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Commit e9f68065 authored by Dennis Menschel's avatar Dennis Menschel Committed by Greg Kroah-Hartman
Browse files

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: default avatarDennis Menschel <menschel-d@posteo.de>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent d4c402ff

drivers/staging/fbtft/fbtft_device.c

+74 −0
Original line number Diff line number Diff line
@@ -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) {