// SPDX-License-Identifier: GPL-2.0 /* * phy-can-transceiver.c - phy driver for CAN transceivers * * Copyright (C) 2021 Texas Instruments Incorporated - https://www.ti.com * */ #include #include #include #include #include #include #include struct can_transceiver_data { u32 flags; #define CAN_TRANSCEIVER_STB_PRESENT BIT(0) #define CAN_TRANSCEIVER_EN_PRESENT BIT(1) #define CAN_TRANSCEIVER_DUAL_CH BIT(2) #define CAN_TRANSCEIVER_SILENT_PRESENT BIT(3) }; struct can_transceiver_phy { struct phy *generic_phy; struct gpio_desc *silent_gpio; struct gpio_desc *standby_gpio; struct gpio_desc *enable_gpio; struct can_transceiver_priv *priv; }; struct can_transceiver_priv { struct mux_state *mux_state; int num_ch; struct can_transceiver_phy can_transceiver_phy[] __counted_by(num_ch); }; /* Power on function */ static int can_transceiver_phy_power_on(struct phy *phy) { struct can_transceiver_phy *can_transceiver_phy = phy_get_drvdata(phy); struct can_transceiver_priv *priv = can_transceiver_phy->priv; int ret; if (priv->mux_state) { ret = mux_state_select(priv->mux_state); if (ret) { dev_err(&phy->dev, "Failed to select CAN mux: %d\n", ret); return ret; } } gpiod_set_value_cansleep(can_transceiver_phy->silent_gpio, 0); gpiod_set_value_cansleep(can_transceiver_phy->standby_gpio, 0); gpiod_set_value_cansleep(can_transceiver_phy->enable_gpio, 1); return 0; } /* Power off function */ static int can_transceiver_phy_power_off(struct phy *phy) { struct can_transceiver_phy *can_transceiver_phy = phy_get_drvdata(phy); struct can_transceiver_priv *priv = can_transceiver_phy->priv; gpiod_set_value_cansleep(can_transceiver_phy->silent_gpio, 1); gpiod_set_value_cansleep(can_transceiver_phy->standby_gpio, 1); gpiod_set_value_cansleep(can_transceiver_phy->enable_gpio, 0); if (priv->mux_state) mux_state_deselect(priv->mux_state); return 0; } static const struct phy_ops can_transceiver_phy_ops = { .power_on = can_transceiver_phy_power_on, .power_off = can_transceiver_phy_power_off, .owner = THIS_MODULE, }; static const struct can_transceiver_data tcan1042_drvdata = { .flags = CAN_TRANSCEIVER_STB_PRESENT, }; static const struct can_transceiver_data tcan1043_drvdata = { .flags = CAN_TRANSCEIVER_STB_PRESENT | CAN_TRANSCEIVER_EN_PRESENT, }; static const struct can_transceiver_data tja1048_drvdata = { .flags = CAN_TRANSCEIVER_STB_PRESENT | CAN_TRANSCEIVER_DUAL_CH, }; static const struct can_transceiver_data tja1051_drvdata = { .flags = CAN_TRANSCEIVER_SILENT_PRESENT | CAN_TRANSCEIVER_EN_PRESENT, }; static const struct can_transceiver_data tja1057_drvdata = { .flags = CAN_TRANSCEIVER_SILENT_PRESENT, }; static const struct of_device_id can_transceiver_phy_ids[] = { { .compatible = "ti,tcan1042", .data = &tcan1042_drvdata }, { .compatible = "ti,tcan1043", .data = &tcan1043_drvdata }, { .compatible = "nxp,tja1048", .data = &tja1048_drvdata }, { .compatible = "nxp,tja1051", .data = &tja1051_drvdata }, { .compatible = "nxp,tja1057", .data = &tja1057_drvdata }, { .compatible = "nxp,tjr1443", .data = &tcan1043_drvdata }, { } }; MODULE_DEVICE_TABLE(of, can_transceiver_phy_ids); /* Temporary wrapper until the multiplexer subsystem supports optional muxes */ static inline struct mux_state * devm_mux_state_get_optional(struct device *dev, const char *mux_name) { if (!of_property_present(dev->of_node, "mux-states")) return NULL; return devm_mux_state_get(dev, mux_name); } static struct phy *can_transceiver_phy_xlate(struct device *dev, const struct of_phandle_args *args) { struct can_transceiver_priv *priv = dev_get_drvdata(dev); u32 idx; if (priv->num_ch == 1) return priv->can_transceiver_phy[0].generic_phy; if (args->args_count != 1) return ERR_PTR(-EINVAL); idx = args->args[0]; if (idx >= priv->num_ch) return ERR_PTR(-EINVAL); return priv->can_transceiver_phy[idx].generic_phy; } static int can_transceiver_phy_probe(struct platform_device *pdev) { struct phy_provider *phy_provider; struct device *dev = &pdev->dev; struct can_transceiver_phy *can_transceiver_phy; struct can_transceiver_priv *priv; const struct can_transceiver_data *drvdata; const struct of_device_id *match; struct phy *phy; struct gpio_desc *silent_gpio; struct gpio_desc *standby_gpio; struct gpio_desc *enable_gpio; struct mux_state *mux_state; u32 max_bitrate = 0; int err, i, num_ch = 1; match = of_match_node(can_transceiver_phy_ids, pdev->dev.of_node); drvdata = match->data; if (drvdata->flags & CAN_TRANSCEIVER_DUAL_CH) num_ch = 2; priv = devm_kzalloc(dev, struct_size(priv, can_transceiver_phy, num_ch), GFP_KERNEL); if (!priv) return -ENOMEM; priv->num_ch = num_ch; platform_set_drvdata(pdev, priv); mux_state = devm_mux_state_get_optional(dev, NULL); if (IS_ERR(mux_state)) return PTR_ERR(mux_state); priv->mux_state = mux_state; err = device_property_read_u32(dev, "max-bitrate", &max_bitrate); if ((err != -EINVAL) && !max_bitrate) dev_warn(dev, "Invalid value for transceiver max bitrate. Ignoring bitrate limit\n"); for (i = 0; i < num_ch; i++) { can_transceiver_phy = &priv->can_transceiver_phy[i]; can_transceiver_phy->priv = priv; phy = devm_phy_create(dev, dev->of_node, &can_transceiver_phy_ops); if (IS_ERR(phy)) { dev_err(dev, "failed to create can transceiver phy\n"); return PTR_ERR(phy); } phy->attrs.max_link_rate = max_bitrate; can_transceiver_phy->generic_phy = phy; can_transceiver_phy->priv = priv; if (drvdata->flags & CAN_TRANSCEIVER_STB_PRESENT) { standby_gpio = devm_gpiod_get_index_optional(dev, "standby", i, GPIOD_OUT_HIGH); if (IS_ERR(standby_gpio)) return PTR_ERR(standby_gpio); can_transceiver_phy->standby_gpio = standby_gpio; } if (drvdata->flags & CAN_TRANSCEIVER_EN_PRESENT) { enable_gpio = devm_gpiod_get_index_optional(dev, "enable", i, GPIOD_OUT_LOW); if (IS_ERR(enable_gpio)) return PTR_ERR(enable_gpio); can_transceiver_phy->enable_gpio = enable_gpio; } if (drvdata->flags & CAN_TRANSCEIVER_SILENT_PRESENT) { silent_gpio = devm_gpiod_get_index_optional(dev, "silent", i, GPIOD_OUT_LOW); if (IS_ERR(silent_gpio)) return PTR_ERR(silent_gpio); can_transceiver_phy->silent_gpio = silent_gpio; } phy_set_drvdata(can_transceiver_phy->generic_phy, can_transceiver_phy); } phy_provider = devm_of_phy_provider_register(dev, can_transceiver_phy_xlate); return PTR_ERR_OR_ZERO(phy_provider); } static struct platform_driver can_transceiver_phy_driver = { .probe = can_transceiver_phy_probe, .driver = { .name = "can-transceiver-phy", .of_match_table = can_transceiver_phy_ids, }, }; module_platform_driver(can_transceiver_phy_driver); MODULE_AUTHOR("Faiz Abbas "); MODULE_AUTHOR("Aswath Govindraju "); MODULE_DESCRIPTION("CAN TRANSCEIVER PHY driver"); MODULE_LICENSE("GPL v2");