Re: [PATCH v2 2/2] phy: add NXP PTN3222 eUSB2 to USB2 redriver

[Stephan Gerhold <stephan.gerhold@linaro.org>]

On Fri, Aug 30, 2024 at 11:20:46AM +0300, Dmitry Baryshkov wrote:
> The NXP PTN3222 is the single-port eUSB2 to USB2 redriver that performs
> translation between eUSB2 and USB2 signalling schemes. It supports all
> three data rates: Low Speed, Full Speed and High Speed.
> 
> The reset state enables autonegotiation of the PHY role and of the data
> rate, so no additional programming is required.
> 
> Reviewed-by: Neil Armstrong <neil.armstrong@linaro.org>
> Tested-by: Konrad Dybcio <konradybcio@kernel.org>
> Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>

This works well for the USB fingerprint reader on the Qualcomm X1E80100
CRD. Thanks a lot for the clean driver :-)

Reviewed-by: Stephan Gerhold <stephan.gerhold@linaro.org>
Tested-by: Stephan Gerhold <stephan.gerhold@linaro.org>

> ---
>  drivers/phy/Kconfig           |  11 ++++
>  drivers/phy/Makefile          |   1 +
>  drivers/phy/phy-nxp-ptn3222.c | 123 ++++++++++++++++++++++++++++++++++++++++++
>  3 files changed, 135 insertions(+)
> 
> diff --git a/drivers/phy/Kconfig b/drivers/phy/Kconfig
> index dfab1c66b3e5..cb06a7f79740 100644
> --- a/drivers/phy/Kconfig
> +++ b/drivers/phy/Kconfig
> @@ -82,6 +82,17 @@ config PHY_AIROHA_PCIE
>  	  This driver create the basic PHY instance and provides initialize
>  	  callback for PCIe GEN3 port.
>  
> +config PHY_NXP_PTN3222
> +	tristate "NXP PTN3222 1-port eUSB2 to USB2 redriver"
> +	depends on I2C
> +	depends on OF
> +	select GENERIC_PHY
> +	help
> +	  Enable this to support NXP PTN3222 1-port eUSB2 to USB2 Redriver.
> +	  This redriver performs translation between eUSB2 and USB2 signalling
> +	  schemes. It supports all three USB 2.0 data rates: Low Speed, Full
> +	  Speed and High Speed.
> +
>  source "drivers/phy/allwinner/Kconfig"
>  source "drivers/phy/amlogic/Kconfig"
>  source "drivers/phy/broadcom/Kconfig"
> diff --git a/drivers/phy/Makefile b/drivers/phy/Makefile
> index 5fcbce5f9ab1..b64247046575 100644
> --- a/drivers/phy/Makefile
> +++ b/drivers/phy/Makefile
> @@ -11,6 +11,7 @@ obj-$(CONFIG_PHY_XGENE)			+= phy-xgene.o
>  obj-$(CONFIG_PHY_PISTACHIO_USB)		+= phy-pistachio-usb.o
>  obj-$(CONFIG_USB_LGM_PHY)		+= phy-lgm-usb.o
>  obj-$(CONFIG_PHY_AIROHA_PCIE)		+= phy-airoha-pcie.o
> +obj-$(CONFIG_PHY_NXP_PTN3222)		+= phy-nxp-ptn3222.o
>  obj-y					+= allwinner/	\
>  					   amlogic/	\
>  					   broadcom/	\
> diff --git a/drivers/phy/phy-nxp-ptn3222.c b/drivers/phy/phy-nxp-ptn3222.c
> new file mode 100644
> index 000000000000..c6179d8701e6
> --- /dev/null
> +++ b/drivers/phy/phy-nxp-ptn3222.c
> @@ -0,0 +1,123 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * Copyright (c) 2024, Linaro Limited
> + */
> +
> +#include <linux/gpio/consumer.h>
> +#include <linux/i2c.h>
> +#include <linux/module.h>
> +#include <linux/of.h>
> +#include <linux/phy/phy.h>
> +#include <linux/regmap.h>
> +#include <linux/regulator/consumer.h>
> +
> +#define NUM_SUPPLIES 2
> +
> +struct ptn3222 {
> +	struct i2c_client *client;
> +	struct phy *phy;
> +	struct gpio_desc *reset_gpio;
> +	struct regulator_bulk_data *supplies;
> +};
> +
> +static int ptn3222_init(struct phy *phy)
> +{
> +	struct ptn3222 *ptn3222 = phy_get_drvdata(phy);
> +	int ret;
> +
> +	ret = regulator_bulk_enable(NUM_SUPPLIES, ptn3222->supplies);
> +	if (ret)
> +		return ret;
> +
> +	gpiod_set_value_cansleep(ptn3222->reset_gpio, 0);
> +
> +	return 0;
> +}
> +
> +static int ptn3222_exit(struct phy *phy)
> +{
> +	struct ptn3222 *ptn3222 = phy_get_drvdata(phy);
> +
> +	gpiod_set_value_cansleep(ptn3222->reset_gpio, 1);
> +
> +	return regulator_bulk_disable(NUM_SUPPLIES, ptn3222->supplies);
> +}
> +
> +static const struct phy_ops ptn3222_ops = {
> +	.init		= ptn3222_init,
> +	.exit		= ptn3222_exit,
> +	.owner		= THIS_MODULE,
> +};
> +
> +static const struct regulator_bulk_data ptn3222_supplies[NUM_SUPPLIES] = {
> +	{
> +		.supply = "vdd3v3",
> +		.init_load_uA = 11000,
> +	}, {
> +		.supply = "vdd1v8",
> +		.init_load_uA = 55000,
> +	}
> +};
> +
> +static int ptn3222_probe(struct i2c_client *client)
> +{
> +	struct device *dev = &client->dev;
> +	struct phy_provider *phy_provider;
> +	struct ptn3222 *ptn3222;
> +	int ret;
> +
> +	ptn3222 = devm_kzalloc(dev, sizeof(*ptn3222), GFP_KERNEL);
> +	if (!ptn3222)
> +		return -ENOMEM;
> +
> +	ptn3222->client = client;
> +
> +	ptn3222->reset_gpio = devm_gpiod_get_optional(dev, "reset",
> +						      GPIOD_OUT_HIGH);
> +	if (IS_ERR(ptn3222->reset_gpio))
> +		return dev_err_probe(dev, PTR_ERR(ptn3222->reset_gpio),
> +				     "unable to acquire reset gpio\n");
> +
> +	ret = devm_regulator_bulk_get_const(dev, NUM_SUPPLIES, ptn3222_supplies,
> +					    &ptn3222->supplies);
> +	if (ret)
> +		return ret;
> +
> +	ptn3222->phy = devm_phy_create(dev, dev->of_node, &ptn3222_ops);
> +	if (IS_ERR(ptn3222->phy)) {
> +		dev_err(dev, "failed to create PHY: %d\n", ret);
> +		return PTR_ERR(ptn3222->phy);
> +	}
> +
> +	phy_set_drvdata(ptn3222->phy, ptn3222);
> +
> +	phy_provider = devm_of_phy_provider_register(dev, of_phy_simple_xlate);
> +
> +	return PTR_ERR_OR_ZERO(phy_provider);
> +}
> +
> +static const struct i2c_device_id ptn3222_table[] = {
> +	{ "ptn3222" },
> +	{ }
> +};
> +MODULE_DEVICE_TABLE(i2c, ptn3222_table);
> +
> +static const struct of_device_id ptn3222_of_table[] = {
> +	{ .compatible = "nxp,ptn3222" },
> +	{ }
> +};
> +MODULE_DEVICE_TABLE(of, ptn3222_of_table);
> +
> +static struct i2c_driver ptn3222_driver = {
> +	.driver = {
> +		.name = "ptn3222",
> +		.of_match_table = ptn3222_of_table,
> +	},
> +	.probe = ptn3222_probe,
> +	.id_table = ptn3222_table,
> +};
> +
> +module_i2c_driver(ptn3222_driver);
> +
> +MODULE_DESCRIPTION("NXP PTN3222 eUSB2 Redriver driver");
> +MODULE_LICENSE("GPL");
> 
> -- 
> 2.39.2
>