fix(gpio): removed unnecessary step when routing input signal to a pin

Author: songruo

components/esp_driver_gpio/README.md

@@ -20,7 +20,7 @@ When a peripheral driver does de-initialization, to de-configure the pin as the
 
 If the signal is routed through IO MUX to the pin, then only needs to call `gpio_iomux_input` to select the IO MUX function index and direct the signal to IO MUX. Input will be enabled for the IO internally.
 
-If the signal is routed through GPIO Matrix to the pin, then first call `gpio_func_sel` to let the pin use `PIN_FUNC_GPIO` function, follow by calling `gpio_input_enable` and `esp_rom_gpio_connect_in_signal` to enable the input and connect the signal to the pin.
+If the signal is routed through GPIO Matrix to the pin, then call `gpio_input_enable` and `esp_rom_gpio_connect_in_signal` to enable the input and connect the signal to the pin.
 
 When a peripheral driver does de-initialization, to de-configure the pin as the peripheral signal input, use `esp_rom_gpio_connect_in_signal` to connect the signal to CONST_ONE or CONST_ZERO, so that it is disconnected from the pin. It is not desired to call `gpio_input_disable`, because there might be other drivers still using this pin as an input.
 

components/esp_driver_parlio/src/parlio_rx.c

@@ -258,7 +258,6 @@ static esp_err_t s_parlio_rx_unit_set_gpio(parlio_rx_unit_handle_t rx_unit, cons
     if (config->clk_src == PARLIO_CLK_SRC_EXTERNAL) {
         ESP_RETURN_ON_FALSE(config->clk_in_gpio_num >= 0, ESP_ERR_INVALID_ARG, TAG, "clk_in_gpio_num must be set while the clock input from external");
         /* Connect the clock in signal to the GPIO matrix if it is set */
-        gpio_func_sel(config->clk_in_gpio_num, PIN_FUNC_GPIO);
         gpio_input_enable(config->clk_in_gpio_num);
 
         // deprecated, to be removed in in esp-idf v6.0
@@ -290,7 +289,6 @@ static esp_err_t s_parlio_rx_unit_set_gpio(parlio_rx_unit_handle_t rx_unit, cons
 
     /* Initialize the valid GPIO as input */
     if (config->valid_gpio_num >= 0) {
-        gpio_func_sel(config->valid_gpio_num, PIN_FUNC_GPIO);
         gpio_input_enable(config->valid_gpio_num);
 
         // deprecated, to be removed in in esp-idf v6.0
@@ -305,7 +303,6 @@ static esp_err_t s_parlio_rx_unit_set_gpio(parlio_rx_unit_handle_t rx_unit, cons
     for (int i = 0; i < config->data_width; i++) {
         /* Loop the data_gpio_nums to connect data and valid signals via GPIO matrix */
         if (config->data_gpio_nums[i] >= 0) {
-            gpio_func_sel(config->data_gpio_nums[i], PIN_FUNC_GPIO);
             gpio_input_enable(config->data_gpio_nums[i]);
 
             // deprecated, to be removed in in esp-idf v6.0

components/esp_driver_parlio/src/parlio_tx.c

@@ -183,7 +183,6 @@ static esp_err_t parlio_tx_unit_configure_gpio(parlio_tx_unit_t *tx_unit, const
                                         parlio_periph_signals.groups[group_id].tx_units[unit_id].clk_out_sig, false, false);
     }
     if (config->clk_in_gpio_num >= 0) {
-        gpio_func_sel(config->clk_in_gpio_num, PIN_FUNC_GPIO);
         gpio_input_enable(config->clk_in_gpio_num);
 
         // deprecated, to be removed in in esp-idf v6.0

components/esp_driver_uart/src/uart.c

@@ -768,7 +768,6 @@ esp_err_t uart_set_pin(uart_port_t uart_num, int tx_io_num, int rx_io_num, int r
     if (rx_io_num >= 0 && (tx_rx_same_io || !uart_try_set_iomux_pin(uart_num, rx_io_num, SOC_UART_RX_PIN_IDX))) {
         io_reserve_mask &= ~BIT64(rx_io_num); // input IO via GPIO matrix does not need to be reserved
         if (uart_num < SOC_UART_HP_NUM) {
-            gpio_func_sel(rx_io_num, PIN_FUNC_GPIO);
             gpio_input_enable(rx_io_num);
             esp_rom_gpio_connect_in_signal(rx_io_num, UART_PERIPH_SIGNAL(uart_num, SOC_UART_RX_PIN_IDX), 0);
         }
@@ -803,7 +802,6 @@ esp_err_t uart_set_pin(uart_port_t uart_num, int tx_io_num, int rx_io_num, int r
     if (cts_io_num >= 0  && !uart_try_set_iomux_pin(uart_num, cts_io_num, SOC_UART_CTS_PIN_IDX)) {
         io_reserve_mask &= ~BIT64(cts_io_num); // input IO via GPIO matrix does not need to be reserved
         if (uart_num < SOC_UART_HP_NUM) {
-            gpio_func_sel(cts_io_num, PIN_FUNC_GPIO);
             gpio_pullup_en(cts_io_num);
             gpio_input_enable(cts_io_num);
             esp_rom_gpio_connect_in_signal(cts_io_num, UART_PERIPH_SIGNAL(uart_num, SOC_UART_CTS_PIN_IDX), 0);

components/esp_driver_uart/test_apps/uart/main/test_uart.c

@@ -10,6 +10,7 @@
 #include "driver/uart.h"
 #include "esp_log.h"
 #include "esp_rom_gpio.h"
+#include "esp_private/gpio.h"
 #if SOC_LP_GPIO_MATRIX_SUPPORTED
 #include "driver/lp_io.h"
 #include "driver/rtc_io.h"
@@ -463,6 +464,7 @@ TEST_CASE("uart int state restored after flush", "[uart]")
     /* Make sure UART's TX signal is connected to RX pin
      * This creates a loop that lets us receive anything we send on the UART */
     if (uart_num < SOC_UART_HP_NUM) {
+        gpio_func_sel(uart_rx, PIN_FUNC_GPIO);
         esp_rom_gpio_connect_out_signal(uart_rx, uart_tx_signal, false, false);
 #if SOC_UART_LP_NUM > 0
     } else {