[PATCH net-next 3/3] net: stmmac: Add UltraRISC DP1000 GMAC support
Maxime Chevallier
maxime.chevallier at bootlin.com
Tue Sep 1 00:29:51 PDT 2026
Hello,
On 9/1/26 03:27, Jia Wang wrote:
> The DP1000 GMAC integration provides fixed TX and RX RGMII clock delays
> that cannot be disabled. For boards without PCB delays, "rgmii-id"
> describes the link, but passing that mode unchanged to the PHY would enable
> a second set of delays.
>
> Use phy_fix_phy_mode_for_mac_delays() to translate "rgmii-id" to "rgmii"
> before attaching the PHY. Reject other RGMII modes because the fixed MAC
> delays cannot be combined with them without duplicating or omitting a
> delay.
>
> Signed-off-by: Jia Wang <wangjia at ultrarisc.com>
Simple enough, this is nice :)
One thing, I'm going to start requiring this for new glue drivers, can you give
the output of "ethtool -t eth0" on your device with this new glue driver ?
You'll have to enable CONFIG_STMMAC_SELFTESTS
As this is is a 5.20, I'm expecting you'll get something like :
1. MAC Loopback 0
2. MMC Counters 0
3. EEE -95
4. Hash Filter MC 0
5. Perfect Filter UC 0
6. MC Filter 0
7. UC Filter 0
8. Flow Control -95
9. RSS -95
10. VLAN Filtering -110
11. VLAN Filtering (perf) -110
12. Double VLAN Filter -110
13. Double VLAN Filter (perf) -110
14. Flexible RX Parser -95
15. SA Insertion (desc) 0
16. SA Replacement (desc) 0
17. SA Insertion (reg) 0
18. SA Replacement (reg) 0
19. VLAN TX Insertion -110
20. SVLAN TX Insertion -95
21. L3 DA Filtering -95
22. L3 SA Filtering -95
23. L4 DA TCP Filtering -95
24. L4 SA TCP Filtering -95
25. L4 DA UDP Filtering -95
26. L4 SA UDP Filtering -95
27. ARP Offload -110
28. Jumbo Frame 0
29. Multichannel Jumbo -95
30. Split Header -95
31. TBS (ETF Scheduler) -95
-95 (-EOPNOTSUP) and 0 are OK, watch for any other values.
If ARP Offload and any VLAN selftest (insertion and filtering), this is a known
issue and you can ignore :)
Maxime
> ---
> MAINTAINERS | 1 +
> drivers/net/ethernet/stmicro/stmmac/Kconfig | 11 +++++
> drivers/net/ethernet/stmicro/stmmac/Makefile | 1 +
> .../net/ethernet/stmicro/stmmac/dwmac-ultrarisc.c | 54 ++++++++++++++++++++++
> 4 files changed, 67 insertions(+)
>
> diff --git a/MAINTAINERS b/MAINTAINERS
> index 3b96ff0734e6..aacbab369b51 100644
> --- a/MAINTAINERS
> +++ b/MAINTAINERS
> @@ -28008,6 +28008,7 @@ ULTRARISC DP1000 DWMAC GLUE LAYER
> M: Jia Wang <wangjia at ultrarisc.com>
> S: Maintained
> F: Documentation/devicetree/bindings/net/ultrarisc,dp1000-gmac.yaml
> +F: drivers/net/ethernet/stmicro/stmmac/dwmac-ultrarisc.c
>
> ULTRARISC DP1000 PINCTRL DRIVER
> M: Jia Wang <wangjia at ultrarisc.com>
> diff --git a/drivers/net/ethernet/stmicro/stmmac/Kconfig b/drivers/net/ethernet/stmicro/stmmac/Kconfig
> index e3dd5adda5ac..ab3c4cf96423 100644
> --- a/drivers/net/ethernet/stmicro/stmmac/Kconfig
> +++ b/drivers/net/ethernet/stmicro/stmmac/Kconfig
> @@ -319,6 +319,17 @@ config DWMAC_THEAD
> the stmmac device driver. This driver is used for T-HEAD TH1520
> ethernet controller.
>
> +config DWMAC_ULTRARISC
> + tristate "UltraRISC DWMAC support"
> + default ARCH_ULTRARISC
> + depends on OF && (ARCH_ULTRARISC || COMPILE_TEST)
> + help
> + Support for the Ethernet controller on the UltraRISC DP1000 SoC.
> +
> + This selects the UltraRISC platform specific glue layer support
> + for the stmmac device driver. This driver is used for the DP1000
> + GMAC Ethernet controller.
> +
> config DWMAC_IMX8
> tristate "NXP IMX8 DWMAC support"
> default ARCH_MXC
> diff --git a/drivers/net/ethernet/stmicro/stmmac/Makefile b/drivers/net/ethernet/stmicro/stmmac/Makefile
> index a1cea2f57252..b16a456b730e 100644
> --- a/drivers/net/ethernet/stmicro/stmmac/Makefile
> +++ b/drivers/net/ethernet/stmicro/stmmac/Makefile
> @@ -36,6 +36,7 @@ obj-$(CONFIG_DWMAC_SUNXI) += dwmac-sunxi.o
> obj-$(CONFIG_DWMAC_SUN8I) += dwmac-sun8i.o
> obj-$(CONFIG_DWMAC_SUN55I) += dwmac-sun55i.o
> obj-$(CONFIG_DWMAC_THEAD) += dwmac-thead.o
> +obj-$(CONFIG_DWMAC_ULTRARISC) += dwmac-ultrarisc.o
> obj-$(CONFIG_DWMAC_DWC_QOS_ETH) += dwmac-dwc-qos-eth.o
> obj-$(CONFIG_DWMAC_INTEL_PLAT) += dwmac-intel-plat.o
> obj-$(CONFIG_DWMAC_LOONGSON1) += dwmac-loongson1.o
> diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac-ultrarisc.c b/drivers/net/ethernet/stmicro/stmmac/dwmac-ultrarisc.c
> new file mode 100644
> index 000000000000..4bdda2665338
> --- /dev/null
> +++ b/drivers/net/ethernet/stmicro/stmmac/dwmac-ultrarisc.c
> @@ -0,0 +1,54 @@
> +// SPDX-License-Identifier: GPL-2.0-only
> +/*
> + * UltraRISC DWMAC platform driver
> + *
> + * Copyright (C) 2026 UltraRISC Technology (Shanghai) Co., Ltd.
> + */
> +
> +#include <linux/module.h>
> +#include <linux/phy.h>
> +#include <linux/platform_device.h>
> +
> +#include "stmmac_platform.h"
> +
> +static int ultrarisc_dwmac_probe(struct platform_device *pdev)
> +{
> + struct plat_stmmacenet_data *plat_dat;
> + struct stmmac_resources stmmac_res;
> + struct device *dev = &pdev->dev;
> + int ret;
> +
> + ret = stmmac_get_platform_resources(pdev, &stmmac_res);
> + if (ret)
> + return dev_err_probe(dev, ret, "failed to get resources\n");
> +
> + plat_dat = devm_stmmac_probe_config_dt(pdev, stmmac_res.mac);
> + if (IS_ERR(plat_dat))
> + return dev_err_probe(dev, PTR_ERR(plat_dat), "failed to parse DT parameters\n");
> +
> + plat_dat->phy_interface =
> + phy_fix_phy_mode_for_mac_delays(plat_dat->phy_interface, true, true);
> + if (plat_dat->phy_interface == PHY_INTERFACE_MODE_NA)
> + return dev_err_probe(dev, -EINVAL, "unsupported phy interface mode\n");
> +
> + return devm_stmmac_pltfr_probe(pdev, plat_dat, &stmmac_res);
> +}
> +
> +static const struct of_device_id ultrarisc_dwmac_match[] = {
> + { .compatible = "ultrarisc,dp1000-gmac" },
> + { }
> +};
> +MODULE_DEVICE_TABLE(of, ultrarisc_dwmac_match);
> +
> +static struct platform_driver ultrarisc_dwmac_driver = {
> + .probe = ultrarisc_dwmac_probe,
> + .driver = {
> + .name = "ultrarisc-dwmac",
> + .pm = &stmmac_pltfr_pm_ops,
> + .of_match_table = ultrarisc_dwmac_match,
> + },
> +};
> +module_platform_driver(ultrarisc_dwmac_driver);
> +
> +MODULE_DESCRIPTION("UltraRISC DWMAC platform driver");
> +MODULE_LICENSE("GPL");
>
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