Merge branch 'net-lan969x-add-rgmii-support'

Daniel Machon says:

====================
net: lan969x: add RGMII support

== Description:

This series is the fourth of a multi-part series, that prepares and adds
support for the new lan969x switch driver.

The upstreaming efforts is split into multiple series (might change a
bit as we go along):

1) Prepare the Sparx5 driver for lan969x (merged)

2) Add support for lan969x (same basic features as Sparx5
provides excl. FDMA and VCAP, merged).

3) Add lan969x VCAP functionality (merged).

--> 4) Add RGMII support.

5) Add FDMA support.

== RGMII support:

The lan969x switch device includes two RGMII port interfaces (port 28
and 29) supporting data speeds of 1 Gbps, 100 Mbps and 10 Mbps.

== Patch breakdown:

Patch #1 does some preparation work.

Patch #2 adds new function: is_port_rgmii() to the match data ops.

Patch #3 uses the is_port_rgmii() in a number of places.

Patch #4 makes sure that we do not configure an RGMII device as a
low-speed device, when doing a port config.

Patch #5 makes sure we only return the PCS if the port mode requires
it.

Patch #6 adds checks for RGMII PHY modes in sparx5_verify_speeds().

Patch #7 adds registers required to configure RGMII.

Patch #8 adds RGMII implementation.

Patch #9 documents RGMII delays in the dt-bindings.

Details are in the commit description of the individual patches

v4: https://lore.kernel.org/[e-mail]
v3: https://lore.kernel.org/[e-mail]
v2: https://lore.kernel.org/[e-mail]
v1: https://lore.kernel.org/[e-mail]
====================

Link: https://patch.msgid.link/[e-mail]
Signed-off-by: Jakub Kicinski <[e-mail]>

Documentation/devicetree/bindings/net/microchip,sparx5-switch.yaml

···
             minimum: 0
             maximum: 383
 
+          rx-internal-delay-ps:
+            description:
+              RGMII Receive Clock Delay defined in pico seconds, used to select
+              the DLL phase shift between 1000 ps (45 degree shift at 1Gbps) and
+              3300 ps (147 degree shift at 1Gbps). A value of 0 ps will disable
+              any delay. The Default is no delay.
+            enum: [0, 1000, 1700, 2000, 2500, 3000, 3300]
+            default: 0
+
+          tx-internal-delay-ps:
+            description:
+              RGMII Transmit Clock Delay defined in pico seconds, used to select
+              the DLL phase shift between 1000 ps (45 degree shift at 1Gbps) and
+              3300 ps (147 degree shift at 1Gbps). A value of 0 ps will disable
+              any delay. The Default is no delay.
+            enum: [0, 1000, 1700, 2000, 2500, 3000, 3300]
+            default: 0
+
         required:
           - reg
           - phys

drivers/net/ethernet/microchip/sparx5/Makefile

···
 					  lan969x/lan969x.o \
 					  lan969x/lan969x_calendar.o \
 					  lan969x/lan969x_vcap_ag_api.o \
-					  lan969x/lan969x_vcap_impl.o
+					  lan969x/lan969x_vcap_impl.o \
+					  lan969x/lan969x_rgmii.o
 
 # Provide include files
 ccflags-y += -I$(srctree)/drivers/net/ethernet/microchip/vcap

drivers/net/ethernet/microchip/sparx5/lan969x/lan969x.c

···
 	{ TARGET_DEV2G5 + 27,         0x30d8000, 1 }, /* 0xe30d8000 */
 	{ TARGET_DEV10G +  9,         0x30dc000, 1 }, /* 0xe30dc000 */
 	{ TARGET_PCS10G_BR +  9,      0x30e0000, 1 }, /* 0xe30e0000 */
+	{ TARGET_DEVRGMII,            0x30e4000, 1 }, /* 0xe30e4000 */
+	{ TARGET_DEVRGMII +  1,       0x30e8000, 1 }, /* 0xe30e8000 */
 	{ TARGET_DSM,                 0x30ec000, 1 }, /* 0xe30ec000 */
 	{ TARGET_PORT_CONF,           0x30f0000, 1 }, /* 0xe30f0000 */
 	{ TARGET_ASM,                 0x3200000, 1 }, /* 0xe3200000 */
+	{ TARGET_HSIO_WRAP,           0x3408000, 1 }, /* 0xe3408000 */
 };
 
 static struct sparx5_sdlb_group lan969x_sdlb_groups[LAN969X_SDLB_GRP_CNT] = {
···
 	.is_port_5g              = &lan969x_port_is_5g,
 	.is_port_10g             = &lan969x_port_is_10g,
 	.is_port_25g             = &lan969x_port_is_25g,
+	.is_port_rgmii           = &lan969x_port_is_rgmii,
 	.get_port_dev_index      = &lan969x_port_dev_mapping,
 	.get_port_dev_bit        = &lan969x_get_dev_mode_bit,
 	.get_hsch_max_group_rate = &lan969x_get_hsch_max_group_rate,
···
 	.set_port_mux            = &lan969x_port_mux_set,
 	.ptp_irq_handler         = &lan969x_ptp_irq_handler,
 	.dsm_calendar_calc       = &lan969x_dsm_calendar_calc,
+	.port_config_rgmii       = &lan969x_port_config_rgmii,
 };
 
 const struct sparx5_match_data lan969x_desc = {

drivers/net/ethernet/microchip/sparx5/lan969x/lan969x.h

···
 	return false;
 }
 
+static inline bool lan969x_port_is_rgmii(int portno)
+{
+	return portno == 28 || portno == 29;
+}
+
 /* lan969x_calendar.c */
 int lan969x_dsm_calendar_calc(struct sparx5 *sparx5, u32 taxi,
 			      struct sparx5_calendar_data *data);
+
+/* lan969x_rgmii.c */
+int lan969x_port_config_rgmii(struct sparx5_port *port,
+			      struct sparx5_port_config *conf);
+
 #endif

drivers/net/ethernet/microchip/sparx5/lan969x/lan969x_rgmii.c

···
+// SPDX-License-Identifier: GPL-2.0+
+/* Microchip lan969x Switch driver
+ *
+ * Copyright (c) 2024 Microchip Technology Inc. and its subsidiaries.
+ */
+
+#include "lan969x.h"
+
+/* Tx clock selectors */
+#define LAN969X_RGMII_TX_CLK_SEL_125MHZ 1  /* 1000Mbps */
+#define LAN969X_RGMII_TX_CLK_SEL_25MHZ  2  /* 100Mbps */
+#define LAN969X_RGMII_TX_CLK_SEL_2M5MHZ 3  /* 10Mbps */
+
+/* Port speed selectors */
+#define LAN969X_RGMII_SPEED_SEL_10 0   /* Select 10Mbps speed */
+#define LAN969X_RGMII_SPEED_SEL_100 1  /* Select 100Mbps speed */
+#define LAN969X_RGMII_SPEED_SEL_1000 2 /* Select 1000Mbps speed */
+
+/* Clock delay selectors */
+#define LAN969X_RGMII_CLK_DELAY_SEL_1_0_NS 2  /* Phase shift 45deg */
+#define LAN969X_RGMII_CLK_DELAY_SEL_1_7_NS 3  /* Phase shift 77deg */
+#define LAN969X_RGMII_CLK_DELAY_SEL_2_0_NS 4  /* Phase shift 90deg */
+#define LAN969X_RGMII_CLK_DELAY_SEL_2_5_NS 5  /* Phase shift 112deg */
+#define LAN969X_RGMII_CLK_DELAY_SEL_3_0_NS 6  /* Phase shift 135deg */
+#define LAN969X_RGMII_CLK_DELAY_SEL_3_3_NS 7  /* Phase shift 147deg */
+
+#define LAN969X_RGMII_PORT_START_IDX 28 /* Index of the first RGMII port */
+#define LAN969X_RGMII_IFG_TX 4          /* TX Inter Frame Gap value */
+#define LAN969X_RGMII_IFG_RX1 5         /* RX1 Inter Frame Gap value */
+#define LAN969X_RGMII_IFG_RX2 1         /* RX2 Inter Frame Gap value */
+
+#define RGMII_PORT_IDX(port) ((port)->portno - LAN969X_RGMII_PORT_START_IDX)
+
+/* Get the tx clock selector based on the port speed. */
+static int lan969x_rgmii_get_clk_sel(int speed)
+{
+	return (speed == SPEED_10  ? LAN969X_RGMII_TX_CLK_SEL_2M5MHZ :
+		speed == SPEED_100 ? LAN969X_RGMII_TX_CLK_SEL_25MHZ :
+				     LAN969X_RGMII_TX_CLK_SEL_125MHZ);
+}
+
+/* Get the port speed selector based on the port speed. */
+static int lan969x_rgmii_get_speed_sel(int speed)
+{
+	return (speed == SPEED_10  ? LAN969X_RGMII_SPEED_SEL_10 :
+		speed == SPEED_100 ? LAN969X_RGMII_SPEED_SEL_100 :
+				     LAN969X_RGMII_SPEED_SEL_1000);
+}
+
+/* Get the clock delay selector based on the clock delay in picoseconds. */
+static int lan969x_rgmii_get_clk_delay_sel(struct sparx5_port *port,
+					   u32 delay_ps, u32 *clk_delay_sel)
+{
+	switch (delay_ps) {
+	case 0:
+		/* Hardware default selector. */
+		*clk_delay_sel = LAN969X_RGMII_CLK_DELAY_SEL_2_5_NS;
+		break;
+	case 1000:
+		*clk_delay_sel = LAN969X_RGMII_CLK_DELAY_SEL_1_0_NS;
+		break;
+	case 1700:
+		*clk_delay_sel = LAN969X_RGMII_CLK_DELAY_SEL_1_7_NS;
+		break;
+	case 2000:
+		*clk_delay_sel = LAN969X_RGMII_CLK_DELAY_SEL_2_0_NS;
+		break;
+	case 2500:
+		*clk_delay_sel = LAN969X_RGMII_CLK_DELAY_SEL_2_5_NS;
+		break;
+	case 3000:
+		*clk_delay_sel = LAN969X_RGMII_CLK_DELAY_SEL_3_0_NS;
+		break;
+	case 3300:
+		*clk_delay_sel = LAN969X_RGMII_CLK_DELAY_SEL_3_3_NS;
+		break;
+	default:
+		dev_err(port->sparx5->dev, "Invalid RGMII delay: %u", delay_ps);
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+/* Configure the RGMII tx clock frequency. */
+static void lan969x_rgmii_tx_clk_config(struct sparx5_port *port,
+					struct sparx5_port_config *conf)
+{
+	u32 clk_sel = lan969x_rgmii_get_clk_sel(conf->speed);
+	u32 idx = RGMII_PORT_IDX(port);
+
+	/* Take the RGMII clock domain out of reset and set tx clock
+	 * frequency.
+	 */
+	spx5_rmw(HSIO_WRAP_RGMII_CFG_TX_CLK_CFG_SET(clk_sel) |
+		 HSIO_WRAP_RGMII_CFG_RGMII_TX_RST_SET(0) |
+		 HSIO_WRAP_RGMII_CFG_RGMII_RX_RST_SET(0),
+		 HSIO_WRAP_RGMII_CFG_TX_CLK_CFG |
+		 HSIO_WRAP_RGMII_CFG_RGMII_TX_RST |
+		 HSIO_WRAP_RGMII_CFG_RGMII_RX_RST,
+		 port->sparx5, HSIO_WRAP_RGMII_CFG(idx));
+}
+
+/* Configure the RGMII port device. */
+static void lan969x_rgmii_port_device_config(struct sparx5_port *port,
+					     struct sparx5_port_config *conf)
+{
+	u32 dtag, dotag, etype, speed_sel, idx = RGMII_PORT_IDX(port);
+
+	speed_sel = lan969x_rgmii_get_speed_sel(conf->speed);
+
+	etype = (port->vlan_type == SPX5_VLAN_PORT_TYPE_S_CUSTOM ?
+		 port->custom_etype :
+		 port->vlan_type == SPX5_VLAN_PORT_TYPE_C ?
+		 ETH_P_8021Q : ETH_P_8021AD);
+
+	dtag = port->max_vlan_tags == SPX5_PORT_MAX_TAGS_TWO;
+	dotag = port->max_vlan_tags != SPX5_PORT_MAX_TAGS_NONE;
+
+	/* Enable the MAC. */
+	spx5_wr(DEVRGMII_MAC_ENA_CFG_RX_ENA_SET(1) |
+		DEVRGMII_MAC_ENA_CFG_TX_ENA_SET(1),
+		port->sparx5, DEVRGMII_MAC_ENA_CFG(idx));
+
+	/* Configure the Inter Frame Gap. */
+	spx5_wr(DEVRGMII_MAC_IFG_CFG_TX_IFG_SET(LAN969X_RGMII_IFG_TX) |
+		DEVRGMII_MAC_IFG_CFG_RX_IFG1_SET(LAN969X_RGMII_IFG_RX1) |
+		DEVRGMII_MAC_IFG_CFG_RX_IFG2_SET(LAN969X_RGMII_IFG_RX2),
+		port->sparx5, DEVRGMII_MAC_IFG_CFG(idx));
+
+	/* Configure port data rate. */
+	spx5_wr(DEVRGMII_DEV_RST_CTRL_SPEED_SEL_SET(speed_sel),
+		port->sparx5, DEVRGMII_DEV_RST_CTRL(idx));
+
+	/* Configure VLAN awareness. */
+	spx5_wr(DEVRGMII_MAC_TAGS_CFG_TAG_ID_SET(etype) |
+		DEVRGMII_MAC_TAGS_CFG_PB_ENA_SET(dtag) |
+		DEVRGMII_MAC_TAGS_CFG_VLAN_AWR_ENA_SET(dotag) |
+		DEVRGMII_MAC_TAGS_CFG_VLAN_LEN_AWR_ENA_SET(dotag),
+		port->sparx5,
+		DEVRGMII_MAC_TAGS_CFG(idx));
+}
+
+/* Configure the RGMII delay lines in the MAC.
+ *
+ * We use the rx-internal-delay-ps" and "tx-internal-delay-ps" properties to
+ * configure the rx and tx delays for the MAC. If these properties are missing
+ * or set to zero, the MAC will not apply any delay.
+ *
+ * The PHY side delays are determined by the PHY mode
+ * (e.g. PHY_INTERFACE_MODE_RGMII_{ID, RXID, TXID}), and ignored by the MAC side
+ * entirely.
+ */
+static int lan969x_rgmii_delay_config(struct sparx5_port *port,
+				      struct sparx5_port_config *conf)
+{
+	u32 tx_clk_sel, rx_clk_sel, tx_delay_ps = 0, rx_delay_ps = 0;
+	u32 idx = RGMII_PORT_IDX(port);
+	int err;
+
+	of_property_read_u32(port->of_node, "rx-internal-delay-ps",
+			     &rx_delay_ps);
+
+	of_property_read_u32(port->of_node, "tx-internal-delay-ps",
+			     &tx_delay_ps);
+
+	err = lan969x_rgmii_get_clk_delay_sel(port, rx_delay_ps, &rx_clk_sel);
+	if (err)
+		return err;
+
+	err = lan969x_rgmii_get_clk_delay_sel(port, tx_delay_ps, &tx_clk_sel);
+	if (err)
+		return err;
+
+	/* Configure rx delay. */
+	spx5_rmw(HSIO_WRAP_DLL_CFG_DLL_RST_SET(0) |
+		 HSIO_WRAP_DLL_CFG_DLL_ENA_SET(1) |
+		 HSIO_WRAP_DLL_CFG_DLL_CLK_ENA_SET(!!rx_delay_ps) |
+		 HSIO_WRAP_DLL_CFG_DLL_CLK_SEL_SET(rx_clk_sel),
+		 HSIO_WRAP_DLL_CFG_DLL_RST |
+		 HSIO_WRAP_DLL_CFG_DLL_ENA |
+		 HSIO_WRAP_DLL_CFG_DLL_CLK_ENA |
+		 HSIO_WRAP_DLL_CFG_DLL_CLK_SEL,
+		 port->sparx5, HSIO_WRAP_DLL_CFG(idx, 0));
+
+	/* Configure tx delay. */
+	spx5_rmw(HSIO_WRAP_DLL_CFG_DLL_RST_SET(0) |
+		 HSIO_WRAP_DLL_CFG_DLL_ENA_SET(1) |
+		 HSIO_WRAP_DLL_CFG_DLL_CLK_ENA_SET(!!tx_delay_ps) |
+		 HSIO_WRAP_DLL_CFG_DLL_CLK_SEL_SET(tx_clk_sel),
+		 HSIO_WRAP_DLL_CFG_DLL_RST |
+		 HSIO_WRAP_DLL_CFG_DLL_ENA |
+		 HSIO_WRAP_DLL_CFG_DLL_CLK_ENA |
+		 HSIO_WRAP_DLL_CFG_DLL_CLK_SEL,
+		 port->sparx5, HSIO_WRAP_DLL_CFG(idx, 1));
+
+	return 0;
+}
+
+/* Configure GPIO's to be used as RGMII interface. */
+static void lan969x_rgmii_gpio_config(struct sparx5_port *port)
+{
+	u32 idx = RGMII_PORT_IDX(port);
+
+	/* Enable the RGMII on the GPIOs. */
+	spx5_wr(HSIO_WRAP_XMII_CFG_GPIO_XMII_CFG_SET(1), port->sparx5,
+		HSIO_WRAP_XMII_CFG(!idx));
+}
+
+int lan969x_port_config_rgmii(struct sparx5_port *port,
+			      struct sparx5_port_config *conf)
+{
+	int err;
+
+	err = lan969x_rgmii_delay_config(port, conf);
+	if (err)
+		return err;
+
+	lan969x_rgmii_tx_clk_config(port, conf);
+	lan969x_rgmii_gpio_config(port);
+	lan969x_rgmii_port_device_config(port, conf);
+
+	return 0;
+}

drivers/net/ethernet/microchip/sparx5/sparx5_main.c

···
 			      struct initial_port_config *config)
 {
 	struct sparx5_port *spx5_port;
+	const struct sparx5_ops *ops;
 	struct net_device *ndev;
 	struct phylink *phylink;
 	int err;
+
+	ops = sparx5->data->ops;
 
 	ndev = sparx5_create_netdev(sparx5, config->portno);
 	if (IS_ERR(ndev)) {
···
 	spx5_port->phylink_config.mac_capabilities = MAC_ASYM_PAUSE |
 		MAC_SYM_PAUSE | MAC_10 | MAC_100 | MAC_1000FD |
 		MAC_2500FD | MAC_5000FD | MAC_10000FD | MAC_25000FD;
+
+	if (ops->is_port_rgmii(spx5_port->portno))
+		phy_interface_set_rgmii(spx5_port->phylink_config.supported_interfaces);
 
 	__set_bit(PHY_INTERFACE_MODE_SGMII,
 		  spx5_port->phylink_config.supported_interfaces);
···
 	struct initial_port_config *configs, *config;
 	struct device_node *np = pdev->dev.of_node;
 	struct device_node *ports, *portnp;
+	const struct sparx5_ops *ops;
 	struct reset_control *reset;
 	struct sparx5 *sparx5;
 	int idx = 0, err = 0;
···
 		return -EINVAL;
 
 	regs = sparx5->data->regs;
+	ops = sparx5->data->ops;
 
 	/* Do switch core reset if available */
 	reset = devm_reset_control_get_optional_shared(&pdev->dev, "switch");
···
 
 	for_each_available_child_of_node(ports, portnp) {
 		struct sparx5_port_config *conf;
-		struct phy *serdes;
+		struct phy *serdes = NULL;
 		u32 portno;
 
 		err = of_property_read_u32(portnp, "reg", &portno);
···
 			conf->sd_sgpio = ~0;
 		else
 			sparx5->sd_sgpio_remapping = true;
-		serdes = devm_of_phy_get(sparx5->dev, portnp, NULL);
-		if (IS_ERR(serdes)) {
-			err = dev_err_probe(sparx5->dev, PTR_ERR(serdes),
-					    "port %u: missing serdes\n",
-					    portno);
-			of_node_put(portnp);
-			goto cleanup_config;
+		/* There is no SerDes node for RGMII ports. */
+		if (!ops->is_port_rgmii(portno)) {
+			serdes = devm_of_phy_get(sparx5->dev, portnp, NULL);
+			if (IS_ERR(serdes)) {
+				err = dev_err_probe(sparx5->dev,
+						    PTR_ERR(serdes),
+						    "port %u: missing serdes\n",
+						    portno);
+				of_node_put(portnp);
+				goto cleanup_config;
+			}
 		}
 		config->portno = portno;
 		config->node = portnp;
···
 	.is_port_5g              = &sparx5_port_is_5g,
 	.is_port_10g             = &sparx5_port_is_10g,
 	.is_port_25g             = &sparx5_port_is_25g,
+	.is_port_rgmii           = &sparx5_port_is_rgmii,
 	.get_port_dev_index      = &sparx5_port_dev_mapping,
 	.get_port_dev_bit        = &sparx5_port_dev_mapping,
 	.get_hsch_max_group_rate = &sparx5_get_hsch_max_group_rate,

drivers/net/ethernet/microchip/sparx5/sparx5_main.h

···
 	bool (*is_port_5g)(int portno);
 	bool (*is_port_10g)(int portno);
 	bool (*is_port_25g)(int portno);
+	bool (*is_port_rgmii)(int portno);
 	u32  (*get_port_dev_index)(struct sparx5 *sparx5, int port);
 	u32  (*get_port_dev_bit)(struct sparx5 *sparx5, int port);
 	u32  (*get_hsch_max_group_rate)(int grp);
···
 	irqreturn_t (*ptp_irq_handler)(int irq, void *args);
 	int (*dsm_calendar_calc)(struct sparx5 *sparx5, u32 taxi,
 				 struct sparx5_calendar_data *data);
+	int (*port_config_rgmii)(struct sparx5_port *port,
+				 struct sparx5_port_config *conf);
 };
 
 struct sparx5_main_io_resource {

drivers/net/ethernet/microchip/sparx5/sparx5_main_regs.h

···
 	TARGET_FDMA = 117,
 	TARGET_GCB = 118,
 	TARGET_HSCH = 119,
+	TARGET_HSIO_WRAP = 120,
 	TARGET_LRN = 122,
 	TARGET_PCEP = 129,
 	TARGET_PCS10G_BR = 132,
···
 	TARGET_VCAP_SUPER = 326,
 	TARGET_VOP = 327,
 	TARGET_XQS = 331,
+	TARGET_DEVRGMII = 392,
 	NUM_TARGETS = 517
 };
 
···
 #define HSCH_TAS_STATEMACHINE_CFG_REVISIT_DLY_GET(x)\
 	FIELD_GET(HSCH_TAS_STATEMACHINE_CFG_REVISIT_DLY, x)
 
+/* LAN969X ONLY */
+/* HSIOWRAP:XMII_CFG:XMII_CFG */
+#define HSIO_WRAP_XMII_CFG(g)                                                  \
+	__REG(TARGET_HSIO_WRAP, 0, 1, 116, g, 2, 20, 0, 0, 1, 4)
+
+#define HSIO_WRAP_XMII_CFG_GPIO_XMII_CFG         GENMASK(2, 1)
+#define HSIO_WRAP_XMII_CFG_GPIO_XMII_CFG_SET(x)\
+	FIELD_PREP(HSIO_WRAP_XMII_CFG_GPIO_XMII_CFG, x)
+#define HSIO_WRAP_XMII_CFG_GPIO_XMII_CFG_GET(x)\
+	FIELD_GET(HSIO_WRAP_XMII_CFG_GPIO_XMII_CFG, x)
+
+/* LAN969X ONLY */
+/* HSIOWRAP:XMII_CFG:RGMII_CFG */
+#define HSIO_WRAP_RGMII_CFG(g)                                                 \
+	__REG(TARGET_HSIO_WRAP, 0, 1, 116, g, 2, 20, 4, 0, 1, 4)
+
+#define HSIO_WRAP_RGMII_CFG_TX_CLK_CFG           GENMASK(4, 2)
+#define HSIO_WRAP_RGMII_CFG_TX_CLK_CFG_SET(x)\
+	FIELD_PREP(HSIO_WRAP_RGMII_CFG_TX_CLK_CFG, x)
+#define HSIO_WRAP_RGMII_CFG_TX_CLK_CFG_GET(x)\
+	FIELD_GET(HSIO_WRAP_RGMII_CFG_TX_CLK_CFG, x)
+
+#define HSIO_WRAP_RGMII_CFG_RGMII_TX_RST         BIT(1)
+#define HSIO_WRAP_RGMII_CFG_RGMII_TX_RST_SET(x)\
+	FIELD_PREP(HSIO_WRAP_RGMII_CFG_RGMII_TX_RST, x)
+#define HSIO_WRAP_RGMII_CFG_RGMII_TX_RST_GET(x)\
+	FIELD_GET(HSIO_WRAP_RGMII_CFG_RGMII_TX_RST, x)
+
+#define HSIO_WRAP_RGMII_CFG_RGMII_RX_RST         BIT(0)
+#define HSIO_WRAP_RGMII_CFG_RGMII_RX_RST_SET(x)\
+	FIELD_PREP(HSIO_WRAP_RGMII_CFG_RGMII_RX_RST, x)
+#define HSIO_WRAP_RGMII_CFG_RGMII_RX_RST_GET(x)\
+	FIELD_GET(HSIO_WRAP_RGMII_CFG_RGMII_RX_RST, x)
+
+/* LAN969X ONLY */
+/* HSIOWRAP:XMII_CFG:DLL_CFG */
+#define HSIO_WRAP_DLL_CFG(g, r)                                                \
+	__REG(TARGET_HSIO_WRAP, 0, 1, 116, g, 2, 20, 12, r, 2, 4)
+
+#define HSIO_WRAP_DLL_CFG_DLL_ENA                BIT(19)
+#define HSIO_WRAP_DLL_CFG_DLL_ENA_SET(x)\
+	FIELD_PREP(HSIO_WRAP_DLL_CFG_DLL_ENA, x)
+#define HSIO_WRAP_DLL_CFG_DLL_ENA_GET(x)\
+	FIELD_GET(HSIO_WRAP_DLL_CFG_DLL_ENA, x)
+
+#define HSIO_WRAP_DLL_CFG_DLL_CLK_ENA            BIT(18)
+#define HSIO_WRAP_DLL_CFG_DLL_CLK_ENA_SET(x)\
+	FIELD_PREP(HSIO_WRAP_DLL_CFG_DLL_CLK_ENA, x)
+#define HSIO_WRAP_DLL_CFG_DLL_CLK_ENA_GET(x)\
+	FIELD_GET(HSIO_WRAP_DLL_CFG_DLL_CLK_ENA, x)
+
+#define HSIO_WRAP_DLL_CFG_DLL_CLK_SEL            GENMASK(17, 15)
+#define HSIO_WRAP_DLL_CFG_DLL_CLK_SEL_SET(x)\
+	FIELD_PREP(HSIO_WRAP_DLL_CFG_DLL_CLK_SEL, x)
+#define HSIO_WRAP_DLL_CFG_DLL_CLK_SEL_GET(x)\
+	FIELD_GET(HSIO_WRAP_DLL_CFG_DLL_CLK_SEL, x)
+
+#define HSIO_WRAP_DLL_CFG_DLL_RST                BIT(0)
+#define HSIO_WRAP_DLL_CFG_DLL_RST_SET(x)\
+	FIELD_PREP(HSIO_WRAP_DLL_CFG_DLL_RST, x)
+#define HSIO_WRAP_DLL_CFG_DLL_RST_GET(x)\
+	FIELD_GET(HSIO_WRAP_DLL_CFG_DLL_RST, x)
+
 /* LRN:COMMON:COMMON_ACCESS_CTRL */
 #define LRN_COMMON_ACCESS_CTRL                                                 \
 	__REG(TARGET_LRN, 0, 1, 0, 0, 1, 72, 0, 0, 1, 4)
···
 /* XQS:STAT:CNT */
 #define XQS_CNT(g)                                                             \
 	__REG(TARGET_XQS, 0, 1, 0, g, 1024, 4, 0, 0, 1, 4)
+
+/* LAN969X ONLY */
+/* DEV1G:DEV_CFG_STATUS:DEV_RST_CTRL */
+#define DEVRGMII_DEV_RST_CTRL(t)                                               \
+	__REG(TARGET_DEVRGMII, t, 2, 0, 0, 1, 36, 0, 0, 1, 4)
+
+#define DEVRGMII_DEV_RST_CTRL_SPEED_SEL          GENMASK(22, 20)
+#define DEVRGMII_DEV_RST_CTRL_SPEED_SEL_SET(x)\
+	FIELD_PREP(DEVRGMII_DEV_RST_CTRL_SPEED_SEL, x)
+#define DEVRGMII_DEV_RST_CTRL_SPEED_SEL_GET(x)\
+	FIELD_GET(DEVRGMII_DEV_RST_CTRL_SPEED_SEL, x)
+
+/* LAN969X ONLY */
+/* DEV1G:MAC_CFG_STATUS:MAC_ENA_CFG */
+#define DEVRGMII_MAC_ENA_CFG(t)                                                \
+	__REG(TARGET_DEVRGMII, t, 2, 36, 0, 1, 36, 0, 0, 1, 4)
+
+#define DEVRGMII_MAC_ENA_CFG_RX_ENA              BIT(4)
+#define DEVRGMII_MAC_ENA_CFG_RX_ENA_SET(x)\
+	FIELD_PREP(DEVRGMII_MAC_ENA_CFG_RX_ENA, x)
+#define DEVRGMII_MAC_ENA_CFG_RX_ENA_GET(x)\
+	FIELD_GET(DEVRGMII_MAC_ENA_CFG_RX_ENA, x)
+
+#define DEVRGMII_MAC_ENA_CFG_TX_ENA              BIT(0)
+#define DEVRGMII_MAC_ENA_CFG_TX_ENA_SET(x)\
+	FIELD_PREP(DEVRGMII_MAC_ENA_CFG_TX_ENA, x)
+#define DEVRGMII_MAC_ENA_CFG_TX_ENA_GET(x)\
+	FIELD_GET(DEVRGMII_MAC_ENA_CFG_TX_ENA, x)
+
+/* LAN969X ONLY */
+/* DEV1G:MAC_CFG_STATUS:MAC_TAGS_CFG */
+#define DEVRGMII_MAC_TAGS_CFG(t)                                               \
+	__REG(TARGET_DEVRGMII, t, 2, 36, 0, 1, 36, 12, 0, 1, 4)
+
+#define DEVRGMII_MAC_TAGS_CFG_TAG_ID             GENMASK(31, 16)
+#define DEVRGMII_MAC_TAGS_CFG_TAG_ID_SET(x)\
+	FIELD_PREP(DEVRGMII_MAC_TAGS_CFG_TAG_ID, x)
+#define DEVRGMII_MAC_TAGS_CFG_TAG_ID_GET(x)\
+	FIELD_GET(DEVRGMII_MAC_TAGS_CFG_TAG_ID, x)
+
+#define DEVRGMII_MAC_TAGS_CFG_VLAN_LEN_AWR_ENA   BIT(3)
+#define DEVRGMII_MAC_TAGS_CFG_VLAN_LEN_AWR_ENA_SET(x)\
+	FIELD_PREP(DEVRGMII_MAC_TAGS_CFG_VLAN_LEN_AWR_ENA, x)
+#define DEVRGMII_MAC_TAGS_CFG_VLAN_LEN_AWR_ENA_GET(x)\
+	FIELD_GET(DEVRGMII_MAC_TAGS_CFG_VLAN_LEN_AWR_ENA, x)
+
+#define DEVRGMII_MAC_TAGS_CFG_PB_ENA             GENMASK(2, 1)
+#define DEVRGMII_MAC_TAGS_CFG_PB_ENA_SET(x)\
+	FIELD_PREP(DEVRGMII_MAC_TAGS_CFG_PB_ENA, x)
+#define DEVRGMII_MAC_TAGS_CFG_PB_ENA_GET(x)\
+	FIELD_GET(DEVRGMII_MAC_TAGS_CFG_PB_ENA, x)
+
+#define DEVRGMII_MAC_TAGS_CFG_VLAN_AWR_ENA       BIT(0)
+#define DEVRGMII_MAC_TAGS_CFG_VLAN_AWR_ENA_SET(x)\
+	FIELD_PREP(DEVRGMII_MAC_TAGS_CFG_VLAN_AWR_ENA, x)
+#define DEVRGMII_MAC_TAGS_CFG_VLAN_AWR_ENA_GET(x)\
+	FIELD_GET(DEVRGMII_MAC_TAGS_CFG_VLAN_AWR_ENA, x)
+
+/* LAN969X ONLY */
+/* DEV1G:MAC_CFG_STATUS:MAC_IFG_CFG */
+#define DEVRGMII_MAC_IFG_CFG(t)                                                \
+	__REG(TARGET_DEVRGMII, t, 2, 36, 0, 1, 36, 24, 0, 1, 4)
+
+#define DEVRGMII_MAC_IFG_CFG_TX_IFG              GENMASK(12, 8)
+#define DEVRGMII_MAC_IFG_CFG_TX_IFG_SET(x)\
+	FIELD_PREP(DEVRGMII_MAC_IFG_CFG_TX_IFG, x)
+#define DEVRGMII_MAC_IFG_CFG_TX_IFG_GET(x)\
+	FIELD_GET(DEVRGMII_MAC_IFG_CFG_TX_IFG, x)
+
+#define DEVRGMII_MAC_IFG_CFG_RX_IFG2             GENMASK(7, 4)
+#define DEVRGMII_MAC_IFG_CFG_RX_IFG2_SET(x)\
+	FIELD_PREP(DEVRGMII_MAC_IFG_CFG_RX_IFG2, x)
+#define DEVRGMII_MAC_IFG_CFG_RX_IFG2_GET(x)\
+	FIELD_GET(DEVRGMII_MAC_IFG_CFG_RX_IFG2, x)
+
+#define DEVRGMII_MAC_IFG_CFG_RX_IFG1             GENMASK(3, 0)
+#define DEVRGMII_MAC_IFG_CFG_RX_IFG1_SET(x)\
+	FIELD_PREP(DEVRGMII_MAC_IFG_CFG_RX_IFG1, x)
+#define DEVRGMII_MAC_IFG_CFG_RX_IFG1_GET(x)\
+	FIELD_GET(DEVRGMII_MAC_IFG_CFG_RX_IFG1, x)
 
 #endif /* _SPARX5_MAIN_REGS_H_ */

drivers/net/ethernet/microchip/sparx5/sparx5_phylink.c

···
 {
 	struct sparx5_port *port = netdev_priv(to_net_dev(config->dev));
 
-	return &port->phylink_pcs;
+	/* Return the PCS for all the modes that require it. */
+	switch (interface) {
+	case PHY_INTERFACE_MODE_SGMII:
+	case PHY_INTERFACE_MODE_QSGMII:
+	case PHY_INTERFACE_MODE_1000BASEX:
+	case PHY_INTERFACE_MODE_2500BASEX:
+	case PHY_INTERFACE_MODE_5GBASER:
+	case PHY_INTERFACE_MODE_10GBASER:
+	case PHY_INTERFACE_MODE_25GBASER:
+		return &port->phylink_pcs;
+	default:
+		return NULL;
+	}
 }
 
 static void sparx5_phylink_mac_config(struct phylink_config *config,

drivers/net/ethernet/microchip/sparx5/sparx5_port.c

···
 		     conf->speed != SPEED_25000))
 			return sparx5_port_error(port, conf, SPX5_PERR_SPEED);
 		break;
+	case PHY_INTERFACE_MODE_RGMII:
+	case PHY_INTERFACE_MODE_RGMII_ID:
+	case PHY_INTERFACE_MODE_RGMII_TXID:
+	case PHY_INTERFACE_MODE_RGMII_RXID:
+		if (conf->speed != SPEED_1000 &&
+		    conf->speed != SPEED_100 &&
+		    conf->speed != SPEED_10)
+			return sparx5_port_error(port, conf, SPX5_PERR_SPEED);
+		break;
 	default:
 		return sparx5_port_error(port, conf, SPX5_PERR_IFTYPE);
 	}
···
 		       struct sparx5_port *port,
 		       struct sparx5_port_config *conf)
 {
+	bool rgmii = phy_interface_mode_is_rgmii(conf->phy_mode);
 	bool high_speed_dev = sparx5_is_baser(conf->portmode);
 	const struct sparx5_ops *ops = sparx5->data->ops;
 	int err, urgency, stop_wm;
···
 	if (err)
 		return err;
 
+	if (rgmii) {
+		err = ops->port_config_rgmii(port, conf);
+		if (err)
+			return err;
+	}
+
 	/* high speed device is already configured */
-	if (!high_speed_dev)
+	if (!rgmii && !high_speed_dev)
 		sparx5_port_config_low_set(sparx5, port, conf);
 
 	/* Configure flow control */
···
 	if (err)
 		return err;
 
-	/* Configure MAC vlan awareness */
-	err = sparx5_port_max_tags_set(sparx5, port);
-	if (err)
-		return err;
-
-	/* Set Max Length */
-	spx5_rmw(DEV2G5_MAC_MAXLEN_CFG_MAX_LEN_SET(ETH_MAXLEN),
-		 DEV2G5_MAC_MAXLEN_CFG_MAX_LEN,
-		 sparx5,
-		 DEV2G5_MAC_MAXLEN_CFG(port->portno));
-
-	/* 1G/2G5: Signal Detect configuration */
-	spx5_wr(DEV2G5_PCS1G_SD_CFG_SD_POL_SET(sd_pol) |
-		DEV2G5_PCS1G_SD_CFG_SD_SEL_SET(sd_sel) |
-		DEV2G5_PCS1G_SD_CFG_SD_ENA_SET(sd_ena),
-		sparx5,
-		DEV2G5_PCS1G_SD_CFG(port->portno));
-
 	/* Set Pause WM hysteresis */
 	spx5_rmw(QSYS_PAUSE_CFG_PAUSE_START_SET(pause_start) |
 		 QSYS_PAUSE_CFG_PAUSE_STOP_SET(pause_stop) |
···
 	spx5_rmw(ANA_CL_FILTER_CTRL_FILTER_SMAC_MC_DIS_SET(0),
 		 ANA_CL_FILTER_CTRL_FILTER_SMAC_MC_DIS,
 		 sparx5, ANA_CL_FILTER_CTRL(port->portno));
+
+	if (ops->is_port_rgmii(port->portno))
+		return 0; /* RGMII device - nothing more to configure */
+
+	/* Configure MAC vlan awareness */
+	err = sparx5_port_max_tags_set(sparx5, port);
+	if (err)
+		return err;
+
+	/* Set Max Length */
+	spx5_rmw(DEV2G5_MAC_MAXLEN_CFG_MAX_LEN_SET(ETH_MAXLEN),
+		 DEV2G5_MAC_MAXLEN_CFG_MAX_LEN,
+		 sparx5,
+		 DEV2G5_MAC_MAXLEN_CFG(port->portno));
+
+	/* 1G/2G5: Signal Detect configuration */
+	spx5_wr(DEV2G5_PCS1G_SD_CFG_SD_POL_SET(sd_pol) |
+		DEV2G5_PCS1G_SD_CFG_SD_SEL_SET(sd_sel) |
+		DEV2G5_PCS1G_SD_CFG_SD_ENA_SET(sd_ena),
+		sparx5,
+		DEV2G5_PCS1G_SD_CFG(port->portno));
 
 	if (conf->portmode == PHY_INTERFACE_MODE_QSGMII ||
 	    conf->portmode == PHY_INTERFACE_MODE_SGMII) {

drivers/net/ethernet/microchip/sparx5/sparx5_port.h

···
 	return portno >= 56 && portno <= 63;
 }
 
+static inline bool sparx5_port_is_rgmii(int portno)
+{
+	return false;
+}
+
 static inline u32 sparx5_to_high_dev(struct sparx5 *sparx5, int port)
 {
 	const struct sparx5_ops *ops = sparx5->data->ops;