Hi Prabhakar,
Thanks for the patch.
> -----Original Message-----
> From: Prabhakar <prabhakar.csengg@xxxxxxxxx>
> Sent: 16 April 2025 11:40
> Subject: [PATCH net-next v7 3/4] net: stmmac: Add DWMAC glue layer for Renesas GBETH
>
> From: Lad Prabhakar <prabhakar.mahadev-lad.rj@xxxxxxxxxxxxxx>
>
> Add the DWMAC glue layer for the GBETH IP found in the Renesas RZ/V2H(P) SoC.
>
> Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@xxxxxxxxxxxxxx>
> Reviewed-by: Russell King (Oracle) <rmk+kernel@xxxxxxxxxxxxxxx>
> ---
> drivers/net/ethernet/stmicro/stmmac/Kconfig | 11 ++
> drivers/net/ethernet/stmicro/stmmac/Makefile | 1 +
> .../stmicro/stmmac/dwmac-renesas-gbeth.c | 146 ++++++++++++++++++
> 3 files changed, 158 insertions(+)
> create mode 100644 drivers/net/ethernet/stmicro/stmmac/dwmac-renesas-gbeth.c
>
> diff --git a/drivers/net/ethernet/stmicro/stmmac/Kconfig b/drivers/net/ethernet/stmicro/stmmac/Kconfig
> index 3c820ef56775..2c99b23f0faa 100644
> --- a/drivers/net/ethernet/stmicro/stmmac/Kconfig
> +++ b/drivers/net/ethernet/stmicro/stmmac/Kconfig
> @@ -131,6 +131,17 @@ config DWMAC_QCOM_ETHQOS
> This selects the Qualcomm ETHQOS glue layer support for the
> stmmac device driver.
>
> +config DWMAC_RENESAS_GBETH
> + tristate "Renesas RZ/V2H(P) GBETH support"
> + default ARCH_RENESAS
> + depends on OF && (ARCH_RENESAS || COMPILE_TEST)
> + help
> + Support for Gigabit Ethernet Interface (GBETH) on Renesas
> + RZ/V2H(P) SoCs.
> +
> + This selects the Renesas RZ/V2H(P) Soc specific glue layer support
> + for the stmmac device driver.
> +
> config DWMAC_ROCKCHIP
> tristate "Rockchip dwmac support"
> default ARCH_ROCKCHIP
> diff --git a/drivers/net/ethernet/stmicro/stmmac/Makefile
> b/drivers/net/ethernet/stmicro/stmmac/Makefile
> index 594883fb4164..91050215511b 100644
> --- a/drivers/net/ethernet/stmicro/stmmac/Makefile
> +++ b/drivers/net/ethernet/stmicro/stmmac/Makefile
> @@ -20,6 +20,7 @@ obj-$(CONFIG_DWMAC_LPC18XX) += dwmac-lpc18xx.o
> obj-$(CONFIG_DWMAC_MEDIATEK) += dwmac-mediatek.o
> obj-$(CONFIG_DWMAC_MESON) += dwmac-meson.o dwmac-meson8b.o
> obj-$(CONFIG_DWMAC_QCOM_ETHQOS) += dwmac-qcom-ethqos.o
> +obj-$(CONFIG_DWMAC_RENESAS_GBETH) += dwmac-renesas-gbeth.o
> obj-$(CONFIG_DWMAC_ROCKCHIP) += dwmac-rk.o
> obj-$(CONFIG_DWMAC_RZN1) += dwmac-rzn1.o
> obj-$(CONFIG_DWMAC_S32) += dwmac-s32.o
> diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac-renesas-gbeth.c
> b/drivers/net/ethernet/stmicro/stmmac/dwmac-renesas-gbeth.c
> new file mode 100644
> index 000000000000..f34bec7794e2
> --- /dev/null
> +++ b/drivers/net/ethernet/stmicro/stmmac/dwmac-renesas-gbeth.c
> @@ -0,0 +1,146 @@
> +// SPDX-License-Identifier: GPL-2.0+
> +/*
> + * dwmac-renesas-gbeth.c - DWMAC Specific Glue layer for Renesas GBETH
> + *
> + * The Rx and Tx clocks are supplied as follows for the GBETH IP.
> + *
> + * Rx / Tx
> + * -------+------------- on / off -------
> + * |
> + * | Rx-180 / Tx-180
> + * +---- not ---- on / off -------
> + *
> + * Copyright (C) 2025 Renesas Electronics Corporation */
> +
> +#include <linux/clk.h>
> +#include <linux/device.h>
> +#include <linux/module.h>
> +#include <linux/platform_device.h>
> +#include <linux/reset.h>
> +
> +#include "stmmac_platform.h"
> +
> +struct renesas_gbeth {
> + struct plat_stmmacenet_data *plat_dat;
> + struct reset_control *rstc;
> + struct device *dev;
> +};
> +
> +static const char *const renesas_gbeth_clks[] = {
> + "tx", "tx-180", "rx", "rx-180",
> +};
> +
> +static int renesas_gbeth_init(struct platform_device *pdev, void *priv)
> +{
> + struct plat_stmmacenet_data *plat_dat;
> + struct renesas_gbeth *gbeth = priv;
> + int ret;
> +
> + plat_dat = gbeth->plat_dat;
> +
> + ret = reset_control_deassert(gbeth->rstc);
> + if (ret) {
> + dev_err(gbeth->dev, "Reset deassert failed\n");
> + return ret;
> + }
> +
> + ret = clk_bulk_prepare_enable(plat_dat->num_clks,
> + plat_dat->clks);
> + if (ret)
> + reset_control_assert(gbeth->rstc);
> +
> + return 0;
return ret??
Cheers,
Biju
> +}
> +
> +static void renesas_gbeth_exit(struct platform_device *pdev, void
> +*priv) {
> + struct plat_stmmacenet_data *plat_dat;
> + struct renesas_gbeth *gbeth = priv;
> + int ret;
> +
> + plat_dat = gbeth->plat_dat;
> +
> + clk_bulk_disable_unprepare(plat_dat->num_clks, plat_dat->clks);
> +
> + ret = reset_control_assert(gbeth->rstc);
> + if (ret)
> + dev_err(gbeth->dev, "Reset assert failed\n"); }
> +
> +static int renesas_gbeth_probe(struct platform_device *pdev) {
> + struct plat_stmmacenet_data *plat_dat;
> + struct stmmac_resources stmmac_res;
> + struct device *dev = &pdev->dev;
> + struct renesas_gbeth *gbeth;
> + unsigned int i;
> + int err;
> +
> + err = stmmac_get_platform_resources(pdev, &stmmac_res);
> + if (err)
> + return dev_err_probe(dev, err,
> + "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),
> + "dt configuration failed\n");
> +
> + gbeth = devm_kzalloc(dev, sizeof(*gbeth), GFP_KERNEL);
> + if (!gbeth)
> + return -ENOMEM;
> +
> + plat_dat->num_clks = ARRAY_SIZE(renesas_gbeth_clks);
> + plat_dat->clks = devm_kcalloc(dev, plat_dat->num_clks,
> + sizeof(*plat_dat->clks), GFP_KERNEL);
> + if (!plat_dat->clks)
> + return -ENOMEM;
> +
> + for (i = 0; i < plat_dat->num_clks; i++)
> + plat_dat->clks[i].id = renesas_gbeth_clks[i];
> +
> + err = devm_clk_bulk_get(dev, plat_dat->num_clks, plat_dat->clks);
> + if (err < 0)
> + return err;
> +
> + plat_dat->clk_tx_i = stmmac_pltfr_find_clk(plat_dat, "tx");
> + if (!plat_dat->clk_tx_i)
> + return dev_err_probe(dev, -EINVAL,
> + "error finding tx clock\n");
> +
> + gbeth->rstc = devm_reset_control_get_exclusive(dev, NULL);
> + if (IS_ERR(gbeth->rstc))
> + return PTR_ERR(gbeth->rstc);
> +
> + gbeth->dev = dev;
> + gbeth->plat_dat = plat_dat;
> + plat_dat->bsp_priv = gbeth;
> + plat_dat->set_clk_tx_rate = stmmac_set_clk_tx_rate;
> + plat_dat->init = renesas_gbeth_init;
> + plat_dat->exit = renesas_gbeth_exit;
> + plat_dat->flags |= STMMAC_FLAG_HWTSTAMP_CORRECT_LATENCY |
> + STMMAC_FLAG_EN_TX_LPI_CLK_PHY_CAP |
> + STMMAC_FLAG_SPH_DISABLE;
> +
> + return devm_stmmac_pltfr_probe(pdev, plat_dat, &stmmac_res); }
> +
> +static const struct of_device_id renesas_gbeth_match[] = {
> + { .compatible = "renesas,rzv2h-gbeth", },
> + { /* Sentinel */ }
> +};
> +MODULE_DEVICE_TABLE(of, renesas_gbeth_match);
> +
> +static struct platform_driver renesas_gbeth_driver = {
> + .probe = renesas_gbeth_probe,
> + .driver = {
> + .name = "renesas-gbeth",
> + .of_match_table = renesas_gbeth_match,
> + },
> +};
> +module_platform_driver(renesas_gbeth_driver);
> +
> +MODULE_AUTHOR("Lad Prabhakar
> +<prabhakar.mahadev-lad.rj@xxxxxxxxxxxxxx>");
> +MODULE_DESCRIPTION("Renesas GBETH DWMAC Specific Glue layer");
> +MODULE_LICENSE("GPL");
> --
> 2.49.0
