dts: bindings: ethernet: Remove fixed link

Remove ethernet-fixed-link binding as it is redundant with the
phy bindings. Clearly, ethernet does not work without the L1
layer, which is a phy device, or an integrated mac/phy device,
and all of these things should be described properly in DT.
The schema did not even come with a compatible, meaning nodelabels
were hardcoded into the drivers, which is unacceptable.

- Remove the binding file for ethernet-fixed-link.yaml.
- Remove fixed link functionality from the nxp s32 gmac driver.
  Since this functionality is already covered by the phy support,
  it is redundant.
- Remove fixed link include from the s32 gmac binding.
- Remove fixed link include from the nuvoton numaker binding.
  As far as I can tell the corresonding driver does not even
  use it anyways, and I did not find any board with this device
  that describes a "fixed link".
- Move the definition into the nxp,kinetis-ethernet binding
  as the eth_mcux driver, which is already being deprecated,
  does use this, contain the debt to the legacy driver.

(cherry picked from commit 353c6a6)

Original-Signed-off-by: Declan Snyder <declan.snyder@nxp.com>
GitOrigin-RevId: 353c6a6
Change-Id: I59bd98001107f816c5033f65f62a0d01b6f96170
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/third_party/zephyr/+/5402704
Tested-by: Keith Short <keithshort@chromium.org>
Reviewed-by: Fabio Baltieri <fabiobaltieri@google.com>
Commit-Queue: Fabio Baltieri <fabiobaltieri@google.com>

drivers/ethernet/eth_nxp_s32_gmac.c

@@ -649,29 +649,6 @@ BUILD_ASSERT((CONFIG_ETH_NXP_S32_RX_RING_BUF_SIZE % FEATURE_GMAC_DATA_BUS_WIDTH_
 BUILD_ASSERT((CONFIG_ETH_NXP_S32_TX_RING_BUF_SIZE % FEATURE_GMAC_DATA_BUS_WIDTH_BYTES) == 0,
 		"CONFIG_ETH_NXP_S32_TX_RING_BUF_SIZE must be multiple of the data bus width");
 
-#define ETH_NXP_S32_FIXED_LINK_NODE(n)							\
-	DT_INST_CHILD(n, fixed_link)
-
-#define ETH_NXP_S32_IS_FIXED_LINK(n)							\
-	DT_NODE_EXISTS(ETH_NXP_S32_FIXED_LINK_NODE(n))
-
-#define ETH_NXP_S32_FIXED_LINK_SPEED(n)							\
-	DT_PROP(ETH_NXP_S32_FIXED_LINK_NODE(n), speed)
-
-#define ETH_NXP_S32_FIXED_LINK_FULL_DUPLEX(n)						\
-	DT_PROP(ETH_NXP_S32_FIXED_LINK_NODE(n), full_duplex)
-
-#define ETH_NXP_S32_MAC_SPEED(n)							\
-	COND_CODE_1(ETH_NXP_S32_IS_FIXED_LINK(n),					\
-		(_CONCAT(_CONCAT(GMAC_SPEED_, ETH_NXP_S32_FIXED_LINK_SPEED(n)), M)),	\
-		(GMAC_SPEED_100M))
-
-#define ETH_NXP_S32_MAC_DUPLEX(n)							\
-	COND_CODE_1(ETH_NXP_S32_IS_FIXED_LINK(n),					\
-		(COND_CODE_1(ETH_NXP_S32_FIXED_LINK_FULL_DUPLEX(n),			\
-			(GMAC_FULL_DUPLEX), (GMAC_HALF_DUPLEX))),			\
-		(GMAC_FULL_DUPLEX))
-
 #define ETH_NXP_S32_MAC_MII(n)								\
 	_CONCAT(_CONCAT(GMAC_, DT_INST_STRING_UPPER_TOKEN(n, phy_connection_type)), _MODE)
 
@@ -803,8 +780,8 @@ BUILD_ASSERT((CONFIG_ETH_NXP_S32_TX_RING_BUF_SIZE % FEATURE_GMAC_DATA_BUS_WIDTH_
 		.Callback = NULL,							\
 		.TxSchedAlgo = GMAC_SCHED_ALGO_SP,					\
 		.MiiMode = ETH_NXP_S32_MAC_MII(n),					\
-		.Speed = ETH_NXP_S32_MAC_SPEED(n),					\
-		.Duplex = ETH_NXP_S32_MAC_DUPLEX(n),					\
+		.Speed = GMAC_SPEED_100M,						\
+		.Duplex = GMAC_FULL_DUPLEX,						\
 		.MacConfig = ETH_NXP_S32_MAC_CONF(n),					\
 		.MacPktFilterConfig = ETH_NXP_S32_MAC_PKT_FILTER(n),			\
 		.EnableCtrl = false,							\
@@ -837,9 +814,8 @@ BUILD_ASSERT((CONFIG_ETH_NXP_S32_TX_RING_BUF_SIZE % FEATURE_GMAC_DATA_BUS_WIDTH_
 		ETH_NXP_S32_HW_INSTANCE_CHECK, (|), n)
 
 #define ETH_NXP_S32_PHY_DEV(n)								\
-	COND_CODE_1(ETH_NXP_S32_IS_FIXED_LINK(n), NULL,					\
-		(COND_CODE_1(DT_INST_NODE_HAS_PROP(n, phy_handle),			\
-			(DEVICE_DT_GET(DT_INST_PHANDLE(n, phy_handle))), NULL)))
+	(COND_CODE_1(DT_INST_NODE_HAS_PROP(n, phy_handle),				\
+		(DEVICE_DT_GET(DT_INST_PHANDLE(n, phy_handle))), NULL))
 
 #define ETH_NXP_S32_DEVICE(n)								\
 	ETH_NXP_S32_TX_CALLBACK(n)							\

dts/bindings/ethernet/nuvoton,numaker-ethernet.yaml

@@ -7,7 +7,6 @@ compatible: "nuvoton,numaker-ethernet"
 
 include:
   - ethernet-controller.yaml
-  - ethernet,fixed-link.yaml
   - reset-device.yaml
   - pinctrl-device.yaml
 

dts/bindings/ethernet/nxp,enet-mac.yaml

@@ -5,7 +5,7 @@ description: NXP ENET MAC/L2 Device
 
 compatible: "nxp,enet-mac"
 
-include: ["ethernet-controller.yaml", "ethernet,fixed-link.yaml", "pinctrl-device.yaml"]
+include: ["ethernet-controller.yaml", "pinctrl-device.yaml"]
 
 properties:
   interrupts:

dts/bindings/ethernet/nxp,kinetis-ethernet.yaml

@@ -5,7 +5,7 @@ description: NXP Kinetis Ethernet
 
 compatible: "nxp,kinetis-ethernet"
 
-include: ["ethernet-controller.yaml", "ethernet,fixed-link.yaml", "pinctrl-device.yaml"]
+include: ["ethernet-controller.yaml", "pinctrl-device.yaml"]
 
 properties:
   reg:
@@ -23,3 +23,17 @@ properties:
     type: phandle-array
     description:
       interrupt GPIO for PHY. Will be pulled high before reset is asserted.
+
+child-binding:
+  description: Fixed link ethernet node
+  properties:
+    speed:
+      type: int
+      required: true
+      description: The speed of fixed link
+      enum:
+        - 100
+        - 10
+    full-duplex:
+      type: boolean
+      description: The fixed link operates in full duplex mode

dts/bindings/ethernet/nxp,s32-gmac.yaml

@@ -5,7 +5,7 @@ description: NXP S32 GMAC/EMAC driver
 
 compatible: "nxp,s32-gmac"
 
-include: [ethernet-controller.yaml, "ethernet,fixed-link.yaml", pinctrl-device.yaml]
+include: [ethernet-controller.yaml, pinctrl-device.yaml]
 
 properties:
   reg: