Re: [PATCH net-next v2 2/8] net: xilinx: tsn: add TSN endpoint wrapper driver
From: netdev-bot+sashiko@kernel.org
Date: 2026-09-12 20:36:22
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linux-arm-kernel, linux-devicetree, linux-rt-devel, lkml
Thank you for your contribution! Sashiko AI review found 2 potential issue(s) to consider: Critical: 0 · High: 0 · Medium: 0 · Low: 2 - [Low] Kconfig help text for CONFIG_XILINX_TSN claims the option "provides the wrapper device and the endpoint MAC that connects the IP… - [Low] The binding Documentation/devicetree/bindings/net/xlnx,tsn- endpoint-ethernet-mac.yaml puts 'xlnx,num-priorities' (uint32, 2..8)… -- net: xilinx: tsn: add TSN endpoint wrapper driver This adds a thin wrapper platform driver for the AMD/Xilinx TSN Endpoint Ethernet MAC IP node. The wrapper enables the six IP-wide clocks described in the device tree and then populates the DT sub-nodes so each one can bind to its own driver. A couple of questions on the new Kconfig text and on the DT properties the wrapper consumes. [ ... ]
quoted hunk ↗ jump to hunk
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.
[Severity: Low] Is the help text accurate at this point in the series? It says the option "provides the wrapper device and the endpoint MAC that connects the IP to the host CPU", but the Makefile added by this patch builds only the wrapper object: xilinx_tsn-y := xilinx_tsn_main.o and tsn_drivers[] registers only &tsn_driver, which matches "xlnx,tsn-endpoint-ethernet-mac-3.0". No driver in the tree matches the sub-node compatibles at this commit, so devm_of_platform_populate() in tsn_ip_probe() creates child platform devices that cannot bind, and enabling the symbol here yields enabled clocks but no netdev. The endpoint MAC part is resolved by later patches in this same series: by the end of the series the Makefile also builds xilinx_tsn_ep.o, tsn_drivers[] gains &xlnx_tsn_ep_driver, and xilinx_tsn_ep.c matches ".compatible = \"xlnx,tsn-ep-mac\"", so this is only a transient mismatch between patches. The remaining sentence about the "companion DSA driver" refers to something that is not in-tree at any point of this series. Could that sentence be dropped or reworded until the DSA driver lands?
quoted hunk ↗ jump to hunk
+ + 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.odiff --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 @@
[ ... ]
+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);
+}
[Severity: Low]
The binding
Documentation/devicetree/bindings/net/xlnx,tsn-endpoint-ethernet-mac.yaml
lists xlnx,num-priorities (uint32, 2..8) in the required: list for the
"xlnx,tsn-endpoint-ethernet-mac-3.0" node:
xlnx,num-priorities:
$ref: /schemas/types.yaml#/definitions/uint32
minimum: 2
maximum: 8
tsn_ip_probe() is the only driver matching that compatible here, and it
does devm_kzalloc(), devm_clk_bulk_get(), clk_bulk_prepare_enable(),
devm_add_action_or_reset() and devm_of_platform_populate() without any
of_property_read_u32(), so the mandatory property is neither read nor
range-checked.
A later patch in this series ("net: xilinx: tsn: parse endpoint DMA
channel configuration") does consume it from the parent IP node in
xlnx_tsn_ep_probe():
ret = of_property_read_u32(ip_np, "xlnx,num-priorities", &num_prio);
...
if (num_tx != num_prio)
return dev_err_probe(dev, -EINVAL, ...);
so the binding/driver mismatch only exists between patches of this
series. Was leaving the property unconsumed by the wrapper itself
intentional?
+
+static const struct of_device_id tsn_of_match[] = {
+ { .compatible = "xlnx,tsn-endpoint-ethernet-mac-3.0" },
+ { }
+};
+MODULE_DEVICE_TABLE(of, tsn_of_match);[ ... ] -- Sashiko AI review · https://netdev-ai.bots.linux.dev/sashiko/#/patchset/20260909-patches_v2_external-v2-0-3a40babaff4c%40amd.com