// SPDX-License-Identifier: GPL-2.0+
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/*
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* (C) Copyright 2022 Rockchip Electronics Co., Ltd
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*/
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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 <errno.h>
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#include <i2c.h>
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#include <max96745.h>
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struct max96745_priv {
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struct udevice *dev;
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struct gpio_desc enable_gpio;
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struct gpio_desc pwdnb_gpio;
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bool idle_disc;
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};
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static int max96745_select(struct udevice *mux, struct udevice *bus,
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uint channel)
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{
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struct max96745_priv *priv = dev_get_priv(mux);
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if (!priv->idle_disc)
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return 0;
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if (channel == 1)
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dm_i2c_reg_clrset(mux, 0x0086, DIS_REM_CC,
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FIELD_PREP(DIS_REM_CC, 0));
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else
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dm_i2c_reg_clrset(mux, 0x0076, DIS_REM_CC,
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FIELD_PREP(DIS_REM_CC, 0));
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return 0;
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}
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static int max96745_deselect(struct udevice *mux, struct udevice *bus,
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uint channel)
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{
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struct max96745_priv *priv = dev_get_priv(mux);
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if (!priv->idle_disc)
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return 0;
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if (channel == 1)
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dm_i2c_reg_clrset(mux, 0x0086, DIS_REM_CC,
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FIELD_PREP(DIS_REM_CC, 1));
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else
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dm_i2c_reg_clrset(mux, 0x0076, DIS_REM_CC,
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FIELD_PREP(DIS_REM_CC, 1));
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return 0;
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}
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static const struct i2c_mux_ops max96745_ops = {
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.select = max96745_select,
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.deselect = max96745_deselect,
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};
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static int max96745_power_on(struct max96745_priv *priv)
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{
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int ret;
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if (dm_gpio_is_valid(&priv->enable_gpio)) {
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dm_gpio_set_value(&priv->enable_gpio, 1);
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mdelay(200);
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}
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if (dm_gpio_is_valid(&priv->pwdnb_gpio)) {
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dm_gpio_set_value(&priv->pwdnb_gpio, 0);
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mdelay(30);
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}
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/* Set for I2C Fast-mode speed */
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ret = dm_i2c_reg_write(priv->dev, 0x0070, 0x16);
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if (ret < 0)
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return ret;
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if (priv->idle_disc) {
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ret = dm_i2c_reg_clrset(priv->dev, 0x0076, DIS_REM_CC,
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FIELD_PREP(DIS_REM_CC, 1));
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if (ret < 0)
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return ret;
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ret = dm_i2c_reg_clrset(priv->dev, 0x0086, DIS_REM_CC,
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FIELD_PREP(DIS_REM_CC, 1));
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if (ret < 0)
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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 max96745_probe(struct udevice *dev)
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{
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struct max96745_priv *priv = dev_get_priv(dev);
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int ret;
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ret = i2c_set_chip_offset_len(dev, 2);
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if (ret)
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return ret;
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priv->dev = dev;
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priv->idle_disc = dev_read_bool(dev, "i2c-mux-idle-disconnect");
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ret = gpio_request_by_name(dev, "enable-gpios", 0,
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&priv->enable_gpio, GPIOD_IS_OUT);
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if (ret && ret != -ENOENT) {
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dev_err(dev, "%s: failed to get enable GPIO: %d\n", __func__, ret);
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return ret;
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}
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ret = gpio_request_by_name(dev, "pwdnb-gpios", 0,
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&priv->pwdnb_gpio, GPIOD_IS_OUT);
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if (ret && ret != -ENOENT) {
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dev_err(dev, "%s: failed to get pwdnb GPIO: %d\n", __func__, ret);
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return ret;
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}
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max96745_power_on(priv);
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return 0;
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}
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static const struct udevice_id max96745_of_match[] = {
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{ .compatible = "maxim,max96745" },
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{}
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};
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U_BOOT_DRIVER(max96745) = {
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.name = "max96745",
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.id = UCLASS_I2C_MUX,
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.of_match = max96745_of_match,
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.bind = dm_scan_fdt_dev,
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.probe = max96745_probe,
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.ops = &max96745_ops,
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.priv_auto_alloc_size = sizeof(struct max96745_priv),
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};
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