drivers/phy/nuvoton/phy-ma35d1-usb2.c

Source file repositories/reference/linux-study-clean/drivers/phy/nuvoton/phy-ma35d1-usb2.c

File Facts

System
Linux kernel
Corpus path
drivers/phy/nuvoton/phy-ma35d1-usb2.c
Extension
.c
Size
4000 bytes
Lines
144
Domain
Driver Families
Bucket
drivers/phy
Inferred role
Driver Families: implementation source
Status
source implementation candidate

Why This File Exists

Repeatable hardware-adapter layer. Deep compatibility for every driver is out of scope; this atlas records patterns, probe lifecycles, bus glue, IRQ/DMA usage, and links back to core abstractions.

Dependency Surface

Detected Declarations

Annotated Snippet

struct ma35_usb_phy {
	struct clk *clk;
	struct device *dev;
	struct regmap *sysreg;
};

static int ma35_usb_phy_power_on(struct phy *phy)
{
	struct ma35_usb_phy *p_phy = phy_get_drvdata(phy);
	unsigned int val;
	int ret;

	ret = clk_prepare_enable(p_phy->clk);
	if (ret < 0) {
		dev_err(p_phy->dev, "Failed to enable PHY clock: %d\n", ret);
		return ret;
	}

	regmap_read(p_phy->sysreg, MA35_SYS_REG_USBPMISCR, &val);
	if (val & PHY0SUSPEND) {
		/*
		 * USB PHY0 is in operation mode already
		 * make sure USB PHY 60 MHz UTMI Interface Clock ready
		 */
		ret = regmap_read_poll_timeout(p_phy->sysreg, MA35_SYS_REG_USBPMISCR, val,
						val & PHY0DEVCKSTB, 10, 1000);
		if (ret == 0)
			return 0;
	}

	/*
	 * reset USB PHY0.
	 * wait until USB PHY0 60 MHz UTMI Interface Clock ready
	 */
	regmap_update_bits(p_phy->sysreg, MA35_SYS_REG_USBPMISCR, 0x7, (PHY0POR | PHY0SUSPEND));
	udelay(20);

	/* make USB PHY0 enter operation mode */
	regmap_update_bits(p_phy->sysreg, MA35_SYS_REG_USBPMISCR, 0x7, PHY0SUSPEND);

	/* make sure USB PHY 60 MHz UTMI Interface Clock ready */
	ret = regmap_read_poll_timeout(p_phy->sysreg, MA35_SYS_REG_USBPMISCR, val,
					val & PHY0DEVCKSTB, 10, 1000);
	if (ret == -ETIMEDOUT) {
		dev_err(p_phy->dev, "Check PHY clock, Timeout: %d\n", ret);
		clk_disable_unprepare(p_phy->clk);
		return ret;
	}

	return 0;
}

static int ma35_usb_phy_power_off(struct phy *phy)
{
	struct ma35_usb_phy *p_phy = phy_get_drvdata(phy);

	clk_disable_unprepare(p_phy->clk);
	return 0;
}

static const struct phy_ops ma35_usb_phy_ops = {
	.power_on = ma35_usb_phy_power_on,
	.power_off = ma35_usb_phy_power_off,
	.owner = THIS_MODULE,
};

static int ma35_usb_phy_probe(struct platform_device *pdev)
{
	struct phy_provider *provider;
	struct ma35_usb_phy *p_phy;
	struct phy *phy;

	p_phy = devm_kzalloc(&pdev->dev, sizeof(*p_phy), GFP_KERNEL);
	if (!p_phy)
		return -ENOMEM;

	p_phy->dev = &pdev->dev;
	platform_set_drvdata(pdev, p_phy);

	p_phy->sysreg = syscon_regmap_lookup_by_phandle(pdev->dev.of_node, "nuvoton,sys");
	if (IS_ERR(p_phy->sysreg))
		return dev_err_probe(&pdev->dev, PTR_ERR(p_phy->sysreg),
				     "Failed to get SYS registers\n");

	p_phy->clk = of_clk_get(pdev->dev.of_node, 0);
	if (IS_ERR(p_phy->clk))
		return dev_err_probe(&pdev->dev, PTR_ERR(p_phy->clk),
				     "failed to find usb_phy clock\n");

	phy = devm_phy_create(&pdev->dev, NULL, &ma35_usb_phy_ops);

Annotation

Implementation Notes