linux-kernel - [PATCH net-next 3/9] net: pse-pd: Introduce PSE types enumeration

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Message-Id: <20231116-feature_poe-v1-3-be48044bf249@bootlin.com>
Date:   Thu, 16 Nov 2023 15:01:35 +0100
From:   Kory Maincent <kory.maincent@...tlin.com>
To:     "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Jonathan Corbet <corbet@....net>,
        Luis Chamberlain <mcgrof@...nel.org>,
        Russ Weight <russ.weight@...ux.dev>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>
Cc:     Thomas Petazzoni <thomas.petazzoni@...tlin.com>,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-doc@...r.kernel.org, devicetree@...r.kernel.org,
        Kory Maincent <kory.maincent@...tlin.com>
Subject: [PATCH net-next 3/9] net: pse-pd: Introduce PSE types enumeration

Introduce an enumeration to define PSE types (PoE or PoDL),
utilizing a bitfield for potential future support of both types.
Include 'pse_get_types' helper for external access to PSE type info

Signed-off-by: Kory Maincent <kory.maincent@...tlin.com>
---
 drivers/net/pse-pd/pse_core.c      |  9 +++++++++
 drivers/net/pse-pd/pse_regulator.c |  1 +
 include/linux/pse-pd/pse.h         | 22 ++++++++++++++++++++++
 3 files changed, 32 insertions(+)

diff --git a/drivers/net/pse-pd/pse_core.c b/drivers/net/pse-pd/pse_core.c
index 146b81f08a89..2959c94f7798 100644
--- a/drivers/net/pse-pd/pse_core.c
+++ b/drivers/net/pse-pd/pse_core.c
@@ -312,3 +312,12 @@ int pse_ethtool_set_config(struct pse_control *psec,
 	return err;
 }
 EXPORT_SYMBOL_GPL(pse_ethtool_set_config);
+
+u32 pse_get_types(struct pse_control *psec)
+{
+	if (!psec->pcdev)
+		return PSE_UNKNOWN;
+	else
+		return psec->pcdev->types;
+}
+EXPORT_SYMBOL_GPL(pse_get_types);
diff --git a/drivers/net/pse-pd/pse_regulator.c b/drivers/net/pse-pd/pse_regulator.c
index 1dedf4de296e..e34ab8526067 100644
--- a/drivers/net/pse-pd/pse_regulator.c
+++ b/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 = PSE_PODL;
 	ret = devm_pse_controller_register(dev, &priv->pcdev);
 	if (ret) {
 		dev_err(dev, "failed to register PSE controller (%pe)\n",
diff --git a/include/linux/pse-pd/pse.h b/include/linux/pse-pd/pse.h
index 25490d0c682d..67a0ff5e480c 100644
--- a/include/linux/pse-pd/pse.h
+++ b/include/linux/pse-pd/pse.h
@@ -44,6 +44,19 @@ struct pse_control_status {
 	enum ethtool_pse_pw_d_status pw_status;
 };
 
+/**
+ * enum - Types of PSE controller.
+ *
+ * @PSE_UNKNOWN: Type of PSE controller is unknown
+ * @PSE_PODL: PSE controller which support PoDL
+ * @PSE_POE: PSE controller which support PoE
+ */
+enum {
+	PSE_UNKNOWN = BIT(0),
+	PSE_PODL = BIT(1),
+	PSE_POE = BIT(2),
+};
+
 /**
  * struct pse_controller_ops - PSE controller driver callbacks
  *
@@ -77,6 +90,7 @@ 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 +103,7 @@ struct pse_controller_dev {
 			const struct of_phandle_args *pse_spec);
 	unsigned int nr_lines;
 	struct mutex lock;
+	u32 types;
 };
 
 #if IS_ENABLED(CONFIG_PSE_CONTROLLER)
@@ -108,6 +123,8 @@ int pse_ethtool_set_config(struct pse_control *psec,
 			   struct netlink_ext_ack *extack,
 			   const struct pse_control_config *config);
 
+u32 pse_get_types(struct pse_control *psec);
+
 #else
 
 static inline struct pse_control *of_pse_control_get(struct device_node *node)
@@ -133,6 +150,11 @@ static inline int pse_ethtool_set_config(struct pse_control *psec,
 	return -ENOTSUPP;
 }
 
+static u32 pse_get_types(struct pse_control *psec)
+{
+	return PSE_UNKNOWN;
+}
+
 #endif
 
 #endif

-- 
2.25.1