Thread (21 messages) 21 messages, 5 authors, 2025-02-17

Re: [PATCH v1 3/4] phy: samsung: add Exynos2200 SNPS eUSB2 driver

From: Krzysztof Kozlowski <krzk@kernel.org>
Date: 2025-02-16 09:27:01
Also in: linux-devicetree, linux-phy, linux-samsung-soc, lkml

On 15/02/2025 13:24, Ivaylo Ivanov wrote:
quoted hunk ↗ jump to hunk
The Exynos2200 SoC uses Synopsis eUSB2 PHY for USB 2.0. Add a new
driver for it.

eUSB2 on Exynos SoCs is usually paired alongside a USB PHY controller.
Currently the driver is modelled to take and enable/disable the usb phy
controller when needed.

The driver is based on information from downstream drivers.

Signed-off-by: Ivaylo Ivanov <ivo.ivanov.ivanov1@gmail.com>
---
 drivers/phy/samsung/Kconfig                   |  13 +
 drivers/phy/samsung/Makefile                  |   1 +
 .../phy/samsung/phy-exynos2200-snps-eusb2.c   | 351 ++++++++++++++++++
 3 files changed, 365 insertions(+)
 create mode 100644 drivers/phy/samsung/phy-exynos2200-snps-eusb2.c
diff --git a/drivers/phy/samsung/Kconfig b/drivers/phy/samsung/Kconfig
index e2330b089..f62285254 100644
--- a/drivers/phy/samsung/Kconfig
+++ b/drivers/phy/samsung/Kconfig
@@ -77,6 +77,19 @@ config PHY_S5PV210_USB2
 	  particular SoC is compiled in the driver. In case of S5PV210 two phys
 	  are available - device and host.
 
+config PHY_EXYNOS2200_SNPS_EUSB2
+	tristate "Exynos2200 eUSB 2.0 PHY driver"
+	depends on (ARCH_EXYNOS && OF) || COMPILE_TEST
+	depends on HAS_IOMEM
+	depends on USB_DWC3_EXYNOS

How does it depend? What are you using from DWC3?
+	select GENERIC_PHY
+	select MFD_SYSCON
Where do you use it?
quoted hunk ↗ jump to hunk
+	default y
+	help
+	  Enable USBCON PHY support for Exynos2200 SoC.
+	  This driver provides PHY interface for eUSB 2.0 controller
+	  present on Exynos5 SoC series.
+
 config PHY_EXYNOS5_USBDRD
 	tristate "Exynos5 SoC series USB DRD PHY driver"
 	depends on (ARCH_EXYNOS && OF) || COMPILE_TEST
diff --git a/drivers/phy/samsung/Makefile b/drivers/phy/samsung/Makefile
index fea1f96d0..90b84c7fc 100644
--- a/drivers/phy/samsung/Makefile
+++ b/drivers/phy/samsung/Makefile
@@ -14,5 +14,6 @@ phy-exynos-usb2-$(CONFIG_PHY_EXYNOS4210_USB2)	+= phy-exynos4210-usb2.o
 phy-exynos-usb2-$(CONFIG_PHY_EXYNOS4X12_USB2)	+= phy-exynos4x12-usb2.o
 phy-exynos-usb2-$(CONFIG_PHY_EXYNOS5250_USB2)	+= phy-exynos5250-usb2.o
 phy-exynos-usb2-$(CONFIG_PHY_S5PV210_USB2)	+= phy-s5pv210-usb2.o
+obj-$(CONFIG_PHY_EXYNOS2200_SNPS_EUSB2)	+= phy-exynos2200-snps-eusb2.o
Entire driver looks like repeating existing qcom-snps-eusb2. You need to
integrate the changes, not create duplicated driver.

...
+
+	ret = devm_clk_bulk_get(dev, drv_data->n_clks,
+				phy->clks);
+	if (ret)
+		return dev_err_probe(dev, ret,
+				     "failed to get phy clock(s)\n");
+
+	for (int i = 0; i < phy->drv_data->n_clks; ++i) {
+		if (!strcmp(phy->clks[i].id, "ref")) {
+			phy->ref_clk = phy->clks[i].clk;
+			break;
+		}
+	}
+
+	phy->vregs = devm_kcalloc(dev, drv_data->n_regulators,
+				  sizeof(*phy->vregs), GFP_KERNEL);
+	if (!phy->vregs)
+		return -ENOMEM;
+	regulator_bulk_set_supply_names(phy->vregs,
+					drv_data->regulator_names,
+					drv_data->n_regulators);
+	ret = devm_regulator_bulk_get(dev, drv_data->n_regulators,
+				      phy->vregs);
+	if (ret)
+		return dev_err_probe(dev, ret, "failed to get regulators\n");
+
+	/* we treat the usblink controller phy as a separate phy */
+	phy->usbcon = devm_of_phy_get_by_index(dev, np, 0);
+	if (IS_ERR(phy->usbcon))
+		return dev_err_probe(dev, PTR_ERR(phy->usbcon),
+				     "failed to get usbcon\n");
+
+	generic_phy = devm_phy_create(dev, NULL, &exynos2200_snps_eusb2_phy_ops);
+	if (IS_ERR(generic_phy)) {
+		dev_err(dev, "failed to create phy %d\n", ret);

Syntax is return dev_err_probe
+		return PTR_ERR(generic_phy);
+	}
+
+	dev_set_drvdata(dev, phy);
+	phy_set_drvdata(generic_phy, phy);
+
+	phy_provider = devm_of_phy_provider_register(dev, of_phy_simple_xlate);
+	if (IS_ERR(phy_provider)) {
+		dev_err(dev, "failed to register phy provider\n");

Syntax is return dev_err_probe
+		return PTR_ERR(phy_provider);
+	};
+
+	return 0;
+}
Best regards,
Krzysztof
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