Commit 57e9e4d7 authored by Lad Prabhakar's avatar Lad Prabhakar Committed by Jakub Kicinski
Browse files

net: stmmac: dwmac-renesas-gbeth: Add support for RZ/T2H SoC 



Extend the Renesas GBETH stmmac glue driver to support the RZ/T2H SoC,
where the GMAC is connected through a MIIC PCS. Introduce a new
`has_pcs` flag in `struct renesas_gbeth_of_data` to indicate when PCS
handling is required.

When enabled, the driver parses the `pcs-handle` phandle, creates a PCS
instance with `miic_create()`, and wires it into phylink. Proper cleanup
is done with `miic_destroy()`. New init/exit/select hooks are added to
`plat_stmmacenet_data` for PCS integration.

Update Kconfig to select `PCS_RZN1_MIIC` when building the Renesas GBETH
driver so the PCS support is always available.

Signed-off-by: default avatarLad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
Link: https://patch.msgid.link/20250908105901.3198975-4-prabhakar.mahadev-lad.rj@bp.renesas.com


Signed-off-by: default avatarJakub Kicinski <kuba@kernel.org>
parent 264c2693

drivers/net/ethernet/stmicro/stmmac/Kconfig

+7 −5
Original line number Diff line number Diff line
@@ -133,15 +133,17 @@ config DWMAC_QCOM_ETHQOS 
	  stmmac device driver.



config DWMAC_RENESAS_GBETH

	tristate "Renesas RZ/V2H(P) GBETH support"

	tristate "Renesas RZ/V2H(P) GBETH and RZ/T2H, RZ/N2H GMAC support"

	default ARCH_RENESAS

	depends on OF && (ARCH_RENESAS || COMPILE_TEST)

	select PCS_RZN1_MIIC

	help

	  Support for Gigabit Ethernet Interface (GBETH) on Renesas

	  RZ/V2H(P) SoCs.

	  Support for Gigabit Ethernet Interface (GBETH)/ Ethernet MAC (GMAC)

	  on Renesas SoCs.



	  This selects the Renesas RZ/V2H(P) Soc specific glue layer support

	  for the stmmac device driver.

	  This selects Renesas SoC glue layer support for the stmmac device

	  driver. This driver is used for the RZ/V2H(P) family, RZ/T2H and

	  RZ/N2H SoCs.



config DWMAC_ROCKCHIP

	tristate "Rockchip dwmac support"

drivers/net/ethernet/stmicro/stmmac/dwmac-renesas-gbeth.c

+51 −0
Original line number Diff line number Diff line
@@ -17,6 +17,7 @@ 
#include <linux/device.h>

#include <linux/module.h>

#include <linux/of.h>

#include <linux/pcs-rzn1-miic.h>

#include <linux/platform_device.h>

#include <linux/reset.h>

#include <linux/types.h>
@@ -33,6 +34,7 @@ 
 *                handled by the glue driver or core driver.

 * @set_clk_tx_rate: Flag to indicate if Tx clock is fixed or

 *                   set_clk_tx_rate is needed.

 * @has_pcs: Flag to indicate if the MAC has a PCS

 */

struct renesas_gbeth_of_data {

	const char * const *clks;
@@ -40,6 +42,7 @@ struct renesas_gbeth_of_data { 
	u32 stmmac_flags;

	bool handle_reset;

	bool set_clk_tx_rate;

	bool has_pcs;

};



struct renesas_gbeth {
@@ -53,6 +56,41 @@ static const char *const renesas_gbeth_clks[] = { 
	"tx", "tx-180", "rx", "rx-180",

};



static const char *const renesas_gmac_clks[] = {

	"tx",

};



static int renesas_gmac_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 renesas_gmac_pcs_exit(struct stmmac_priv *priv)

{

	if (priv->hw->phylink_pcs)

		miic_destroy(priv->hw->phylink_pcs);

}



static struct phylink_pcs *renesas_gmac_select_pcs(struct stmmac_priv *priv,

						   phy_interface_t interface)

{

	return priv->hw->phylink_pcs;

}



static int renesas_gbeth_init(struct platform_device *pdev, void *priv)

{

	struct plat_stmmacenet_data *plat_dat;
@@ -150,6 +188,11 @@ static int renesas_gbeth_probe(struct platform_device *pdev) 
	plat_dat->exit = renesas_gbeth_exit;

	plat_dat->flags |= STMMAC_FLAG_EN_TX_LPI_CLK_PHY_CAP |

			   gbeth->of_data->stmmac_flags;

	if (of_data->has_pcs) {

		plat_dat->pcs_init = renesas_gmac_pcs_init;

		plat_dat->pcs_exit = renesas_gmac_pcs_exit;

		plat_dat->select_pcs = renesas_gmac_select_pcs;

	}



	return devm_stmmac_pltfr_probe(pdev, plat_dat, &stmmac_res);

}
@@ -163,7 +206,15 @@ static const struct renesas_gbeth_of_data renesas_gbeth_of_data = { 
			STMMAC_FLAG_SPH_DISABLE,

};



static const struct renesas_gbeth_of_data renesas_gmac_of_data = {

	.clks = renesas_gmac_clks,

	.num_clks = ARRAY_SIZE(renesas_gmac_clks),

	.stmmac_flags = STMMAC_FLAG_HWTSTAMP_CORRECT_LATENCY,

	.has_pcs = true,

};



static const struct of_device_id renesas_gbeth_match[] = {

	{ .compatible = "renesas,r9a09g077-gbeth", .data = &renesas_gmac_of_data },

	{ .compatible = "renesas,rzv2h-gbeth", .data = &renesas_gbeth_of_data },

	{ /* Sentinel */ }

};