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input: gt911: fix reset control polarity

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This chip uses an active low reset, so the correct behavior here is to
define the pin as ACTIVE_LOW, using GPIO_OUTPUT_ACTIVE to assert the
reset and set to 0 to deassert.

Signed-off-by: Fabio Baltieri <fabiobaltieri@google.com>
This commit is contained in:
Fabio Baltieri 2023-11-03 17:35:19 +00:00 • committed by Fabio Baltieri
commit 0e3d0e9b15
3 changed files with 5 additions and 5 deletions
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2
boards/shields/rk055hdmipi4m/rk055hdmipi4m.overlay
View file

@ -30,7 +30,7 @@
compatible = "goodix,gt911";
reg = <0x5d>;
irq-gpios = <&nxp_mipi_connector 29 GPIO_ACTIVE_HIGH>;
reset-gpios = <&nxp_mipi_connector 28 GPIO_ACTIVE_HIGH>;
reset-gpios = <&nxp_mipi_connector 28 GPIO_ACTIVE_LOW>;
};
};

2
boards/shields/rk055hdmipi4ma0/rk055hdmipi4ma0.overlay
View file

@ -30,7 +30,7 @@
compatible = "goodix,gt911";
reg = <0x5d>;
irq-gpios = <&nxp_mipi_connector 29 GPIO_ACTIVE_HIGH>;
reset-gpios = <&nxp_mipi_connector 28 GPIO_ACTIVE_HIGH>;
reset-gpios = <&nxp_mipi_connector 28 GPIO_ACTIVE_LOW>;
};
};

6
drivers/input/input_gt911.c
View file

@ -230,7 +230,7 @@ static int gt911_init(const struct device *dev)
return -ENODEV;
}
r = gpio_pin_configure_dt(&config->rst_gpio, GPIO_OUTPUT_INACTIVE);
r = gpio_pin_configure_dt(&config->rst_gpio, GPIO_OUTPUT_ACTIVE);
if (r < 0) {
LOG_ERR("Could not configure reset GPIO pin");
return r;
@ -253,10 +253,10 @@ static int gt911_init(const struct device *dev)
/* Delay at least 10 ms after power on before we configure gt911 */
k_sleep(K_MSEC(20));
/* reset the device and confgiure the addr mode0 */
gpio_pin_set_dt(&config->rst_gpio, 0);
gpio_pin_set_dt(&config->rst_gpio, 1);
/* hold down at least 1us, 1ms here */
k_sleep(K_MSEC(1));
gpio_pin_set_dt(&config->rst_gpio, 1);
gpio_pin_set_dt(&config->rst_gpio, 0);
/* hold down at least 5ms. This is the point the INT pin must be low. */
k_sleep(K_MSEC(5));
/* hold down 50ms to make sure the address available */