`

Author: valeriy.simakov Time: 5/10/2022 21:49
Last edited by valeriy.simakov In 5/11/2022 16:25 Editor

时间的蝴蝶 Posted at 5/9/2022 14:28
Check the IO level status through commands or measure the actual value with a multimeter. `cat /sy ...

I added my pins to dts and checked:

cat /sys/kernel/debug/gpio:
gpiochip4: GPIOs 128-159, parent: platform/fe770000.gpio, gpio4:
gpio-138 (                   |RSTFT4232H_1       ) out hi
gpio-139 (                   |RSTFT4232H_2       ) out hi
gpio-140 (                   |lan7800_1          ) out hi
gpio-141 (                   |RSTUSB2251       ) out hi
gpio-146 (                   |lan7800_2          ) out hi
gpio-154 (                   |lan_hub          ) out hi

cat /sys/kernel/debug/pinctrl/pinctrl-rockchip-pinctrl/pinmux-pins:
pin 138 (gpio4-10): (MUX UNCLAIMED) gpio4:138
pin 139 (gpio4-11): (MUX UNCLAIMED) gpio4:139
pin 140 (gpio4-12): (MUX UNCLAIMED) gpio4:140
pin 141 (gpio4-13): (MUX UNCLAIMED) gpio4:141
pin 146 (gpio4-18): (MUX UNCLAIMED) gpio4:146
pin 154 (gpio4-26): (MUX UNCLAIMED) gpio4:154

But on the board they are 1.2v, only lan7800_2 is 3.4v

Author: valeriy.simakov Time: 5/11/2022 00:53
Last edited by valeriy.simakov In 5/11/2022 16:09 Editor

I'm new to Linux, maybe I made mistakes...

// New pins:
RSTUSB2251 GPIO4_B5 gpio141
lan_hub          GPIO4_D2 gpio154

// My dts modifications:
(rk3568-firefly-roc-pc.dtsi)
/ {
...

firefly_leds: leds {
...

            lan7800_1_reset: lan7800_1 {
                              default-state = "on";
                              gpios = <&gpio4 RK_PB4 GPIO_ACTIVE_HIGH>;
                              pinctrl-names = "gpio";
                              pinctrl-1 = <&lan7800_1>;
            };

            lan7800_2_reset: lan7800_2 {
                              default-state = "on";
                              gpios = <&gpio4 RK_PC2 GPIO_ACTIVE_HIGH>;
                              pinctrl-names = "gpio";
                              pinctrl-1 = <&lan7800_2>;
            };

            lan_hub_reset: lan_hub {
                              default-state = "on";
                              gpios = <&gpio4 RK_PD2 GPIO_ACTIVE_HIGH>;
                              pinctrl-names = "gpio";
                              pinctrl-1 = <&lan_hub>;
            };

            RSTFT4232H_1_reset: RSTFT4232H_1 {
                     default-state = "on";
                     gpios = <&gpio4 RK_PB2 GPIO_ACTIVE_HIGH>;
                     pinctrl-names = "gpio";
                     pinctrl-1 = <&RSTFT4232H_1>;
            };

            RSTFT4232H_2_reset: RSTFT4232H_2 {
                     default-state = "on";
                     gpios = <&gpio4 RK_PB3 GPIO_ACTIVE_HIGH>;
                     pinctrl-names = "gpio";
                     pinctrl-1 = <&RSTFT4232H_2>;
            };

            RSTUSB2251_reset: RSTUSB2251 {
                     default-state = "on";
                     gpios = <&gpio4 RK_PB5 GPIO_ACTIVE_HIGH>;
                     pinctrl-names = "gpio";
                     pinctrl-1 = <&RSTUSB2251>;
            };
};
...
};
&pinctrl {
...
      leds {
...
            lan7800_1: lan7800_1 {
                     rockchip,pins = <4 RK_PB4 RK_FUNC_GPIO &pcfg_pull_up>;
            };

            lan7800_2: lan7800_2 {
                     rockchip,pins = <4 RK_PC2 RK_FUNC_GPIO &pcfg_pull_up>;
            };

            lan_hub: lan_hub {
                     rockchip,pins = <4 RK_PD2 RK_FUNC_GPIO &pcfg_pull_up>;
            };

            RSTFT4232H_1: RSTFT4232H_1 {
                     rockchip,pins = <4 RK_PB2 RK_FUNC_GPIO &pcfg_pull_up>;
            };

            RSTFT4232H_2: RSTFT4232H_2 {
                     rockchip,pins = <4 RK_PB3 RK_FUNC_GPIO &pcfg_pull_up>;
            };

            RSTUSB2251: RSTUSB2251 {
                     rockchip,pins = <4 RK_PB5 RK_FUNC_GPIO &pcfg_pull_up>;
            };
      };
};

rk3568-firefly-roc-pc.zip (1.69 KB, Down times: 2)

Author: 时间的蝴蝶 Time: 5/11/2022 16:16

valeriy.simakov Posted at 5/10/2022 21:49
I added my pins to dts and checked:

cat /sys/kernel/debug/gpio:

It seems that the control of the IO port is normal.
Maybe you should check the effect of the peripheral circuit on the voltage.

Author: valeriy.simakov Time: 5/11/2022 16:30

时间的蝴蝶 Posted at 5/11/2022 16:16
It seems that the control of the IO port is normal.
Maybe you should check the effect of the peri ...

"But on the board they are 1.2v, only lan7800_2 is 3.4v"

Maybe I can adjust the voltage, because it is not the same for different pins? It's strange ;)

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