net: pse-pd: Introduce PSE types enumeration

Introduce an enumeration to define PSE types (C33 or PoDL),
utilizing a bitfield for potential future support of both types.
Include 'pse_get_types' helper for external access to PSE type info.
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: Kory Maincent <kory.maincent@bootlin.com>
Link: https://lore.kernel.org/r/20240417-feature_poe-v9-2-242293fd1900@bootlin.comSigned-off-by: Jakub Kicinski <kuba@kernel.org>

drivers/net/pse-pd/pse_core.c

@@ -312,3 +312,15 @@ int pse_ethtool_set_config(struct pse_control *psec,
 	return err;
 }
 EXPORT_SYMBOL_GPL(pse_ethtool_set_config);
+
+bool pse_has_podl(struct pse_control *psec)
+{
+	return psec->pcdev->types & ETHTOOL_PSE_PODL;
+}
+EXPORT_SYMBOL_GPL(pse_has_podl);
+
+bool pse_has_c33(struct pse_control *psec)
+{
+	return psec->pcdev->types & ETHTOOL_PSE_C33;
+}
+EXPORT_SYMBOL_GPL(pse_has_c33);

drivers/net/pse-pd/pse_regulator.c

@@ -116,6 +116,7 @@ pse_reg_probe(struct platform_device *pdev)
 	priv->pcdev.owner = THIS_MODULE;
 	priv->pcdev.ops = &pse_reg_ops;
 	priv->pcdev.dev = dev;
+	priv->pcdev.types = ETHTOOL_PSE_PODL;
 	ret = devm_pse_controller_register(dev, &priv->pcdev);
 	if (ret) {
 		dev_err(dev, "failed to register PSE controller (%pe)\n",

include/linux/pse-pd/pse.h

@@ -77,6 +77,7 @@ struct pse_control;
  *            device tree to id as given to the PSE control ops
  * @nr_lines: number of PSE controls in this controller device
  * @lock: Mutex for serialization access to the PSE controller
+ * @types: types of the PSE controller
  */
 struct pse_controller_dev {
 	const struct pse_controller_ops *ops;
@@ -89,6 +90,7 @@ struct pse_controller_dev {
 			const struct of_phandle_args *pse_spec);
 	unsigned int nr_lines;
 	struct mutex lock;
+	enum ethtool_pse_types types;
 };
 
 #if IS_ENABLED(CONFIG_PSE_CONTROLLER)
@@ -108,6 +110,9 @@ int pse_ethtool_set_config(struct pse_control *psec,
 			   struct netlink_ext_ack *extack,
 			   const struct pse_control_config *config);
 
+bool pse_has_podl(struct pse_control *psec);
+bool pse_has_c33(struct pse_control *psec);
+
 #else
 
 static inline struct pse_control *of_pse_control_get(struct device_node *node)
@@ -133,6 +138,16 @@ static inline int pse_ethtool_set_config(struct pse_control *psec,
 	return -ENOTSUPP;
 }
 
+static inline bool pse_has_podl(struct pse_control *psec)
+{
+	return false;
+}
+
+static inline bool pse_has_c33(struct pse_control *psec)
+{
+	return false;
+}
+
 #endif
 
 #endif

include/uapi/linux/ethtool.h

@@ -752,6 +752,18 @@ enum ethtool_module_power_mode {
 	ETHTOOL_MODULE_POWER_MODE_HIGH,
 };
 
+/**
+ * enum ethtool_pse_types - Types of PSE controller.
+ * @ETHTOOL_PSE_UNKNOWN: Type of PSE controller is unknown
+ * @ETHTOOL_PSE_PODL: PSE controller which support PoDL
+ * @ETHTOOL_PSE_C33: PSE controller which support Clause 33 (PoE)
+ */
+enum ethtool_pse_types {
+	ETHTOOL_PSE_UNKNOWN =	1 << 0,
+	ETHTOOL_PSE_PODL =	1 << 1,
+	ETHTOOL_PSE_C33 =	1 << 2,
+};
+
 /**
  * enum ethtool_c33_pse_admin_state - operational state of the PoDL PSE
  *	functions. IEEE 802.3-2022 30.9.1.1.2 aPSEAdminState