[PATCH v17 3/7] usb: dwc3: rockchip: introduce glue driver

[Sebastian Reichel]

Introduce Rockchip specific glue code for the Synopsys DWC3 USB driver.
For now this handles things identical to the default glue.

After this change the glue driver is mandatory for Rockchip RK3588 and
RK3576; it does not make sense to fallback to the core driver as the
whole purpose of the glue driver is fixing race conditions resulting in
SErrors and non-functional USB.

Tested-by: Igor Paunovic <royalnet026@xxxxxxxxx> # Orange Pi 5 Plus
Signed-off-by: Sebastian Reichel <sebastian.reichel@xxxxxxxxxxxxx>
---
 drivers/usb/dwc3/Kconfig         |  11 ++++
 drivers/usb/dwc3/Makefile        |   1 +
 drivers/usb/dwc3/core.c          |  15 ++++++
 drivers/usb/dwc3/dwc3-rockchip.c | 106 +++++++++++++++++++++++++++++++++++++++
 4 files changed, 133 insertions(+)

diff --git a/drivers/usb/dwc3/Kconfig b/drivers/usb/dwc3/Kconfig
index 18169727a413..3c120ea9746d 100644
--- a/drivers/usb/dwc3/Kconfig
+++ b/drivers/usb/dwc3/Kconfig
@@ -190,6 +190,17 @@ config USB_DWC3_OCTEON
 	  Only the host mode is currently supported.
 	  Say 'Y' or 'M' here if you have one such device.
 
+config USB_DWC3_ROCKCHIP
+	tristate "Rockchip DWC3 Platform Driver"
+	depends on ARCH_ROCKCHIP || COMPILE_TEST
+	depends on OF
+	default USB_DWC3
+	help
+	  Rockchip SoCs with DesignWare Core USB3 IP inside,
+	  and IP Core configured for USB 2.0 and USB 3.0 in host
+	  or dual-role mode.
+	  Say 'Y' or 'M' if you have such device.
+
 config USB_DWC3_RTK
 	tristate "Realtek DWC3 Platform Driver"
 	depends on OF && ARCH_REALTEK
diff --git a/drivers/usb/dwc3/Makefile b/drivers/usb/dwc3/Makefile
index f37971197203..444e7e7f34b2 100644
--- a/drivers/usb/dwc3/Makefile
+++ b/drivers/usb/dwc3/Makefile
@@ -58,6 +58,7 @@ obj-$(CONFIG_USB_DWC3_IMX8MP)		+= dwc3-imx8mp.o
 obj-$(CONFIG_USB_DWC3_IMX)		+= dwc3-imx.o
 obj-$(CONFIG_USB_DWC3_XILINX)		+= dwc3-xilinx.o
 obj-$(CONFIG_USB_DWC3_OCTEON)		+= dwc3-octeon.o
+obj-$(CONFIG_USB_DWC3_ROCKCHIP)		+= dwc3-rockchip.o
 obj-$(CONFIG_USB_DWC3_RTK)		+= dwc3-rtk.o
 obj-$(CONFIG_USB_DWC3_GENERIC_PLAT)	+= dwc3-generic-plat.o
 obj-$(CONFIG_USB_DWC3_GOOGLE)		+= dwc3-google.o
diff --git a/drivers/usb/dwc3/core.c b/drivers/usb/dwc3/core.c
index fd5c2cd36c59..4b7132887a03 100644
--- a/drivers/usb/dwc3/core.c
+++ b/drivers/usb/dwc3/core.c
@@ -2448,11 +2448,26 @@ int dwc3_core_probe(const struct dwc3_probe_data *data)
 }
 EXPORT_SYMBOL_GPL(dwc3_core_probe);
 
+/*
+ * List of compatibles, which have "synopsys,dwc3" as a fallback
+ * compatible, but have a vendor specific glue driver that should
+ * be used instead of this one.
+ */
+static const char *const dwc3_compatible_blocklist[] = {
+	"rockchip,rk3588-dwc3",
+	"rockchip,rk3576-dwc3",
+};
+
 static int dwc3_probe(struct platform_device *pdev)
 {
 	struct dwc3_probe_data probe_data = {};
 	struct resource *res;
 	struct dwc3 *dwc;
+	int i;
+
+	for (i = 0; i < ARRAY_SIZE(dwc3_compatible_blocklist); i++)
+		if (device_is_compatible(&pdev->dev, dwc3_compatible_blocklist[i]))
+			return -ENODEV;
 
 	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 	if (!res) {
diff --git a/drivers/usb/dwc3/dwc3-rockchip.c b/drivers/usb/dwc3/dwc3-rockchip.c
new file mode 100644
index 000000000000..4129aefd6a8b
--- /dev/null
+++ b/drivers/usb/dwc3/dwc3-rockchip.c
@@ -0,0 +1,106 @@
+// SPDX-License-Identifier: GPL-2.0
+/* Copyright (c) 2026, Collabora Ltd. */
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/pm_runtime.h>
+#include "glue.h"
+
+struct dwc3_rockchip {
+	struct dwc3		dwc;
+};
+
+static int dwc3_rockchip_probe(struct platform_device *pdev)
+{
+	struct dwc3_probe_data probe_data = {};
+	struct resource *res;
+	struct dwc3_rockchip *dwc_rk;
+
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	if (!res) {
+		dev_err(&pdev->dev, "missing memory resource\n");
+		return -ENODEV;
+	}
+
+	dwc_rk = devm_kzalloc(&pdev->dev, sizeof(*dwc_rk), GFP_KERNEL);
+	if (!dwc_rk)
+		return -ENOMEM;
+
+	dwc_rk->dwc.dev = &pdev->dev;
+	dwc_rk->dwc.glue_ops = NULL;
+
+	probe_data.dwc = &dwc_rk->dwc;
+	probe_data.res = res;
+	probe_data.properties = DWC3_DEFAULT_PROPERTIES;
+
+	return dwc3_core_probe(&probe_data);
+}
+
+static void dwc3_rockchip_remove(struct platform_device *pdev)
+{
+	dwc3_core_remove(platform_get_drvdata(pdev));
+}
+
+static int dwc3_rockchip_runtime_suspend(struct device *dev)
+{
+	return dwc3_runtime_suspend(dev_get_drvdata(dev));
+}
+
+static int dwc3_rockchip_runtime_resume(struct device *dev)
+{
+	return dwc3_runtime_resume(dev_get_drvdata(dev));
+}
+
+static int dwc3_rockchip_runtime_idle(struct device *dev)
+{
+	return dwc3_runtime_idle(dev_get_drvdata(dev));
+}
+
+static int dwc3_rockchip_suspend(struct device *dev)
+{
+	return dwc3_pm_suspend(dev_get_drvdata(dev));
+}
+
+static int dwc3_rockchip_resume(struct device *dev)
+{
+	return dwc3_pm_resume(dev_get_drvdata(dev));
+}
+
+static void dwc3_rockchip_complete(struct device *dev)
+{
+	dwc3_pm_complete(dev_get_drvdata(dev));
+}
+
+static int dwc3_rockchip_prepare(struct device *dev)
+{
+	return dwc3_pm_prepare(dev_get_drvdata(dev));
+}
+
+static const struct dev_pm_ops dwc3_rockchip_dev_pm_ops = {
+	SYSTEM_SLEEP_PM_OPS(dwc3_rockchip_suspend, dwc3_rockchip_resume)
+	RUNTIME_PM_OPS(dwc3_rockchip_runtime_suspend, dwc3_rockchip_runtime_resume,
+		       dwc3_rockchip_runtime_idle)
+	.complete = pm_sleep_ptr(dwc3_rockchip_complete),
+	.prepare = pm_sleep_ptr(dwc3_rockchip_prepare),
+};
+
+static const struct of_device_id dwc3_rockchip_of_match[] = {
+	{ .compatible = "rockchip,rk3588-dwc3" },
+	{ .compatible = "rockchip,rk3576-dwc3" },
+	{ }
+};
+MODULE_DEVICE_TABLE(of, dwc3_rockchip_of_match);
+
+static struct platform_driver dwc3_rockchip_driver = {
+	.probe		= dwc3_rockchip_probe,
+	.remove		= dwc3_rockchip_remove,
+	.driver		= {
+		.name	= "dwc3-rockchip",
+		.pm	= pm_ptr(&dwc3_rockchip_dev_pm_ops),
+		.of_match_table	= dwc3_rockchip_of_match,
+	},
+};
+
+module_platform_driver(dwc3_rockchip_driver);
+
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("DesignWare DWC3 Rockchip Glue Driver");

-- 
2.53.0