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229 lines
4.9 KiB
229 lines
4.9 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/* |
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* Microchip KSZ8863 series register access through SMI |
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* |
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* Copyright (C) 2019 Pengutronix, Michael Grzeschik <[email protected]> |
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*/ |
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#include "ksz8.h" |
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#include "ksz_common.h" |
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/* Serial Management Interface (SMI) uses the following frame format: |
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* |
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* preamble|start|Read/Write| PHY | REG |TA| Data bits | Idle |
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* |frame| OP code |address |address| | | |
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* read | 32x1´s | 01 | 00 | 1xRRR | RRRRR |Z0| 00000000DDDDDDDD | Z |
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* write| 32x1´s | 01 | 00 | 0xRRR | RRRRR |10| xxxxxxxxDDDDDDDD | Z |
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* |
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*/ |
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#define SMI_KSZ88XX_READ_PHY BIT(4) |
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static int ksz8863_mdio_read(void *ctx, const void *reg_buf, size_t reg_len, |
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void *val_buf, size_t val_len) |
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{ |
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struct ksz_device *dev = ctx; |
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struct mdio_device *mdev; |
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u8 reg = *(u8 *)reg_buf; |
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u8 *val = val_buf; |
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struct ksz8 *ksz8; |
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int i, ret = 0; |
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ksz8 = dev->priv; |
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mdev = ksz8->priv; |
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mutex_lock_nested(&mdev->bus->mdio_lock, MDIO_MUTEX_NESTED); |
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for (i = 0; i < val_len; i++) { |
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int tmp = reg + i; |
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ret = __mdiobus_read(mdev->bus, ((tmp & 0xE0) >> 5) | |
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SMI_KSZ88XX_READ_PHY, tmp); |
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if (ret < 0) |
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goto out; |
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val[i] = ret; |
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} |
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ret = 0; |
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out: |
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mutex_unlock(&mdev->bus->mdio_lock); |
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return ret; |
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} |
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static int ksz8863_mdio_write(void *ctx, const void *data, size_t count) |
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{ |
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struct ksz_device *dev = ctx; |
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struct mdio_device *mdev; |
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struct ksz8 *ksz8; |
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int i, ret = 0; |
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u32 reg; |
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u8 *val; |
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ksz8 = dev->priv; |
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mdev = ksz8->priv; |
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val = (u8 *)(data + 4); |
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reg = *(u32 *)data; |
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mutex_lock_nested(&mdev->bus->mdio_lock, MDIO_MUTEX_NESTED); |
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for (i = 0; i < (count - 4); i++) { |
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int tmp = reg + i; |
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ret = __mdiobus_write(mdev->bus, ((tmp & 0xE0) >> 5), |
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tmp, val[i]); |
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if (ret < 0) |
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goto out; |
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} |
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out: |
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mutex_unlock(&mdev->bus->mdio_lock); |
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return ret; |
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} |
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static const struct regmap_bus regmap_smi[] = { |
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{ |
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.read = ksz8863_mdio_read, |
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.write = ksz8863_mdio_write, |
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.max_raw_read = 1, |
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.max_raw_write = 1, |
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}, |
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{ |
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.read = ksz8863_mdio_read, |
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.write = ksz8863_mdio_write, |
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.val_format_endian_default = REGMAP_ENDIAN_BIG, |
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.max_raw_read = 2, |
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.max_raw_write = 2, |
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}, |
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{ |
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.read = ksz8863_mdio_read, |
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.write = ksz8863_mdio_write, |
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.val_format_endian_default = REGMAP_ENDIAN_BIG, |
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.max_raw_read = 4, |
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.max_raw_write = 4, |
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} |
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}; |
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static const struct regmap_config ksz8863_regmap_config[] = { |
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{ |
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.name = "#8", |
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.reg_bits = 8, |
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.pad_bits = 24, |
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.val_bits = 8, |
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.cache_type = REGCACHE_NONE, |
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.use_single_read = 1, |
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.lock = ksz_regmap_lock, |
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.unlock = ksz_regmap_unlock, |
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}, |
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{ |
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.name = "#16", |
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.reg_bits = 8, |
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.pad_bits = 24, |
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.val_bits = 16, |
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.cache_type = REGCACHE_NONE, |
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.use_single_read = 1, |
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.lock = ksz_regmap_lock, |
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.unlock = ksz_regmap_unlock, |
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}, |
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{ |
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.name = "#32", |
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.reg_bits = 8, |
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.pad_bits = 24, |
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.val_bits = 32, |
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.cache_type = REGCACHE_NONE, |
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.use_single_read = 1, |
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.lock = ksz_regmap_lock, |
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.unlock = ksz_regmap_unlock, |
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} |
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}; |
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static int ksz8863_smi_probe(struct mdio_device *mdiodev) |
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{ |
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struct regmap_config rc; |
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struct ksz_device *dev; |
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struct ksz8 *ksz8; |
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int ret; |
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int i; |
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ksz8 = devm_kzalloc(&mdiodev->dev, sizeof(struct ksz8), GFP_KERNEL); |
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if (!ksz8) |
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return -ENOMEM; |
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ksz8->priv = mdiodev; |
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dev = ksz_switch_alloc(&mdiodev->dev, ksz8); |
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if (!dev) |
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return -ENOMEM; |
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for (i = 0; i < ARRAY_SIZE(ksz8863_regmap_config); i++) { |
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rc = ksz8863_regmap_config[i]; |
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rc.lock_arg = &dev->regmap_mutex; |
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dev->regmap[i] = devm_regmap_init(&mdiodev->dev, |
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®map_smi[i], dev, |
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&rc); |
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if (IS_ERR(dev->regmap[i])) { |
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ret = PTR_ERR(dev->regmap[i]); |
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dev_err(&mdiodev->dev, |
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"Failed to initialize regmap%i: %d\n", |
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ksz8863_regmap_config[i].val_bits, ret); |
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return ret; |
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} |
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} |
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if (mdiodev->dev.platform_data) |
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dev->pdata = mdiodev->dev.platform_data; |
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ret = ksz8_switch_register(dev); |
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/* Main DSA driver may not be started yet. */ |
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if (ret) |
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return ret; |
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dev_set_drvdata(&mdiodev->dev, dev); |
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return 0; |
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} |
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static void ksz8863_smi_remove(struct mdio_device *mdiodev) |
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{ |
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struct ksz_device *dev = dev_get_drvdata(&mdiodev->dev); |
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if (dev) |
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ksz_switch_remove(dev); |
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dev_set_drvdata(&mdiodev->dev, NULL); |
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} |
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static void ksz8863_smi_shutdown(struct mdio_device *mdiodev) |
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{ |
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struct ksz_device *dev = dev_get_drvdata(&mdiodev->dev); |
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if (dev) |
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dsa_switch_shutdown(dev->ds); |
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dev_set_drvdata(&mdiodev->dev, NULL); |
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} |
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static const struct of_device_id ksz8863_dt_ids[] = { |
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{ .compatible = "microchip,ksz8863" }, |
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{ .compatible = "microchip,ksz8873" }, |
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{ }, |
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}; |
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MODULE_DEVICE_TABLE(of, ksz8863_dt_ids); |
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static struct mdio_driver ksz8863_driver = { |
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.probe = ksz8863_smi_probe, |
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.remove = ksz8863_smi_remove, |
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.shutdown = ksz8863_smi_shutdown, |
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.mdiodrv.driver = { |
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.name = "ksz8863-switch", |
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.of_match_table = ksz8863_dt_ids, |
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}, |
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}; |
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mdio_module_driver(ksz8863_driver); |
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MODULE_AUTHOR("Michael Grzeschik <[email protected]>"); |
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MODULE_DESCRIPTION("Microchip KSZ8863 SMI Switch driver"); |
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MODULE_LICENSE("GPL v2");
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