From e9f6806551c3b2f02fa8225582d731994a3f3fa2 Mon Sep 17 00:00:00 2001 From: Dennis Menschel Date: Wed, 7 Oct 2015 22:15:46 +0200 Subject: [PATCH] staging: fbtft: add support for C-Berry28 display This patch adds support for the C-Berry28, a small 2.8" color display with a resolution of 320x240 pixels from admatec for the Raspberry Pi. It uses the Sitronix ST7789V display controller along with a custom init sequence and custom gamma curves. Signed-off-by: Dennis Menschel Signed-off-by: Greg Kroah-Hartman --- drivers/staging/fbtft/fbtft_device.c | 74 ++++++++++++++++++++++++++++ 1 file changed, 74 insertions(+) diff --git a/drivers/staging/fbtft/fbtft_device.c b/drivers/staging/fbtft/fbtft_device.c index a60f389122b0..0e501d093251 100644 --- a/drivers/staging/fbtft/fbtft_device.c +++ b/drivers/staging/fbtft/fbtft_device.c @@ -126,6 +126,59 @@ static void adafruit18_green_tab_set_addr_win(struct fbtft_par *par, "02 1c 07 12 37 32 29 2d 29 25 2B 39 00 01 03 10\n" \ "03 1d 07 06 2E 2C 29 2D 2E 2E 37 3F 00 00 02 10" +#define CBERRY28_GAMMA \ + "D0 00 14 15 13 2C 42 43 4E 09 16 14 18 21\n" \ + "D0 00 14 15 13 0B 43 55 53 0C 17 14 23 20" + +static int cberry28_init_sequence[] = { + /* turn off sleep mode */ + -1, 0x11, + -2, 120, + + /* set pixel format to RGB-565 */ + -1, 0x3A, 0x05, + + -1, 0xB2, 0x0C, 0x0C, 0x00, 0x33, 0x33, + + /* + * VGH = 13.26V + * VGL = -10.43V + */ + -1, 0xB7, 0x35, + + /* + * VDV and VRH register values come from command write + * (instead of NVM) + */ + -1, 0xC2, 0x01, 0xFF, + + /* + * VAP = 4.7V + (VCOM + VCOM offset + 0.5 * VDV) + * VAN = -4.7V + (VCOM + VCOM offset + 0.5 * VDV) + */ + -1, 0xC3, 0x17, + + /* VDV = 0V */ + -1, 0xC4, 0x20, + + /* VCOM = 0.875V */ + -1, 0xBB, 0x1F, + + /* VCOM offset = 0V */ + -1, 0xC5, 0x20, + + /* + * AVDD = 6.6V + * AVCL = -4.8V + * VDS = 2.3V + */ + -1, 0xD0, 0xA4, 0x61, + + -1, 0x29, + + -3, +}; + static int hy28b_init_sequence[] = { -1, 0x00e7, 0x0010, -1, 0x0000, 0x0001, -1, 0x0001, 0x0100, -1, 0x0002, 0x0700, @@ -312,6 +365,27 @@ static struct fbtft_device_display displays[] = { }, } } + }, { + .name = "admatec_c-berry28", + .spi = &(struct spi_board_info) { + .modalias = "fb_st7789v", + .max_speed_hz = 48000000, + .mode = SPI_MODE_0, + .platform_data = &(struct fbtft_platform_data) { + .display = { + .buswidth = 8, + .backlight = 1, + .init_sequence = cberry28_init_sequence, + }, + .gpios = (const struct fbtft_gpio []) { + { "reset", 25 }, + { "dc", 22 }, + { "led", 18 }, + {}, + }, + .gamma = CBERRY28_GAMMA, + } + } }, { .name = "agm1264k-fl", .pdev = &(struct platform_device) { -- 2.39.5