[PATCH net-next v5 0/4] Add AST2600 RGMII delay into ftgmac100

[PATCH net-next v5 0/4] Add AST2600 RGMII delay into ftgmac100

[Jacky Chou]

This patch series adds support for configuring RGMII internal delays for the
Aspeed AST2600 FTGMAC100 Ethernet MACs. It introduces new compatible strings to
distinguish between MAC0/1 and MAC2/3, as their delay chains and configuration
units differ.
The device tree bindings are updated to restrict the allowed phy-mode and delay
properties for each MAC type. Corresponding changes are made to the device tree
source files and the FTGMAC100 driver to support the new delay configuration.

This enables precise RGMII timing configuration for AST2600-based platforms,
improving interoperability with various PHYs

Signed-off-by: Jacky Chou <jacky_chou@aspeedtech.com>
---
Changes in v5:
- Remove the new property, "aspeed,rgmii-delay-ps" from yaml and driver
- Add aspeed,scu to aspeed-g6 dtsi back
- Determine delay value from bootloader and tx/rx-internal-delay-ps to
  configure RGMII delay value with phy-mode
- Add a helper for AST2600 to get phy driver handle
- Link to v4: https://lore.kernel.org/r/20251110-rgmii_delay_2600-v4-0-5cad32c766f7@aspeedtech.com

Changes in v4:
- Remove the compatible "aspeed,ast2600-mac01" and
  "aspeed,ast2600-mac23"
- Add new property to specify the RGMII delay step for each MACs
- Add default value of rx/tx-internal-delay-ps
- For legacy dts, a warning message reminds users to update phy-mode
- If lack rx/tx-internal-delay-ps, driver will use default value to
  configure the RGMII delay
- Link to v3: https://lore.kernel.org/r/20251103-rgmii_delay_2600-v3-0-e2af2656f7d7@aspeedtech.com

Changes in v3:
- Add new item on compatible property for new compatible strings
- Remove the new compatible and scu handle of MAC from aspeed-g6.dtsi
- Add new compatible and scu handle to MAC node in
  aspeed-ast2600-evb.dts
- Change all phy-mode of MACs to "rgmii-id"
- Keep "aspeed,ast2600-mac" compatible in ftgmac100.c and configure the
  rgmii delay with "aspeed,ast2600-mac01" and "aspeed,ast2600-mac23"
- Link to v2: https://lore.kernel.org/r/20250813063301.338851-1-jacky_chou@aspeedtech.com

Changes in v2:
- added new compatible strings for MAC0/1 and MAC2/3
- updated device tree bindings to restrict phy-mode and delay properties
- refactored driver code to handle rgmii delay configuration
- Link to v1: https://lore.kernel.org/r/20250317025922.1526937-1-jacky_chou@aspeedtech.com

---
Jacky Chou (4):
      dt-bindings: net: ftgmac100: Add delay properties for AST2600
      ARM: dts: aspeed-g6: add aspeed,scu property for MAC
      net: ftgmac100: Add RGMII delay support for AST2600
      ARM: dts: aspeed: ast2600-evb: Configure RGMII delay for MAC

 .../devicetree/bindings/net/faraday,ftgmac100.yaml |  27 ++
 arch/arm/boot/dts/aspeed/aspeed-ast2600-evb.dts    |  20 +-
 arch/arm/boot/dts/aspeed/aspeed-g6.dtsi            |   4 +
 drivers/net/ethernet/faraday/ftgmac100.c           | 288 ++++++++++++++++++++-
 drivers/net/ethernet/faraday/ftgmac100.h           |  25 ++
 5 files changed, 358 insertions(+), 6 deletions(-)
---
base-commit: 8f7aa3d3c7323f4ca2768a9e74ebbe359c4f8f88
change-id: 20251031-rgmii_delay_2600-a00b0248c7e6

Best regards,
-- 
Jacky Chou <jacky_chou@aspeedtech.com>

[PATCH net-next v5 1/4] dt-bindings: net: ftgmac100: Add delay properties for AST2600

[Jacky Chou]

The AST2600 contains two dies, each with its own MAC, and these MACs
require different delay configurations.
Previously, these delay values were configured during the bootloader
stage rather than in the driver. This change introduces the use of the
standard properties defined in ethernet-controller.yaml to configure
the delay values directly in the driver.

Each Aspeed platform has its own delay step value. And for Aspeed platform,
the total steps of RGMII delay configuraion is 32 steps, so the total delay
is delay-step-ps * 32.
Default delay values are declared so that tx-internal-delay-ps and
rx-internal-delay-ps become optional. If these properties are not present,
the driver will use the default values instead.
Add conditional schema constraints for Aspeed AST2600 MAC controllers:
- For MAC0/1, per delay step for rgmii is 45 ps
- For MAC2/3, per delay step for rgmii is 250 ps
- Both require the "aspeed,scu" and "aspeed,rgmii-delay-ps" properties.
Other compatible values remain unrestricted.

Signed-off-by: Jacky Chou <jacky_chou@aspeedtech.com>
---
 .../devicetree/bindings/net/faraday,ftgmac100.yaml | 27 ++++++++++++++++++++++
 1 file changed, 27 insertions(+)

diff --git a/Documentation/devicetree/bindings/net/faraday,ftgmac100.yaml b/Documentation/devicetree/bindings/net/faraday,ftgmac100.yaml
index d14410018bcf..00f7a0e56106 100644
--- a/Documentation/devicetree/bindings/net/faraday,ftgmac100.yaml
+++ b/Documentation/devicetree/bindings/net/faraday,ftgmac100.yaml
@@ -69,6 +69,30 @@ properties:
   mdio:
     $ref: /schemas/net/mdio.yaml#
 
+  aspeed,scu:
+    $ref: /schemas/types.yaml#/definitions/phandle
+    description:
+      Phandle to the SCU (System Control Unit) syscon node for Aspeed platform.
+      This reference is used by the MAC controller to configure the RGMII delays.
+
+  rx-internal-delay-ps:
+    description:
+      RGMII Receive Clock Delay defined in pico seconds. There are 32
+      steps of RGMII delay for Aspeed platform. Each Aspeed platform has its
+      own delay step value, it is fixed by hardware design. Total delay is
+      calculated by delay-step * 32. A value of 0 ps will disable any
+      delay. The Default is no delay.
+    default: 0
+
+  tx-internal-delay-ps:
+    description:
+      RGMII Transmit Clock Delay defined in pico seconds. There are 32
+      steps of RGMII delay for Aspeed platform. Each Aspeed platform has its
+      own delay step value, it is fixed by hardware design. Total delay is
+      calculated by delay-step * 32. A value of 0 ps will disable any
+      delay. The Default is no delay.
+    default: 0
+
 required:
   - compatible
   - reg
@@ -85,6 +109,9 @@ allOf:
     then:
       properties:
         resets: true
+        aspeed,scu: true
+        rx-internal-delay-ps: true
+        tx-internal-delay-ps: true
     else:
       properties:
         resets: false

-- 
2.34.1

Re: [PATCH net-next v5 1/4] dt-bindings: net: ftgmac100: Add delay properties for AST2600

[Rob Herring]

On Fri, Dec 05, 2025 at 05:53:15PM +0800, Jacky Chou wrote:
> The AST2600 contains two dies, each with its own MAC, and these MACs
> require different delay configurations.
> Previously, these delay values were configured during the bootloader
> stage rather than in the driver. This change introduces the use of the
> standard properties defined in ethernet-controller.yaml to configure
> the delay values directly in the driver.
> 
> Each Aspeed platform has its own delay step value. And for Aspeed platform,
> the total steps of RGMII delay configuraion is 32 steps, so the total delay
> is delay-step-ps * 32.
> Default delay values are declared so that tx-internal-delay-ps and
> rx-internal-delay-ps become optional. If these properties are not present,
> the driver will use the default values instead.
> Add conditional schema constraints for Aspeed AST2600 MAC controllers:
> - For MAC0/1, per delay step for rgmii is 45 ps
> - For MAC2/3, per delay step for rgmii is 250 ps
> - Both require the "aspeed,scu" and "aspeed,rgmii-delay-ps" properties.
> Other compatible values remain unrestricted.
> 
> Signed-off-by: Jacky Chou <jacky_chou@aspeedtech.com>
> ---
>  .../devicetree/bindings/net/faraday,ftgmac100.yaml | 27 ++++++++++++++++++++++
>  1 file changed, 27 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/net/faraday,ftgmac100.yaml b/Documentation/devicetree/bindings/net/faraday,ftgmac100.yaml
> index d14410018bcf..00f7a0e56106 100644
> --- a/Documentation/devicetree/bindings/net/faraday,ftgmac100.yaml
> +++ b/Documentation/devicetree/bindings/net/faraday,ftgmac100.yaml
> @@ -69,6 +69,30 @@ properties:
>    mdio:
>      $ref: /schemas/net/mdio.yaml#
>  
> +  aspeed,scu:
> +    $ref: /schemas/types.yaml#/definitions/phandle
> +    description:
> +      Phandle to the SCU (System Control Unit) syscon node for Aspeed platform.
> +      This reference is used by the MAC controller to configure the RGMII delays.
> +
> +  rx-internal-delay-ps:
> +    description:
> +      RGMII Receive Clock Delay defined in pico seconds. There are 32
> +      steps of RGMII delay for Aspeed platform. Each Aspeed platform has its
> +      own delay step value, it is fixed by hardware design. Total delay is
> +      calculated by delay-step * 32. A value of 0 ps will disable any
> +      delay. The Default is no delay.
> +    default: 0
> +
> +  tx-internal-delay-ps:
> +    description:
> +      RGMII Transmit Clock Delay defined in pico seconds. There are 32
> +      steps of RGMII delay for Aspeed platform. Each Aspeed platform has its
> +      own delay step value, it is fixed by hardware design. Total delay is
> +      calculated by delay-step * 32. A value of 0 ps will disable any
> +      delay. The Default is no delay.
> +    default: 0
> +
>  required:
>    - compatible
>    - reg
> @@ -85,6 +109,9 @@ allOf:
>      then:
>        properties:
>          resets: true
> +        aspeed,scu: true
> +        rx-internal-delay-ps: true
> +        tx-internal-delay-ps: true

There is no need for these (including the 'resets'). Really, the 'if' 
should be negated with a 'not' and this part dropped.

>      else:
>        properties:
>          resets: false

But you need false entries here since these 3 properties are just for 
ast2600.

Rob

[PATCH net-next v5 2/4] ARM: dts: aspeed-g6: add aspeed,scu property for MAC

[Jacky Chou]

Add aspeed,scu property to let MAC driver to configure RGMII delay with
scu register.

Signed-off-by: Jacky Chou <jacky_chou@aspeedtech.com>
---
 arch/arm/boot/dts/aspeed/aspeed-g6.dtsi | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/arch/arm/boot/dts/aspeed/aspeed-g6.dtsi b/arch/arm/boot/dts/aspeed/aspeed-g6.dtsi
index f8662c8ac089..d85b3be63107 100644
--- a/arch/arm/boot/dts/aspeed/aspeed-g6.dtsi
+++ b/arch/arm/boot/dts/aspeed/aspeed-g6.dtsi
@@ -236,6 +236,7 @@ mac0: ethernet@1e660000 {
 			reg = <0x1e660000 0x180>;
 			interrupts = <GIC_SPI 2 IRQ_TYPE_LEVEL_HIGH>;
 			clocks = <&syscon ASPEED_CLK_GATE_MAC1CLK>;
+			aspeed,scu = <&syscon>;
 			status = "disabled";
 		};
 
@@ -244,6 +245,7 @@ mac1: ethernet@1e680000 {
 			reg = <0x1e680000 0x180>;
 			interrupts = <GIC_SPI 3 IRQ_TYPE_LEVEL_HIGH>;
 			clocks = <&syscon ASPEED_CLK_GATE_MAC2CLK>;
+			aspeed,scu = <&syscon>;
 			status = "disabled";
 		};
 
@@ -252,6 +254,7 @@ mac2: ethernet@1e670000 {
 			reg = <0x1e670000 0x180>;
 			interrupts = <GIC_SPI 32 IRQ_TYPE_LEVEL_HIGH>;
 			clocks = <&syscon ASPEED_CLK_GATE_MAC3CLK>;
+			aspeed,scu = <&syscon>;
 			status = "disabled";
 		};
 
@@ -260,6 +263,7 @@ mac3: ethernet@1e690000 {
 			reg = <0x1e690000 0x180>;
 			interrupts = <GIC_SPI 33 IRQ_TYPE_LEVEL_HIGH>;
 			clocks = <&syscon ASPEED_CLK_GATE_MAC4CLK>;
+			aspeed,scu = <&syscon>;
 			status = "disabled";
 		};
 

-- 
2.34.1

[PATCH net-next v5 3/4] net: ftgmac100: Add RGMII delay support for AST2600

[Jacky Chou]

On the AST2600 platform, the RGMII delay is controlled via the
SCU registers. The delay chain configuration differs between MAC0/1
and MAC2/3, even though all four MACs use a 32-stage delay chain.
+------+----------+-----------+-------------+-------------+
|      |Delay Unit|Delay Stage|TX Edge Stage|RX Edge Stage|
+------+----------+-----------+-------------+-------------+
|MAC0/1|     45 ps|        32 |           0 |           0 |
+------+----------+-----------+-------------+-------------+
|MAC2/3|    250 ps|        32 |           0 |          26 |
+------+----------+-----------+-------------+-------------+
For MAC2/3, the "no delay" condition starts from stage 26.
Setting the RX delay stage to 26 means that no additional RX
delay is applied.
Here lists the RX delay setting of MAC2/3 below.
26 -> 0   ns, 27 -> 0.25 ns, ... , 31 -> 1.25 ns,
0  -> 1.5 ns, 1  -> 1.75 ns, ... , 25 -> 7.75 ns

Therefore, we calculate the delay stage from the
rx-internal-delay-ps of MAC2/3 to add 26. If the stage is equel
to or bigger than 32, the delay stage will be mask 0x1f to get
the correct setting.
The delay chain is like a ring for configuration.
Example for the rx-internal-delay-ps of MAC2/3 is 2000 ps,
we will get the delay stage is 2.

Strating to this patch, driver will remind the legacy dts to update the
"phy-mode" to "rgmii-id, and if necessary, add small
"rx-internal-delay-ps" and "tx-internal-delay-ps.
If lack the two properties, driver will accord to the original delay
value from bootloader to disable RGMII delay and to change the phy
interface to phy driver.

Signed-off-by: Jacky Chou <jacky_chou@aspeedtech.com>
---
 drivers/net/ethernet/faraday/ftgmac100.c | 288 ++++++++++++++++++++++++++++++-
 drivers/net/ethernet/faraday/ftgmac100.h |  25 +++
 2 files changed, 311 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/faraday/ftgmac100.c b/drivers/net/ethernet/faraday/ftgmac100.c
index a863f7841210..bf92dc0b7260 100644
--- a/drivers/net/ethernet/faraday/ftgmac100.c
+++ b/drivers/net/ethernet/faraday/ftgmac100.c
@@ -26,6 +26,9 @@
 #include <linux/if_vlan.h>
 #include <linux/of_net.h>
 #include <linux/phy_fixed.h>
+#include <linux/mfd/syscon.h>
+#include <linux/regmap.h>
+#include <linux/bitfield.h>
 #include <net/ip.h>
 #include <net/ncsi.h>
 
@@ -1833,12 +1836,281 @@ static bool ftgmac100_has_child_node(struct device_node *np, const char *name)
 	return ret;
 }
 
+static int ftgmac100_get_ast2600_rgmii_flag(u32 delay)
+{
+	if ((delay > 500 && delay < 1500) ||
+	    (delay > 2500 && delay < 7500))
+		return AST2600_RGMII_KEEP_DELAY;
+
+	return AST2600_RGMII_DIS_DELAY;
+}
+
+static int ftgmac100_check_ast2600_rgmii_delay(struct regmap *scu,
+					       u32 delay_unit,
+					       int mac_id, int dly_reg)
+{
+	u32 delay_value;
+	u32 tx_delay;
+	u32 rx_delay;
+	int tx_flag;
+	int rx_flag;
+
+	regmap_read(scu, dly_reg, &delay_value);
+	if (mac_id == 0 || mac_id == 2) {
+		tx_delay = FIELD_GET(ASPEED_MAC0_2_TX_DLY, delay_value);
+		rx_delay = FIELD_GET(ASPEED_MAC0_2_RX_DLY, delay_value);
+	} else {
+		tx_delay = FIELD_GET(ASPEED_MAC1_3_TX_DLY, delay_value);
+		rx_delay = FIELD_GET(ASPEED_MAC1_3_RX_DLY, delay_value);
+	}
+
+	/* Due to the hardware design reason, for MAC2/3 on AST2600,
+	 * the zero delay ns on RX is configured by setting value 0x1a.
+	 * List as below:
+	 * 0x1a, 0x1b, ... , 0x1f, 0x00, 0x01, ... , 0x19
+	 * Covert for calculation purpose.
+	 * 0x00, 0x01, ... , 0x19, 0x1a, 0x1b, ... , 0x1f
+	 */
+	if (mac_id == 2 || mac_id == 3)
+		rx_delay = (rx_delay + 0x06) & 0x1f;
+
+	tx_delay *= delay_unit;
+	rx_delay *= delay_unit;
+
+	tx_flag = ftgmac100_get_ast2600_rgmii_flag(tx_delay);
+	rx_flag = ftgmac100_get_ast2600_rgmii_flag(rx_delay);
+
+	if (tx_flag == AST2600_RGMII_KEEP_DELAY ||
+	    rx_flag == AST2600_RGMII_KEEP_DELAY) {
+		return AST2600_RGMII_KEEP_DELAY;
+	}
+
+	return AST2600_RGMII_DIS_DELAY;
+}
+
+static int ftgmac100_set_ast2600_rgmii_delay(struct ftgmac100 *priv,
+					     s32 rgmii_tx_delay,
+					     s32 rgmii_rx_delay,
+					     phy_interface_t *phy_intf)
+{
+	struct device *dev = priv->dev;
+	struct device_node *np;
+	u32 rgmii_delay_unit;
+	u32 rx_delay_index;
+	u32 tx_delay_index;
+	struct regmap *scu;
+	int dly_mask;
+	int dly_reg;
+	int mac_id;
+
+	np = dev->of_node;
+
+	scu = syscon_regmap_lookup_by_phandle(np, "aspeed,scu");
+	if (IS_ERR(scu)) {
+		dev_err(dev, "failed to get aspeed,scu");
+		return PTR_ERR(scu);
+	}
+
+	/* According to the register base address to specify the corresponding
+	 * values.
+	 */
+	switch (priv->res->start) {
+	case AST2600_MAC0_BASE_ADDR:
+		mac_id = 0;
+		rgmii_delay_unit = AST2600_MAC01_CLK_DLY_UNIT;
+		dly_reg = AST2600_MAC01_CLK_DLY;
+		break;
+	case AST2600_MAC1_BASE_ADDR:
+		mac_id = 1;
+		rgmii_delay_unit = AST2600_MAC01_CLK_DLY_UNIT;
+		dly_reg = AST2600_MAC01_CLK_DLY;
+		break;
+	case AST2600_MAC2_BASE_ADDR:
+		mac_id = 2;
+		rgmii_delay_unit = AST2600_MAC23_CLK_DLY_UNIT;
+		dly_reg = AST2600_MAC23_CLK_DLY;
+		break;
+	case AST2600_MAC3_BASE_ADDR:
+		mac_id = 3;
+		rgmii_delay_unit = AST2600_MAC23_CLK_DLY_UNIT;
+		dly_reg = AST2600_MAC23_CLK_DLY;
+		break;
+	default:
+		dev_err(dev, "Invalid mac base address");
+		return -EINVAL;
+	}
+
+	if (of_phy_is_fixed_link(np)) {
+		if (rgmii_tx_delay < 0 || rgmii_rx_delay < 0) {
+			dev_err(dev,
+				"Add rx/tx-internal-delay-ps for fixed-link\n");
+			/* Keep original RGMII delay value*/
+			return 0;
+		}
+
+		/* Must have both of rx/tx-internal-delay-ps for fixed-link */
+		goto conf_delay;
+	}
+
+	if (*phy_intf == PHY_INTERFACE_MODE_RGMII_RXID ||
+	    *phy_intf == PHY_INTERFACE_MODE_RGMII_TXID)
+		goto out_warn;
+
+	if (*phy_intf != PHY_INTERFACE_MODE_RGMII &&
+	    *phy_intf != PHY_INTERFACE_MODE_RGMII_ID)
+		return 0;
+
+	/* Both rx/tx-internal-delay-ps are not existed. */
+	if (rgmii_tx_delay < 0 && rgmii_rx_delay < 0) {
+		int flag;
+
+		flag = ftgmac100_check_ast2600_rgmii_delay(scu,
+							   rgmii_delay_unit,
+							   mac_id,
+							   dly_reg);
+		if (flag == AST2600_RGMII_KEEP_DELAY)
+			goto out_warn;
+
+		if (*phy_intf == PHY_INTERFACE_MODE_RGMII) {
+			dev_err(dev, "Update phy-mode to 'rgmii-id'\n");
+			/* Forced phy interface to RGMII_ID and MAC will disable
+			 * RGMII delay.
+			 */
+			*phy_intf = PHY_INTERFACE_MODE_RGMII_ID;
+		}
+	} else {
+		/* Please refer to ethernet-controller.yaml. */
+		if (*phy_intf == PHY_INTERFACE_MODE_RGMII &&
+		    (rgmii_tx_delay == 2000 || rgmii_rx_delay == 2000)) {
+			dev_warn(dev,
+				 "RX/TX delay cannot set to 2000 on 'rgmii'\n");
+			return -EINVAL;
+		}
+	}
+
+	/* The value is negative, which means the rx/tx-internal-delay-ps
+	 * property is not existed in dts. Therefore, set to default 0.
+	 */
+	if (rgmii_tx_delay < 0)
+		rgmii_tx_delay = 0;
+	if (rgmii_rx_delay < 0)
+		rgmii_rx_delay = 0;
+
+conf_delay:
+	tx_delay_index = DIV_ROUND_CLOSEST(rgmii_tx_delay, rgmii_delay_unit);
+	if (tx_delay_index >= 32) {
+		dev_err(dev, "The %u ps of TX delay is out of range\n",
+			rgmii_tx_delay);
+		return -EINVAL;
+	}
+
+	rx_delay_index = DIV_ROUND_CLOSEST(rgmii_rx_delay, rgmii_delay_unit);
+	if (rx_delay_index >= 32) {
+		dev_err(dev, "The %u ps of RX delay is out of range\n",
+			rgmii_rx_delay);
+		return -EINVAL;
+	}
+
+	/* Due to the hardware design reason, for MAC2/3 on AST2600, the zero
+	 * delay ns on RX is configured by setting value 0x1a.
+	 * List as below:
+	 * 0x1a -> 0   ns, 0x1b -> 0.25 ns, ... , 0x1f -> 1.25 ns,
+	 * 0x00 -> 1.5 ns, 0x01 -> 1.75 ns, ... , 0x19 -> 7.75 ns, 0x1a -> 0 ns
+	 */
+	if (mac_id == 2 || mac_id == 3)
+		rx_delay_index = (AST2600_MAC23_RX_DLY_0_NS + rx_delay_index) &
+				 AST2600_MAC_TX_RX_DLY_MASK;
+
+	if (mac_id == 0 || mac_id == 2) {
+		dly_mask = ASPEED_MAC0_2_TX_DLY | ASPEED_MAC0_2_RX_DLY;
+		tx_delay_index = FIELD_PREP(ASPEED_MAC0_2_TX_DLY, tx_delay_index);
+		rx_delay_index = FIELD_PREP(ASPEED_MAC0_2_RX_DLY, rx_delay_index);
+	} else {
+		dly_mask = ASPEED_MAC1_3_TX_DLY | ASPEED_MAC1_3_RX_DLY;
+		tx_delay_index = FIELD_PREP(ASPEED_MAC1_3_TX_DLY, tx_delay_index);
+		rx_delay_index = FIELD_PREP(ASPEED_MAC1_3_RX_DLY, rx_delay_index);
+	}
+
+	regmap_update_bits(scu, dly_reg, dly_mask, tx_delay_index | rx_delay_index);
+
+	return 0;
+
+out_warn:
+	/* Print the warning message. Keep the phy-mode and the RGMII delay value. */
+	dev_warn(dev, "Update phy-mode to 'rgmii-id' and add rx/tx-internal-delay-ps\n");
+
+	return 0;
+}
+
+static int ftgmac100_set_internal_delay(struct ftgmac100 *priv,
+					phy_interface_t *phy_intf)
+{
+	struct device_node *np = priv->dev->of_node;
+	s32 rgmii_tx_delay;
+	s32 rgmii_rx_delay;
+	int err;
+
+	err = of_get_phy_mode(np, phy_intf);
+	if (err) {
+		dev_err(priv->dev, "Failed to get phy mode: %d\n", err);
+		return err;
+	}
+
+	if (!(of_device_is_compatible(np, "aspeed,ast2600-mac")))
+		return 0;
+
+	/* AST2600 needs to know if the "tx/rx-internal-delay-ps" properties
+	 * are existed in dts. If not existed, set -1 and delay is equal to 0.
+	 */
+	if (of_property_read_u32(np, "tx-internal-delay-ps", &rgmii_tx_delay))
+		rgmii_tx_delay = -1;
+	if (of_property_read_u32(np, "rx-internal-delay-ps", &rgmii_rx_delay))
+		rgmii_rx_delay = -1;
+
+	err = ftgmac100_set_ast2600_rgmii_delay(priv,
+						rgmii_tx_delay,
+						rgmii_rx_delay,
+						phy_intf);
+
+	return err;
+}
+
+static struct phy_device *ftgmac100_ast2600_phy_get(struct net_device *dev,
+						    struct device_node *np,
+						    void (*hndlr)(struct net_device *),
+						    phy_interface_t phy_intf)
+{
+	struct device_node *phy_np;
+	struct phy_device *phy;
+	int ret;
+
+	if (of_phy_is_fixed_link(np)) {
+		ret = of_phy_register_fixed_link(np);
+		if (ret < 0) {
+			netdev_err(dev, "broken fixed-link specification\n");
+			return NULL;
+		}
+		phy_np = of_node_get(np);
+	} else {
+		phy_np = of_parse_phandle(np, "phy-handle", 0);
+		if (!phy_np)
+			return NULL;
+	}
+
+	phy = of_phy_connect(dev, phy_np, hndlr, 0, phy_intf);
+
+	of_node_put(phy_np);
+
+	return phy;
+}
+
 static int ftgmac100_probe(struct platform_device *pdev)
 {
 	struct resource *res;
 	int irq;
 	struct net_device *netdev;
 	struct phy_device *phydev;
+	phy_interface_t phy_intf;
 	struct ftgmac100 *priv;
 	struct device_node *np;
 	int err = 0;
@@ -1907,6 +2179,10 @@ static int ftgmac100_probe(struct platform_device *pdev)
 		priv->rxdes0_edorr_mask = BIT(30);
 		priv->txdes0_edotr_mask = BIT(30);
 		priv->is_aspeed = true;
+		/* Configure RGMII delay if there are the corresponding compatibles */
+		err = ftgmac100_set_internal_delay(priv, &phy_intf);
+		if (err)
+			goto err_phy_connect;
 	} else {
 		priv->rxdes0_edorr_mask = BIT(15);
 		priv->txdes0_edotr_mask = BIT(15);
@@ -1955,8 +2231,16 @@ static int ftgmac100_probe(struct platform_device *pdev)
 				goto err_setup_mdio;
 		}
 
-		phy = of_phy_get_and_connect(priv->netdev, np,
-					     &ftgmac100_adjust_link);
+		/* Because AST2600 will use the RGMII delay to determine
+		 * which phy interface to use.
+		 */
+		if (of_device_is_compatible(np, "aspeed,ast2600-mac"))
+			phy = ftgmac100_ast2600_phy_get(priv->netdev, np,
+							&ftgmac100_adjust_link,
+							phy_intf);
+		else
+			phy = of_phy_get_and_connect(priv->netdev, np,
+						     &ftgmac100_adjust_link);
 		if (!phy) {
 			dev_err(&pdev->dev, "Failed to connect to phy\n");
 			err = -EINVAL;
diff --git a/drivers/net/ethernet/faraday/ftgmac100.h b/drivers/net/ethernet/faraday/ftgmac100.h
index 4968f6f0bdbc..1b2f79a104ea 100644
--- a/drivers/net/ethernet/faraday/ftgmac100.h
+++ b/drivers/net/ethernet/faraday/ftgmac100.h
@@ -271,4 +271,29 @@ struct ftgmac100_rxdes {
 #define FTGMAC100_RXDES1_UDP_CHKSUM_ERR	(1 << 26)
 #define FTGMAC100_RXDES1_IP_CHKSUM_ERR	(1 << 27)
 
+/* Aspeed SCU */
+#define AST2600_MAC01_CLK_DLY	0x340
+#define AST2600_MAC23_CLK_DLY	0x350
+#define AST2600_MAC01_CLK_DLY_UNIT	45	/* ps */
+#define AST2600_MAC01_TX_DLY_0_NS	0
+#define AST2600_MAC01_RX_DLY_0_NS	0
+#define AST2600_MAC23_CLK_DLY_UNIT	250	/* ps */
+#define AST2600_MAC23_TX_DLY_0_NS	0
+#define AST2600_MAC23_RX_DLY_0_NS	0x1a
+#define AST2600_MAC_TX_RX_DLY_MASK	0x1f
+#define ASPEED_MAC0_2_TX_DLY		GENMASK(5, 0)
+#define ASPEED_MAC0_2_RX_DLY		GENMASK(17, 12)
+#define ASPEED_MAC1_3_TX_DLY		GENMASK(11, 6)
+#define ASPEED_MAC1_3_RX_DLY		GENMASK(23, 18)
+
+#define AST2600_MAC0_BASE_ADDR		0x1e660000
+#define AST2600_MAC1_BASE_ADDR		0x1e680000
+#define AST2600_MAC2_BASE_ADDR		0x1e670000
+#define AST2600_MAC3_BASE_ADDR		0x1e690000
+
+/* Keep original delay */
+#define AST2600_RGMII_KEEP_DELAY	0x01
+/* Need to disable delay on MAC side */
+#define AST2600_RGMII_DIS_DELAY		0x02
+
 #endif /* __FTGMAC100_H */

-- 
2.34.1

Re: [PATCH net-next v5 3/4] net: ftgmac100: Add RGMII delay support for AST2600

[Andrew Lunn]

> @@ -1907,6 +2179,10 @@ static int ftgmac100_probe(struct platform_device *pdev)
>  		priv->rxdes0_edorr_mask = BIT(30);
>  		priv->txdes0_edotr_mask = BIT(30);
>  		priv->is_aspeed = true;
> +		/* Configure RGMII delay if there are the corresponding compatibles */
> +		err = ftgmac100_set_internal_delay(priv, &phy_intf);
> +		if (err)
> +			goto err_phy_connect;

Thinking forward to when you add 2700 support, i really think you need
to break the probe up into helpers for 2500 and before, 2600 and in
the future 2700. You currently have a couple of tests on the
compatible which you can reduce to one.

In fact, this driver has 10 calls to of_device_is_compatible(). I
think you should first refactor the code to list each compatible in
ftgmac100_of_match[], and add a data structure which contains an enum
of the MAC type. You can then transfer this to priv, and replace all
the of_device_is_compatible() tests to just look at the enum value.

	Andrew

Re: [PATCH net-next v5 3/4] net: ftgmac100: Add RGMII delay support for AST2600

[Rob Herring]

On Sat, Dec 06, 2025 at 07:30:30PM +0100, Andrew Lunn wrote:
> > @@ -1907,6 +2179,10 @@ static int ftgmac100_probe(struct platform_device *pdev)
> >  		priv->rxdes0_edorr_mask = BIT(30);
> >  		priv->txdes0_edotr_mask = BIT(30);
> >  		priv->is_aspeed = true;
> > +		/* Configure RGMII delay if there are the corresponding compatibles */
> > +		err = ftgmac100_set_internal_delay(priv, &phy_intf);
> > +		if (err)
> > +			goto err_phy_connect;
> 
> Thinking forward to when you add 2700 support, i really think you need
> to break the probe up into helpers for 2500 and before, 2600 and in
> the future 2700. You currently have a couple of tests on the
> compatible which you can reduce to one.
> 
> In fact, this driver has 10 calls to of_device_is_compatible(). I
> think you should first refactor the code to list each compatible in
> ftgmac100_of_match[], and add a data structure which contains an enum
> of the MAC type. You can then transfer this to priv, and replace all
> the of_device_is_compatible() tests to just look at the enum value.

Better yet, define a structure which defines the different settings 
directly. Such as:

priv->rxdes0_edorr_mask
priv->txdes0_edotr_mask
priv->is_aspeed

And anything else needed...

Rob

[PATCH net-next v5 4/4] ARM: dts: aspeed: ast2600-evb: Configure RGMII delay for MAC

[Jacky Chou]

This change sets the rx-internal-delay-ps and tx-internal-delay-ps
properties to control the RGMII signal delay.
The phy-mode for MAC0–MAC3 is updated to "rgmii-id" to enable TX/RX
internal delay on the PHY and disable the corresponding delay
on the MAC.

Signed-off-by: Jacky Chou <jacky_chou@aspeedtech.com>
---
 arch/arm/boot/dts/aspeed/aspeed-ast2600-evb.dts | 20 ++++++++++++++++----
 1 file changed, 16 insertions(+), 4 deletions(-)

diff --git a/arch/arm/boot/dts/aspeed/aspeed-ast2600-evb.dts b/arch/arm/boot/dts/aspeed/aspeed-ast2600-evb.dts
index de83c0eb1d6e..f8f0d5c98514 100644
--- a/arch/arm/boot/dts/aspeed/aspeed-ast2600-evb.dts
+++ b/arch/arm/boot/dts/aspeed/aspeed-ast2600-evb.dts
@@ -123,42 +123,54 @@ ethphy3: ethernet-phy@0 {
 &mac0 {
 	status = "okay";
 
-	phy-mode = "rgmii-rxid";
+	phy-mode = "rgmii-id";
 	phy-handle = <&ethphy0>;
 
 	pinctrl-names = "default";
 	pinctrl-0 = <&pinctrl_rgmii1_default>;
+
+	rx-internal-delay-ps = <0>;
+	tx-internal-delay-ps = <0>;
 };
 
 
 &mac1 {
 	status = "okay";
 
-	phy-mode = "rgmii-rxid";
+	phy-mode = "rgmii-id";
 	phy-handle = <&ethphy1>;
 
 	pinctrl-names = "default";
 	pinctrl-0 = <&pinctrl_rgmii2_default>;
+
+	rx-internal-delay-ps = <0>;
+	tx-internal-delay-ps = <0>;
 };
 
 &mac2 {
 	status = "okay";
 
-	phy-mode = "rgmii";
+	phy-mode = "rgmii-id";
 	phy-handle = <&ethphy2>;
 
 	pinctrl-names = "default";
 	pinctrl-0 = <&pinctrl_rgmii3_default>;
+
+	rx-internal-delay-ps = <0>;
+	tx-internal-delay-ps = <0>;
 };
 
 &mac3 {
 	status = "okay";
 
-	phy-mode = "rgmii";
+	phy-mode = "rgmii-id";
 	phy-handle = <&ethphy3>;
 
 	pinctrl-names = "default";
 	pinctrl-0 = <&pinctrl_rgmii4_default>;
+
+	rx-internal-delay-ps = <0>;
+	tx-internal-delay-ps = <0>;
 };
 
 &emmc_controller {

-- 
2.34.1