mirror of
https://github.com/AsahiLinux/u-boot
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83d290c56f
When U-Boot started using SPDX tags we were among the early adopters and there weren't a lot of other examples to borrow from. So we picked the area of the file that usually had a full license text and replaced it with an appropriate SPDX-License-Identifier: entry. Since then, the Linux Kernel has adopted SPDX tags and they place it as the very first line in a file (except where shebangs are used, then it's second line) and with slightly different comment styles than us. In part due to community overlap, in part due to better tag visibility and in part for other minor reasons, switch over to that style. This commit changes all instances where we have a single declared license in the tag as both the before and after are identical in tag contents. There's also a few places where I found we did not have a tag and have introduced one. Signed-off-by: Tom Rini <trini@konsulko.com>
80 lines
2 KiB
C
80 lines
2 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* Hitachi tx18d42vm LVDS LCD panel driver
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*
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* (C) Copyright 2015 Hans de Goede <hdegoede@redhat.com>
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*/
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#include <common.h>
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#include <asm/gpio.h>
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#include <errno.h>
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/*
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* Very simple write only SPI support, this does not use the generic SPI infra
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* because that assumes R/W SPI, requiring a MISO pin. Also the necessary glue
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* code alone would be larger then this minimal version.
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*/
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static void lcd_panel_spi_write(int cs, int clk, int mosi,
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unsigned int data, int bits)
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{
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int i, offset;
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gpio_direction_output(cs, 0);
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for (i = 0; i < bits; i++) {
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gpio_direction_output(clk, 0);
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offset = (bits - 1) - i;
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gpio_direction_output(mosi, (data >> offset) & 1);
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udelay(2);
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gpio_direction_output(clk, 1);
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udelay(2);
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}
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gpio_direction_output(cs, 1);
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udelay(2);
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}
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int hitachi_tx18d42vm_init(void)
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{
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const u16 init_data[] = {
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0x0029, /* reset */
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0x0025, /* standby */
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0x0840, /* enable normally black */
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0x0430, /* enable FRC/dither */
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0x385f, /* enter test mode(1) */
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0x3ca4, /* enter test mode(2) */
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0x3409, /* enable SDRRS, enlarge OE width */
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0x4041, /* adopt 2 line / 1 dot */
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};
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int i, cs, clk, mosi, ret = 0;
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cs = name_to_gpio(CONFIG_VIDEO_LCD_SPI_CS);
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clk = name_to_gpio(CONFIG_VIDEO_LCD_SPI_SCLK);
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mosi = name_to_gpio(CONFIG_VIDEO_LCD_SPI_MOSI);
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if (cs == -1 || clk == -1 || mosi == 1) {
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printf("Error tx18d42vm spi gpio config is invalid\n");
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return -EINVAL;
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}
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if (gpio_request(cs, "tx18d42vm-spi-cs") != 0 ||
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gpio_request(clk, "tx18d42vm-spi-clk") != 0 ||
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gpio_request(mosi, "tx18d42vm-spi-mosi") != 0) {
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printf("Error cannot request tx18d42vm spi gpios\n");
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ret = -EBUSY;
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goto out;
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}
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for (i = 0; i < ARRAY_SIZE(init_data); i++)
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lcd_panel_spi_write(cs, clk, mosi, init_data[i], 16);
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mdelay(50); /* All the tx18d42vm drivers have a delay here ? */
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lcd_panel_spi_write(cs, clk, mosi, 0x00ad, 16); /* display on */
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out:
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gpio_free(mosi);
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gpio_free(clk);
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gpio_free(cs);
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return ret;
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}
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