boards/esp32p4-tab5: add the ILI9881C and GT911 hardware variant

The Tab5 ships in two hardware variants and the board supported only
one of them.  The earlier units carry an ILI9881C panel and a GT911
touch controller, the later ones a ST7121/ST7123 panel and a ST7123
touch controller, and the two always come as a pair.  On an earlier
unit the panel stays lit but black, and the touch bring-up fails with
"failed to register ST7123: -5".

Add the ILI9881C initialization table, taken from the Espressif BSP,
along with the display timings it needs, which differ from the ST7123
ones in the DPI clock (60 MHz instead of 70 MHz) and in every porch.
The panel identification lives on command page 1 and is read and
logged during bring-up, so the boot log says which panel answered.

Add the GT911 to the touch controller choice.  These units have a
pull-up to 3V3 on the touch interrupt line that keeps the controller
from scanning, so the line is driven low instead of being used as an
interrupt, and contacts are picked up when the device is read.  The
controller identification is logged the same way.

Split esp32p4_touch.c into one file per controller, which is how the
panels are already handled, and document both variants together with
the I2C scan that tells which one is fitted.  The defaults are
unchanged, so an existing configuration still selects the ST7121
panel and the ST7123 touch controller.

Assisted-by: Claude:opus-5
Signed-off-by: Jorge Guzman <jorge.gzm@gmail.com>

Author: JorgeGzm

Documentation/platforms/risc-v/esp32p4/boards/esp32p4-tab5/index.rst

@@ -140,6 +140,45 @@ The Tab5 ships with ESP32-P4 **revision v1.0**.  The ``nsh`` defconfig sets
 ``CONFIG_ESP32P4_SELECTS_REV_LESS_V3=y`` accordingly.  A harmless boot warning
 is printed because the upstream default targets rev >= 3.0.
 
+Display panel and touch controller
+==================================
+
+The Tab5 ships in two hardware variants, and they always come as a pair:
+
+======================= ============================ ==========================
+Variant                 Panel                        Touch controller
+======================= ============================ ==========================
+Earlier units           ILI9881C                     GT911 (I2C ``0x14``)
+Later units             ST7121 / ST7123              ST7123 (I2C ``0x55``)
+======================= ============================ ==========================
+
+The panels need different initialization tables and different display
+timings, so the wrong selection leaves the panel lit but black, and the wrong
+touch selection fails the bring-up with::
+
+    ERROR: failed to register ST7123: -5
+
+Identify the board by scanning I2C0 with the ``nsh`` configuration. The
+address that answers tells which variant is fitted, and therefore which
+panel to select as well::
+
+    nsh> i2c dev -b 0 0x03 0x77
+
+Select the panel with ``ESP32P4_TAB5_LCD_ST7121`` (the default),
+``ESP32P4_TAB5_LCD_ST7123`` or ``ESP32P4_TAB5_LCD_ILI9881C``, and the touch
+controller with ``ESP32P4_TAB5_TOUCH_ST7123`` (the default) or
+``ESP32P4_TAB5_TOUCH_GT911``, both under the board menu.
+
+Both panels report their identification at boot, which confirms the
+selection. The ILI9881C answers ``98 81`` in the first two ID registers::
+
+    ili9881c: panel ID 98 81 5c
+    gt911: product "911" (39 31 31 00) fw 1060
+
+On the GT911 units the touch interrupt line has a pull-up to 3V3 that keeps
+the controller from scanning, so the board drives it low instead of using it
+as an interrupt. Contacts are picked up when the device is read.
+
 Configurations
 ==============
 
@@ -165,7 +204,6 @@ lvgl_demo
 ---------
 
 LVGL demo configuration with touch support.
-Requires the ST7123 touch controller version.
 
 .. note::
    This configuration redirects the console to UART0 instead of the USB Serial/JTAG port
@@ -181,11 +219,12 @@ lvgl_term
 ---------
 
 LVGL terminal configuration with touch support.
-Requires the ST7123 touch controller version.
 
 .. note::
-   This configuration redirects the console to UART0 instead of the USB Serial/JTAG port
-   and sets a custom entry point to open LVGL terminal on screen.
+   This configuration starts the LVGL terminal on the panel as its entry
+   point, and it runs its own NSH on a pseudo-terminal. The console is kept
+   on the USB Serial/JTAG port (exposed as ``ttyACM`` on the host), which
+   carries the system log.
 
 .. code-block:: console
 

boards/risc-v/esp32p4/esp32p4-tab5/Kconfig

@@ -96,15 +96,53 @@ config ESP32P4_TAB5_LCD_ST7123
 	---help---
 		Use the ST7123 initialization table and display timings.
 
+config ESP32P4_TAB5_LCD_ILI9881C
+	bool "ILI9881C"
+	---help---
+		Use the ILI9881C initialization table and display timings.  This is
+		the panel fitted to the earlier Tab5 units, the ones that also carry
+		the GT911 touch controller.
+
 endchoice
 
 config ESP32P4_TAB5_TOUCHSCREEN
 	bool "Touch Screen Controller"
 	default n
 	select INPUT
-	select INPUT_ST7123
 	select ESP32P4_TAB5_HMI_POWER
 	---help---
-		Initialize the ST7123 touch screen controller.
+		Initialize the touch screen controller.
+
+if ESP32P4_TAB5_TOUCHSCREEN
+
+choice
+	prompt "Touch screen controller"
+	default ESP32P4_TAB5_TOUCH_ST7123
+
+config ESP32P4_TAB5_TOUCH_ST7123
+	bool "ST7123"
+	select INPUT_ST7123
+	---help---
+		Sitronix ST7123, fitted to the Tab5 units that ship with the
+		ST7121/ST7123 panel.  Answers on I2C address 0x55.
+
+config ESP32P4_TAB5_TOUCH_GT911
+	bool "GT911"
+	select INPUT_GT9XX
+	---help---
+		Goodix GT911, fitted to the earlier Tab5 units.
+
+endchoice
+
+config ESP32P4_TAB5_TOUCH_GT911_ADDR
+	hex "GT911 I2C address"
+	depends on ESP32P4_TAB5_TOUCH_GT911
+	default 0x14
+	---help---
+		The GT911 latches its I2C address from the INT pin while it is
+		held in reset: either 0x14 or 0x5d.  Scan the bus with
+		"i2c dev -b 0 0x03 0x77" if unsure.
+
+endif # ESP32P4_TAB5_TOUCHSCREEN
 
 endif # ARCH_BOARD_ESP32P4_TAB5

boards/risc-v/esp32p4/esp32p4-tab5/include/board.h

@@ -63,27 +63,42 @@
  *
  * Enable /dev/fb0 with CONFIG_ESP32P4_TAB5_LCD (see configs/lcd), which
  * selects power + MIPI host + VIDEO_FB.  Select the matching panel with
- * CONFIG_ESP32P4_TAB5_LCD_ST7121 or CONFIG_ESP32P4_TAB5_LCD_ST7123.
+ * CONFIG_ESP32P4_TAB5_LCD_ST7121, CONFIG_ESP32P4_TAB5_LCD_ST7123 or
+ * CONFIG_ESP32P4_TAB5_LCD_ILI9881C (board version 1, paired with GT911).
  */
 
 #define TAB5_GPIO_LCD_BL_EN    22  /* Backlight enable -> ME2212 boost EN */
 
 #define TAB5_MIPI_DSI_H_RES              720
 #define TAB5_MIPI_DSI_V_RES              1280
-#define TAB5_MIPI_DSI_DPI_CLK_MHZ        70
-#define TAB5_MIPI_DSI_HSYNC_PULSE_WIDTH  2
-#define TAB5_MIPI_DSI_HSYNC_BACK_PORCH   40
-#define TAB5_MIPI_DSI_HSYNC_FRONT_PORCH  40
 #define TAB5_MIPI_DSI_LANES              2
 
-#ifdef CONFIG_ESP32P4_TAB5_LCD_ST7123
+#if defined(CONFIG_ESP32P4_TAB5_LCD_ILI9881C)
+#  define TAB5_LCD_PANEL_NAME             "ILI9881C"
+#  define TAB5_MIPI_DSI_DPI_CLK_MHZ        60
+#  define TAB5_MIPI_DSI_HSYNC_PULSE_WIDTH  40
+#  define TAB5_MIPI_DSI_HSYNC_BACK_PORCH   140
+#  define TAB5_MIPI_DSI_HSYNC_FRONT_PORCH  40
+#  define TAB5_MIPI_DSI_VSYNC_PULSE_WIDTH  4
+#  define TAB5_MIPI_DSI_VSYNC_BACK_PORCH   20
+#  define TAB5_MIPI_DSI_VSYNC_FRONT_PORCH  20
+#  define TAB5_MIPI_DSI_LANE_BITRATE_MBPS  1000
+#elif defined(CONFIG_ESP32P4_TAB5_LCD_ST7123)
 #  define TAB5_LCD_PANEL_NAME             "ST7123"
+#  define TAB5_MIPI_DSI_DPI_CLK_MHZ        70
+#  define TAB5_MIPI_DSI_HSYNC_PULSE_WIDTH  2
+#  define TAB5_MIPI_DSI_HSYNC_BACK_PORCH   40
+#  define TAB5_MIPI_DSI_HSYNC_FRONT_PORCH  40
 #  define TAB5_MIPI_DSI_VSYNC_PULSE_WIDTH  2
 #  define TAB5_MIPI_DSI_VSYNC_BACK_PORCH   8
 #  define TAB5_MIPI_DSI_VSYNC_FRONT_PORCH  220
 #  define TAB5_MIPI_DSI_LANE_BITRATE_MBPS  1000
 #else
 #  define TAB5_LCD_PANEL_NAME             "ST7121"
+#  define TAB5_MIPI_DSI_DPI_CLK_MHZ        70
+#  define TAB5_MIPI_DSI_HSYNC_PULSE_WIDTH  2
+#  define TAB5_MIPI_DSI_HSYNC_BACK_PORCH   40
+#  define TAB5_MIPI_DSI_HSYNC_FRONT_PORCH  40
 #  define TAB5_MIPI_DSI_VSYNC_PULSE_WIDTH  20
 #  define TAB5_MIPI_DSI_VSYNC_BACK_PORCH   24
 #  define TAB5_MIPI_DSI_VSYNC_FRONT_PORCH  200

boards/risc-v/esp32p4/esp32p4-tab5/src/CMakeLists.txt

@@ -36,11 +36,17 @@ if(CONFIG_ESP32P4_TAB5_LCD)
     list(APPEND SRCS esp32p4_lcd_st7121.c)
   elseif(CONFIG_ESP32P4_TAB5_LCD_ST7123)
     list(APPEND SRCS esp32p4_lcd_st7123.c)
+  elseif(CONFIG_ESP32P4_TAB5_LCD_ILI9881C)
+    list(APPEND SRCS esp32p4_lcd_ili9881c.c)
   endif()
 endif()
 
 if(CONFIG_ESP32P4_TAB5_TOUCHSCREEN)
-  list(APPEND SRCS esp32p4_touch.c)
+  if(CONFIG_ESP32P4_TAB5_TOUCH_ST7123)
+    list(APPEND SRCS esp32p4_touch_st7123.c)
+  elseif(CONFIG_ESP32P4_TAB5_TOUCH_GT911)
+    list(APPEND SRCS esp32p4_touch_gt911.c)
+  endif()
 endif()
 
 if(CONFIG_BOARDCTL)

boards/risc-v/esp32p4/esp32p4-tab5/src/Make.defs

@@ -42,11 +42,17 @@ ifeq ($(CONFIG_ESP32P4_TAB5_LCD),y)
     CSRCS += esp32p4_lcd_st7121.c
   else ifeq ($(CONFIG_ESP32P4_TAB5_LCD_ST7123),y)
     CSRCS += esp32p4_lcd_st7123.c
+  else ifeq ($(CONFIG_ESP32P4_TAB5_LCD_ILI9881C),y)
+    CSRCS += esp32p4_lcd_ili9881c.c
   endif
 endif
 
 ifeq ($(CONFIG_ESP32P4_TAB5_TOUCHSCREEN),y)
-  CSRCS += esp32p4_touch.c
+  ifeq ($(CONFIG_ESP32P4_TAB5_TOUCH_ST7123),y)
+    CSRCS += esp32p4_touch_st7123.c
+  else ifeq ($(CONFIG_ESP32P4_TAB5_TOUCH_GT911),y)
+    CSRCS += esp32p4_touch_gt911.c
+  endif
 endif
 
 ifeq ($(CONFIG_BOARDCTL),y)

boards/risc-v/esp32p4/esp32p4-tab5/src/esp32p4_display.c

@@ -54,7 +54,10 @@
 
 #include "esp32p4-tab5.h"
 
-#ifdef CONFIG_ESP32P4_TAB5_LCD_ST7123
+#if defined(CONFIG_ESP32P4_TAB5_LCD_ILI9881C)
+#  include "esp32p4_lcd_ili9881c.h"
+#  define tab5_panel_initialize tab5_ili9881c_initialize
+#elif defined(CONFIG_ESP32P4_TAB5_LCD_ST7123)
 #  include "esp32p4_lcd_st7123.h"
 #  define tab5_panel_initialize tab5_st7123_initialize
 #else