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Message-Id: <EOC0HQ.DRQCDU2E1XFG3@crapouillou.net>
Date:   Mon, 21 Sep 2020 14:14:38 +0200
From:   Paul Cercueil <paul@...pouillou.net>
To:     周琰杰 <zhouyanjie@...yeetech.com>
Cc:     balbi@...nel.org, gregkh@...uxfoundation.org, kishon@...com,
        vkoul@...nel.org, linux-kernel@...r.kernel.org,
        linux-usb@...r.kernel.org, christophe.jaillet@...adoo.fr,
        dongsheng.qiu@...enic.com, aric.pzqi@...enic.com,
        rick.tyliu@...enic.com, yanfei.li@...enic.com,
        sernia.zhou@...mail.com, zhenwenjin@...il.com
Subject: Re: [PATCH v4 2/2] PHY: Ingenic: Add USB PHY driver using generic PHY
 framework.

Hi Zhou,

Le sam. 19 sept. 2020 à 16:42, 周琰杰 (Zhou Yanjie) 
<zhouyanjie@...yeetech.com> a écrit :
> Used the generic PHY framework API to create the PHY, this driver
> supoorts USB OTG PHY used in JZ4770 SoC, JZ4780 SoC, X1000 SoC,
> and X1830 SoC.
> 
> Tested-by: 周正 (Zhou Zheng) <sernia.zhou@...mail.com>
> Co-developed-by: 漆鹏振 (Qi Pengzhen) <aric.pzqi@...enic.com>
> Signed-off-by: 漆鹏振 (Qi Pengzhen) <aric.pzqi@...enic.com>
> Signed-off-by: 周琰杰 (Zhou Yanjie) <zhouyanjie@...yeetech.com>
> ---
> 
> Notes:
>     v1->v2:
>     Fix bug, ".of_match_table = 
> of_match_ptr(ingenic_usb_phy_of_matches)" is wrong
>     and should be replaced with ".of_match_table = 
> ingenic_usb_phy_of_matches".
> 
>     v2->v3:
>     1.Change "depends on (MACH_INGENIC && MIPS) || COMPILE_TEST" to
>       "depends on MIPS || COMPILE_TEST".
>     2.Keep the adjustments of "ingenic_usb_phy_init()" and 
> "ingenic_usb_phu_exit()"
>       positions in v2 to make them consistent with the order in 
> "ingenic_usb_phy_ops",
>       keep the adjustments to the positions of 
> "ingenic_usb_phy_of_matches[]" in v2
>       to keep them consistent with the styles of other USB PHY 
> drivers. And remove
>       some unnecessary changes to reduce the diff size, from the 
> original 256 lines
>       change to the current 209 lines.
> 
>     v3->v4:
>     Only add new generic-PHY driver, without removing the old one. 
> Because the
>     jz4740-musb driver is not ready to use the generic PHY framework. 
> When the
>     jz4740-musb driver is modified to use the generic PHY framework, 
> the old
>     jz4770-phy driver can be "retired".
> 
>  drivers/phy/Kconfig                   |   1 +
>  drivers/phy/Makefile                  |   1 +
>  drivers/phy/ingenic/Kconfig           |  12 ++
>  drivers/phy/ingenic/Makefile          |   2 +
>  drivers/phy/ingenic/phy-ingenic-usb.c | 373 
> ++++++++++++++++++++++++++++++++++
>  5 files changed, 389 insertions(+)
>  create mode 100644 drivers/phy/ingenic/Kconfig
>  create mode 100644 drivers/phy/ingenic/Makefile
>  create mode 100644 drivers/phy/ingenic/phy-ingenic-usb.c
> 
> diff --git a/drivers/phy/Kconfig b/drivers/phy/Kconfig
> index de9362c25c07..0534b0fdd057 100644
> --- a/drivers/phy/Kconfig
> +++ b/drivers/phy/Kconfig
> @@ -55,6 +55,7 @@ source "drivers/phy/broadcom/Kconfig"
>  source "drivers/phy/cadence/Kconfig"
>  source "drivers/phy/freescale/Kconfig"
>  source "drivers/phy/hisilicon/Kconfig"
> +source "drivers/phy/ingenic/Kconfig"
>  source "drivers/phy/lantiq/Kconfig"
>  source "drivers/phy/marvell/Kconfig"
>  source "drivers/phy/mediatek/Kconfig"
> diff --git a/drivers/phy/Makefile b/drivers/phy/Makefile
> index c27408e4daae..ab24f0d20763 100644
> --- a/drivers/phy/Makefile
> +++ b/drivers/phy/Makefile
> @@ -14,6 +14,7 @@ obj-y					+= allwinner/	\
>  					   cadence/	\
>  					   freescale/	\
>  					   hisilicon/	\
> +					   ingenic/	\
>  					   intel/	\
>  					   lantiq/	\
>  					   marvell/	\
> diff --git a/drivers/phy/ingenic/Kconfig b/drivers/phy/ingenic/Kconfig
> new file mode 100644
> index 000000000000..912b14e512cb
> --- /dev/null
> +++ b/drivers/phy/ingenic/Kconfig
> @@ -0,0 +1,12 @@
> +# SPDX-License-Identifier: GPL-2.0
> +#
> +# Phy drivers for Ingenic platforms
> +#
> +config PHY_INGENIC_USB
> +	tristate "Ingenic SoCs USB PHY Driver"
> +	depends on MIPS || COMPILE_TEST
> +	depends on USB_SUPPORT
> +	select GENERIC_PHY
> +	help
> +	  This driver provides USB PHY support for the USB controller found
> +	  on the JZ-series and X-series SoCs from Ingenic.
> diff --git a/drivers/phy/ingenic/Makefile 
> b/drivers/phy/ingenic/Makefile
> new file mode 100644
> index 000000000000..65d5ea00fc9d
> --- /dev/null
> +++ b/drivers/phy/ingenic/Makefile
> @@ -0,0 +1,2 @@
> +# SPDX-License-Identifier: GPL-2.0
> +obj-y		+= phy-ingenic-usb.o
> diff --git a/drivers/phy/ingenic/phy-ingenic-usb.c 
> b/drivers/phy/ingenic/phy-ingenic-usb.c
> new file mode 100644
> index 000000000000..f220750e7950
> --- /dev/null
> +++ b/drivers/phy/ingenic/phy-ingenic-usb.c
> @@ -0,0 +1,373 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * Ingenic SoCs USB PHY driver
> + * Copyright (c) Paul Cercueil <paul@...pouillou.net>
> + * Copyright (c) 漆鹏振 (Qi Pengzhen) <aric.pzqi@...enic.com>
> + * Copyright (c) 周琰杰 (Zhou Yanjie) <zhouyanjie@...yeetech.com>
> + */
> +
> +#include <linux/clk.h>
> +#include <linux/delay.h>
> +#include <linux/io.h>
> +#include <linux/module.h>
> +#include <linux/phy/phy.h>
> +#include <linux/platform_device.h>
> +#include <linux/regulator/consumer.h>
> +
> +/* OTGPHY register offsets */
> +#define REG_USBPCR_OFFSET			0x00
> +#define REG_USBRDT_OFFSET			0x04
> +#define REG_USBVBFIL_OFFSET			0x08
> +#define REG_USBPCR1_OFFSET			0x0c
> +
> +/* bits within the USBPCR register */
> +#define USBPCR_USB_MODE				BIT(31)
> +#define USBPCR_AVLD_REG				BIT(30)
> +#define USBPCR_COMMONONN			BIT(25)
> +#define USBPCR_VBUSVLDEXT			BIT(24)
> +#define USBPCR_VBUSVLDEXTSEL		BIT(23)
> +#define USBPCR_POR					BIT(22)
> +#define USBPCR_SIDDQ				BIT(21)
> +#define USBPCR_OTG_DISABLE			BIT(20)
> +#define USBPCR_TXPREEMPHTUNE		BIT(6)
> +
> +#define USBPCR_IDPULLUP_LSB	28
> +#define USBPCR_IDPULLUP_MASK		GENMASK(29, USBPCR_IDPULLUP_LSB)
> +#define USBPCR_IDPULLUP_ALWAYS		(0x2 << USBPCR_IDPULLUP_LSB)
> +#define USBPCR_IDPULLUP_SUSPEND		(0x1 << USBPCR_IDPULLUP_LSB)
> +#define USBPCR_IDPULLUP_OTG			(0x0 << USBPCR_IDPULLUP_LSB)
> +
> +#define USBPCR_COMPDISTUNE_LSB		17
> +#define USBPCR_COMPDISTUNE_MASK		GENMASK(19, USBPCR_COMPDISTUNE_LSB)
> +#define USBPCR_COMPDISTUNE_DFT		(0x4 << USBPCR_COMPDISTUNE_LSB)
> +
> +#define USBPCR_OTGTUNE_LSB			14
> +#define USBPCR_OTGTUNE_MASK			GENMASK(16, USBPCR_OTGTUNE_LSB)
> +#define USBPCR_OTGTUNE_DFT			(0x4 << USBPCR_OTGTUNE_LSB)
> +
> +#define USBPCR_SQRXTUNE_LSB	11
> +#define USBPCR_SQRXTUNE_MASK		GENMASK(13, USBPCR_SQRXTUNE_LSB)
> +#define USBPCR_SQRXTUNE_DCR_20PCT	(0x7 << USBPCR_SQRXTUNE_LSB)
> +#define USBPCR_SQRXTUNE_DFT			(0x3 << USBPCR_SQRXTUNE_LSB)
> +
> +#define USBPCR_TXFSLSTUNE_LSB		7
> +#define USBPCR_TXFSLSTUNE_MASK		GENMASK(10, USBPCR_TXFSLSTUNE_LSB)
> +#define USBPCR_TXFSLSTUNE_DCR_50PPT	(0xf << USBPCR_TXFSLSTUNE_LSB)
> +#define USBPCR_TXFSLSTUNE_DCR_25PPT	(0x7 << USBPCR_TXFSLSTUNE_LSB)
> +#define USBPCR_TXFSLSTUNE_DFT		(0x3 << USBPCR_TXFSLSTUNE_LSB)
> +#define USBPCR_TXFSLSTUNE_INC_25PPT	(0x1 << USBPCR_TXFSLSTUNE_LSB)
> +#define USBPCR_TXFSLSTUNE_INC_50PPT	(0x0 << USBPCR_TXFSLSTUNE_LSB)
> +
> +#define USBPCR_TXHSXVTUNE_LSB		4
> +#define USBPCR_TXHSXVTUNE_MASK		GENMASK(5, USBPCR_TXHSXVTUNE_LSB)
> +#define USBPCR_TXHSXVTUNE_DFT		(0x3 << USBPCR_TXHSXVTUNE_LSB)
> +#define USBPCR_TXHSXVTUNE_DCR_15MV	(0x1 << USBPCR_TXHSXVTUNE_LSB)
> +
> +#define USBPCR_TXRISETUNE_LSB		4
> +#define USBPCR_TXRISETUNE_MASK		GENMASK(5, USBPCR_TXRISETUNE_LSB)
> +#define USBPCR_TXRISETUNE_DFT		(0x3 << USBPCR_TXRISETUNE_LSB)
> +
> +#define USBPCR_TXVREFTUNE_LSB		0
> +#define USBPCR_TXVREFTUNE_MASK		GENMASK(3, USBPCR_TXVREFTUNE_LSB)
> +#define USBPCR_TXVREFTUNE_INC_25PPT	(0x7 << USBPCR_TXVREFTUNE_LSB)
> +#define USBPCR_TXVREFTUNE_DFT		(0x5 << USBPCR_TXVREFTUNE_LSB)
> +
> +/* bits within the USBRDTR register */
> +#define USBRDT_UTMI_RST				BIT(27)
> +#define USBRDT_HB_MASK				BIT(26)
> +#define USBRDT_VBFIL_LD_EN			BIT(25)
> +#define USBRDT_IDDIG_EN				BIT(24)
> +#define USBRDT_IDDIG_REG			BIT(23)
> +#define USBRDT_VBFIL_EN				BIT(2)
> +
> +/* bits within the USBPCR1 register */
> +#define USBPCR1_BVLD_REG			BIT(31)
> +#define USBPCR1_DPPD				BIT(29)
> +#define USBPCR1_DMPD				BIT(28)
> +#define USBPCR1_USB_SEL				BIT(28)
> +#define USBPCR1_WORD_IF_16BIT		BIT(19)
> +
> +enum ingenic_usb_phy_version {
> +	ID_JZ4770,
> +	ID_JZ4780,
> +	ID_X1000,
> +	ID_X1830,
> +};
> +
> +struct ingenic_soc_info {
> +	enum ingenic_usb_phy_version version;
> +
> +	void (*usb_phy_init)(struct phy *phy);
> +};
> +
> +struct ingenic_usb_phy {
> +	const struct ingenic_soc_info *soc_info;
> +
> +	struct phy *phy;
> +	struct device *dev;
> +	void __iomem *base;
> +	struct clk *clk;
> +	struct regulator *vcc_supply;
> +};
> +
> +static int ingenic_usb_phy_init(struct phy *phy)
> +{
> +	struct ingenic_usb_phy *priv = phy_get_drvdata(phy);
> +	int err;
> +	u32 reg;
> +
> +	err = clk_prepare_enable(priv->clk);
> +	if (err) {
> +		dev_err(priv->dev, "Unable to start clock: %d\n", err);
> +		return err;
> +	}
> +
> +	priv->soc_info->usb_phy_init(phy);
> +
> +	/* Wait for PHY to reset */
> +	usleep_range(30, 300);
> +	reg = readl(priv->base + REG_USBPCR_OFFSET);
> +	writel(reg & ~USBPCR_POR, priv->base + REG_USBPCR_OFFSET);
> +	usleep_range(300, 1000);
> +
> +	return 0;
> +}
> +
> +static int ingenic_usb_phy_exit(struct phy *phy)
> +{
> +	struct ingenic_usb_phy *priv = phy_get_drvdata(phy);
> +
> +	clk_disable_unprepare(priv->clk);
> +	regulator_disable(priv->vcc_supply);
> +
> +	return 0;
> +}
> +
> +static int ingenic_usb_phy_power_on(struct phy *phy)
> +{
> +	struct ingenic_usb_phy *priv = phy_get_drvdata(phy);
> +	int err;
> +
> +	err = regulator_enable(priv->vcc_supply);
> +	if (err) {
> +		dev_err(priv->dev, "Unable to enable VCC: %d\n", err);
> +		return err;
> +	}
> +
> +	return 0;
> +}
> +
> +static int ingenic_usb_phy_power_off(struct phy *phy)
> +{
> +	struct ingenic_usb_phy *priv = phy_get_drvdata(phy);
> +
> +	regulator_disable(priv->vcc_supply);
> +
> +	return 0;
> +}
> +
> +static int ingenic_usb_phy_set_mode(struct phy *phy,
> +				  enum phy_mode mode, int submode)
> +{
> +	struct ingenic_usb_phy *priv = phy_get_drvdata(phy);
> +	u32 reg;
> +
> +	switch (mode) {
> +	case PHY_MODE_USB_HOST:
> +		reg = readl(priv->base + REG_USBPCR_OFFSET);
> +		reg &= ~(USBPCR_VBUSVLDEXT | USBPCR_VBUSVLDEXTSEL | 
> USBPCR_OTG_DISABLE);
> +		reg |= USBPCR_USB_MODE;
> +		writel(reg, priv->base + REG_USBPCR_OFFSET);
> +
> +		break;
> +	case PHY_MODE_USB_DEVICE:
> +		if (priv->soc_info->version >= ID_X1000) {
> +			reg = readl(priv->base + REG_USBPCR1_OFFSET);
> +			reg |= USBPCR1_BVLD_REG;
> +			writel(reg, priv->base + REG_USBPCR1_OFFSET);
> +		}
> +
> +		reg = readl(priv->base + REG_USBPCR_OFFSET);
> +		reg &= ~USBPCR_USB_MODE;
> +		reg |= USBPCR_VBUSVLDEXT | USBPCR_VBUSVLDEXTSEL | 
> USBPCR_OTG_DISABLE;
> +		writel(reg, priv->base + REG_USBPCR_OFFSET);
> +
> +		break;
> +	case PHY_MODE_USB_OTG:
> +		reg = readl(priv->base + REG_USBPCR_OFFSET);
> +		reg &= ~USBPCR_OTG_DISABLE;
> +		reg |= USBPCR_VBUSVLDEXT | USBPCR_VBUSVLDEXTSEL | USBPCR_USB_MODE;
> +		writel(reg, priv->base + REG_USBPCR_OFFSET);
> +
> +		break;
> +	default:
> +		return -EINVAL;
> +	}
> +
> +	return 0;
> +}
> +
> +static const struct phy_ops ingenic_usb_phy_ops = {
> +	.init		= ingenic_usb_phy_init,
> +	.exit		= ingenic_usb_phy_exit,
> +	.power_on	= ingenic_usb_phy_power_on,
> +	.power_off	= ingenic_usb_phy_power_off,
> +	.set_mode	= ingenic_usb_phy_set_mode,
> +	.owner		= THIS_MODULE,
> +};
> +
> +static void jz4770_usb_phy_init(struct phy *phy)
> +{
> +	struct ingenic_usb_phy *priv = phy_get_drvdata(phy);
> +	u32 reg;
> +
> +	reg = USBPCR_AVLD_REG | USBPCR_COMMONONN | USBPCR_IDPULLUP_ALWAYS |
> +		USBPCR_COMPDISTUNE_DFT | USBPCR_OTGTUNE_DFT | USBPCR_SQRXTUNE_DFT |
> +		USBPCR_TXFSLSTUNE_DFT | USBPCR_TXRISETUNE_DFT | 
> USBPCR_TXVREFTUNE_DFT |
> +		USBPCR_POR;
> +	writel(reg, priv->base + REG_USBPCR_OFFSET);
> +}
> +
> +static void jz4780_usb_phy_init(struct phy *phy)
> +{
> +	struct ingenic_usb_phy *priv = phy_get_drvdata(phy);
> +	u32 reg;
> +
> +	reg = readl(priv->base + REG_USBPCR1_OFFSET) | USBPCR1_USB_SEL |
> +		USBPCR1_WORD_IF_16BIT;
> +	writel(reg, priv->base + REG_USBPCR1_OFFSET);
> +
> +	reg = USBPCR_TXPREEMPHTUNE | USBPCR_COMMONONN | USBPCR_POR;
> +	writel(reg, priv->base + REG_USBPCR_OFFSET);
> +}
> +
> +static void x1000_usb_phy_init(struct phy *phy)
> +{
> +	struct ingenic_usb_phy *priv = phy_get_drvdata(phy);
> +	u32 reg;
> +
> +	reg = readl(priv->base + REG_USBPCR1_OFFSET) | 
> USBPCR1_WORD_IF_16BIT;
> +	writel(reg, priv->base + REG_USBPCR1_OFFSET);
> +
> +	reg = USBPCR_SQRXTUNE_DCR_20PCT | USBPCR_TXPREEMPHTUNE |
> +		USBPCR_TXHSXVTUNE_DCR_15MV | USBPCR_TXVREFTUNE_INC_25PPT |
> +		USBPCR_COMMONONN | USBPCR_POR;
> +	writel(reg, priv->base + REG_USBPCR_OFFSET);
> +}
> +
> +static void x1830_usb_phy_init(struct phy *phy)
> +{
> +	struct ingenic_usb_phy *priv = phy_get_drvdata(phy);
> +	u32 reg;
> +
> +	/* rdt */
> +	writel(USBRDT_VBFIL_EN | USBRDT_UTMI_RST, priv->base + 
> REG_USBRDT_OFFSET);
> +
> +	reg = readl(priv->base + REG_USBPCR1_OFFSET) | 
> USBPCR1_WORD_IF_16BIT |
> +		USBPCR1_DMPD | USBPCR1_DPPD;
> +	writel(reg, priv->base + REG_USBPCR1_OFFSET);
> +
> +	reg = USBPCR_IDPULLUP_OTG | USBPCR_VBUSVLDEXT 
> |	USBPCR_TXPREEMPHTUNE |
> +		USBPCR_COMMONONN | USBPCR_POR;
> +	writel(reg, priv->base + REG_USBPCR_OFFSET);
> +}
> +
> +static const struct ingenic_soc_info jz4770_soc_info = {
> +	.version = ID_JZ4770,
> +
> +	.usb_phy_init = jz4770_usb_phy_init,
> +};
> +
> +static const struct ingenic_soc_info jz4780_soc_info = {
> +	.version = ID_JZ4780,
> +
> +	.usb_phy_init = jz4780_usb_phy_init,
> +};
> +
> +static const struct ingenic_soc_info x1000_soc_info = {
> +	.version = ID_X1000,
> +
> +	.usb_phy_init = x1000_usb_phy_init,
> +};
> +
> +static const struct ingenic_soc_info x1830_soc_info = {
> +	.version = ID_X1830,
> +
> +	.usb_phy_init = x1830_usb_phy_init,
> +};
> +
> +static int ingenic_usb_phy_probe(struct platform_device *pdev)
> +{
> +	struct ingenic_usb_phy *priv;
> +	struct phy_provider *provider;
> +	struct device *dev = &pdev->dev;
> +	int err;
> +
> +	priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
> +	if (!priv)
> +		return -ENOMEM;
> +
> +	priv->soc_info = device_get_match_data(dev);
> +	if (!priv->soc_info) {
> +		dev_err(dev, "Error: No device match found\n");
> +		return -ENODEV;
> +	}
> +
> +	platform_set_drvdata(pdev, priv);
> +	priv->dev = dev;
> +
> +	priv->base = devm_platform_ioremap_resource(pdev, 0);
> +	if (IS_ERR(priv->base)) {
> +		dev_err(dev, "Failed to map registers\n");
> +		return PTR_ERR(priv->base);
> +	}
> +
> +	priv->clk = devm_clk_get(dev, NULL);
> +	if (IS_ERR(priv->clk)) {
> +		err = PTR_ERR(priv->clk);
> +		if (err != -EPROBE_DEFER)
> +			dev_err(dev, "Failed to get clock\n");
> +		return err;
> +	}
> +
> +	priv->vcc_supply = devm_regulator_get(dev, "vcc");
> +	if (IS_ERR(priv->vcc_supply)) {
> +		err = PTR_ERR(priv->vcc_supply);
> +		if (err != -EPROBE_DEFER)
> +			dev_err(dev, "Failed to get regulator\n");
> +		return err;
> +	}
> +
> +	priv->phy = devm_phy_create(dev, NULL, &ingenic_usb_phy_ops);
> +	if (IS_ERR(priv))
> +		return PTR_ERR(priv);
> +
> +	phy_set_drvdata(priv->phy, priv);

You can remove this, since you have the platform_set_drvdata(), and 
priv->phy->dev == &pdev->dev. phy_get_drvdata() will still work.

> +
> +	provider = devm_of_phy_provider_register(dev, of_phy_simple_xlate);

Add an extra blank line here and it will look perfect to me.

With the above fixed:
Reviewed-by: Paul Cercueil <paul@...pouillou.net>

Good job!

Cheers,
-Paul

> +	return PTR_ERR_OR_ZERO(provider);
> +}
> +
> +static const struct of_device_id ingenic_usb_phy_of_matches[] = {
> +	{ .compatible = "ingenic,jz4770-phy", .data = &jz4770_soc_info },
> +	{ .compatible = "ingenic,jz4780-phy", .data = &jz4780_soc_info },
> +	{ .compatible = "ingenic,x1000-phy", .data = &x1000_soc_info },
> +	{ .compatible = "ingenic,x1830-phy", .data = &x1830_soc_info },
> +	{ /* sentinel */ }
> +};
> +MODULE_DEVICE_TABLE(of, ingenic_usb_phy_of_matches);
> +
> +static struct platform_driver ingenic_usb_phy_driver = {
> +	.probe		= ingenic_usb_phy_probe,
> +	.driver		= {
> +		.name	= "ingenic-usb-phy",
> +		.of_match_table = ingenic_usb_phy_of_matches,
> +	},
> +};
> +module_platform_driver(ingenic_usb_phy_driver);
> +
> +MODULE_AUTHOR("周琰杰 (Zhou Yanjie) <zhouyanjie@...yeetech.com>");
> +MODULE_AUTHOR("漆鹏振 (Qi Pengzhen) <aric.pzqi@...enic.com>");
> +MODULE_AUTHOR("Paul Cercueil <paul@...pouillou.net>");
> +MODULE_DESCRIPTION("Ingenic SoCs USB PHY driver");
> +MODULE_LICENSE("GPL");
> --
> 2.11.0
> 


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