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[83.47.240.79]) by smtp.gmail.com with ESMTPSA id y66sm2979820wmd.37.2019.03.14.06.22.13 (version=TLS1_2 cipher=ECDHE-RSA-AES128-SHA bits=128/128); Thu, 14 Mar 2019 06:22:13 -0700 (PDT) From: Sergio Paracuellos To: kishon@ti.com Cc: linux-kernel@vger.kernel.org, driverdev-devel@linuxdriverproject.org, devicetree@vger.kernel.org, john@phrozen.org, linux-mips@vger.kernel.org, robh+dt@kernel.org, neil@brown.name Subject: [PATCH 1/2] phy: ralink: Add PHY driver for MT7621 PCIe PHY Date: Thu, 14 Mar 2019 14:22:09 +0100 Message-Id: <20190314132210.654-2-sergio.paracuellos@gmail.com> X-Mailer: git-send-email 2.19.1 In-Reply-To: <20190314132210.654-1-sergio.paracuellos@gmail.com> References: <20190314132210.654-1-sergio.paracuellos@gmail.com> MIME-Version: 1.0 Sender: linux-mips-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-mips@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP This patch adds a driver for the PCIe PHY of MT7621 SoC. Signed-off-by: Sergio Paracuellos --- drivers/phy/ralink/Kconfig | 7 + drivers/phy/ralink/Makefile | 1 + drivers/phy/ralink/phy-mt7621-pci.c | 387 ++++++++++++++++++++++++++++ 3 files changed, 395 insertions(+) create mode 100644 drivers/phy/ralink/phy-mt7621-pci.c diff --git a/drivers/phy/ralink/Kconfig b/drivers/phy/ralink/Kconfig index 14fd219535ef..87943a10f210 100644 --- a/drivers/phy/ralink/Kconfig +++ b/drivers/phy/ralink/Kconfig @@ -1,6 +1,13 @@ # # PHY drivers for Ralink platforms. # +config PHY_MT7621_PCI + tristate "MediaTek MT7621 PCI PHY Driver" + depends on RALINK && OF + select GENERIC_PHY + help + Say 'Y' here to add support for MediaTek MT7621 PCI PHY driver, + config PHY_RALINK_USB tristate "Ralink USB PHY driver" depends on RALINK || COMPILE_TEST diff --git a/drivers/phy/ralink/Makefile b/drivers/phy/ralink/Makefile index 5c9e326e8757..2052d5649863 100644 --- a/drivers/phy/ralink/Makefile +++ b/drivers/phy/ralink/Makefile @@ -1 +1,2 @@ +obj-$(CONFIG_PHY_MT7621_PCI) += phy-mt7621-pci.o obj-$(CONFIG_PHY_RALINK_USB) += phy-ralink-usb.o diff --git a/drivers/phy/ralink/phy-mt7621-pci.c b/drivers/phy/ralink/phy-mt7621-pci.c new file mode 100644 index 000000000000..d3ca2f019112 --- /dev/null +++ b/drivers/phy/ralink/phy-mt7621-pci.c @@ -0,0 +1,387 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * Mediatek MT7621 PCI PHY Driver + * Author: Sergio Paracuellos + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#define RALINK_CLKCFG1 0x30 +#define CHIP_REV_MT7621_E2 0x0101 + +#define PCIE_PORT_CLK_EN(x) BIT(24 + (x)) + +#define RG_PE1_PIPE_REG 0x02c +#define RG_PE1_PIPE_RST BIT(12) +#define RG_PE1_PIPE_CMD_FRC BIT(4) + +#define RG_P0_TO_P1_WIDTH 0x100 +#define RG_PE1_H_LCDDS_REG 0x49c +#define RG_PE1_H_LCDDS_PCW GENMASK(30, 0) +#define RG_PE1_H_LCDDS_PCW_VAL(x) ((0x7fffffff & (x)) << 0) + +#define RG_PE1_FRC_H_XTAL_REG 0x400 +#define RG_PE1_FRC_H_XTAL_TYPE BIT(8) +#define RG_PE1_H_XTAL_TYPE GENMASK(10, 9) +#define RG_PE1_H_XTAL_TYPE_VAL(x) ((0x3 & (x)) << 9) + +#define RG_PE1_FRC_PHY_REG 0x000 +#define RG_PE1_FRC_PHY_EN BIT(4) +#define RG_PE1_PHY_EN BIT(5) + +#define RG_PE1_H_PLL_REG 0x490 +#define RG_PE1_H_PLL_BC GENMASK(23, 22) +#define RG_PE1_H_PLL_BC_VAL(x) ((0x3 & (x)) << 22) +#define RG_PE1_H_PLL_BP GENMASK(21, 18) +#define RG_PE1_H_PLL_BP_VAL(x) ((0xf & (x)) << 18) +#define RG_PE1_H_PLL_IR GENMASK(15, 12) +#define RG_PE1_H_PLL_IR_VAL(x) ((0xf & (x)) << 12) +#define RG_PE1_H_PLL_IC GENMASK(11, 8) +#define RG_PE1_H_PLL_IC_VAL(x) ((0xf & (x)) << 8) +#define RG_PE1_H_PLL_PREDIV GENMASK(7, 6) +#define RG_PE1_H_PLL_PREDIV_VAL(x) ((0x3 & (x)) << 6) +#define RG_PE1_PLL_DIVEN GENMASK(3, 1) +#define RG_PE1_PLL_DIVEN_VAL(x) ((0x7 & (x)) << 1) + +#define RG_PE1_H_PLL_FBKSEL_REG 0x4bc +#define RG_PE1_H_PLL_FBKSEL GENMASK(5, 4) +#define RG_PE1_H_PLL_FBKSEL_VAL(x) ((0x3 & (x)) << 4) + +#define RG_PE1_H_LCDDS_SSC_PRD_REG 0x4a4 +#define RG_PE1_H_LCDDS_SSC_PRD GENMASK(15, 0) +#define RG_PE1_H_LCDDS_SSC_PRD_VAL(x) ((0xffff & (x)) << 0) + +#define RG_PE1_H_LCDDS_SSC_DELTA_REG 0x4a8 +#define RG_PE1_H_LCDDS_SSC_DELTA GENMASK(11, 0) +#define RG_PE1_H_LCDDS_SSC_DELTA_VAL(x) ((0xfff & (x)) << 0) +#define RG_PE1_H_LCDDS_SSC_DELTA1 GENMASK(27, 16) +#define RG_PE1_H_LCDDS_SSC_DELTA1_VAL(x) ((0xff & (x)) << 16) + +#define RG_PE1_LCDDS_CLK_PH_INV_REG 0x4a0 +#define RG_PE1_LCDDS_CLK_PH_INV BIT(5) + +#define RG_PE1_H_PLL_BR_REG 0x4ac +#define RG_PE1_H_PLL_BR GENMASK(18, 16) +#define RG_PE1_H_PLL_BR_VAL(x) ((0x7 & (x)) << 16) + +#define RG_PE1_MSTCKDIV_REG 0x414 +#define RG_PE1_MSTCKDIV GENMASK(7, 6) +#define RG_PE1_MSTCKDIV_VAL(x) ((0x3 & (x)) << 6) + +#define RG_PE1_FRC_MSTCKDIV BIT(5) + +/** + * struct mt7621_pci_phy_instance - Mt7621 Pcie PHY device + * @phy: pointer to the kernel PHY device + * @port_base: base register + * @index: internal ID to identify the Mt7621 PCIe PHY + */ +struct mt7621_pci_phy_instance { + struct phy *phy; + void __iomem *port_base; + u32 index; +}; + +/** + * struct mt7621_pci_phy - Mt7621 Pcie PHY core + * @dev: pointer to device + * @phys: pointer to Mt7621 PHY device + * @nphys: number of PHY devices for this core + */ +struct mt7621_pci_phy { + struct device *dev; + struct mt7621_pci_phy_instance **phys; + int nphys; +}; + +static inline u32 phy_read(struct mt7621_pci_phy_instance *instance, u32 reg) +{ + return readl(instance->port_base + reg); +} + +static inline void phy_write(struct mt7621_pci_phy_instance *instance, + u32 val, u32 reg) +{ + writel(val, instance->port_base + reg); +} + +static void mt7621_bypass_pipe_rst(struct mt7621_pci_phy *phy, + struct mt7621_pci_phy_instance *instance) +{ + u32 offset = (instance->index != 1) ? + RG_PE1_PIPE_REG : RG_PE1_PIPE_REG + RG_P0_TO_P1_WIDTH; + u32 reg; + + reg = phy_read(instance, offset); + reg &= ~(RG_PE1_PIPE_RST | RG_PE1_PIPE_CMD_FRC); + reg |= (RG_PE1_PIPE_RST | RG_PE1_PIPE_CMD_FRC); + phy_write(instance, reg, offset); +} + +static void mt7621_set_phy_for_ssc(struct mt7621_pci_phy *phy, + struct mt7621_pci_phy_instance *instance) +{ + struct device *dev = phy->dev; + u32 reg = rt_sysc_r32(SYSC_REG_SYSTEM_CONFIG0); + u32 offset; + u32 val; + + reg = (reg >> 6) & 0x7; + /* Set PCIe Port PHY to disable SSC */ + /* Debug Xtal Type */ + val = phy_read(instance, RG_PE1_FRC_H_XTAL_REG); + val &= ~(RG_PE1_FRC_H_XTAL_TYPE | RG_PE1_H_XTAL_TYPE); + val |= RG_PE1_FRC_H_XTAL_TYPE; + val |= RG_PE1_H_XTAL_TYPE_VAL(0x00); + phy_write(instance, val, RG_PE1_FRC_H_XTAL_REG); + + /* disable port */ + offset = (instance->index != 1) ? + RG_PE1_FRC_PHY_REG : RG_PE1_FRC_PHY_REG + RG_P0_TO_P1_WIDTH; + val = phy_read(instance, offset); + val &= ~(RG_PE1_FRC_PHY_EN | RG_PE1_PHY_EN); + val |= RG_PE1_FRC_PHY_EN; + phy_write(instance, val, offset); + + /* Set Pre-divider ratio (for host mode) */ + val = phy_read(instance, RG_PE1_H_PLL_REG); + val &= ~(RG_PE1_H_PLL_PREDIV); + + if (reg <= 5 && reg >= 3) { /* 40MHz Xtal */ + val |= RG_PE1_H_PLL_PREDIV_VAL(0x01); + phy_write(instance, val, RG_PE1_H_PLL_REG); + dev_info(dev, "Xtal is 40MHz\n"); + } else { /* 25MHz | 20MHz Xtal */ + val |= RG_PE1_H_PLL_PREDIV_VAL(0x00); + phy_write(instance, val, RG_PE1_H_PLL_REG); + if (reg >= 6) { + dev_info(dev, "Xtal is 25MHz\n"); + + /* Select feedback clock */ + val = phy_read(instance, RG_PE1_H_PLL_FBKSEL_REG); + val &= ~(RG_PE1_H_PLL_FBKSEL); + val |= RG_PE1_H_PLL_FBKSEL_VAL(0x01); + phy_write(instance, val, RG_PE1_H_PLL_FBKSEL_REG); + + /* DDS NCPO PCW (for host mode) */ + val = phy_read(instance, RG_PE1_H_LCDDS_SSC_PRD_REG); + val &= ~(RG_PE1_H_LCDDS_SSC_PRD); + val |= RG_PE1_H_LCDDS_SSC_PRD_VAL(0x18000000); + phy_write(instance, val, RG_PE1_H_LCDDS_SSC_PRD_REG); + + /* DDS SSC dither period control */ + val = phy_read(instance, RG_PE1_H_LCDDS_SSC_PRD_REG); + val &= ~(RG_PE1_H_LCDDS_SSC_PRD); + val |= RG_PE1_H_LCDDS_SSC_PRD_VAL(0x18d); + phy_write(instance, val, RG_PE1_H_LCDDS_SSC_PRD_REG); + + /* DDS SSC dither amplitude control */ + val = phy_read(instance, RG_PE1_H_LCDDS_SSC_DELTA_REG); + val &= ~(RG_PE1_H_LCDDS_SSC_DELTA | + RG_PE1_H_LCDDS_SSC_DELTA1); + val |= RG_PE1_H_LCDDS_SSC_DELTA_VAL(0x4a); + val |= RG_PE1_H_LCDDS_SSC_DELTA1_VAL(0x4a); + phy_write(instance, val, RG_PE1_H_LCDDS_SSC_DELTA_REG); + } else { + dev_info(dev, "Xtal is 20MHz\n"); + } + } + + /* DDS clock inversion */ + val = phy_read(instance, RG_PE1_LCDDS_CLK_PH_INV_REG); + val &= ~(RG_PE1_LCDDS_CLK_PH_INV); + val |= RG_PE1_LCDDS_CLK_PH_INV; + phy_write(instance, val, RG_PE1_LCDDS_CLK_PH_INV_REG); + + /* Set PLL bits */ + val = phy_read(instance, RG_PE1_H_PLL_REG); + val &= ~(RG_PE1_H_PLL_BC | RG_PE1_H_PLL_BP | RG_PE1_H_PLL_IR | + RG_PE1_H_PLL_IC | RG_PE1_PLL_DIVEN); + val |= RG_PE1_H_PLL_BC_VAL(0x02); + val |= RG_PE1_H_PLL_BP_VAL(0x06); + val |= RG_PE1_H_PLL_IR_VAL(0x02); + val |= RG_PE1_H_PLL_IC_VAL(0x01); + val |= RG_PE1_PLL_DIVEN_VAL(0x02); + phy_write(instance, val, RG_PE1_H_PLL_REG); + + val = phy_read(instance, RG_PE1_H_PLL_BR_REG); + val &= ~(RG_PE1_H_PLL_BR); + val |= RG_PE1_H_PLL_BR_VAL(0x00); + phy_write(instance, val, RG_PE1_H_PLL_BR_REG); + + if (reg <= 5 && reg >= 3) { /* 40MHz Xtal */ + /* set force mode enable of da_pe1_mstckdiv */ + val = phy_read(instance, RG_PE1_MSTCKDIV_REG); + val &= ~(RG_PE1_MSTCKDIV | RG_PE1_FRC_MSTCKDIV); + val |= (RG_PE1_MSTCKDIV_VAL(0x01) | RG_PE1_FRC_MSTCKDIV); + phy_write(instance, val, RG_PE1_MSTCKDIV_REG); + } +} + +static int mt7621_pci_phy_init(struct phy *phy) +{ + struct mt7621_pci_phy_instance *instance = phy_get_drvdata(phy); + struct mt7621_pci_phy *mphy = dev_get_drvdata(phy->dev.parent); + u32 chip_rev_id = rt_sysc_r32(SYSC_REG_CHIP_REV); + + if ((chip_rev_id & 0xFFFF) == CHIP_REV_MT7621_E2) + mt7621_bypass_pipe_rst(mphy, instance); + + mt7621_set_phy_for_ssc(mphy, instance); + + return 0; +} + +static int mt7621_pci_phy_power_on(struct phy *phy) +{ + struct mt7621_pci_phy_instance *instance = phy_get_drvdata(phy); + u32 offset = (instance->index != 1) ? + RG_PE1_FRC_PHY_REG : RG_PE1_FRC_PHY_REG + RG_P0_TO_P1_WIDTH; + u32 val; + + /* Enable PHY and disable force mode */ + val = phy_read(instance, offset); + val &= ~(RG_PE1_FRC_PHY_EN | RG_PE1_PHY_EN); + val |= (RG_PE1_FRC_PHY_EN | RG_PE1_PHY_EN); + phy_write(instance, val, offset); + + return 0; +} + +static int mt7621_pci_phy_power_off(struct phy *phy) +{ + struct mt7621_pci_phy_instance *instance = phy_get_drvdata(phy); + u32 offset = (instance->index != 1) ? + RG_PE1_FRC_PHY_REG : RG_PE1_FRC_PHY_REG + RG_P0_TO_P1_WIDTH; + u32 val; + + /* Disable PHY */ + val = phy_read(instance, offset); + val &= ~(RG_PE1_FRC_PHY_EN | RG_PE1_PHY_EN); + val |= RG_PE1_FRC_PHY_EN; + phy_write(instance, val, offset); + + return 0; +} + +static int mt7621_pci_phy_exit(struct phy *phy) +{ + struct mt7621_pci_phy_instance *instance = phy_get_drvdata(phy); + + rt_sysc_m32(PCIE_PORT_CLK_EN(instance->index), 0, RALINK_CLKCFG1); + + return 0; +} + +static const struct phy_ops mt7621_pci_phy_ops = { + .init = mt7621_pci_phy_init, + .exit = mt7621_pci_phy_exit, + .power_on = mt7621_pci_phy_power_on, + .power_off = mt7621_pci_phy_power_off, + .owner = THIS_MODULE, +}; + +static int mt7621_pci_phy_probe(struct platform_device *pdev) +{ + struct device *dev = &pdev->dev; + struct device_node *np = dev->of_node; + struct device_node *child_np; + struct phy_provider *provider; + struct mt7621_pci_phy *phy; + struct resource res; + int port, ret; + void __iomem *port_base; + + phy = devm_kzalloc(dev, sizeof(*phy), GFP_KERNEL); + if (!phy) + return -ENOMEM; + + phy->nphys = of_get_child_count(np); + phy->phys = devm_kcalloc(dev, phy->nphys, + sizeof(*phy->phys), GFP_KERNEL); + if (!phy->phys) + return -ENOMEM; + + phy->dev = dev; + platform_set_drvdata(pdev, phy); + + ret = of_address_to_resource(np, 0, &res); + if (ret) { + dev_err(dev, "failed to get address resource(id-%d)\n", port); + return ret; + } + + port_base = devm_ioremap_resource(dev, &res); + if (IS_ERR(port_base)) { + dev_err(dev, "failed to remap phy regs\n"); + return PTR_ERR(port_base); + } + + port = 0; + for_each_child_of_node(np, child_np) { + struct mt7621_pci_phy_instance *instance; + struct phy *pphy; + + instance = devm_kzalloc(dev, sizeof(*instance), GFP_KERNEL); + if (!instance) { + ret = -ENOMEM; + goto put_child; + } + + phy->phys[port] = instance; + + pphy = devm_phy_create(dev, child_np, &mt7621_pci_phy_ops); + if (IS_ERR(phy)) { + dev_err(dev, "failed to create phy\n"); + ret = PTR_ERR(phy); + goto put_child; + } + + instance->port_base = port_base; + instance->phy = pphy; + instance->index = port; + phy_set_drvdata(pphy, instance); + port++; + } + + provider = devm_of_phy_provider_register(dev, of_phy_simple_xlate); + + return PTR_ERR_OR_ZERO(provider); + +put_child: + of_node_put(child_np); + return ret; +} + +static const struct of_device_id mt7621_pci_phy_ids[] = { + { .compatible = "mediatek,mt7621-pci-phy" }, + {}, +}; +MODULE_DEVICE_TABLE(of, mt7621_pci_ids); + +static struct platform_driver mt7621_pci_phy_driver = { + .probe = mt7621_pci_phy_probe, + .driver = { + .name = "mt7621-pci-phy", + .of_match_table = of_match_ptr(mt7621_pci_phy_ids), + }, +}; + +static int __init mt7621_pci_phy_drv_init(void) +{ + return platform_driver_register(&mt7621_pci_phy_driver); +} + +module_init(mt7621_pci_phy_drv_init); + +MODULE_AUTHOR("Sergio Paracuellos "); +MODULE_DESCRIPTION("MediaTek MT7621 PCIe PHY driver"); +MODULE_LICENSE("GPL v2");