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>
137 lines
2.9 KiB
C
137 lines
2.9 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* I2C multiplexer using GPIO API
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*
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* Copyright 2017 NXP
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*
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* Peng Fan <peng.fan@nxp.com>
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*/
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#include <asm/io.h>
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#include <asm-generic/gpio.h>
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#include <common.h>
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#include <dm.h>
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#include <dm/pinctrl.h>
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#include <fdtdec.h>
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#include <i2c.h>
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#include <linux/errno.h>
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DECLARE_GLOBAL_DATA_PTR;
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/**
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* struct i2c_mux_gpio_priv - private data for i2c mux gpio
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*
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* @values: the reg value of each child node
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* @n_values: num of regs
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* @gpios: the mux-gpios array
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* @n_gpios: num of gpios in mux-gpios
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* @idle: the value of idle-state
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*/
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struct i2c_mux_gpio_priv {
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u32 *values;
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int n_values;
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struct gpio_desc *gpios;
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int n_gpios;
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u32 idle;
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};
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static int i2c_mux_gpio_select(struct udevice *dev, struct udevice *bus,
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uint channel)
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{
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struct i2c_mux_gpio_priv *priv = dev_get_priv(dev);
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int i, ret;
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for (i = 0; i < priv->n_gpios; i++) {
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ret = dm_gpio_set_value(&priv->gpios[i], (channel >> i) & 1);
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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 i2c_mux_gpio_deselect(struct udevice *dev, struct udevice *bus,
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uint channel)
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{
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struct i2c_mux_gpio_priv *priv = dev_get_priv(dev);
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int i, ret;
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for (i = 0; i < priv->n_gpios; i++) {
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ret = dm_gpio_set_value(&priv->gpios[i], (priv->idle >> i) & 1);
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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 i2c_mux_gpio_probe(struct udevice *dev)
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{
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const void *fdt = gd->fdt_blob;
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int node = dev_of_offset(dev);
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struct i2c_mux_gpio_priv *mux = dev_get_priv(dev);
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struct gpio_desc *gpios;
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u32 *values;
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int i = 0, subnode, ret;
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mux->n_values = fdtdec_get_child_count(fdt, node);
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values = devm_kzalloc(dev, sizeof(*mux->values) * mux->n_values,
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GFP_KERNEL);
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if (!values) {
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dev_err(dev, "Cannot alloc values array");
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return -ENOMEM;
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}
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fdt_for_each_subnode(subnode, fdt, node) {
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*(values + i) = fdtdec_get_uint(fdt, subnode, "reg", -1);
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i++;
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}
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mux->values = values;
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mux->idle = fdtdec_get_uint(fdt, node, "idle-state", -1);
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mux->n_gpios = gpio_get_list_count(dev, "mux-gpios");
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if (mux->n_gpios < 0) {
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dev_err(dev, "Missing mux-gpios property\n");
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return -EINVAL;
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}
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gpios = devm_kzalloc(dev, sizeof(struct gpio_desc) * mux->n_gpios,
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GFP_KERNEL);
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if (!gpios) {
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dev_err(dev, "Cannot allocate gpios array\n");
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return -ENOMEM;
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}
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ret = gpio_request_list_by_name(dev, "mux-gpios", gpios, mux->n_gpios,
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GPIOD_IS_OUT_ACTIVE);
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if (ret <= 0) {
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dev_err(dev, "Failed to request mux-gpios\n");
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return ret;
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}
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mux->gpios = gpios;
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return 0;
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}
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static const struct i2c_mux_ops i2c_mux_gpio_ops = {
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.select = i2c_mux_gpio_select,
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.deselect = i2c_mux_gpio_deselect,
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};
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static const struct udevice_id i2c_mux_gpio_ids[] = {
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{ .compatible = "i2c-mux-gpio", },
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{}
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};
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U_BOOT_DRIVER(i2c_mux_gpio) = {
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.name = "i2c_mux_gpio",
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.id = UCLASS_I2C_MUX,
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.of_match = i2c_mux_gpio_ids,
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.ops = &i2c_mux_gpio_ops,
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.probe = i2c_mux_gpio_probe,
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.priv_auto_alloc_size = sizeof(struct i2c_mux_gpio_priv),
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};
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