148 lines
4.1 KiB
C
148 lines
4.1 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* phy-can-transceiver.c - phy driver for CAN transceivers
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*
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* Copyright (C) 2021 Texas Instruments Incorporated - https://www.ti.com
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*
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*/
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#include<linux/phy/phy.h>
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#include<linux/platform_device.h>
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#include<linux/module.h>
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#include<linux/gpio.h>
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#include<linux/gpio/consumer.h>
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struct can_transceiver_data {
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u32 flags;
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#define CAN_TRANSCEIVER_STB_PRESENT BIT(0)
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#define CAN_TRANSCEIVER_EN_PRESENT BIT(1)
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};
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struct can_transceiver_phy {
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struct phy *generic_phy;
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struct gpio_desc *standby_gpio;
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struct gpio_desc *enable_gpio;
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};
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/* Power on function */
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static int can_transceiver_phy_power_on(struct phy *phy)
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{
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struct can_transceiver_phy *can_transceiver_phy = phy_get_drvdata(phy);
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if (can_transceiver_phy->standby_gpio)
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gpiod_set_value_cansleep(can_transceiver_phy->standby_gpio, 0);
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if (can_transceiver_phy->enable_gpio)
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gpiod_set_value_cansleep(can_transceiver_phy->enable_gpio, 1);
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return 0;
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}
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/* Power off function */
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static int can_transceiver_phy_power_off(struct phy *phy)
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{
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struct can_transceiver_phy *can_transceiver_phy = phy_get_drvdata(phy);
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if (can_transceiver_phy->standby_gpio)
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gpiod_set_value_cansleep(can_transceiver_phy->standby_gpio, 1);
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if (can_transceiver_phy->enable_gpio)
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gpiod_set_value_cansleep(can_transceiver_phy->enable_gpio, 0);
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return 0;
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}
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static const struct phy_ops can_transceiver_phy_ops = {
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.power_on = can_transceiver_phy_power_on,
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.power_off = can_transceiver_phy_power_off,
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.owner = THIS_MODULE,
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};
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static const struct can_transceiver_data tcan1042_drvdata = {
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.flags = CAN_TRANSCEIVER_STB_PRESENT,
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};
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static const struct can_transceiver_data tcan1043_drvdata = {
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.flags = CAN_TRANSCEIVER_STB_PRESENT | CAN_TRANSCEIVER_EN_PRESENT,
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};
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static const struct of_device_id can_transceiver_phy_ids[] = {
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{
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.compatible = "ti,tcan1042",
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.data = &tcan1042_drvdata
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},
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{
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.compatible = "ti,tcan1043",
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.data = &tcan1043_drvdata
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},
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{ }
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};
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MODULE_DEVICE_TABLE(of, can_transceiver_phy_ids);
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static int can_transceiver_phy_probe(struct platform_device *pdev)
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{
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struct phy_provider *phy_provider;
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struct device *dev = &pdev->dev;
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struct can_transceiver_phy *can_transceiver_phy;
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const struct can_transceiver_data *drvdata;
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const struct of_device_id *match;
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struct phy *phy;
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struct gpio_desc *standby_gpio;
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struct gpio_desc *enable_gpio;
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u32 max_bitrate = 0;
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int err;
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can_transceiver_phy = devm_kzalloc(dev, sizeof(struct can_transceiver_phy), GFP_KERNEL);
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if (!can_transceiver_phy)
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return -ENOMEM;
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match = of_match_node(can_transceiver_phy_ids, pdev->dev.of_node);
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drvdata = match->data;
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phy = devm_phy_create(dev, dev->of_node,
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&can_transceiver_phy_ops);
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if (IS_ERR(phy)) {
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dev_err(dev, "failed to create can transceiver phy\n");
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return PTR_ERR(phy);
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}
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err = device_property_read_u32(dev, "max-bitrate", &max_bitrate);
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if ((err != -EINVAL) && !max_bitrate)
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dev_warn(dev, "Invalid value for transceiver max bitrate. Ignoring bitrate limit\n");
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phy->attrs.max_link_rate = max_bitrate;
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can_transceiver_phy->generic_phy = phy;
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if (drvdata->flags & CAN_TRANSCEIVER_STB_PRESENT) {
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standby_gpio = devm_gpiod_get(dev, "standby", GPIOD_OUT_HIGH);
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if (IS_ERR(standby_gpio))
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return PTR_ERR(standby_gpio);
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can_transceiver_phy->standby_gpio = standby_gpio;
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}
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if (drvdata->flags & CAN_TRANSCEIVER_EN_PRESENT) {
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enable_gpio = devm_gpiod_get(dev, "enable", GPIOD_OUT_LOW);
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if (IS_ERR(enable_gpio))
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return PTR_ERR(enable_gpio);
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can_transceiver_phy->enable_gpio = enable_gpio;
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}
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phy_set_drvdata(can_transceiver_phy->generic_phy, can_transceiver_phy);
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phy_provider = devm_of_phy_provider_register(dev, of_phy_simple_xlate);
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return PTR_ERR_OR_ZERO(phy_provider);
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}
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static struct platform_driver can_transceiver_phy_driver = {
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.probe = can_transceiver_phy_probe,
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.driver = {
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.name = "can-transceiver-phy",
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.of_match_table = can_transceiver_phy_ids,
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},
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};
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module_platform_driver(can_transceiver_phy_driver);
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MODULE_AUTHOR("Faiz Abbas <faiz_abbas@ti.com>");
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MODULE_AUTHOR("Aswath Govindraju <a-govindraju@ti.com>");
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MODULE_DESCRIPTION("CAN TRANSCEIVER PHY driver");
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MODULE_LICENSE("GPL v2");
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