[PATCH net-next v2 2/8] net: xilinx: tsn: add TSN endpoint wrapper driver

[Srinivas Neeli <srinivas.neeli@amd.com>]

The TSN Endpoint Ethernet MAC IP groups several sub-nodes under one IP
node with a set of IP-wide clocks. Each sub-node needs its own driver,
and the shared clocks must be running before any of them probe.

Add a thin wrapper platform driver for the IP node. Enable the IP-wide
clocks from the device tree and bind each sub-node to its own driver.

Co-developed-by: Nagadheeraj Rottela <nagadheeraj.rottela@amd.com>
Signed-off-by: Nagadheeraj Rottela <nagadheeraj.rottela@amd.com>
Signed-off-by: Srinivas Neeli <srinivas.neeli@amd.com>

---
Changes in v2:
- Depend on OF_ADDRESS instead of OF && HAS_IOMEM.
- Point the Kconfig help text at the companion DSA driver, not a symbol that
  does not exist yet at this patch.
- Drop the mod_devicetable.h include, platform_device.h already pulls it in.
---
 MAINTAINERS                                       |   1 +
 drivers/net/ethernet/xilinx/Kconfig               |   1 +
 drivers/net/ethernet/xilinx/Makefile              |   1 +
 drivers/net/ethernet/xilinx/tsn/Kconfig           |  15 ++++
 drivers/net/ethernet/xilinx/tsn/Makefile          |   2 +
 drivers/net/ethernet/xilinx/tsn/xilinx_tsn_main.c | 104 ++++++++++++++++++++++
 6 files changed, 124 insertions(+)

diff --git a/MAINTAINERS b/MAINTAINERS
index 8f93f165a744..ff94e314eeb1 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -29917,6 +29917,7 @@ M:	Srinivas Neeli <srinivas.neeli@amd.com>
 L:	netdev@vger.kernel.org
 S:	Maintained
 F:	Documentation/devicetree/bindings/net/xlnx,tsn-endpoint-ethernet-mac.yaml
+F:	drivers/net/ethernet/xilinx/tsn/
 
 XILINX UARTLITE SERIAL DRIVER
 M:	Peter Korsgaard <jacmet@sunsite.dk>
diff --git a/drivers/net/ethernet/xilinx/Kconfig b/drivers/net/ethernet/xilinx/Kconfig
index 7502214cc7d5..c6d704c8d3d4 100644
--- a/drivers/net/ethernet/xilinx/Kconfig
+++ b/drivers/net/ethernet/xilinx/Kconfig
@@ -41,4 +41,5 @@ config XILINX_LL_TEMAC
 	  This driver supports the Xilinx 10/100/1000 LocalLink TEMAC
 	  core used in Xilinx Spartan and Virtex FPGAs
 
+source "drivers/net/ethernet/xilinx/tsn/Kconfig"
 endif # NET_VENDOR_XILINX
diff --git a/drivers/net/ethernet/xilinx/Makefile b/drivers/net/ethernet/xilinx/Makefile
index 7d7dc1771423..66dab012650b 100644
--- a/drivers/net/ethernet/xilinx/Makefile
+++ b/drivers/net/ethernet/xilinx/Makefile
@@ -8,3 +8,4 @@ obj-$(CONFIG_XILINX_LL_TEMAC) += ll_temac.o
 obj-$(CONFIG_XILINX_EMACLITE) += xilinx_emaclite.o
 xilinx_emac-objs := xilinx_axienet_main.o xilinx_axienet_mdio.o
 obj-$(CONFIG_XILINX_AXI_EMAC) += xilinx_emac.o
+obj-$(CONFIG_XILINX_TSN) += tsn/
diff --git a/drivers/net/ethernet/xilinx/tsn/Kconfig b/drivers/net/ethernet/xilinx/tsn/Kconfig
new file mode 100644
index 000000000000..b8939d8a92ef
--- /dev/null
+++ b/drivers/net/ethernet/xilinx/tsn/Kconfig
@@ -0,0 +1,15 @@
+# SPDX-License-Identifier: GPL-2.0-only
+#
+# Xilinx TSN device configuration
+#
+
+config XILINX_TSN
+	tristate "Xilinx TSN Ethernet driver"
+	depends on OF_ADDRESS
+	help
+	  This driver supports the AMD/Xilinx Time-Sensitive Networking
+	  (TSN) Endpoint Ethernet MAC IP. It provides the wrapper device
+	  and the endpoint MAC that connects the IP to the host CPU. The
+	  three-port switch is supported by the companion DSA driver.
+
+	  If unsure, say N.
diff --git a/drivers/net/ethernet/xilinx/tsn/Makefile b/drivers/net/ethernet/xilinx/tsn/Makefile
new file mode 100644
index 000000000000..6f99226f3dc8
--- /dev/null
+++ b/drivers/net/ethernet/xilinx/tsn/Makefile
@@ -0,0 +1,2 @@
+obj-$(CONFIG_XILINX_TSN) += xilinx_tsn.o
+xilinx_tsn-y := xilinx_tsn_main.o
diff --git a/drivers/net/ethernet/xilinx/tsn/xilinx_tsn_main.c b/drivers/net/ethernet/xilinx/tsn/xilinx_tsn_main.c
new file mode 100644
index 000000000000..afe7609c67fb
--- /dev/null
+++ b/drivers/net/ethernet/xilinx/tsn/xilinx_tsn_main.c
@@ -0,0 +1,104 @@
+// SPDX-License-Identifier: GPL-2.0
+
+/*
+ * Time Sensitive Networking (TSN) Ethernet MAC wrapper driver.
+ *
+ * Copyright (C) 2026 Advanced Micro Devices, Inc.
+ */
+
+#include <linux/clk.h>
+#include <linux/device.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/of_platform.h>
+#include <linux/platform_device.h>
+#include <linux/slab.h>
+#include <linux/types.h>
+
+#define TSN_NUM_CLOCKS		6
+
+/**
+ * struct xlnx_tsn_ip - wrapper-private IP state
+ * @clks: bulk-managed IP clocks
+ */
+struct xlnx_tsn_ip {
+	struct clk_bulk_data clks[TSN_NUM_CLOCKS];
+};
+
+static const char * const tsn_clk_names[TSN_NUM_CLOCKS] = {
+	"gtx",
+	"gtx90",
+	"host_rxfifo",
+	"host_txfifo",
+	"ref",
+	"s_axi",
+};
+
+static void tsn_clk_bulk_disable(void *data)
+{
+	struct xlnx_tsn_ip *w = data;
+
+	clk_bulk_disable_unprepare(TSN_NUM_CLOCKS, w->clks);
+}
+
+static int tsn_ip_probe(struct platform_device *pdev)
+{
+	struct device *dev = &pdev->dev;
+	struct xlnx_tsn_ip *w;
+	int ret;
+
+	w = devm_kzalloc(dev, sizeof(*w), GFP_KERNEL);
+	if (!w)
+		return -ENOMEM;
+
+	for (int i = 0; i < TSN_NUM_CLOCKS; i++)
+		w->clks[i].id = tsn_clk_names[i];
+
+	ret = devm_clk_bulk_get(dev, TSN_NUM_CLOCKS, w->clks);
+	if (ret)
+		return dev_err_probe(dev, ret, "failed to get clocks\n");
+
+	ret = clk_bulk_prepare_enable(TSN_NUM_CLOCKS, w->clks);
+	if (ret)
+		return dev_err_probe(dev, ret, "failed to enable clocks\n");
+
+	ret = devm_add_action_or_reset(dev, tsn_clk_bulk_disable, w);
+	if (ret)
+		return ret;
+
+	return devm_of_platform_populate(dev);
+}
+
+static const struct of_device_id tsn_of_match[] = {
+	{ .compatible = "xlnx,tsn-endpoint-ethernet-mac-3.0" },
+	{ }
+};
+MODULE_DEVICE_TABLE(of, tsn_of_match);
+
+static struct platform_driver tsn_driver = {
+	.probe = tsn_ip_probe,
+	.driver = {
+		.name = "xilinx-tsn",
+		.of_match_table = tsn_of_match,
+	},
+};
+
+static struct platform_driver * const tsn_drivers[] = {
+	&tsn_driver,
+};
+
+static int __init xlnx_tsn_init(void)
+{
+	return platform_register_drivers(tsn_drivers, ARRAY_SIZE(tsn_drivers));
+}
+module_init(xlnx_tsn_init);
+
+static void __exit xlnx_tsn_exit(void)
+{
+	platform_unregister_drivers(tsn_drivers, ARRAY_SIZE(tsn_drivers));
+}
+module_exit(xlnx_tsn_exit);
+
+MODULE_AUTHOR("Srinivas Neeli <srinivas.neeli@amd.com>");
+MODULE_DESCRIPTION("AMD/Xilinx TSN Endpoint Ethernet MAC wrapper driver");
+MODULE_LICENSE("GPL");

-- 
2.43.0