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>
134 lines
3.2 KiB
C
134 lines
3.2 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* Copyright (C) 2015 Google, Inc
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* Written by Simon Glass <sjg@chromium.org>
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*/
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#include <common.h>
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#include <dm.h>
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#include <errno.h>
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#include <i2c.h>
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#include <video_bridge.h>
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#include <power/regulator.h>
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DECLARE_GLOBAL_DATA_PTR;
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/*
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* Initialisation of the chip is a process of writing certain values into
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* certain registers over i2c bus. The chip in fact responds to a range of
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* addresses on the i2c bus, so for each written value three parameters are
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* required: i2c address, register address and the actual value.
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*
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* The base address is derived from the device tree, but oddly the chip
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* responds on several addresses with different register sets for each.
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*/
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/**
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* ps8622_write() Write a PS8622 eDP bridge i2c register
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*
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* @param dev I2C device
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* @param addr_off offset from the i2c base address for ps8622
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* @param reg_addr register address to write
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* @param value value to be written
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* @return 0 on success, non-0 on failure
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*/
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static int ps8622_write(struct udevice *dev, unsigned addr_off,
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unsigned char reg_addr, unsigned char value)
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{
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struct dm_i2c_chip *chip = dev_get_parent_platdata(dev);
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uint8_t buf[2];
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struct i2c_msg msg;
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int ret;
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msg.addr = chip->chip_addr + addr_off;
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msg.flags = 0;
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buf[0] = reg_addr;
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buf[1] = value;
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msg.buf = buf;
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msg.len = 2;
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ret = dm_i2c_xfer(dev, &msg, 1);
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if (ret) {
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debug("%s: write failed, reg=%#x, value=%#x, ret=%d\n",
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__func__, reg_addr, value, ret);
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return ret;
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}
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return 0;
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}
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static int ps8622_set_backlight(struct udevice *dev, int percent)
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{
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int level = percent * 255 / 100;
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debug("%s: level=%d\n", __func__, level);
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return ps8622_write(dev, 0x01, 0xa7, level);
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}
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static int ps8622_attach(struct udevice *dev)
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{
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const uint8_t *params;
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struct udevice *reg;
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int ret, i, len;
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debug("%s: %s\n", __func__, dev->name);
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/* set the LDO providing the 1.2V rail to the Parade bridge */
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ret = uclass_get_device_by_phandle(UCLASS_REGULATOR, dev,
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"power-supply", ®);
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if (!ret) {
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ret = regulator_autoset(reg);
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} else if (ret != -ENOENT) {
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debug("%s: Failed to enable power: ret=%d\n", __func__, ret);
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return ret;
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}
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ret = video_bridge_set_active(dev, true);
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if (ret)
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return ret;
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params = fdt_getprop(gd->fdt_blob, dev_of_offset(dev), "parade,regs",
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&len);
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if (!params || len % 3) {
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debug("%s: missing/invalid params=%p, len=%x\n", __func__,
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params, len);
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return -EINVAL;
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}
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/* need to wait 20ms after power on before doing I2C writes */
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mdelay(20);
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for (i = 0; i < len; i += 3) {
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ret = ps8622_write(dev, params[i + 0], params[i + 1],
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params[i + 2]);
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if (ret)
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return ret;
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}
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return 0;
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}
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static int ps8622_probe(struct udevice *dev)
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{
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debug("%s\n", __func__);
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if (device_get_uclass_id(dev->parent) != UCLASS_I2C)
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return -EPROTONOSUPPORT;
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return 0;
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}
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struct video_bridge_ops ps8622_ops = {
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.attach = ps8622_attach,
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.set_backlight = ps8622_set_backlight,
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};
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static const struct udevice_id ps8622_ids[] = {
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{ .compatible = "parade,ps8622", },
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{ .compatible = "parade,ps8625", },
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{ }
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};
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U_BOOT_DRIVER(parade_ps8622) = {
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.name = "parade_ps8622",
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.id = UCLASS_VIDEO_BRIDGE,
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.of_match = ps8622_ids,
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.probe = ps8622_probe,
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.ops = &ps8622_ops,
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};
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