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

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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: Lad 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: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Lad Prabhakar 2025-09-08 11:59:01 +01:00 committed by Jakub Kicinski
parent 264c26934f
commit 57e9e4d702
2 changed files with 58 additions and 5 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

12
drivers/net/ethernet/stmicro/stmmac/Kconfig
View File

@ -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"

51
drivers/net/ethernet/stmicro/stmmac/dwmac-renesas-gbeth.c
View File

@ -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 */ }
};