[PATCH net-next v7 6/7] net: stmmac: add support for RZ/N1 GMAC

[Hariprasad Kelam]

> Subject: [EXTERNAL] [PATCH net-next v7 6/7] net: stmmac: add support for
> RZ/N1 GMAC
> 
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> before clicking links or opening attachments
> 
> ----------------------------------------------------------------------
> From: Clément Léger <clement.leger at bootlin.com>
> 
> Add support for the Renesas RZ/N1 GMAC. This support can make use of a
> custom RZ/N1 PCS which is fetched by parsing the pcs-handle device tree
> property.
> 
> Signed-off-by: Clément Léger <clement.leger at bootlin.com>
> Co-developed-by: Romain Gantois <romain.gantois at bootlin.com>
> Signed-off-by: Romain Gantois <romain.gantois at bootlin.com>
> Reviewed-by: Russell King (Oracle) <rmk+kernel at armlinux.org.uk>
> ---
>  MAINTAINERS                                      |  6 ++
>  drivers/net/ethernet/stmicro/stmmac/Kconfig      | 12 ++++
>  drivers/net/ethernet/stmicro/stmmac/Makefile     |  1 +
>  drivers/net/ethernet/stmicro/stmmac/dwmac-rzn1.c | 86
> ++++++++++++++++++++++++
>  4 files changed, 105 insertions(+)
> 
> diff --git a/MAINTAINERS b/MAINTAINERS
> index b81b2be60b774..95bb09aacf181 100644
> --- a/MAINTAINERS
> +++ b/MAINTAINERS
> @@ -18868,6 +18868,12 @@ F:	include/dt-bindings/net/pcs-rzn1-
> miic.h
>  F:	include/linux/pcs-rzn1-miic.h
>  F:	net/dsa/tag_rzn1_a5psw.c
> 
> +RENESAS RZ/N1 DWMAC GLUE LAYER
> +M:	Romain Gantois <romain.gantois at bootlin.com>
> +S:	Maintained
> +F:	Documentation/devicetree/bindings/net/renesas,rzn1-gmac.yaml
> +F:	drivers/net/ethernet/stmicro/stmmac/dwmac-rzn1.c
> +
>  RENESAS RZ/N1 RTC CONTROLLER DRIVER
>  M:	Miquel Raynal <miquel.raynal at bootlin.com>
>  L:	linux-rtc at vger.kernel.org
> diff --git a/drivers/net/ethernet/stmicro/stmmac/Kconfig
> b/drivers/net/ethernet/stmicro/stmmac/Kconfig
> index 4ec61f1ee71a2..05cc07b8f48c0 100644
> --- a/drivers/net/ethernet/stmicro/stmmac/Kconfig
> +++ b/drivers/net/ethernet/stmicro/stmmac/Kconfig
> @@ -142,6 +142,18 @@ config DWMAC_ROCKCHIP
>  	  This selects the Rockchip RK3288 SoC glue layer support for
>  	  the stmmac device driver.
> 
> +config DWMAC_RZN1
> +	tristate "Renesas RZ/N1 dwmac support"
> +	default ARCH_RZN1
> +	depends on OF && (ARCH_RZN1 || COMPILE_TEST)
> +	select PCS_RZN1_MIIC
> +	help
> +	  Support for Ethernet controller on Renesas RZ/N1 SoC family.
> +
> +	  This selects the Renesas RZ/N1 SoC glue layer support for
> +	  the stmmac device driver. This support can make use of a custom
> MII
> +	  converter PCS device.
> +
>  config DWMAC_SOCFPGA
>  	tristate "SOCFPGA dwmac support"
>  	default ARCH_INTEL_SOCFPGA
> diff --git a/drivers/net/ethernet/stmicro/stmmac/Makefile
> b/drivers/net/ethernet/stmicro/stmmac/Makefile
> index 26cad4344701e..c2f0e91f6bf83 100644
> --- a/drivers/net/ethernet/stmicro/stmmac/Makefile
> +++ b/drivers/net/ethernet/stmicro/stmmac/Makefile
> @@ -21,6 +21,7 @@ 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_ROCKCHIP)	+= dwmac-rk.o
> +obj-$(CONFIG_DWMAC_RZN1)	+= dwmac-rzn1.o
>  obj-$(CONFIG_DWMAC_SOCFPGA)	+= dwmac-altr-socfpga.o
>  obj-$(CONFIG_DWMAC_STARFIVE)	+= dwmac-starfive.o
>  obj-$(CONFIG_DWMAC_STI)		+= dwmac-sti.o
> diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac-rzn1.c
> b/drivers/net/ethernet/stmicro/stmmac/dwmac-rzn1.c
> new file mode 100644
> index 0000000000000..848cf3c01f4ab
> --- /dev/null
> +++ b/drivers/net/ethernet/stmicro/stmmac/dwmac-rzn1.c
> @@ -0,0 +1,86 @@
> +// SPDX-License-Identifier: GPL-2.0-or-later
> +/*
> + * Copyright (C) 2024 Schneider-Electric
> + *
> + * Clément Léger <clement.leger at bootlin.com>  */
> +
> +#include <linux/of.h>
> +#include <linux/pcs-rzn1-miic.h>
> +#include <linux/phylink.h>
> +#include <linux/platform_device.h>
> +
> +#include "stmmac_platform.h"
> +#include "stmmac.h"
> +
> +static int rzn1_dwmac_pcs_init(struct stmmac_priv *priv) {
> +	struct device_node *np = priv->device->of_node;
> +	struct device_node *pcs_node;
> +	struct phylink_pcs *pcs;
> +
> +	pcs_node = of_parse_phandle(np, "pcs-handle", 0);
> +
> +	if (pcs_node) {
> +		pcs = miic_create(priv->device, pcs_node);
> +		of_node_put(pcs_node);
> +		if (IS_ERR(pcs))
> +			return PTR_ERR(pcs);
> +
> +		priv->hw->phylink_pcs = pcs;
> +	}
> +
> +	return 0;
> +}
> +
> +static void rzn1_dwmac_pcs_exit(struct stmmac_priv *priv) {
> +	if (priv->hw->phylink_pcs)
> +		miic_destroy(priv->hw->phylink_pcs);
> +}
> +
> +static int rzn1_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 ret;
> +
> +	plat_dat = devm_stmmac_probe_config_dt(pdev, stmmac_res.mac);
> +	if (IS_ERR(plat_dat))
> +		return PTR_ERR(plat_dat);
> +
> +	plat_dat->bsp_priv = plat_dat;
> +	plat_dat->pcs_init = rzn1_dwmac_pcs_init;
> +	plat_dat->pcs_exit = rzn1_dwmac_pcs_exit;
> +
> +	ret = stmmac_dvr_probe(dev, plat_dat, &stmmac_res);
> +	if (ret)
> +		return ret;
> +
> +	return 0;
> +}
> +
> +static const struct of_device_id rzn1_dwmac_match[] = {
> +	{ .compatible = "renesas,rzn1-gmac" },
> +	{ }
> +};
> +MODULE_DEVICE_TABLE(of, rzn1_dwmac_match);
> +
> +static struct platform_driver rzn1_dwmac_driver = {
> +	.probe  = rzn1_dwmac_probe,
> +	.remove_new = stmmac_pltfr_remove,
> +	.driver = {
> +		.name           = "rzn1-dwmac",
> +		.of_match_table = rzn1_dwmac_match,
> +	},
> +};
> +module_platform_driver(rzn1_dwmac_driver);
> +
> +MODULE_AUTHOR("Clément Léger <clement.leger at bootlin.com>");
> +MODULE_DESCRIPTION("Renesas RZN1 DWMAC specific glue layer");
> +MODULE_LICENSE("GPL");
> 
> --
> 2.44.0
> 
Reviewed-by: Hariprasad Kelam <hkelam at marvell.com>