1 // SPDX-License-Identifier: GPL-2.0+
14  * Very simple write only SPI support, this does not use the generic SPI infra
15  * because that assumes R/W SPI, requiring a MISO pin. Also the necessary glue
18 static void lcd_panel_spi_write(int cs, int clk, int mosi,  in lcd_panel_spi_write()  argument
25 		gpio_direction_output(clk, 0);  in lcd_panel_spi_write()
26 		offset = (bits - 1) - i;  in lcd_panel_spi_write()
29 		gpio_direction_output(clk, 1);  in lcd_panel_spi_write()
48 	int i, cs, clk, mosi, ret = 0;  in hitachi_tx18d42vm_init()  local
51 	clk = name_to_gpio(CONFIG_VIDEO_LCD_SPI_SCLK);  in hitachi_tx18d42vm_init()
54 	if (cs == -1 || clk == -1 || mosi == 1) {  in hitachi_tx18d42vm_init()
55 		printf("Error tx18d42vm spi gpio config is invalid\n");  in hitachi_tx18d42vm_init()
56 		return -EINVAL;  in hitachi_tx18d42vm_init()
59 	if (gpio_request(cs, "tx18d42vm-spi-cs") != 0 ||  in hitachi_tx18d42vm_init()
60 	    gpio_request(clk, "tx18d42vm-spi-clk") != 0 ||  in hitachi_tx18d42vm_init()
61 	    gpio_request(mosi, "tx18d42vm-spi-mosi") != 0) {  in hitachi_tx18d42vm_init()
62 		printf("Error cannot request tx18d42vm spi gpios\n");  in hitachi_tx18d42vm_init()
63 		ret = -EBUSY;  in hitachi_tx18d42vm_init()
68 		lcd_panel_spi_write(cs, clk, mosi, init_data[i], 16);  in hitachi_tx18d42vm_init()
72 	lcd_panel_spi_write(cs, clk, mosi, 0x00ad, 16); /* display on */  in hitachi_tx18d42vm_init()
76 	gpio_free(clk);  in hitachi_tx18d42vm_init()