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 <mensche...@posteo.de>
---
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 a60f389..0dc0e62 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,
@@ -313,6 +366,27 @@ 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) {
.name = "fb_agm1264k-fl",
--
2.1.4
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