[PATCH v3 0/3] net: stmmac: dwmac-sophgo: Add phy interface filter

[PATCH v3 0/3] net: stmmac: dwmac-sophgo: Add phy interface filter

[Inochi Amaoto]

As the SG2042 has an internal rx delay, the delay should be remove
when init the mac, otherwise the phy will be misconfigurated.

Since this delay fix is common for other MACs, add a common helper
for it. And use it to fix SG2042.

Change from v2:
- https://lore.kernel.org/all/20251020095500.1330057-1-inochiama@gmail.com
1. patch 3: fix comment typo
2. patch 3: add check for PHY_INTERFACE_MODE_NA.

Change from v1:
- https://lore.kernel.org/all/20251017011802.523140-1-inochiama@gmail.com
1. Add phy-mode property to dt-bindings of sophgo,sg2044-dwmac
2. Add common helper for fixing RGMII phy mode
3. Use struct to hold the compatiable data.

Inochi Amaoto (3):
  dt-bindings: net: sophgo,sg2044-dwmac: add phy mode restriction
  net: phy: Add helper for fixing RGMII PHY mode based on internal mac
    delay
  net: stmmac: dwmac-sophgo: Add phy interface filter

 .../bindings/net/sophgo,sg2044-dwmac.yaml     | 17 ++++++++
 .../ethernet/stmicro/stmmac/dwmac-sophgo.c    | 20 ++++++++-
 drivers/net/phy/phy-core.c                    | 43 +++++++++++++++++++
 include/linux/phy.h                           |  3 ++
 4 files changed, 82 insertions(+), 1 deletion(-)

--
2.51.1

[PATCH v3 1/3] dt-bindings: net: sophgo,sg2044-dwmac: add phy mode restriction

[Inochi Amaoto]

As the ethernet controller of SG2044 and SG2042 only supports
RGMII phy. Add phy-mode property to restrict the value.

Also, since SG2042 has internal rx delay in its mac, make
only "rgmii-txid" and "rgmii-id" valid for phy-mode.

Signed-off-by: Inochi Amaoto <inochiama@gmail.com>
---
 .../bindings/net/sophgo,sg2044-dwmac.yaml       | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

diff --git a/Documentation/devicetree/bindings/net/sophgo,sg2044-dwmac.yaml b/Documentation/devicetree/bindings/net/sophgo,sg2044-dwmac.yaml
index ce21979a2d9a..0f1523dc0e36 100644
--- a/Documentation/devicetree/bindings/net/sophgo,sg2044-dwmac.yaml
+++ b/Documentation/devicetree/bindings/net/sophgo,sg2044-dwmac.yaml
@@ -52,6 +52,13 @@ properties:
   interrupt-names:
     maxItems: 1
 
+  phy-mode:
+    enum:
+      - rgmii
+      - rgmii-rxid
+      - rgmii-txid
+      - rgmii-id
+
   resets:
     maxItems: 1
 
@@ -70,6 +77,16 @@ required:
 
 allOf:
   - $ref: snps,dwmac.yaml#
+  - if:
+      properties:
+        compatible:
+          contains:
+            const: sophgo,sg2042-dwmac
+    then:
+      phy-mode:
+        enum:
+          - rgmii-txid
+          - rgmii-id
 
 unevaluatedProperties: false
 
-- 
2.51.1

[PATCH v3 2/3] net: phy: Add helper for fixing RGMII PHY mode based on internal mac delay

[Inochi Amaoto]

The "phy-mode" property of devicetree indicates whether the PCB has
delay now, which means the mac needs to modify the PHY mode based
on whether there is an internal delay in the mac.

This modification is similar for many ethernet drivers. To simplify
code, define the helper phy_fix_phy_mode_for_mac_delays(speed, mac_txid,
mac_rxid) to fix PHY mode based on whether mac adds internal delay.

Suggested-by: Russell King (Oracle) <linux@armlinux.org.uk>
Signed-off-by: Inochi Amaoto <inochiama@gmail.com>
---
 drivers/net/phy/phy-core.c | 43 ++++++++++++++++++++++++++++++++++++++
 include/linux/phy.h        |  3 +++
 2 files changed, 46 insertions(+)

diff --git a/drivers/net/phy/phy-core.c b/drivers/net/phy/phy-core.c
index 605ca20ae192..4f258fb409da 100644
--- a/drivers/net/phy/phy-core.c
+++ b/drivers/net/phy/phy-core.c
@@ -101,6 +101,49 @@ const char *phy_rate_matching_to_str(int rate_matching)
 }
 EXPORT_SYMBOL_GPL(phy_rate_matching_to_str);
 
+/**
+ * phy_fix_phy_mode_for_mac_delays - Convenience function for fixing PHY
+ * mode based on whether mac adds internal delay
+ *
+ * @interface: The current interface mode of the port
+ * @mac_txid: True if the mac adds internal tx delay
+ * @mac_rxid: True if the mac adds internal rx delay
+ *
+ * Return fixed PHY mode, or PHY_INTERFACE_MODE_NA if the interface can
+ * not apply the internal delay
+ */
+phy_interface_t phy_fix_phy_mode_for_mac_delays(phy_interface_t interface,
+						bool mac_txid, bool mac_rxid)
+{
+	if (!phy_interface_mode_is_rgmii(interface))
+		return interface;
+
+	if (mac_txid && mac_rxid) {
+		if (interface == PHY_INTERFACE_MODE_RGMII_ID)
+			return PHY_INTERFACE_MODE_RGMII;
+		return PHY_INTERFACE_MODE_NA;
+	}
+
+	if (mac_txid) {
+		if (interface == PHY_INTERFACE_MODE_RGMII_ID)
+			return PHY_INTERFACE_MODE_RGMII_RXID;
+		if (interface == PHY_INTERFACE_MODE_RGMII_TXID)
+			return PHY_INTERFACE_MODE_RGMII;
+		return PHY_INTERFACE_MODE_NA;
+	}
+
+	if (mac_rxid) {
+		if (interface == PHY_INTERFACE_MODE_RGMII_ID)
+			return PHY_INTERFACE_MODE_RGMII_TXID;
+		if (interface == PHY_INTERFACE_MODE_RGMII_RXID)
+			return PHY_INTERFACE_MODE_RGMII;
+		return PHY_INTERFACE_MODE_NA;
+	}
+
+	return interface;
+}
+EXPORT_SYMBOL_GPL(phy_fix_phy_mode_for_mac_delays);
+
 /**
  * phy_interface_num_ports - Return the number of links that can be carried by
  *			     a given MAC-PHY physical link. Returns 0 if this is
diff --git a/include/linux/phy.h b/include/linux/phy.h
index 3c7634482356..0bc00a4cceb2 100644
--- a/include/linux/phy.h
+++ b/include/linux/phy.h
@@ -1813,6 +1813,9 @@ static inline bool phy_is_pseudo_fixed_link(struct phy_device *phydev)
 	return phydev->is_pseudo_fixed_link;
 }
 
+phy_interface_t phy_fix_phy_mode_for_mac_delays(phy_interface_t interface,
+						bool mac_txid, bool mac_rxid);
+
 int phy_save_page(struct phy_device *phydev);
 int phy_select_page(struct phy_device *phydev, int page);
 int phy_restore_page(struct phy_device *phydev, int oldpage, int ret);
-- 
2.51.1

[PATCH v3 3/3] net: stmmac: dwmac-sophgo: Add phy interface filter

[Inochi Amaoto]

As the SG2042 has an internal rx delay, the delay should be removed
when initializing the mac, otherwise the phy will be misconfigurated.

Fixes: 543009e2d4cd ("net: stmmac: dwmac-sophgo: Add support for Sophgo SG2042 SoC")
Signed-off-by: Inochi Amaoto <inochiama@gmail.com>
Tested-by: Han Gao <rabenda.cn@gmail.com>
---
 .../ethernet/stmicro/stmmac/dwmac-sophgo.c    | 20 ++++++++++++++++++-
 1 file changed, 19 insertions(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac-sophgo.c b/drivers/net/ethernet/stmicro/stmmac/dwmac-sophgo.c
index 3b7947a7a7ba..7f0ca4249a13 100644
--- a/drivers/net/ethernet/stmicro/stmmac/dwmac-sophgo.c
+++ b/drivers/net/ethernet/stmicro/stmmac/dwmac-sophgo.c
@@ -7,11 +7,16 @@
 
 #include <linux/clk.h>
 #include <linux/module.h>
+#include <linux/property.h>
 #include <linux/mod_devicetable.h>
 #include <linux/platform_device.h>
 
 #include "stmmac_platform.h"
 
+struct sophgo_dwmac_data {
+	bool has_internal_rx_delay;
+};
+
 static int sophgo_sg2044_dwmac_init(struct platform_device *pdev,
 				    struct plat_stmmacenet_data *plat_dat,
 				    struct stmmac_resources *stmmac_res)
@@ -32,6 +37,7 @@ static int sophgo_sg2044_dwmac_init(struct platform_device *pdev,
 static int sophgo_dwmac_probe(struct platform_device *pdev)
 {
 	struct plat_stmmacenet_data *plat_dat;
+	const struct sophgo_dwmac_data *data;
 	struct stmmac_resources stmmac_res;
 	struct device *dev = &pdev->dev;
 	int ret;
@@ -50,11 +56,23 @@ static int sophgo_dwmac_probe(struct platform_device *pdev)
 	if (ret)
 		return ret;
 
+	data = device_get_match_data(&pdev->dev);
+	if (data && data->has_internal_rx_delay) {
+		plat_dat->phy_interface = phy_fix_phy_mode_for_mac_delays(plat_dat->phy_interface,
+									  false, true);
+		if (plat_dat->phy_interface == PHY_INTERFACE_MODE_NA)
+			return -EINVAL;
+	}
+
 	return stmmac_dvr_probe(dev, plat_dat, &stmmac_res);
 }
 
+static struct sophgo_dwmac_data sg2042_dwmac_data = {
+	.has_internal_rx_delay = true,
+};
+
 static const struct of_device_id sophgo_dwmac_match[] = {
-	{ .compatible = "sophgo,sg2042-dwmac" },
+	{ .compatible = "sophgo,sg2042-dwmac", .data = &sg2042_dwmac_data },
 	{ .compatible = "sophgo,sg2044-dwmac" },
 	{ /* sentinel */ }
 };
-- 
2.51.1

Re: [PATCH v3 1/3] dt-bindings: net: sophgo,sg2044-dwmac: add phy mode restriction

[Rob Herring (Arm)]

On Fri, 24 Oct 2025 09:55:22 +0800, Inochi Amaoto wrote:
> As the ethernet controller of SG2044 and SG2042 only supports
> RGMII phy. Add phy-mode property to restrict the value.
> 
> Also, since SG2042 has internal rx delay in its mac, make
> only "rgmii-txid" and "rgmii-id" valid for phy-mode.
> 
> Signed-off-by: Inochi Amaoto <inochiama@gmail.com>
> ---
>  .../bindings/net/sophgo,sg2044-dwmac.yaml       | 17 +++++++++++++++++
>  1 file changed, 17 insertions(+)
> 

My bot found errors running 'make dt_binding_check' on your patch:

yamllint warnings/errors:

dtschema/dtc warnings/errors:
/builds/robherring/dt-review-ci/linux/Documentation/devicetree/bindings/net/sophgo,sg2044-dwmac.yaml: allOf:1:then: 'anyOf' conditional failed, one must be fixed:
	'phy-mode' is not one of ['$ref', 'additionalItems', 'additionalProperties', 'allOf', 'anyOf', 'const', 'contains', 'default', 'dependencies', 'dependentRequired', 'dependentSchemas', 'deprecated', 'description', 'else', 'enum', 'exclusiveMaximum', 'exclusiveMinimum', 'items', 'if', 'minItems', 'minimum', 'maxItems', 'maximum', 'multipleOf', 'not', 'oneOf', 'pattern', 'patternProperties', 'properties', 'required', 'then', 'typeSize', 'unevaluatedProperties', 'uniqueItems']
	'type' was expected
	from schema $id: http://devicetree.org/meta-schemas/keywords.yaml

doc reference errors (make refcheckdocs):

See https://patchwork.ozlabs.org/project/devicetree-bindings/patch/20251024015524.291013-2-inochiama@gmail.com

The base for the series is generally the latest rc1. A different dependency
should be noted in *this* patch.

If you already ran 'make dt_binding_check' and didn't see the above
error(s), then make sure 'yamllint' is installed and dt-schema is up to
date:

pip3 install dtschema --upgrade

Please check and re-submit after running the above command yourself. Note
that DT_SCHEMA_FILES can be set to your schema file to speed up checking
your schema. However, it must be unset to test all examples with your schema.