C / C++ / MFC

Serial.println(dataToSend);

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The real question - how does "dev" framebuffer gets to output to "dev" SPI?

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Use the speed= argument to make it a SPI device, or else it becomes a platform_device

sudo modprobe fbtft_device name=rpi-display speed=32000000

struct fbcon_font_desc {
    int index ; // idx;
    char *name;
    int width, height;
    unsigned char *data;   // font data
    int pref;
} font_vga_8x8 = // this is the name of the actual structure variable
{
    VGA8x8_IDX,
    "VGA8x8",
    8,
    8,
    fontdata_8x8,
    0
};

struct fbcon_font_desc {
    int index ; // idx;
    char *name;
    int width, height;
    unsigned char *data;   // font data
    int pref;
};
// Type is struct fbcon_font_desc
struct fbcon_font_desc font_vga_8x8 = { /* init members here */ };

typedef struct {
    int index ; // idx;
    char *name;
    int width, height;
    unsigned char *data;   // font data
    int pref;
} fbcon_font_desc;
// Type is fbcon_font_desc
fbcon_font_desc font_vga_8x8 = { /* init members here */ };