On 2023/4/24 16:46, Roger Quadros wrote:
> Hi Minda,
>
> On 20/04/2023 14:00, Minda Chen wrote:
>> Add Starfive JH7110 SoC USB 2.0 PHY driver support.
>> USB 2.0 PHY default connect to Cadence USB controller.
>>
>> Signed-off-by: Minda Chen <minda.chen@xxxxxxxxxxxxxxxx>
>> ---
>> MAINTAINERS | 6 +
>> drivers/phy/starfive/Kconfig | 11 ++
>> drivers/phy/starfive/Makefile | 1 +
>> drivers/phy/starfive/phy-jh7110-usb.c | 162 ++++++++++++++++++++++++++
>> 4 files changed, 180 insertions(+)
>> create mode 100644 drivers/phy/starfive/phy-jh7110-usb.c
>>
>> diff --git a/MAINTAINERS b/MAINTAINERS
>> index 1aef5ba46d71..c09ea66dcd5a 100644
>> --- a/MAINTAINERS
>> +++ b/MAINTAINERS
>> @@ -19968,6 +19968,12 @@ M: William Qiu <william.qiu@xxxxxxxxxxxxxxxx>
>> S: Supported
>> F: Documentation/devicetree/bindings/soc/starfive/starfive,jh7110-syscon.yaml
>>
>> +STARFIVE JH71X0 USB PHY DRIVER
>> +M: Minda Chen <minda.chen@xxxxxxxxxxxxxxxx>
>> +S: Supported
>> +F: Documentation/devicetree/bindings/phy/starfive,jh7110-usb-phy.yaml
>> +F: drivers/phy/starfive/phy-jh7110-usb.c
>> +
>> STATIC BRANCH/CALL
>> M: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
>> M: Josh Poimboeuf <jpoimboe@xxxxxxxxxx>
>> diff --git a/drivers/phy/starfive/Kconfig b/drivers/phy/starfive/Kconfig
>> index f989b8ff8bcb..2c013c390dee 100644
>> --- a/drivers/phy/starfive/Kconfig
>> +++ b/drivers/phy/starfive/Kconfig
>> @@ -11,3 +11,14 @@ config PHY_STARFIVE_DPHY_RX
>> Choose this option if you have a StarFive D-PHY in your
>> system. If M is selected, the module will be called
>> phy-starfive-dphy-rx.
>> +
>> +config PHY_STARFIVE_JH7110_USB
>> + tristate "Starfive JH7110 USB 2.0 PHY support"
>> + depends on USB_SUPPORT
>> + select GENERIC_PHY
>> + select USB_PHY
>> + help
>> + Enable this to support the StarFive USB 2.0 PHY,
>> + used with the Cadence USB controller.
>> + If M is selected, the module will be called
>> + phy-jh7110-usb.ko.
>> diff --git a/drivers/phy/starfive/Makefile b/drivers/phy/starfive/Makefile
>> index 7ec576cb30ae..176443852f4d 100644
>> --- a/drivers/phy/starfive/Makefile
>> +++ b/drivers/phy/starfive/Makefile
>> @@ -1,2 +1,3 @@
>> # SPDX-License-Identifier: GPL-2.0
>> obj-$(CONFIG_PHY_STARFIVE_DPHY_RX) += phy-starfive-dphy-rx.o
>> +obj-$(CONFIG_PHY_STARFIVE_JH7110_USB) += phy-jh7110-usb.o
>> diff --git a/drivers/phy/starfive/phy-jh7110-usb.c b/drivers/phy/starfive/phy-jh7110-usb.c
>> new file mode 100644
>> index 000000000000..4a12df0692cd
>> --- /dev/null
>> +++ b/drivers/phy/starfive/phy-jh7110-usb.c
>> @@ -0,0 +1,162 @@
>> +// SPDX-License-Identifier: GPL-2.0+
>> +/*
>> + * StarFive JH7110 USB 2.0 PHY driver
>> + *
>> + * Copyright (C) 2023 StarFive Technology Co., Ltd.
>> + * Author: Minda Chen <minda.chen@xxxxxxxxxxxxxxxx>
>> + */
>> +
>> +#include <linux/bits.h>
>> +#include <linux/clk.h>
>> +#include <linux/err.h>
>> +#include <linux/io.h>
>> +#include <linux/module.h>
>> +#include <linux/phy/phy.h>
>> +#include <linux/platform_device.h>
>> +#include <linux/usb/of.h>
>> +
>> +#define USB_125M_CLK_RATE 125000000
>> +#define USB_LS_KEEPALIVE_OFF 0x4
>> +#define USB_LS_KEEPALIVE_ENABLE BIT(4)
>> +
>> +struct jh7110_usb2_phy {
>> + struct phy *phy;
>> + void __iomem *regs;
>> + struct clk *usb_125m_clk;
>> + struct clk *app_125m;
>> + enum phy_mode mode;
>> +};
>> +
>> +static void jh7110_usb2_mode_set(struct jh7110_usb2_phy *phy)
>> +{
>> + unsigned int val;
>> +
>> + if (phy->mode != PHY_MODE_USB_HOST) {
>> + /* Enable the LS speed keep-alive signal */
>> + val = readl(phy->regs + USB_LS_KEEPALIVE_OFF);
>> + val |= USB_LS_KEEPALIVE_ENABLE;
>> + writel(val, phy->regs + USB_LS_KEEPALIVE_OFF);
>> + }
>> +}
>> +
>> +static int jh7110_usb2_phy_set_mode(struct phy *_phy,
>> + enum phy_mode mode, int submode)
>> +{
>> + struct jh7110_usb2_phy *phy = phy_get_drvdata(_phy);
>> +
>> + switch (mode) {
>> + case PHY_MODE_USB_HOST:
>> + case PHY_MODE_USB_DEVICE:
>> + case PHY_MODE_USB_OTG:
>> + break;
>> + default:
>> + return -EINVAL;
>> + }
>> +
>> + if (mode != phy->mode) {
>> + dev_info(&_phy->dev, "Changing phy to %d\n", mode);
>
> dev_dbg() please?
>
ok, thanks
>> + phy->mode = mode;
>> + jh7110_usb2_mode_set(phy);
>> + }
>> +
>> + return 0;
>> +}
>> +
>> +static int jh7110_usb2_phy_init(struct phy *_phy)
>> +{
>> + struct jh7110_usb2_phy *phy = phy_get_drvdata(_phy);
>> + int ret;
>> +
>> + ret = clk_set_rate(phy->usb_125m_clk, USB_125M_CLK_RATE);
>> + if (ret)
>> + return ret;
>> +
>> + ret = clk_prepare_enable(phy->app_125m);
>> + if (ret)
>> + return ret;
>> +
>> + return 0;
>> +}
>> +
>> +static int jh7110_usb2_phy_exit(struct phy *_phy)
>> +{
>> + struct jh7110_usb2_phy *phy = phy_get_drvdata(_phy);
>> +
>> + clk_disable_unprepare(phy->app_125m);
>> +
>> + return 0;
>> +}
>> +
>> +static const struct phy_ops jh7110_usb2_phy_ops = {
>> + .init = jh7110_usb2_phy_init,
>> + .exit = jh7110_usb2_phy_exit,
>> + .set_mode = jh7110_usb2_phy_set_mode,
>> + .owner = THIS_MODULE,
>> +};
>> +
>> +static int jh7110_usb_phy_probe(struct platform_device *pdev)
>> +{
>> + struct jh7110_usb2_phy *phy;
>> + struct device *dev = &pdev->dev;
>> + struct phy_provider *phy_provider;
>> +
>> + phy = devm_kzalloc(dev, sizeof(*phy), GFP_KERNEL);
>> + if (!phy)
>> + return -ENOMEM;
>> +
>> + phy->usb_125m_clk = devm_clk_get(dev, "125m");
>> + if (IS_ERR(phy->usb_125m_clk))
>> + return dev_err_probe(dev, PTR_ERR(phy->usb_125m_clk),
>> + "Failed to get 125m clock\n");
>> +
>> + phy->app_125m = devm_clk_get(dev, "app_125m");
>> + if (IS_ERR(phy->app_125m))
>> + return dev_err_probe(dev, PTR_ERR(phy->app_125m),
>> + "Failed to get app 125m clock\n");
>> +
>> + phy->regs = devm_platform_ioremap_resource(pdev, 0);
>> + if (IS_ERR(phy->regs))
>> + return dev_err_probe(dev, PTR_ERR(phy->regs),
>> + "Failed to map phy base\n");
>> +
>> + phy->phy = devm_phy_create(dev, NULL, &jh7110_usb2_phy_ops);
>> + if (IS_ERR(phy->phy))
>> + return dev_err_probe(dev, PTR_ERR(phy->phy),
>> + "Failed to create phy\n");
>> +
>> + platform_set_drvdata(pdev, phy);
>> + phy_set_drvdata(phy->phy, phy);
>> + phy_provider = devm_of_phy_provider_register(dev, of_phy_simple_xlate);
>> +
>> + return PTR_ERR_OR_ZERO(phy_provider);
>> +}
>> +
>> +static int jh7110_usb_phy_remove(struct platform_device *pdev)
>> +{
>> + struct jh7110_usb2_phy *phy = platform_get_drvdata(pdev);
>> +
>> + clk_disable_unprepare(phy->app_125m);
>
> Why do you need to do clk_disable here? You didn't enable it in probe.
>
OK, Just disable clocks in phy exit
>> + platform_set_drvdata(pdev, NULL);
>> +
>> + return 0;
>> +}
>> +
>> +static const struct of_device_id jh7110_usb_phy_of_match[] = {
>> + { .compatible = "starfive,jh7110-usb-phy" },
>> + { /* sentinel */ },
>> +};
>> +MODULE_DEVICE_TABLE(of, jh7110_usb_phy_of_match);
>> +
>> +static struct platform_driver jh7110_usb_phy_driver = {
>> + .probe = jh7110_usb_phy_probe,
>> + .remove = jh7110_usb_phy_remove,
>> + .driver = {
>> + .of_match_table = jh7110_usb_phy_of_match,
>> + .name = "jh7110-usb-phy",
>> + }
>> +};
>> +module_platform_driver(jh7110_usb_phy_driver);
>> +
>> +MODULE_DESCRIPTION("StarFive JH7110 USB 2.0 PHY driver");
>> +MODULE_AUTHOR("Minda Chen <minda.chen@xxxxxxxxxxxxxxxx>");
>> +MODULE_LICENSE("GPL");
>
> cheers,
> -roger
