mirror of
https://github.com/brain-hackers/u-boot-brain
synced 2024-07-05 10:46:15 +09:00
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>
158 lines
3.3 KiB
C
158 lines
3.3 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* Copyright (C) 2015 - 2016 Xilinx, Inc.
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* Copyright (C) 2017 National Instruments Corp
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* Written by Michal Simek
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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 <asm-generic/gpio.h>
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DECLARE_GLOBAL_DATA_PTR;
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enum pca_type {
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PCA9544,
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PCA9547,
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PCA9548
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};
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struct chip_desc {
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u8 enable;
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enum muxtype {
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pca954x_ismux = 0,
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pca954x_isswi,
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} muxtype;
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u32 width;
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};
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struct pca954x_priv {
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u32 addr; /* I2C mux address */
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u32 width; /* I2C mux width - number of busses */
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struct gpio_desc gpio_mux_reset;
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};
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static const struct chip_desc chips[] = {
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[PCA9544] = {
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.enable = 0x4,
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.muxtype = pca954x_ismux,
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.width = 4,
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},
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[PCA9547] = {
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.enable = 0x8,
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.muxtype = pca954x_ismux,
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.width = 8,
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},
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[PCA9548] = {
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.enable = 0x8,
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.muxtype = pca954x_isswi,
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.width = 8,
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},
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};
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static int pca954x_deselect(struct udevice *mux, struct udevice *bus,
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uint channel)
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{
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struct pca954x_priv *priv = dev_get_priv(mux);
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uchar byte = 0;
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return dm_i2c_write(mux, priv->addr, &byte, 1);
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}
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static int pca954x_select(struct udevice *mux, struct udevice *bus,
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uint channel)
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{
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struct pca954x_priv *priv = dev_get_priv(mux);
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const struct chip_desc *chip = &chips[dev_get_driver_data(mux)];
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uchar byte;
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if (chip->muxtype == pca954x_ismux)
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byte = channel | chip->enable;
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else
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byte = 1 << channel;
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return dm_i2c_write(mux, priv->addr, &byte, 1);
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}
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static const struct i2c_mux_ops pca954x_ops = {
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.select = pca954x_select,
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.deselect = pca954x_deselect,
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};
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static const struct udevice_id pca954x_ids[] = {
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{ .compatible = "nxp,pca9544", .data = PCA9544 },
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{ .compatible = "nxp,pca9547", .data = PCA9547 },
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{ .compatible = "nxp,pca9548", .data = PCA9548 },
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{ }
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};
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static int pca954x_ofdata_to_platdata(struct udevice *dev)
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{
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struct pca954x_priv *priv = dev_get_priv(dev);
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const struct chip_desc *chip = &chips[dev_get_driver_data(dev)];
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priv->addr = fdtdec_get_int(gd->fdt_blob, dev_of_offset(dev), "reg", 0);
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if (!priv->addr) {
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debug("MUX not found\n");
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return -ENODEV;
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}
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priv->width = chip->width;
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if (!priv->width) {
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debug("No I2C MUX width specified\n");
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return -EINVAL;
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}
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debug("Device %s at 0x%x with width %d\n",
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dev->name, priv->addr, priv->width);
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return 0;
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}
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static int pca954x_probe(struct udevice *dev)
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{
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if (IS_ENABLED(CONFIG_DM_GPIO)) {
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struct pca954x_priv *priv = dev_get_priv(dev);
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int err;
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err = gpio_request_by_name(dev, "reset-gpios", 0,
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&priv->gpio_mux_reset, GPIOD_IS_OUT);
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/* it's optional so only bail if we get a real error */
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if (err && (err != -ENOENT))
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return err;
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/* dm will take care of polarity */
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if (dm_gpio_is_valid(&priv->gpio_mux_reset))
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dm_gpio_set_value(&priv->gpio_mux_reset, 0);
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}
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return 0;
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}
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static int pca954x_remove(struct udevice *dev)
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{
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if (IS_ENABLED(CONFIG_DM_GPIO)) {
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struct pca954x_priv *priv = dev_get_priv(dev);
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if (dm_gpio_is_valid(&priv->gpio_mux_reset))
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dm_gpio_free(dev, &priv->gpio_mux_reset);
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}
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return 0;
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}
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U_BOOT_DRIVER(pca954x) = {
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.name = "pca954x",
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.id = UCLASS_I2C_MUX,
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.of_match = pca954x_ids,
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.probe = pca954x_probe,
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.remove = pca954x_remove,
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.ops = &pca954x_ops,
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.ofdata_to_platdata = pca954x_ofdata_to_platdata,
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.priv_auto_alloc_size = sizeof(struct pca954x_priv),
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};
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