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Message-ID: <6fcaa893-70a4-44f4-afc0-853799e30774@quicinc.com>
Date: Sat, 31 Aug 2024 07:13:07 +0800
From: Song Xue <quic_songxue@...cinc.com>
To: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>,
Vinod Koul
<vkoul@...nel.org>,
Kishon Vijay Abraham I <kishon@...nel.org>,
Rob Herring
<robh@...nel.org>,
Krzysztof Kozlowski <krzk+dt@...nel.org>,
Conor Dooley
<conor+dt@...nel.org>
CC: Konrad Dybcio <konradybcio@...nel.org>, <linux-phy@...ts.infradead.org>,
<devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
<linux-arm-msm@...r.kernel.org>,
Neil Armstrong <neil.armstrong@...aro.org>
Subject: Re: [PATCH v2 2/2] phy: add NXP PTN3222 eUSB2 to USB2 redriver
On 8/30/2024 4:20 PM, 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@...aro.org>
> Tested-by: Konrad Dybcio <konradybcio@...nel.org>
> Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@...aro.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");
>
The I2C driver just realizes the function on reset and PWR. What about
other I2C driver function like I2C interface operations, auto-suspend,
remote wakeup, memory maps etc. Who will enable these? I think it is not
incomplete I2C driver, if on someday, ptn3222 is used as I2C device.
Regards,
Song Xue
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