[Linux-stm32] [PATCH] net: stmmac: Support gpio high-level reset for devices requiring it

[lizhe]

Hi， Andrew

Thx,




i conducted an experiment, and no matter whether i configured it as 

GPIO_ACTIVE_LOW or GPIO_ACTIVE_HIGH in the dts, the resulting

GPIO pin state was 0, indicating a low level.







if (delays[2])

    msleep(DIV_ROUND_UP(DELAYS[2], 1000));




+ gpio_state = gpiod_get_value_can_sleep(reset_gpio);

+ pr_info("gpio_state: %d\n", gpio_state);





At 2025-07-09 01:34:07, "Andrew Lunn" <andrew at lunn.ch> wrote:
>On Tue, Jul 08, 2025 at 09:50:44AM -0700, Lizhe wrote:
>> some devices only reset when the GPIO is at a high level, but the
>> current function lacks support for such devices. add high-level
>> reset functionality to the function to support devices that require
>> high-level triggering for reset
>
>You can probably specify this in DT:
>
>reset-gpios = <&qe_pio_e 18 GPIO_ACTIVE_LOW>;
>
>The gpio core will then flip the meaning of
>
>gpiod_set_value_cansleep(reset_gpio, 1);
>
>such that a value of 1 will become low, 0 will become high.
>
>     Andrew
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