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https://source.denx.de/u-boot/u-boot.git
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d678a59d2d
When bringing in the series 'arm: dts: am62-beagleplay: Fix Beagleplay Ethernet"' I failed to notice that b4 noticed it was based on next and so took that as the base commit and merged that part of next to master. This reverts commitc8ffd1356d, reversing changes made to2ee6f3a5f7. Reported-by: Jonas Karlman <jonas@kwiboo.se> Signed-off-by: Tom Rini <trini@konsulko.com>
142 lines
3.0 KiB
C
142 lines
3.0 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/global_data.h>
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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/device_compat.h>
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#include <dm/devres.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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#include <linux/libfdt.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 | 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 = sizeof(struct i2c_mux_gpio_priv),
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};
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