Tab5 ST7121 variant + fixes (#605)

Added the newest variant to the tab5, St7121.
Fixed variant detection reliability
Fixed tab5 camera WHO_AM_I failing sometimes
Fixed tab5 keyboard live rotation on boot and after stopping/starting lvgl

Drivers/st7121-module/include/bindings/st7121.h

@@ -0,0 +1,10 @@
+// SPDX-License-Identifier: Apache-2.0
+#pragma once
+
+#include <tactility/bindings/bindings.h>
+#include <drivers/st7121.h>
+
+// The devicetree compiler derives the expected config typedef name from the compatible
+// string's suffix (e.g. "sitronix,st7121" -> st7121_config_dt), not from the node name or
+// driver name, so the tag here must match that exactly.
+DEFINE_DEVICETREE(st7121, struct St7121Config)

Drivers/st7121-module/include/drivers/st7121.h

@@ -0,0 +1,68 @@
+// SPDX-License-Identifier: Apache-2.0
+#pragma once
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#include <stdint.h>
+#include <stdbool.h>
+
+#include <tactility/device.h>
+#include <tactility/drivers/gpio.h>
+
+struct St7121Config {
+    uint16_t horizontal_resolution;
+    uint16_t vertical_resolution;
+    uint8_t bits_per_pixel;
+    bool bgr_order;
+    bool invert_color;
+    bool mirror_x;
+    bool mirror_y;
+
+    // Reset pin for the panel. GPIO_PIN_SPEC_NONE falls back to a software reset sent over the
+    // DBI command interface (see esp_lcd_st7121's panel_st7121_reset()).
+    struct GpioPinSpec pin_reset;
+
+    // LDO channel powering the MIPI DSI PHY - the PHY has no power of its own until this is
+    // acquired, so it must happen before the DSI bus is created. Both fields are int32_t (not
+    // uint32_t) to exactly match esp_ldo_channel_config_t's plain `int` fields - assigning a
+    // uint32_t into that struct's brace-init would be a narrowing conversion (-Werror=narrowing).
+    int32_t ldo_channel;
+    int32_t ldo_voltage_mv;
+
+    uint8_t dsi_bus_id;
+    // Number of MIPI DSI data lanes. 0 falls back to the maximum available.
+    uint8_t num_data_lanes;
+    uint32_t lane_bit_rate_mbps;
+
+    uint32_t dpi_clock_freq_mhz;
+    uint32_t hsync_pulse_width;
+    uint32_t hsync_back_porch;
+    uint32_t hsync_front_porch;
+    uint32_t vsync_pulse_width;
+    uint32_t vsync_back_porch;
+    uint32_t vsync_front_porch;
+    // Number of screen-sized frame buffers the driver allocates (0 or 1 = single-buffered).
+    uint8_t num_fbs;
+    bool use_dma2d;
+    bool disable_lp;
+
+    // See the 'allow-tearing' binding property.
+    bool allow_tearing;
+
+    // Custom vendor init sequence, flattened as bytes: a run of
+    // [cmd, data_len, delay_ms, data_len bytes of data...] entries. NULL/0 falls back to the
+    // ST7121 component's own built-in default sequence (see vendor_specific_init_default in
+    // esp_lcd_st7121.c) - not guaranteed to match any particular panel's actual bring-up
+    // requirements.
+    const uint8_t* init_sequence;
+    uint32_t init_sequence_length;
+
+    // Optional reference to this display's backlight device, NULL if none.
+    struct Device* backlight;
+};
+
+#ifdef __cplusplus
+}
+#endif

Drivers/st7121-module/include/st7121_module.h

@@ -0,0 +1,14 @@
+// SPDX-License-Identifier: Apache-2.0
+#pragma once
+
+#include <tactility/module.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+extern struct Module st7121_module;
+
+#ifdef __cplusplus
+}
+#endif