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256 lines
6.3 KiB
256 lines
6.3 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* Lantiq XWAY SoC RCU module based USB 1.1/2.0 PHY driver |
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* |
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* Copyright (C) 2016 Martin Blumenstingl <[email protected]> |
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* Copyright (C) 2017 Hauke Mehrtens <[email protected]> |
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*/ |
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#include <linux/clk.h> |
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#include <linux/delay.h> |
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#include <linux/mfd/syscon.h> |
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#include <linux/module.h> |
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#include <linux/of.h> |
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#include <linux/of_address.h> |
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#include <linux/of_device.h> |
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#include <linux/phy/phy.h> |
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#include <linux/platform_device.h> |
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#include <linux/property.h> |
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#include <linux/regmap.h> |
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#include <linux/reset.h> |
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/* Transmitter HS Pre-Emphasis Enable */ |
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#define RCU_CFG1_TX_PEE BIT(0) |
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/* Disconnect Threshold */ |
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#define RCU_CFG1_DIS_THR_MASK 0x00038000 |
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#define RCU_CFG1_DIS_THR_SHIFT 15 |
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struct ltq_rcu_usb2_bits { |
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u8 hostmode; |
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u8 slave_endianness; |
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u8 host_endianness; |
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bool have_ana_cfg; |
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}; |
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struct ltq_rcu_usb2_priv { |
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struct regmap *regmap; |
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unsigned int phy_reg_offset; |
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unsigned int ana_cfg1_reg_offset; |
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const struct ltq_rcu_usb2_bits *reg_bits; |
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struct device *dev; |
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struct phy *phy; |
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struct clk *phy_gate_clk; |
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struct reset_control *ctrl_reset; |
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struct reset_control *phy_reset; |
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}; |
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static const struct ltq_rcu_usb2_bits xway_rcu_usb2_reg_bits = { |
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.hostmode = 11, |
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.slave_endianness = 9, |
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.host_endianness = 10, |
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.have_ana_cfg = false, |
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}; |
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static const struct ltq_rcu_usb2_bits xrx100_rcu_usb2_reg_bits = { |
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.hostmode = 11, |
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.slave_endianness = 17, |
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.host_endianness = 10, |
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.have_ana_cfg = false, |
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}; |
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static const struct ltq_rcu_usb2_bits xrx200_rcu_usb2_reg_bits = { |
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.hostmode = 11, |
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.slave_endianness = 9, |
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.host_endianness = 10, |
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.have_ana_cfg = true, |
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}; |
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static const struct of_device_id ltq_rcu_usb2_phy_of_match[] = { |
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{ |
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.compatible = "lantiq,ase-usb2-phy", |
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.data = &xway_rcu_usb2_reg_bits, |
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}, |
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{ |
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.compatible = "lantiq,danube-usb2-phy", |
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.data = &xway_rcu_usb2_reg_bits, |
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}, |
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{ |
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.compatible = "lantiq,xrx100-usb2-phy", |
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.data = &xrx100_rcu_usb2_reg_bits, |
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}, |
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{ |
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.compatible = "lantiq,xrx200-usb2-phy", |
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.data = &xrx200_rcu_usb2_reg_bits, |
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}, |
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{ |
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.compatible = "lantiq,xrx300-usb2-phy", |
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.data = &xrx200_rcu_usb2_reg_bits, |
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}, |
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{ }, |
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}; |
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MODULE_DEVICE_TABLE(of, ltq_rcu_usb2_phy_of_match); |
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static int ltq_rcu_usb2_phy_init(struct phy *phy) |
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{ |
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struct ltq_rcu_usb2_priv *priv = phy_get_drvdata(phy); |
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if (priv->reg_bits->have_ana_cfg) { |
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regmap_update_bits(priv->regmap, priv->ana_cfg1_reg_offset, |
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RCU_CFG1_TX_PEE, RCU_CFG1_TX_PEE); |
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regmap_update_bits(priv->regmap, priv->ana_cfg1_reg_offset, |
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RCU_CFG1_DIS_THR_MASK, 7 << RCU_CFG1_DIS_THR_SHIFT); |
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} |
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/* Configure core to host mode */ |
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regmap_update_bits(priv->regmap, priv->phy_reg_offset, |
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BIT(priv->reg_bits->hostmode), 0); |
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/* Select DMA endianness (Host-endian: big-endian) */ |
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regmap_update_bits(priv->regmap, priv->phy_reg_offset, |
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BIT(priv->reg_bits->slave_endianness), 0); |
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regmap_update_bits(priv->regmap, priv->phy_reg_offset, |
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BIT(priv->reg_bits->host_endianness), |
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BIT(priv->reg_bits->host_endianness)); |
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return 0; |
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} |
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static int ltq_rcu_usb2_phy_power_on(struct phy *phy) |
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{ |
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struct ltq_rcu_usb2_priv *priv = phy_get_drvdata(phy); |
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struct device *dev = priv->dev; |
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int ret; |
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reset_control_deassert(priv->phy_reset); |
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ret = clk_prepare_enable(priv->phy_gate_clk); |
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if (ret) { |
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dev_err(dev, "failed to enable PHY gate\n"); |
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return ret; |
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} |
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/* |
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* at least the xrx200 usb2 phy requires some extra time to be |
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* operational after enabling the clock |
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*/ |
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usleep_range(100, 200); |
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return ret; |
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} |
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static int ltq_rcu_usb2_phy_power_off(struct phy *phy) |
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{ |
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struct ltq_rcu_usb2_priv *priv = phy_get_drvdata(phy); |
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reset_control_assert(priv->phy_reset); |
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clk_disable_unprepare(priv->phy_gate_clk); |
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return 0; |
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} |
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static const struct phy_ops ltq_rcu_usb2_phy_ops = { |
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.init = ltq_rcu_usb2_phy_init, |
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.power_on = ltq_rcu_usb2_phy_power_on, |
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.power_off = ltq_rcu_usb2_phy_power_off, |
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.owner = THIS_MODULE, |
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}; |
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static int ltq_rcu_usb2_of_parse(struct ltq_rcu_usb2_priv *priv, |
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struct platform_device *pdev) |
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{ |
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struct device *dev = priv->dev; |
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const __be32 *offset; |
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priv->reg_bits = of_device_get_match_data(dev); |
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priv->regmap = syscon_node_to_regmap(dev->of_node->parent); |
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if (IS_ERR(priv->regmap)) { |
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dev_err(dev, "Failed to lookup RCU regmap\n"); |
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return PTR_ERR(priv->regmap); |
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} |
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offset = of_get_address(dev->of_node, 0, NULL, NULL); |
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if (!offset) { |
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dev_err(dev, "Failed to get RCU PHY reg offset\n"); |
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return -ENOENT; |
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} |
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priv->phy_reg_offset = __be32_to_cpu(*offset); |
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if (priv->reg_bits->have_ana_cfg) { |
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offset = of_get_address(dev->of_node, 1, NULL, NULL); |
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if (!offset) { |
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dev_err(dev, "Failed to get RCU ANA CFG1 reg offset\n"); |
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return -ENOENT; |
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} |
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priv->ana_cfg1_reg_offset = __be32_to_cpu(*offset); |
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} |
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priv->phy_gate_clk = devm_clk_get(dev, "phy"); |
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if (IS_ERR(priv->phy_gate_clk)) { |
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dev_err(dev, "Unable to get USB phy gate clk\n"); |
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return PTR_ERR(priv->phy_gate_clk); |
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} |
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priv->ctrl_reset = devm_reset_control_get_shared(dev, "ctrl"); |
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if (IS_ERR(priv->ctrl_reset)) { |
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if (PTR_ERR(priv->ctrl_reset) != -EPROBE_DEFER) |
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dev_err(dev, "failed to get 'ctrl' reset\n"); |
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return PTR_ERR(priv->ctrl_reset); |
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} |
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priv->phy_reset = devm_reset_control_get_optional(dev, "phy"); |
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return PTR_ERR_OR_ZERO(priv->phy_reset); |
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} |
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static int ltq_rcu_usb2_phy_probe(struct platform_device *pdev) |
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{ |
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struct device *dev = &pdev->dev; |
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struct ltq_rcu_usb2_priv *priv; |
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struct phy_provider *provider; |
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int ret; |
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priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL); |
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if (!priv) |
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return -ENOMEM; |
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priv->dev = dev; |
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ret = ltq_rcu_usb2_of_parse(priv, pdev); |
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if (ret) |
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return ret; |
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/* Reset USB core through reset controller */ |
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reset_control_deassert(priv->ctrl_reset); |
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reset_control_assert(priv->phy_reset); |
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priv->phy = devm_phy_create(dev, dev->of_node, <q_rcu_usb2_phy_ops); |
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if (IS_ERR(priv->phy)) { |
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dev_err(dev, "failed to create PHY\n"); |
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return PTR_ERR(priv->phy); |
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} |
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phy_set_drvdata(priv->phy, priv); |
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provider = devm_of_phy_provider_register(dev, of_phy_simple_xlate); |
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if (IS_ERR(provider)) |
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return PTR_ERR(provider); |
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dev_set_drvdata(priv->dev, priv); |
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return 0; |
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} |
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static struct platform_driver ltq_rcu_usb2_phy_driver = { |
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.probe = ltq_rcu_usb2_phy_probe, |
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.driver = { |
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.name = "lantiq-rcu-usb2-phy", |
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.of_match_table = ltq_rcu_usb2_phy_of_match, |
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} |
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}; |
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module_platform_driver(ltq_rcu_usb2_phy_driver); |
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MODULE_AUTHOR("Martin Blumenstingl <[email protected]>"); |
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MODULE_DESCRIPTION("Lantiq XWAY USB2 PHY driver"); |
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MODULE_LICENSE("GPL v2");
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