arch/risc-v: Add dedicated GPIO support for esp32[-s2|-s3|-c3|-c6|-h2]

Documentation/platforms/risc-v/esp32c3/index.rst

@@ -350,7 +350,7 @@ CAN/TWAI     Yes
 DMA          No
 DS           No
 eFuse        Yes    Also virtual mode supported
-GPIO         Yes
+GPIO         Yes    Dedicated GPIO supported
 HMAC         No
 I2C          Yes    Master and Slave mode supported
 I2S          Yes

Documentation/platforms/risc-v/esp32c6/boards/esp32c6-devkitc/index.rst

@@ -183,6 +183,42 @@ We can use the interrupt pin to send a signal when the interrupt fires::
 The pin is configured as a rising edge interrupt, so after issuing the
 above command, connect it to 3.3V.
 
+To use dedicated gpio for controling multiple gpio pin at the same time
+or having better response time, you need to enable
+`CONFIG_ESPRESSIF_DEDICATED_GPIO` option. Dedicated GPIO is suitable
+for faster response times required applications like simulate serial/parallel
+interfaces in a bit-banging way.
+After this option enabled GPIO4 and GPIO5 pins are ready to used as dedicated GPIO pins
+as input/output mode. These pins are for example, you can use any pin up to 8 pins for
+input and 8 pins for output for dedicated gpio.
+To write and read data from dedicated gpio, you need to use
+`GPIOC_BUNDLE_WR` and `GPIOC_BUNDLE_RD` commands.
+
+The following snippet demonstrates how to read/write to dedicated GPIO pins:
+
+.. code-block:: C
+
+    int fd; = open("/dev/gpio3", O_RDWR);
+    int rd_val = 0;
+    struct gpio_bundle_wr_arg_s wr_arg;
+
+    wr_arg.mask = 0xffff;
+    wr_arg.value = 0;
+    while(1)
+      {
+        ioctl(fd, GPIOC_BUNDLE_WR, &wr_arg);
+        if (toggle == 0)
+          {
+            wr_arg.value = 3;
+          }
+        else
+          {
+            wr_arg.value = 0;
+          }
+        ioctl(fd, GPIOC_BUNDLE_RD, &rd_val);
+        printf("rd_val: %d", rd_val);
+      }
+
 i2c
 ---
 

Documentation/platforms/risc-v/esp32c6/boards/esp32c6-devkitm/index.rst

@@ -167,6 +167,42 @@ We can use the interrupt pin to send a signal when the interrupt fires::
 The pin is configured as a rising edge interrupt, so after issuing the
 above command, connect it to 3.3V.
 
+To use dedicated gpio for controling multiple gpio pin at the same time
+or having better response time, you need to enable
+`CONFIG_ESPRESSIF_DEDICATED_GPIO` option. Dedicated GPIO is suitable
+for faster response times required applications like simulate serial/parallel
+interfaces in a bit-banging way.
+After this option enabled GPIO4 and GPIO5 pins are ready to used as dedicated GPIO pins
+as input/output mode. These pins are for example, you can use any pin up to 8 pins for
+input and 8 pins for output for dedicated gpio.
+To write and read data from dedicated gpio, you need to use
+`GPIOC_BUNDLE_WR` and `GPIOC_BUNDLE_RD` commands.
+
+The following snippet demonstrates how to read/write to dedicated GPIO pins:
+
+.. code-block:: C
+
+    int fd; = open("/dev/gpio3", O_RDWR);
+    int rd_val = 0;
+    struct gpio_bundle_wr_arg_s wr_arg;
+
+    wr_arg.mask = 0xffff;
+    wr_arg.value = 0;
+    while(1)
+      {
+        ioctl(fd, GPIOC_BUNDLE_WR, &wr_arg);
+        if (toggle == 0)
+          {
+            wr_arg.value = 3;
+          }
+        else
+          {
+            wr_arg.value = 0;
+          }
+        ioctl(fd, GPIOC_BUNDLE_RD, &rd_val);
+        printf("rd_val: %d", rd_val);
+      }
+
 i2c
 ---
 

Documentation/platforms/risc-v/esp32c6/index.rst

@@ -338,7 +338,7 @@ CAN/TWAI         Yes
 DMA              Yes
 ECC              No
 eFuse            Yes
-GPIO             Yes
+GPIO             Yes     Dedicated GPIO supported
 HMAC             No
 I2C              Yes     Master and Slave mode supported
 I2S              Yes

Documentation/platforms/risc-v/esp32h2/boards/esp32h2-devkit/index.rst

@@ -166,6 +166,42 @@ We can use the interrupt pin to send a signal when the interrupt fires::
 The pin is configured as a rising edge interrupt, so after issuing the
 above command, connect it to 3.3V.
 
+To use dedicated gpio for controling multiple gpio pin at the same time
+or having better response time, you need to enable
+`CONFIG_ESPRESSIF_DEDICATED_GPIO` option. Dedicated GPIO is suitable
+for faster response times required applications like simulate serial/parallel
+interfaces in a bit-banging way.
+After this option enabled GPIO4 and GPIO5 pins are ready to used as dedicated GPIO pins
+as input/output mode. These pins are for example, you can use any pin up to 8 pins for
+input and 8 pins for output for dedicated gpio.
+To write and read data from dedicated gpio, you need to use
+`GPIOC_BUNDLE_WR` and `GPIOC_BUNDLE_RD` commands.
+
+The following snippet demonstrates how to read/write to dedicated GPIO pins:
+
+.. code-block:: C
+
+    int fd; = open("/dev/gpio3", O_RDWR);
+    int rd_val = 0;
+    struct gpio_bundle_wr_arg_s wr_arg;
+
+    wr_arg.mask = 0xffff;
+    wr_arg.value = 0;
+    while(1)
+      {
+        ioctl(fd, GPIOC_BUNDLE_WR, &wr_arg);
+        if (toggle == 0)
+          {
+            wr_arg.value = 3;
+          }
+        else
+          {
+            wr_arg.value = 0;
+          }
+        ioctl(fd, GPIOC_BUNDLE_RD, &rd_val);
+        printf("rd_val: %d", rd_val);
+      }
+
 i2c
 ---
 

Documentation/platforms/risc-v/esp32h2/index.rst

@@ -340,7 +340,7 @@ DMA              Yes
 DS               No
 ECC              No
 eFuse            Yes
-GPIO             Yes
+GPIO             Yes    Dedicated GPIO supported
 HMAC             No
 I2C              Yes    Master and Slave mode supported
 I2S              Yes

Documentation/platforms/xtensa/esp32s2/boards/esp32s2-saola-1/index.rst

@@ -201,6 +201,36 @@ At the nsh, we can turn the GPIO output on and off with the following::
     nsh> gpio -o 1 /dev/gpio0
     nsh> gpio -o 0 /dev/gpio0
 
+To use dedicated gpio, you need to enable `CONFIG_ESPRESSIF_DEDICATED_GPIO` option.
+After this option enabled GPIO6 and GPIO5 pins are ready to used as dedicated GPIO pins
+as input/output mode. To write and read data from dedicated gpio, you need to use
+`GPIOC_BUNDLE_WR` and `GPIOC_BUNDLE_RD` commands.
+
+The following snippet demonstrates how to read/write to dedicated GPIO pins:
+
+.. code-block:: C
+
+    int fd; = open("/dev/gpio3", O_RDWR);
+    int rd_val = 0;
+    struct gpio_bundle_wr_arg_s wr_arg;
+
+    wr_arg.mask = 0xffff;
+    wr_arg.value = 0;
+    while(1)
+      {
+        ioctl(fd, GPIOC_BUNDLE_WR, &wr_arg);
+        if (toggle == 0)
+          {
+            wr_arg.value = 3;
+          }
+        else
+          {
+            wr_arg.value = 0;
+          }
+        ioctl(fd, GPIOC_BUNDLE_RD, &rd_val);
+        printf("rd_val: %d", rd_val);
+      }
+
 i2c
 ---
 

Documentation/platforms/xtensa/esp32s2/index.rst

@@ -382,7 +382,7 @@ CAN/TWAI     Yes
 DAC          No
 DMA          Yes
 eFuse        Yes
-GPIO         Yes
+GPIO         Yes    Dedicated GPIO supported
 I2C          Yes    Master and Slave mode supported
 I2S          Yes
 LED/PWM      Yes

Documentation/platforms/xtensa/esp32s3/boards/esp32s3-devkit/index.rst

@@ -234,6 +234,42 @@ interrupt fires::
 The pin is configured to trigger an interrupt on the rising edge, so after
 issuing the above command, connect it to 3.3V.
 
+To use dedicated gpio for controling multiple gpio pin at the same time
+or having better response time, you need to enable
+`CONFIG_ESPRESSIF_DEDICATED_GPIO` option. Dedicated GPIO is suitable
+for faster response times required applications like simulate serial/parallel
+interfaces in a bit-banging way.
+After this option enabled GPIO4 and GPIO5 pins are ready to used as dedicated GPIO pins
+as input/output mode. These pins are for example, you can use any pin up to 8 pins for
+input and 8 pins for output for dedicated gpio.
+To write and read data from dedicated gpio, you need to use
+`GPIOC_BUNDLE_WR` and `GPIOC_BUNDLE_RD` commands.
+
+The following snippet demonstrates how to read/write to dedicated GPIO pins:
+
+.. code-block:: C
+
+    int fd; = open("/dev/gpio3", O_RDWR);
+    int rd_val = 0;
+    struct gpio_bundle_wr_arg_s wr_arg;
+
+    wr_arg.mask = 0xffff;
+    wr_arg.value = 0;
+    while(1)
+      {
+        ioctl(fd, GPIOC_BUNDLE_WR, &wr_arg);
+        if (toggle == 0)
+          {
+            wr_arg.value = 3;
+          }
+        else
+          {
+            wr_arg.value = 0;
+          }
+        ioctl(fd, GPIOC_BUNDLE_RD, &rd_val);
+        printf("rd_val: %d", rd_val);
+      }
+
 i2c
 ---
 

Documentation/platforms/xtensa/esp32s3/index.rst

@@ -415,7 +415,7 @@ Camera       No
 CAN/TWAI     Yes
 DMA          Yes
 eFuse        Yes
-GPIO         Yes
+GPIO         Yes   Dedicated GPIO supported
 I2C          Yes   Master and Slave mode supported
 I2S          Yes
 LCD          No

arch/risc-v/src/common/espressif/Kconfig

@@ -303,6 +303,12 @@ config ESPRESSIF_USBSERIAL
 	select OTHER_UART_SERIALDRIVER
 	select ARCH_HAVE_SERIAL_TERMIOS
 
+config ESPRESSIF_DEDICATED_GPIO
+	bool "Dedicated GPIO"
+	default n
+	---help---
+		Enable dedicated GPIO support for faster response time
+
 config ESPRESSIF_GPIO_IRQ
 	bool "GPIO pin interrupts"
 	default n

arch/risc-v/src/common/espressif/Make.defs

@@ -103,6 +103,10 @@ ifeq ($(CONFIG_ESP_RMT),y)
 	endif
 endif
 
+ifeq ($(CONFIG_ESPRESSIF_DEDICATED_GPIO),y)
+	CHIP_CSRCS += esp_dedic_gpio.c
+endif
+
 ifeq ($(CONFIG_ESPRESSIF_TEMP),y)
 	CHIP_CSRCS += esp_temperature_sensor.c
 endif