net: pse-pd: pd692x0: Separate configuration parsing from hardware setup

Cache the port matrix configuration in driver private data to enable
PSE controller reconfiguration. This refactoring separates device tree
parsing from hardware configuration application, allowing settings to be
reapplied without reparsing the device tree.

This refactoring is a prerequisite for preserving PSE configuration
across reboots to prevent power disruption to connected devices.

Signed-off-by: Kory Maincent <[email protected]>
Reviewed-by: Simon Horman <[email protected]>
Link: https://patch.msgid.link/20251013-feature_pd692x0_reboot_keep_conf-v2-2-68ab082a93dd@bootlin.com
Signed-off-by: Jakub Kicinski <[email protected]>

Author: kmaincent

drivers/net/pse-pd/pd692x0.c

@@ -85,6 +85,11 @@ enum {
 	PD692X0_MSG_CNT
 };
 
+struct pd692x0_matrix {
+	u8 hw_port_a;
+	u8 hw_port_b;
+};
+
 struct pd692x0_priv {
 	struct i2c_client *client;
 	struct pse_controller_dev pcdev;
@@ -101,6 +106,8 @@ struct pd692x0_priv {
 	enum ethtool_c33_pse_admin_state admin_state[PD692X0_MAX_PIS];
 	struct regulator_dev *manager_reg[PD692X0_MAX_MANAGERS];
 	int manager_pw_budget[PD692X0_MAX_MANAGERS];
+	int nmanagers;
+	struct pd692x0_matrix *port_matrix;
 };
 
 /* Template list of communication messages. The non-null bytes defined here
@@ -809,11 +816,6 @@ struct pd692x0_manager {
 	int nports;
 };
 
-struct pd692x0_matrix {
-	u8 hw_port_a;
-	u8 hw_port_b;
-};
-
 static int
 pd692x0_of_get_ports_manager(struct pd692x0_priv *priv,
 			     struct pd692x0_manager *manager,
@@ -903,7 +905,8 @@ pd692x0_of_get_managers(struct pd692x0_priv *priv,
 	}
 
 	of_node_put(managers_node);
-	return nmanagers;
+	priv->nmanagers = nmanagers;
+	return 0;
 
 out:
 	for (i = 0; i < nmanagers; i++) {
@@ -963,8 +966,7 @@ pd692x0_register_manager_regulator(struct device *dev, char *reg_name,
 
 static int
 pd692x0_register_managers_regulator(struct pd692x0_priv *priv,
-				    const struct pd692x0_manager *manager,
-				    int nmanagers)
+				    const struct pd692x0_manager *manager)
 {
 	struct device *dev = &priv->client->dev;
 	size_t reg_name_len;
@@ -975,7 +977,7 @@ pd692x0_register_managers_regulator(struct pd692x0_priv *priv,
 	 */
 	reg_name_len = strlen(dev_name(dev)) + 23;
 
-	for (i = 0; i < nmanagers; i++) {
+	for (i = 0; i < priv->nmanagers; i++) {
 		static const char * const regulators[] = { "vaux5", "vaux3p3" };
 		struct regulator_dev *rdev;
 		char *reg_name;
@@ -1008,10 +1010,14 @@ pd692x0_register_managers_regulator(struct pd692x0_priv *priv,
 }
 
 static int
-pd692x0_conf_manager_power_budget(struct pd692x0_priv *priv, int id, int pw)
+pd692x0_conf_manager_power_budget(struct pd692x0_priv *priv, int id)
 {
 	struct pd692x0_msg msg, buf;
-	int ret, pw_mW = pw / 1000;
+	int ret, pw_mW;
+
+	pw_mW = priv->manager_pw_budget[id] / 1000;
+	if (!pw_mW)
+		return 0;
 
 	msg = pd692x0_msg_template_list[PD692X0_MSG_GET_POWER_BANK];
 	msg.data[0] = id;
@@ -1032,11 +1038,11 @@ pd692x0_conf_manager_power_budget(struct pd692x0_priv *priv, int id, int pw)
 }
 
 static int
-pd692x0_configure_managers(struct pd692x0_priv *priv, int nmanagers)
+pd692x0_req_managers_pw_budget(struct pd692x0_priv *priv)
 {
 	int i, ret;
 
-	for (i = 0; i < nmanagers; i++) {
+	for (i = 0; i < priv->nmanagers; i++) {
 		struct regulator *supply = priv->manager_reg[i]->supply;
 		int pw_budget;
 
@@ -1053,7 +1059,18 @@ pd692x0_configure_managers(struct pd692x0_priv *priv, int nmanagers)
 			return ret;
 
 		priv->manager_pw_budget[i] = pw_budget;
-		ret = pd692x0_conf_manager_power_budget(priv, i, pw_budget);
+	}
+
+	return 0;
+}
+
+static int
+pd692x0_configure_managers(struct pd692x0_priv *priv)
+{
+	int i, ret;
+
+	for (i = 0; i < priv->nmanagers; i++) {
+		ret = pd692x0_conf_manager_power_budget(priv, i);
 		if (ret < 0)
 			return ret;
 	}
@@ -1101,10 +1118,9 @@ pd692x0_set_port_matrix(const struct pse_pi_pairset *pairset,
 
 static int
 pd692x0_set_ports_matrix(struct pd692x0_priv *priv,
-			 const struct pd692x0_manager *manager,
-			 int nmanagers,
-			 struct pd692x0_matrix port_matrix[PD692X0_MAX_PIS])
+			 const struct pd692x0_manager *manager)
 {
+	struct pd692x0_matrix *port_matrix = priv->port_matrix;
 	struct pse_controller_dev *pcdev = &priv->pcdev;
 	int i, ret;
 
@@ -1117,7 +1133,7 @@ pd692x0_set_ports_matrix(struct pd692x0_priv *priv,
 	/* Update with values for every PSE PIs */
 	for (i = 0; i < pcdev->nr_lines; i++) {
 		ret = pd692x0_set_port_matrix(&pcdev->pi[i].pairset[0],
-					      manager, nmanagers,
+					      manager, priv->nmanagers,
 					      &port_matrix[i]);
 		if (ret) {
 			dev_err(&priv->client->dev,
@@ -1126,7 +1142,7 @@ pd692x0_set_ports_matrix(struct pd692x0_priv *priv,
 		}
 
 		ret = pd692x0_set_port_matrix(&pcdev->pi[i].pairset[1],
-					      manager, nmanagers,
+					      manager, priv->nmanagers,
 					      &port_matrix[i]);
 		if (ret) {
 			dev_err(&priv->client->dev,
@@ -1139,9 +1155,9 @@ pd692x0_set_ports_matrix(struct pd692x0_priv *priv,
 }
 
 static int
-pd692x0_write_ports_matrix(struct pd692x0_priv *priv,
-			   const struct pd692x0_matrix port_matrix[PD692X0_MAX_PIS])
+pd692x0_write_ports_matrix(struct pd692x0_priv *priv)
 {
+	struct pd692x0_matrix *port_matrix = priv->port_matrix;
 	struct pd692x0_msg msg, buf;
 	int ret, i;
 
@@ -1166,13 +1182,32 @@ pd692x0_write_ports_matrix(struct pd692x0_priv *priv,
 	return 0;
 }
 
+static int pd692x0_hw_conf_init(struct pd692x0_priv *priv)
+{
+	int ret;
+
+	/* Is PD692x0 ready to be configured? */
+	if (priv->fw_state != PD692X0_FW_OK &&
+	    priv->fw_state != PD692X0_FW_COMPLETE)
+		return 0;
+
+	ret = pd692x0_configure_managers(priv);
+	if (ret)
+		return ret;
+
+	ret = pd692x0_write_ports_matrix(priv);
+	if (ret)
+		return ret;
+
+	return 0;
+}
+
 static void pd692x0_of_put_managers(struct pd692x0_priv *priv,
-				    struct pd692x0_manager *manager,
-				    int nmanagers)
+				    struct pd692x0_manager *manager)
 {
 	int i, j;
 
-	for (i = 0; i < nmanagers; i++) {
+	for (i = 0; i < priv->nmanagers; i++) {
 		for (j = 0; j < manager[i].nports; j++)
 			of_node_put(manager[i].port_node[j]);
 		of_node_put(manager[i].node);
@@ -1201,48 +1236,50 @@ static void pd692x0_managers_free_pw_budget(struct pd692x0_priv *priv)
 static int pd692x0_setup_pi_matrix(struct pse_controller_dev *pcdev)
 {
 	struct pd692x0_priv *priv = to_pd692x0_priv(pcdev);
-	struct pd692x0_matrix port_matrix[PD692X0_MAX_PIS];
+	struct pd692x0_matrix *port_matrix;
 	struct pd692x0_manager *manager;
-	int ret, nmanagers;
-
-	/* Should we flash the port matrix */
-	if (priv->fw_state != PD692X0_FW_OK &&
-	    priv->fw_state != PD692X0_FW_COMPLETE)
-		return 0;
+	int ret;
 
 	manager = kcalloc(PD692X0_MAX_MANAGERS, sizeof(*manager), GFP_KERNEL);
 	if (!manager)
 		return -ENOMEM;
 
+	port_matrix = devm_kcalloc(&priv->client->dev, PD692X0_MAX_PIS,
+				   sizeof(*port_matrix), GFP_KERNEL);
+	if (!port_matrix) {
+		ret = -ENOMEM;
+		goto err_free_manager;
+	}
+	priv->port_matrix = port_matrix;
+
 	ret = pd692x0_of_get_managers(priv, manager);
 	if (ret < 0)
 		goto err_free_manager;
 
-	nmanagers = ret;
-	ret = pd692x0_register_managers_regulator(priv, manager, nmanagers);
+	ret = pd692x0_register_managers_regulator(priv, manager);
 	if (ret)
 		goto err_of_managers;
 
-	ret = pd692x0_configure_managers(priv, nmanagers);
+	ret = pd692x0_req_managers_pw_budget(priv);
 	if (ret)
 		goto err_of_managers;
 
-	ret = pd692x0_set_ports_matrix(priv, manager, nmanagers, port_matrix);
+	ret = pd692x0_set_ports_matrix(priv, manager);
 	if (ret)
 		goto err_managers_req_pw;
 
-	ret = pd692x0_write_ports_matrix(priv, port_matrix);
+	ret = pd692x0_hw_conf_init(priv);
 	if (ret)
 		goto err_managers_req_pw;
 
-	pd692x0_of_put_managers(priv, manager, nmanagers);
+	pd692x0_of_put_managers(priv, manager);
 	kfree(manager);
 	return 0;
 
 err_managers_req_pw:
 	pd692x0_managers_free_pw_budget(priv);
 err_of_managers:
-	pd692x0_of_put_managers(priv, manager, nmanagers);
+	pd692x0_of_put_managers(priv, manager);
 err_free_manager:
 	kfree(manager);
 	return ret;
@@ -1647,7 +1684,7 @@ static enum fw_upload_err pd692x0_fw_poll_complete(struct fw_upload *fwl)
 		return FW_UPLOAD_ERR_FW_INVALID;
 	}
 
-	ret = pd692x0_setup_pi_matrix(&priv->pcdev);
+	ret = pd692x0_hw_conf_init(priv);
 	if (ret < 0) {
 		dev_err(&client->dev, "Error configuring ports matrix (%pe)\n",
 			ERR_PTR(ret));