[PATCH net-next v5 00/17] net: Add support for Power over Ethernet (PoE)

[PATCH net-next v5 00/17] net: Add support for Power over Ethernet (PoE)

[Kory Maincent]

This patch series aims at adding support for PoE (Power over Ethernet),
based on the already existing support for PoDL (Power over Data Line)
implementation. In addition, it adds support for two specific PoE
controller, the Microchip PD692x0 and the TI TPS23881.

This patch series is sponsored by Dent Project
<dentproject@linuxfoundation.org>.

In detail:
- Patch 1 to 13 prepare net to support PoE devices.
- Patch 14 and 15 add PD692x0 PoE PSE controller driver and its binding.
- Patch 16 and 17 add TI TPS23881 PSE controller driver and its binding.

Changes in v5:
- Fix bindings nit.
- Add supported-polarity parameter to bindings.
- Fix yamllint binding errors.
- Remove the nested lock brought by the use of regulator framework.
- Link to v4: https://lore.kernel.org/r/20240215-feature_poe-v4-0-35bb4c23266c@bootlin.com

Changes in v4:
- Replaced sponsored-by tag by a simple sentence.
- Fix pse_pi node bindings.
- Add pse pi documentation written by Oleksij.
- Link to v3: https://lore.kernel.org/r/20240208-feature_poe-v3-0-531d2674469e@bootlin.com

Changes in v3:
- Add patches to add Oleksij and myself to PSE MAINTAINERS.
- Add patches to add pse devlink.
- Add TI TPS23881 PSE controller driver with its binding.
- Replace pse_get_types helper by pse_has_podl and pse_has_c33
- Changed the PSE core bindings.
- Add a setup_pi_matrix callback.
- Register regulator for each PSE PI (Power Interface).
- Changed the PD692x0 bindings.
- Updated PD692x0 drivers to new bindings and PSE PI description.
- Updated PD692x0 drivers according to the reviews and made fixes.
- Link to v2: https://lore.kernel.org/r/20231201-feature_poe-v2-0-56d8cac607fa@bootlin.com

Changes in v2:
- Extract "firmware_loader: Expand Firmware upload error codes patches" to
  send it alone and get it merge in an immutable branch.
- Add "c33" prefix for PoE variables and enums.
- Enhance few comments.
- Add PSE Documentation.
- Make several changes in pd692x0 driver, mainly for readibility.
- Link to v1: https://lore.kernel.org/r/20231116-feature_poe-v1-0-be48044bf249@bootlin.com

Signed-off-by: Kory Maincent <kory.maincent@bootlin.com>
---
Kory Maincent (17):
      MAINTAINERS: net: Add Oleksij to pse-pd maintainers
      of: property: Add fw_devlink support for pse parent
      net: pse-pd: Rectify and adapt the naming of admin_cotrol member of struct pse_control_config
      ethtool: Expand Ethernet Power Equipment with c33 (PoE) alongside PoDL
      net: pse-pd: Introduce PSE types enumeration
      net: ethtool: pse-pd: Expand pse commands with the PSE PoE interface
      netlink: specs: Modify pse attribute prefix
      netlink: specs: Expand the pse netlink command with PoE interface
      MAINTAINERS: Add myself to pse networking maintainer
      net: pse-pd: Add support for PSE PIs
      dt-bindings: net: pse-pd: Add another way of describing several PSE PIs
      net: pse-pd: Add support for setup_pi_matrix callback
      net: pse-pd: Use regulator framework within PSE framework
      dt-bindings: net: pse-pd: Add bindings for PD692x0 PSE controller
      net: pse-pd: Add PD692x0 PSE controller driver
      dt-bindings: net: pse-pd: Add bindings for TPS23881 PSE controller
      net: pse-pd: Add TI TPS23881 PSE controller driver

 .../bindings/net/pse-pd/microchip,pd692x0.yaml     |  158 +++
 .../bindings/net/pse-pd/pse-controller.yaml        |  100 +-
 .../bindings/net/pse-pd/ti,tps23881.yaml           |   93 ++
 Documentation/netlink/specs/ethtool.yaml           |   33 +-
 Documentation/networking/ethtool-netlink.rst       |   20 +
 Documentation/networking/index.rst                 |    1 +
 Documentation/networking/pse-pd/index.rst          |   10 +
 Documentation/networking/pse-pd/introduction.rst   |   73 ++
 Documentation/networking/pse-pd/pse-pi.rst         |  302 +++++
 MAINTAINERS                                        |    8 +
 drivers/net/mdio/fwnode_mdio.c                     |   29 +-
 drivers/net/pse-pd/Kconfig                         |   20 +
 drivers/net/pse-pd/Makefile                        |    2 +
 drivers/net/pse-pd/pd692x0.c                       | 1223 ++++++++++++++++++++
 drivers/net/pse-pd/pse_core.c                      |  429 ++++++-
 drivers/net/pse-pd/pse_regulator.c                 |   49 +-
 drivers/net/pse-pd/tps23881.c                      |  818 +++++++++++++
 drivers/of/property.c                              |    2 +
 include/linux/pse-pd/pse.h                         |   86 +-
 include/uapi/linux/ethtool.h                       |   55 +
 include/uapi/linux/ethtool_netlink.h               |    3 +
 net/ethtool/pse-pd.c                               |   60 +-
 22 files changed, 3451 insertions(+), 123 deletions(-)
---
base-commit: f308eae1e1cdacca3cef65c7f4f691dfcb0c8976
change-id: 20231024-feature_poe-139490e73403

Best regards,
-- 
Köry Maincent, Bootlin
Embedded Linux and kernel engineering
https://bootlin.com

[PATCH net-next v5 01/17] MAINTAINERS: net: Add Oleksij to pse-pd maintainers

[Kory Maincent]

Oleksij was the first to add support for pse-pd net subsystem.
Add himself to the maintainers seems logical.

This patch is sponsored by Dent Project <dentproject@linuxfoundation.org>.

Acked-by: Oleksij Rempel <o.rempel@pengutronix.de>
Signed-off-by: Kory Maincent <kory.maincent@bootlin.com>
---

Changes in v3:
- New patch
---
 MAINTAINERS | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/MAINTAINERS b/MAINTAINERS
index cfe44a876d8a..4f9b554f79da 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -17690,6 +17690,13 @@ F:	include/net/psample.h
 F:	include/uapi/linux/psample.h
 F:	net/psample
 
+PSE NETWORK DRIVER
+M:	Oleksij Rempel <o.rempel@pengutronix.de>
+L:	netdev@vger.kernel.org
+S:	Maintained
+F:	Documentation/devicetree/bindings/net/pse-pd/
+F:	drivers/net/pse-pd/
+
 PSTORE FILESYSTEM
 M:	Kees Cook <keescook@chromium.org>
 R:	Tony Luck <tony.luck@intel.com>

-- 
2.25.1

[PATCH net-next v5 02/17] of: property: Add fw_devlink support for pse parent

[Kory Maincent]

This allows fw_devlink to create device links between consumers of
a PSE and the supplier of the PSE.

This patch is sponsored by Dent Project <dentproject@linuxfoundation.org>.

Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: Kory Maincent <kory.maincent@bootlin.com>
---

Changes in v3:
- New patch
---
 drivers/of/property.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/of/property.c b/drivers/of/property.c
index b71267c6667c..c14001d40cd2 100644
--- a/drivers/of/property.c
+++ b/drivers/of/property.c
@@ -1240,6 +1240,7 @@ DEFINE_SIMPLE_PROP(leds, "leds", NULL)
 DEFINE_SIMPLE_PROP(backlight, "backlight", NULL)
 DEFINE_SIMPLE_PROP(panel, "panel", NULL)
 DEFINE_SIMPLE_PROP(msi_parent, "msi-parent", "#msi-cells")
+DEFINE_SIMPLE_PROP(pses, "pses", "#pse-cells")
 DEFINE_SUFFIX_PROP(regulators, "-supply", NULL)
 DEFINE_SUFFIX_PROP(gpio, "-gpio", "#gpio-cells")
 
@@ -1344,6 +1345,7 @@ static const struct supplier_bindings of_supplier_bindings[] = {
 	{ .parse_prop = parse_backlight, },
 	{ .parse_prop = parse_panel, },
 	{ .parse_prop = parse_msi_parent, },
+	{ .parse_prop = parse_pses, },
 	{ .parse_prop = parse_gpio_compat, },
 	{ .parse_prop = parse_interrupts, },
 	{ .parse_prop = parse_regulators, },

-- 
2.25.1

[PATCH net-next v5 03/17] net: pse-pd: Rectify and adapt the naming of admin_cotrol member of struct pse_control_config

[Kory Maincent]

In commit 18ff0bcda6d1 ("ethtool: add interface to interact with Ethernet
Power Equipment"), the 'pse_control_config' structure was introduced,
housing a single member labeled 'admin_cotrol' responsible for maintaining
the operational state of the PoDL PSE functions.

A noticeable typographical error exists in the naming of this field
('cotrol' should be corrected to 'control'), which this commit aims to
rectify.

Furthermore, with upcoming extensions of this structure to encompass PoE
functionalities, the field is being renamed to 'podl_admin_state' to
distinctly indicate that this state is tailored specifically for PoDL."

This patch is sponsored by Dent Project <dentproject@linuxfoundation.org>.

Reviewed-by: Oleksij Rempel <o.rempel@pengutronix.de>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: Kory Maincent <kory.maincent@bootlin.com>
---
 drivers/net/pse-pd/pse_regulator.c | 8 ++++----
 include/linux/pse-pd/pse.h         | 4 ++--
 net/ethtool/pse-pd.c               | 2 +-
 3 files changed, 7 insertions(+), 7 deletions(-)

diff --git a/drivers/net/pse-pd/pse_regulator.c b/drivers/net/pse-pd/pse_regulator.c
index e2bf8306ca90..1dedf4de296e 100644
--- a/drivers/net/pse-pd/pse_regulator.c
+++ b/drivers/net/pse-pd/pse_regulator.c
@@ -31,10 +31,10 @@ pse_reg_ethtool_set_config(struct pse_controller_dev *pcdev, unsigned long id,
 	struct pse_reg_priv *priv = to_pse_reg(pcdev);
 	int ret;
 
-	if (priv->admin_state == config->admin_cotrol)
+	if (priv->admin_state == config->podl_admin_control)
 		return 0;
 
-	switch (config->admin_cotrol) {
+	switch (config->podl_admin_control) {
 	case ETHTOOL_PODL_PSE_ADMIN_STATE_ENABLED:
 		ret = regulator_enable(priv->ps);
 		break;
@@ -43,14 +43,14 @@ pse_reg_ethtool_set_config(struct pse_controller_dev *pcdev, unsigned long id,
 		break;
 	default:
 		dev_err(pcdev->dev, "Unknown admin state %i\n",
-			config->admin_cotrol);
+			config->podl_admin_control);
 		ret = -ENOTSUPP;
 	}
 
 	if (ret)
 		return ret;
 
-	priv->admin_state = config->admin_cotrol;
+	priv->admin_state = config->podl_admin_control;
 
 	return 0;
 }
diff --git a/include/linux/pse-pd/pse.h b/include/linux/pse-pd/pse.h
index fb724c65c77b..199cf4ae3cf2 100644
--- a/include/linux/pse-pd/pse.h
+++ b/include/linux/pse-pd/pse.h
@@ -15,11 +15,11 @@ struct pse_controller_dev;
 /**
  * struct pse_control_config - PSE control/channel configuration.
  *
- * @admin_cotrol: set PoDL PSE admin control as described in
+ * @podl_admin_control: set PoDL PSE admin control as described in
  *	IEEE 802.3-2018 30.15.1.2.1 acPoDLPSEAdminControl
  */
 struct pse_control_config {
-	enum ethtool_podl_pse_admin_state admin_cotrol;
+	enum ethtool_podl_pse_admin_state podl_admin_control;
 };
 
 /**
diff --git a/net/ethtool/pse-pd.c b/net/ethtool/pse-pd.c
index cc478af77111..aef57a058f0d 100644
--- a/net/ethtool/pse-pd.c
+++ b/net/ethtool/pse-pd.c
@@ -130,7 +130,7 @@ ethnl_set_pse(struct ethnl_req_info *req_info, struct genl_info *info)
 	struct phy_device *phydev;
 
 	/* this values are already validated by the ethnl_pse_set_policy */
-	config.admin_cotrol = nla_get_u32(tb[ETHTOOL_A_PODL_PSE_ADMIN_CONTROL]);
+	config.podl_admin_control = nla_get_u32(tb[ETHTOOL_A_PODL_PSE_ADMIN_CONTROL]);
 
 	phydev = dev->phydev;
 	if (!phydev) {

-- 
2.25.1

[PATCH net-next v5 04/17] ethtool: Expand Ethernet Power Equipment with c33 (PoE) alongside PoDL

[Kory Maincent]

In the current PSE interface for Ethernet Power Equipment, support is
limited to PoDL. This patch extends the interface to accommodate the
objects specified in IEEE 802.3-2022 145.2 for Power sourcing
Equipment (PSE).

The following objects are now supported and considered mandatory:
- IEEE 802.3-2022 30.9.1.1.5 aPSEPowerDetectionStatus
- IEEE 802.3-2022 30.9.1.1.2 aPSEAdminState
- IEEE 802.3-2022 30.9.1.2.1 aPSEAdminControl

To avoid confusion between "PoDL PSE" and "PoE PSE", which have similar
names but distinct values, we have followed the suggestion of Oleksij
Rempel and Andrew Lunn to maintain separate naming schemes for each,
using c33 (clause 33) prefix for "PoE PSE".
You can find more details in the discussion threads here:
https://lore.kernel.org/netdev/20230912110637.GI780075@pengutronix.de/
https://lore.kernel.org/netdev/2539b109-72ad-470a-9dae-9f53de4f64ec@lunn.ch/

This patch is sponsored by Dent Project <dentproject@linuxfoundation.org>.

Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Reviewed-by: Oleksij Rempel <o.rempel@pengutronix.de>
Signed-off-by: Kory Maincent <kory.maincent@bootlin.com>
---

Changes in v2:
- Rename all the PoE variables and enum with a c33 prefix.
- Add documentation, thanks to Oleksij for having written one.

Changes in v3:
- Fix documentation build warning.
---
 Documentation/networking/index.rst               |  1 +
 Documentation/networking/pse-pd/index.rst        |  9 +++
 Documentation/networking/pse-pd/introduction.rst | 73 ++++++++++++++++++++++++
 include/linux/pse-pd/pse.h                       |  9 +++
 include/uapi/linux/ethtool.h                     | 43 ++++++++++++++
 include/uapi/linux/ethtool_netlink.h             |  3 +
 6 files changed, 138 insertions(+)

diff --git a/Documentation/networking/index.rst b/Documentation/networking/index.rst
index 69f3d6dcd9fd..af7da7006ce8 100644
--- a/Documentation/networking/index.rst
+++ b/Documentation/networking/index.rst
@@ -92,6 +92,7 @@ Contents:
    plip
    ppp_generic
    proc_net_tcp
+   pse-pd/index
    radiotap-headers
    rds
    regulatory
diff --git a/Documentation/networking/pse-pd/index.rst b/Documentation/networking/pse-pd/index.rst
new file mode 100644
index 000000000000..18197bc7303d
--- /dev/null
+++ b/Documentation/networking/pse-pd/index.rst
@@ -0,0 +1,9 @@
+.. SPDX-License-Identifier: GPL-2.0
+
+Power Sourcing Equipment (PSE) Documentation
+============================================
+
+.. toctree::
+   :maxdepth: 2
+
+   introduction
diff --git a/Documentation/networking/pse-pd/introduction.rst b/Documentation/networking/pse-pd/introduction.rst
new file mode 100644
index 000000000000..e3d3faaef717
--- /dev/null
+++ b/Documentation/networking/pse-pd/introduction.rst
@@ -0,0 +1,73 @@
+.. SPDX-License-Identifier: GPL-2.0
+
+Power Sourcing Equipment (PSE) in IEEE 802.3 Standard
+=====================================================
+
+Overview
+--------
+
+Power Sourcing Equipment (PSE) is essential in networks for delivering power
+along with data over Ethernet cables. It usually refers to devices like
+switches and hubs that supply power to Powered Devices (PDs) such as IP
+cameras, VoIP phones, and wireless access points.
+
+PSE vs. PoDL PSE
+----------------
+
+PSE in the IEEE 802.3 standard generally refers to equipment that provides
+power alongside data over Ethernet cables, typically associated with Power over
+Ethernet (PoE).
+
+PoDL PSE, or Power over Data Lines PSE, specifically denotes PSEs operating
+with single balanced twisted-pair PHYs, as per Clause 104 of IEEE 802.3. PoDL
+is significant in contexts like automotive and industrial controls where power
+and data delivery over a single pair is advantageous.
+
+IEEE 802.3-2018 Addendums and Related Clauses
+---------------------------------------------
+
+Key addenda to the IEEE 802.3-2018 standard relevant to power delivery over
+Ethernet are as follows:
+
+- **802.3af (Approved in 2003-06-12)**: Known as PoE in the market, detailed in
+  Clause 33, delivering up to 15.4W of power.
+- **802.3at (Approved in 2009-09-11)**: Marketed as PoE+, enhancing PoE as
+  covered in Clause 33, increasing power delivery to up to 30W.
+- **802.3bt (Approved in 2018-09-27)**: Known as 4PPoE in the market, outlined
+  in Clause 33. Type 3 delivers up to 60W, and Type 4 up to 100W.
+- **802.3bu (Approved in 2016-12-07)**: Formerly referred to as PoDL, detailed
+  in Clause 104. Introduces Classes 0 - 9. Class 9 PoDL PSE delivers up to ~65W
+
+Kernel Naming Convention Recommendations
+----------------------------------------
+
+For clarity and consistency within the Linux kernel's networking subsystem, the
+following naming conventions are recommended:
+
+- For general PSE (PoE) code, use "c33_pse" key words. For example:
+  ``enum ethtool_c33_pse_admin_state c33_admin_control;``.
+  This aligns with Clause 33, encompassing various PoE forms.
+
+- For PoDL PSE - specific code, use "podl_pse". For example:
+  ``enum ethtool_podl_pse_admin_state podl_admin_control;`` to differentiate
+  PoDL PSE settings according to Clause 104.
+
+Summary of Clause 33: Data Terminal Equipment (DTE) Power via Media Dependent Interface (MDI)
+---------------------------------------------------------------------------------------------
+
+Clause 33 of the IEEE 802.3 standard defines the functional and electrical
+characteristics of Powered Device (PD) and Power Sourcing Equipment (PSE).
+These entities enable power delivery using the same generic cabling as for data
+transmission, integrating power with data communication for devices such as
+10BASE-T, 100BASE-TX, or 1000BASE-T.
+
+Summary of Clause 104: Power over Data Lines (PoDL) of Single Balanced Twisted-Pair Ethernet
+--------------------------------------------------------------------------------------------
+
+Clause 104 of the IEEE 802.3 standard delineates the functional and electrical
+characteristics of PoDL Powered Devices (PDs) and PoDL Power Sourcing Equipment
+(PSEs). These are designed for use with single balanced twisted-pair Ethernet
+Physical Layers. In this clause, 'PSE' refers specifically to PoDL PSE, and
+'PD' to PoDL PD. The key intent is to provide devices with a unified interface
+for both data and the power required to process this data over a single
+balanced twisted-pair Ethernet connection.
diff --git a/include/linux/pse-pd/pse.h b/include/linux/pse-pd/pse.h
index 199cf4ae3cf2..be4e5754eb24 100644
--- a/include/linux/pse-pd/pse.h
+++ b/include/linux/pse-pd/pse.h
@@ -17,9 +17,12 @@ struct pse_controller_dev;
  *
  * @podl_admin_control: set PoDL PSE admin control as described in
  *	IEEE 802.3-2018 30.15.1.2.1 acPoDLPSEAdminControl
+ * @c33_admin_control: set PSE admin control as described in
+ *	IEEE 802.3-2022 30.9.1.2.1 acPSEAdminControl
  */
 struct pse_control_config {
 	enum ethtool_podl_pse_admin_state podl_admin_control;
+	enum ethtool_c33_pse_admin_state c33_admin_control;
 };
 
 /**
@@ -29,10 +32,16 @@ struct pse_control_config {
  *	functions. IEEE 802.3-2018 30.15.1.1.2 aPoDLPSEAdminState
  * @podl_pw_status: power detection status of the PoDL PSE.
  *	IEEE 802.3-2018 30.15.1.1.3 aPoDLPSEPowerDetectionStatus:
+ * @c33_admin_state: operational state of the PSE
+ *	functions. IEEE 802.3-2022 30.9.1.1.2 aPSEAdminState
+ * @c33_pw_status: power detection status of the PSE.
+ *	IEEE 802.3-2022 30.9.1.1.5 aPSEPowerDetectionStatus:
  */
 struct pse_control_status {
 	enum ethtool_podl_pse_admin_state podl_admin_state;
 	enum ethtool_podl_pse_pw_d_status podl_pw_status;
+	enum ethtool_c33_pse_admin_state c33_admin_state;
+	enum ethtool_c33_pse_pw_d_status c33_pw_status;
 };
 
 /**
diff --git a/include/uapi/linux/ethtool.h b/include/uapi/linux/ethtool.h
index 06ef6b78b7de..d35f044e88eb 100644
--- a/include/uapi/linux/ethtool.h
+++ b/include/uapi/linux/ethtool.h
@@ -752,6 +752,49 @@ enum ethtool_module_power_mode {
 	ETHTOOL_MODULE_POWER_MODE_HIGH,
 };
 
+/**
+ * enum ethtool_c33_pse_admin_state - operational state of the PoDL PSE
+ *	functions. IEEE 802.3-2022 30.9.1.1.2 aPSEAdminState
+ * @ETHTOOL_C33_PSE_ADMIN_STATE_UNKNOWN: state of PSE functions is unknown
+ * @ETHTOOL_C33_PSE_ADMIN_STATE_DISABLED: PSE functions are disabled
+ * @ETHTOOL_C33_PSE_ADMIN_STATE_ENABLED: PSE functions are enabled
+ */
+enum ethtool_c33_pse_admin_state {
+	ETHTOOL_C33_PSE_ADMIN_STATE_UNKNOWN = 1,
+	ETHTOOL_C33_PSE_ADMIN_STATE_DISABLED,
+	ETHTOOL_C33_PSE_ADMIN_STATE_ENABLED,
+};
+
+/**
+ * enum ethtool_c33_pse_pw_d_status - power detection status of the PSE.
+ *	IEEE 802.3-2022 30.9.1.1.3 aPoDLPSEPowerDetectionStatus:
+ * @ETHTOOL_C33_PSE_PW_D_STATUS_UNKNOWN: PSE status is unknown
+ * @ETHTOOL_C33_PSE_PW_D_STATUS_DISABLED: "The enumeration “disabled”
+ *	indicates that the PSE State diagram is in the state DISABLED."
+ * @ETHTOOL_C33_PSE_PW_D_STATUS_SEARCHING: "The enumeration “searching”
+ *	indicates the PSE State diagram is in a state other than those
+ *	listed."
+ * @ETHTOOL_C33_PSE_PW_D_STATUS_DELIVERING: "The enumeration
+ *	“deliveringPower” indicates that the PSE State diagram is in the
+ *	state POWER_ON."
+ * @ETHTOOL_C33_PSE_PW_D_STATUS_TEST: "The enumeration “test” indicates that
+ *	the PSE State diagram is in the state TEST_MODE."
+ * @ETHTOOL_C33_PSE_PW_D_STATUS_FAULT: "The enumeration “fault” indicates that
+ *	the PSE State diagram is in the state TEST_ERROR."
+ * @ETHTOOL_C33_PSE_PW_D_STATUS_OTHERFAULT: "The enumeration “otherFault”
+ *	indicates that the PSE State diagram is in the state IDLE due to
+ *	the variable error_condition = true."
+ */
+enum ethtool_c33_pse_pw_d_status {
+	ETHTOOL_C33_PSE_PW_D_STATUS_UNKNOWN = 1,
+	ETHTOOL_C33_PSE_PW_D_STATUS_DISABLED,
+	ETHTOOL_C33_PSE_PW_D_STATUS_SEARCHING,
+	ETHTOOL_C33_PSE_PW_D_STATUS_DELIVERING,
+	ETHTOOL_C33_PSE_PW_D_STATUS_TEST,
+	ETHTOOL_C33_PSE_PW_D_STATUS_FAULT,
+	ETHTOOL_C33_PSE_PW_D_STATUS_OTHERFAULT,
+};
+
 /**
  * enum ethtool_podl_pse_admin_state - operational state of the PoDL PSE
  *	functions. IEEE 802.3-2018 30.15.1.1.2 aPoDLPSEAdminState
diff --git a/include/uapi/linux/ethtool_netlink.h b/include/uapi/linux/ethtool_netlink.h
index 3f89074aa06c..3f32d360beb1 100644
--- a/include/uapi/linux/ethtool_netlink.h
+++ b/include/uapi/linux/ethtool_netlink.h
@@ -895,6 +895,9 @@ enum {
 	ETHTOOL_A_PODL_PSE_ADMIN_STATE,		/* u32 */
 	ETHTOOL_A_PODL_PSE_ADMIN_CONTROL,	/* u32 */
 	ETHTOOL_A_PODL_PSE_PW_D_STATUS,		/* u32 */
+	ETHTOOL_A_C33_PSE_ADMIN_STATE,		/* u32 */
+	ETHTOOL_A_C33_PSE_ADMIN_CONTROL,	/* u32 */
+	ETHTOOL_A_C33_PSE_PW_D_STATUS,		/* u32 */
 
 	/* add new constants above here */
 	__ETHTOOL_A_PSE_CNT,

-- 
2.25.1

[PATCH net-next v5 05/17] net: pse-pd: Introduce PSE types enumeration

[Kory Maincent]

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.

This patch is sponsored by Dent Project <dentproject@linuxfoundation.org>.

Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: Kory Maincent <kory.maincent@bootlin.com>
---

Changes in v2:
- Rename PSE_POE to PSE_C33 to have naming consistency.
- Use "static inline" instead of simple static in the header

Changes in v3:
- Move the pse_type enum in uapi.
- Replace pse_get_types helper by pse_has_podl and pse_has_c33.

Changes in v5:
- Move the pse types enum in ethtool.
- Add ethtool prefix to the value.
---
 drivers/net/pse-pd/pse_core.c      | 12 ++++++++++++
 drivers/net/pse-pd/pse_regulator.c |  1 +
 include/linux/pse-pd/pse.h         | 15 +++++++++++++++
 include/uapi/linux/ethtool.h       | 12 ++++++++++++
 4 files changed, 40 insertions(+)

diff --git a/drivers/net/pse-pd/pse_core.c b/drivers/net/pse-pd/pse_core.c
index 146b81f08a89..fed006cbc185 100644
--- a/drivers/net/pse-pd/pse_core.c
+++ b/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);
diff --git a/drivers/net/pse-pd/pse_regulator.c b/drivers/net/pse-pd/pse_regulator.c
index 1dedf4de296e..547af384764b 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 = ETHTOOL_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 be4e5754eb24..19589571157f 100644
--- a/include/linux/pse-pd/pse.h
+++ b/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
diff --git a/include/uapi/linux/ethtool.h b/include/uapi/linux/ethtool.h
index d35f044e88eb..f63fdeb422e8 100644
--- a/include/uapi/linux/ethtool.h
+++ b/include/uapi/linux/ethtool.h
@@ -752,6 +752,18 @@ enum ethtool_module_power_mode {
 	ETHTOOL_MODULE_POWER_MODE_HIGH,
 };
 
+/**
+ * enum - 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

-- 
2.25.1

[PATCH net-next v5 06/17] net: ethtool: pse-pd: Expand pse commands with the PSE PoE interface

[Kory Maincent]

Add PSE PoE interface support in the ethtool pse command.

This patch is sponsored by Dent Project <dentproject@linuxfoundation.org>.

Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: Kory Maincent <kory.maincent@bootlin.com>
---

Changes in v2:
- Follow the "c33" PoE prefix naming change.

Changes in v3:
- Replace the pse_get_types() helper by pse_has_podl() and pse_has_c33().
- Replace PoE to c33 in the netlink error log.
- Fix documentation build warning.
---
 Documentation/networking/ethtool-netlink.rst | 20 ++++++++++
 net/ethtool/pse-pd.c                         | 60 +++++++++++++++++++++++-----
 2 files changed, 70 insertions(+), 10 deletions(-)

diff --git a/Documentation/networking/ethtool-netlink.rst b/Documentation/networking/ethtool-netlink.rst
index d583d9abf2f8..294187c3a3b0 100644
--- a/Documentation/networking/ethtool-netlink.rst
+++ b/Documentation/networking/ethtool-netlink.rst
@@ -1717,6 +1717,10 @@ Kernel response contents:
                                                   PSE functions
   ``ETHTOOL_A_PODL_PSE_PW_D_STATUS``         u32  power detection status of the
                                                   PoDL PSE.
+  ``ETHTOOL_A_C33_PSE_ADMIN_STATE``          u32  Operational state of the PoE
+                                                  PSE functions.
+  ``ETHTOOL_A_C33_PSE_PW_D_STATUS``          u32  power detection status of the
+                                                  PoE PSE.
   ======================================  ======  =============================
 
 When set, the optional ``ETHTOOL_A_PODL_PSE_ADMIN_STATE`` attribute identifies
@@ -1728,6 +1732,12 @@ aPoDLPSEAdminState. Possible values are:
 .. kernel-doc:: include/uapi/linux/ethtool.h
     :identifiers: ethtool_podl_pse_admin_state
 
+The same goes for ``ETHTOOL_A_C33_PSE_ADMIN_STATE`` implementing
+``IEEE 802.3-2022`` 30.9.1.1.2 aPSEAdminState.
+
+.. kernel-doc:: include/uapi/linux/ethtool.h
+    :identifiers: ethtool_c33_pse_admin_state
+
 When set, the optional ``ETHTOOL_A_PODL_PSE_PW_D_STATUS`` attribute identifies
 the power detection status of the PoDL PSE.  The status depend on internal PSE
 state machine and automatic PD classification support. This option is
@@ -1737,6 +1747,12 @@ Possible values are:
 .. kernel-doc:: include/uapi/linux/ethtool.h
     :identifiers: ethtool_podl_pse_pw_d_status
 
+The same goes for ``ETHTOOL_A_C33_PSE_ADMIN_PW_D_STATUS`` implementing
+``IEEE 802.3-2022`` 30.9.1.1.5 aPSEPowerDetectionStatus.
+
+.. kernel-doc:: include/uapi/linux/ethtool.h
+    :identifiers: ethtool_c33_pse_pw_d_status
+
 PSE_SET
 =======
 
@@ -1747,6 +1763,7 @@ Request contents:
   ======================================  ======  =============================
   ``ETHTOOL_A_PSE_HEADER``                nested  request header
   ``ETHTOOL_A_PODL_PSE_ADMIN_CONTROL``       u32  Control PoDL PSE Admin state
+  ``ETHTOOL_A_C33_PSE_ADMIN_CONTROL``        u32  Control PSE Admin state
   ======================================  ======  =============================
 
 When set, the optional ``ETHTOOL_A_PODL_PSE_ADMIN_CONTROL`` attribute is used
@@ -1754,6 +1771,9 @@ to control PoDL PSE Admin functions. This option is implementing
 ``IEEE 802.3-2018`` 30.15.1.2.1 acPoDLPSEAdminControl. See
 ``ETHTOOL_A_PODL_PSE_ADMIN_STATE`` for supported values.
 
+The same goes for ``ETHTOOL_A_C33_PSE_ADMIN_CONTROL`` implementing
+``IEEE 802.3-2022`` 30.9.1.2.1 acPSEAdminControl.
+
 RSS_GET
 =======
 
diff --git a/net/ethtool/pse-pd.c b/net/ethtool/pse-pd.c
index aef57a058f0d..a3bfc3d9644e 100644
--- a/net/ethtool/pse-pd.c
+++ b/net/ethtool/pse-pd.c
@@ -82,6 +82,10 @@ static int pse_reply_size(const struct ethnl_req_info *req_base,
 		len += nla_total_size(sizeof(u32)); /* _PODL_PSE_ADMIN_STATE */
 	if (st->podl_pw_status > 0)
 		len += nla_total_size(sizeof(u32)); /* _PODL_PSE_PW_D_STATUS */
+	if (st->c33_admin_state > 0)
+		len += nla_total_size(sizeof(u32)); /* _C33_PSE_ADMIN_STATE */
+	if (st->c33_pw_status > 0)
+		len += nla_total_size(sizeof(u32)); /* _C33_PSE_PW_D_STATUS */
 
 	return len;
 }
@@ -103,6 +107,16 @@ static int pse_fill_reply(struct sk_buff *skb,
 			st->podl_pw_status))
 		return -EMSGSIZE;
 
+	if (st->c33_admin_state > 0 &&
+	    nla_put_u32(skb, ETHTOOL_A_C33_PSE_ADMIN_STATE,
+			st->c33_admin_state))
+		return -EMSGSIZE;
+
+	if (st->c33_pw_status > 0 &&
+	    nla_put_u32(skb, ETHTOOL_A_C33_PSE_PW_D_STATUS,
+			st->c33_pw_status))
+		return -EMSGSIZE;
+
 	return 0;
 }
 
@@ -113,25 +127,18 @@ const struct nla_policy ethnl_pse_set_policy[ETHTOOL_A_PSE_MAX + 1] = {
 	[ETHTOOL_A_PODL_PSE_ADMIN_CONTROL] =
 		NLA_POLICY_RANGE(NLA_U32, ETHTOOL_PODL_PSE_ADMIN_STATE_DISABLED,
 				 ETHTOOL_PODL_PSE_ADMIN_STATE_ENABLED),
+	[ETHTOOL_A_C33_PSE_ADMIN_CONTROL] =
+		NLA_POLICY_RANGE(NLA_U32, ETHTOOL_C33_PSE_ADMIN_STATE_DISABLED,
+				 ETHTOOL_C33_PSE_ADMIN_STATE_ENABLED),
 };
 
 static int
 ethnl_set_pse_validate(struct ethnl_req_info *req_info, struct genl_info *info)
-{
-	return !!info->attrs[ETHTOOL_A_PODL_PSE_ADMIN_CONTROL];
-}
-
-static int
-ethnl_set_pse(struct ethnl_req_info *req_info, struct genl_info *info)
 {
 	struct net_device *dev = req_info->dev;
-	struct pse_control_config config = {};
 	struct nlattr **tb = info->attrs;
 	struct phy_device *phydev;
 
-	/* this values are already validated by the ethnl_pse_set_policy */
-	config.podl_admin_control = nla_get_u32(tb[ETHTOOL_A_PODL_PSE_ADMIN_CONTROL]);
-
 	phydev = dev->phydev;
 	if (!phydev) {
 		NL_SET_ERR_MSG(info->extack, "No PHY is attached");
@@ -143,6 +150,39 @@ ethnl_set_pse(struct ethnl_req_info *req_info, struct genl_info *info)
 		return -EOPNOTSUPP;
 	}
 
+	if (tb[ETHTOOL_A_PODL_PSE_ADMIN_CONTROL] &&
+	    !(pse_has_podl(phydev->psec))) {
+		NL_SET_ERR_MSG_ATTR(info->extack,
+				    tb[ETHTOOL_A_PODL_PSE_ADMIN_CONTROL],
+				    "setting PoDL PSE admin control not supported");
+		return -EOPNOTSUPP;
+	}
+	if (tb[ETHTOOL_A_C33_PSE_ADMIN_CONTROL] &&
+	    !(pse_has_c33(phydev->psec))) {
+		NL_SET_ERR_MSG_ATTR(info->extack,
+				    tb[ETHTOOL_A_C33_PSE_ADMIN_CONTROL],
+				    "setting C33 PSE admin control not supported");
+		return -EOPNOTSUPP;
+	}
+
+	return 1;
+}
+
+static int
+ethnl_set_pse(struct ethnl_req_info *req_info, struct genl_info *info)
+{
+	struct net_device *dev = req_info->dev;
+	struct pse_control_config config = {};
+	struct nlattr **tb = info->attrs;
+	struct phy_device *phydev;
+
+	phydev = dev->phydev;
+	/* These values are already validated by the ethnl_pse_set_policy */
+	if (pse_has_podl(phydev->psec))
+		config.podl_admin_control = nla_get_u32(tb[ETHTOOL_A_PODL_PSE_ADMIN_CONTROL]);
+	if (pse_has_c33(phydev->psec))
+		config.c33_admin_control = nla_get_u32(tb[ETHTOOL_A_C33_PSE_ADMIN_CONTROL]);
+
 	/* Return errno directly - PSE has no notification */
 	return pse_ethtool_set_config(phydev->psec, info->extack, &config);
 }

-- 
2.25.1

[PATCH net-next v5 07/17] netlink: specs: Modify pse attribute prefix

[Kory Maincent]

Remove podl from the attribute prefix to prepare the support of PoE pse
netlink spec.

This patch is sponsored by Dent Project <dentproject@linuxfoundation.org>.

Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: Kory Maincent <kory.maincent@bootlin.com>
---

Changes in v2:
- Add the ethtool auto generated code.

Changes in v3:
- Remove the ethtool auto generated code.
---
 Documentation/netlink/specs/ethtool.yaml | 18 +++++++++---------
 1 file changed, 9 insertions(+), 9 deletions(-)

diff --git a/Documentation/netlink/specs/ethtool.yaml b/Documentation/netlink/specs/ethtool.yaml
index 197208f419dc..33e81fa189ca 100644
--- a/Documentation/netlink/specs/ethtool.yaml
+++ b/Documentation/netlink/specs/ethtool.yaml
@@ -878,17 +878,17 @@ attribute-sets:
         type: nest
         nested-attributes: header
       -
-        name: admin-state
+        name: podl-pse-admin-state
         type: u32
-        name-prefix: ethtool-a-podl-pse-
+        name-prefix: ethtool-a-
       -
-        name: admin-control
+        name: podl-pse-admin-control
         type: u32
-        name-prefix: ethtool-a-podl-pse-
+        name-prefix: ethtool-a-
       -
-        name: pw-d-status
+        name: podl-pse-pw-d-status
         type: u32
-        name-prefix: ethtool-a-podl-pse-
+        name-prefix: ethtool-a-
   -
     name: rss
     attributes:
@@ -1571,9 +1571,9 @@ operations:
         reply:
           attributes: &pse
             - header
-            - admin-state
-            - admin-control
-            - pw-d-status
+            - podl-pse-admin-state
+            - podl-pse-admin-control
+            - podl-pse-pw-d-status
       dump: *pse-get-op
     -
       name: pse-set

-- 
2.25.1

[PATCH net-next v5 08/17] netlink: specs: Expand the pse netlink command with PoE interface

[Kory Maincent]

Add the PoE pse attributes prefix to be able to use PoE interface.

Example usage:
./ynl/cli.py --spec netlink/specs/ethtool.yaml --no-schema --do pse-get \
             --json '{"header":{"dev-name":"eth0"}}'
{'header': {'dev-index': 4, 'dev-name': 'eth0'},
 'c33-pse-admin-state': 3,
 'c33-pse-pw-d-status': 4}

./ynl/cli.py --spec netlink/specs/ethtool.yaml --no-schema --do pse-set \
             --json '{"header":{"dev-name":"eth0"},
		     "c33-pse-admin-control":3}'

This patch is sponsored by Dent Project <dentproject@linuxfoundation.org>.

Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: Kory Maincent <kory.maincent@bootlin.com>
---

Changes in v2:
- Follow the "c33" PoE prefix naming change.
- Add the ethtool auto generated code.

Changes in v3:
- Remove the ethtool auto generated code.
---
 Documentation/netlink/specs/ethtool.yaml | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/Documentation/netlink/specs/ethtool.yaml b/Documentation/netlink/specs/ethtool.yaml
index 33e81fa189ca..beaab9f0017f 100644
--- a/Documentation/netlink/specs/ethtool.yaml
+++ b/Documentation/netlink/specs/ethtool.yaml
@@ -889,6 +889,18 @@ attribute-sets:
         name: podl-pse-pw-d-status
         type: u32
         name-prefix: ethtool-a-
+      -
+        name: c33-pse-admin-state
+        type: u32
+        name-prefix: ethtool-a-
+      -
+        name: c33-pse-admin-control
+        type: u32
+        name-prefix: ethtool-a-
+      -
+        name: c33-pse-pw-d-status
+        type: u32
+        name-prefix: ethtool-a-
   -
     name: rss
     attributes:
@@ -1574,6 +1586,9 @@ operations:
             - podl-pse-admin-state
             - podl-pse-admin-control
             - podl-pse-pw-d-status
+            - c33-pse-admin-state
+            - c33-pse-admin-control
+            - c33-pse-pw-d-status
       dump: *pse-get-op
     -
       name: pse-set

-- 
2.25.1

[PATCH net-next v5 09/17] MAINTAINERS: Add myself to pse networking maintainer

[Kory Maincent]

As I add support for PoE in PSE networking subsystem it seems legitimate
to be added to the maintainers.

This patch is sponsored by Dent Project <dentproject@linuxfoundation.org>.

Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: Kory Maincent <kory.maincent@bootlin.com>
---

Changes in v3:
- New patch
---
 MAINTAINERS | 1 +
 1 file changed, 1 insertion(+)

diff --git a/MAINTAINERS b/MAINTAINERS
index 4f9b554f79da..43d26b766936 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -17692,6 +17692,7 @@ F:	net/psample
 
 PSE NETWORK DRIVER
 M:	Oleksij Rempel <o.rempel@pengutronix.de>
+M:	Kory Maincent <kory.maincent@bootlin.com>
 L:	netdev@vger.kernel.org
 S:	Maintained
 F:	Documentation/devicetree/bindings/net/pse-pd/

-- 
2.25.1

[PATCH net-next v5 10/17] net: pse-pd: Add support for PSE PIs

[Kory Maincent]

Add support for getting the PSE controller node through PSE PI device
subnode.
This supports adds a way to get the PSE PI id from the pse_pi devicetree
subnode of a PSE controller node simply by reading the reg property.

This patch is sponsored by Dent Project <dentproject@linuxfoundation.org>.

Signed-off-by: Kory Maincent <kory.maincent@bootlin.com>
---

Changes in v3:
- New patch.

Changes in v4:
- Add PSE PI documentation.

Changes in v5:
- Update PSE PI documentation.
---
 Documentation/networking/pse-pd/index.rst  |   1 +
 Documentation/networking/pse-pd/pse-pi.rst | 302 +++++++++++++++++++++++++++++
 drivers/net/pse-pd/pse_core.c              | 223 +++++++++++++++++----
 include/linux/pse-pd/pse.h                 |  38 +++-
 4 files changed, 520 insertions(+), 44 deletions(-)

diff --git a/Documentation/networking/pse-pd/index.rst b/Documentation/networking/pse-pd/index.rst
index 18197bc7303d..de28a5aee316 100644
--- a/Documentation/networking/pse-pd/index.rst
+++ b/Documentation/networking/pse-pd/index.rst
@@ -7,3 +7,4 @@ Power Sourcing Equipment (PSE) Documentation
    :maxdepth: 2
 
    introduction
+   pse-pi
diff --git a/Documentation/networking/pse-pd/pse-pi.rst b/Documentation/networking/pse-pd/pse-pi.rst
new file mode 100644
index 000000000000..c4a50c670d9c
--- /dev/null
+++ b/Documentation/networking/pse-pd/pse-pi.rst
@@ -0,0 +1,302 @@
+.. SPDX-License-Identifier: GPL-2.0
+
+PSE Power Interface (PSE PI) Documentation
+==========================================
+
+The Power Sourcing Equipment Power Interface (PSE PI) plays a pivotal role in
+the architecture of Power over Ethernet (PoE) systems. It is essentially a
+blueprint that outlines how one or multiple power sources are connected to the
+eight-pin modular jack, commonly known as the Ethernet RJ45 port. This
+connection scheme is crucial for enabling the delivery of power alongside data
+over Ethernet cables.
+
+Documentation and Standards
+---------------------------
+
+The IEEE 802.3 standard provides detailed documentation on the PSE PI.
+Specifically:
+
+- Section "33.2.3 PI pin assignments" covers the pin assignments for PoE
+  systems that utilize two pairs for power delivery.
+- Section "145.2.4 PSE PI" addresses the configuration for PoE systems that
+  deliver power over all four pairs of an Ethernet cable.
+
+PSE PI and Single Pair Ethernet
+-------------------------------
+
+Single Pair Ethernet (SPE) represents a different approach to Ethernet
+connectivity, utilizing just one pair of conductors for both data and power
+transmission. Unlike the configurations detailed in the PSE PI for standard
+Ethernet, which can involve multiple power sourcing arrangements across four or
+two pairs of wires, SPE operates on a simpler model due to its single-pair
+design. As a result, the complexities of choosing between alternative pin
+assignments for power delivery, as described in the PSE PI for multi-pair
+Ethernet, are not applicable to SPE.
+
+Understanding PSE PI
+--------------------
+
+The Power Sourcing Equipment Power Interface (PSE PI) is a framework defining
+how Power Sourcing Equipment (PSE) delivers power to Powered Devices (PDs) over
+Ethernet cables. It details two main configurations for power delivery, known
+as Alternative A and Alternative B, which are distinguished not only by their
+method of power transmission but also by the implications for polarity and data
+transmission direction.
+
+Alternative A and B Overview
+----------------------------
+
+- **Alternative A:** Utilizes RJ45 conductors 1, 2, 3 and 6. In either case of
+  networks 10/100BaseT or 1G/2G/5G/10GBaseT, the pairs used are carrying data.
+  The power delivery's polarity in this alternative can vary based on the MDI
+  (Medium Dependent Interface) or MDI-X (Medium Dependent Interface Crossover)
+  configuration.
+
+- **Alternative B:** Utilizes RJ45 conductors 4, 5, 7 and 8. In case of
+  10/100BaseT network the pairs used are spare pairs without data and are less
+  influenced by data transmission direction. This is not the case for
+  1G/2G/5G/10GBaseT network. Alternative B includes two configurations with
+  different polarities, known as variant X and variant S, to accommodate
+  different network requirements and device specifications.
+
+Table 145–3—PSE Pinout Alternatives
+-----------------------------------
+
+The following table outlines the pin configurations for both Alternative A and
+Alternative B.
+
++------------+-------------------+-----------------+-----------------+-----------------+
+| Conductor  | Alternative A     | Alternative A   | Alternative B   | Alternative B   |
+|            |    (MDI-X)        |      (MDI)      |        (X)      |        (S)      |
++============+===================+=================+=================+=================+
+| 1          | Negative V        | Positive V      | -               | -               |
++------------+-------------------+-----------------+-----------------+-----------------+
+| 2          | Negative V        | Positive V      | -               | -               |
++------------+-------------------+-----------------+-----------------+-----------------+
+| 3          | Positive V        | Negative V      | -               | -               |
++------------+-------------------+-----------------+-----------------+-----------------+
+| 4          | -                 | -               | Negative V      | Positive V      |
++------------+-------------------+-----------------+-----------------+-----------------+
+| 5          | -                 | -               | Negative V      | Positive V      |
++------------+-------------------+-----------------+-----------------+-----------------+
+| 6          | Positive V        | Negative V      | -               | -               |
++------------+-------------------+-----------------+-----------------+-----------------+
+| 7          | -                 | -               | Positive V      | Negative V      |
++------------+-------------------+-----------------+-----------------+-----------------+
+| 8          | -                 | -               | Positive V      | Negative V      |
++------------+-------------------+-----------------+-----------------+-----------------+
+
+.. note::
+    - "Positive V" and "Negative V" indicate the voltage polarity for each pin.
+    - "-" indicates that the pin is not used for power delivery in that
+      specific configuration.
+
+PSE PI compatibilities
+----------------------
+
+The following table outlines the compatibility between the pinout alternative
+and the 1000/2.5G/5G/10GBaseT in the PSE 2 pairs connection.
+
++---------+---------------+---------------------+-----------------------+
+| Variant | Alternative   | Power Feeding Type  | Compatibility with    |
+|         | (A/B)         | (Direct/Phantom)    | 1000/2.5G/5G/10GBaseT |
++=========+===============+=====================+=======================+
+| 1       | A             | Phantom             | Yes                   |
++---------+---------------+---------------------+-----------------------+
+| 2       | B             | Phantom             | Yes                   |
++---------+---------------+---------------------+-----------------------+
+| 3       | B             | Direct              | No                    |
++---------+---------------+---------------------+-----------------------+
+
+.. note::
+    - "Direct" indicate a variant where the power is injected directly to pairs
+       without using magnetics in case of spare pairs.
+    - "Phantom" indicate power path over coils/magnetics as it is done for
+       Alternative A variant.
+
+In case of PSE 4 pairs, a PSE supporting only 10/100BaseT (which mean Direct
+Power on pinout Alternative B) is not compatible with a 4 pairs
+1000/2.5G/5G/10GBaseT.
+
+PSE Power Interface (PSE PI) Connection Diagram
+-----------------------------------------------
+
+The diagram below illustrates the connection architecture between the RJ45
+port, the Ethernet PHY (Physical Layer), and the PSE PI (Power Sourcing
+Equipment Power Interface), demonstrating how power and data are delivered
+simultaneously through an Ethernet cable. The RJ45 port serves as the physical
+interface for these connections, with each of its eight pins connected to both
+the Ethernet PHY for data transmission and the PSE PI for power delivery.
+
+.. code-block::
+
+    +--------------------------+
+    |                          |
+    |          RJ45 Port       |
+    |                          |
+    +--+--+--+--+--+--+--+--+--+                +-------------+
+      1| 2| 3| 4| 5| 6| 7| 8|                   |             |
+       |  |  |  |  |  |  |  o-------------------+             |
+       |  |  |  |  |  |  o--|-------------------+             +<--- PSE 1
+       |  |  |  |  |  o--|--|-------------------+             |
+       |  |  |  |  o--|--|--|-------------------+             |
+       |  |  |  o--|--|--|--|-------------------+  PSE PI     |
+       |  |  o--|--|--|--|--|-------------------+             |
+       |  o--|--|--|--|--|--|-------------------+             +<--- PSE 2 (optional)
+       o--|--|--|--|--|--|--|-------------------+             |
+       |  |  |  |  |  |  |  |                   |             |
+    +--+--+--+--+--+--+--+--+--+                +-------------+
+    |                          |
+    |       Ethernet PHY       |
+    |                          |
+    +--------------------------+
+
+Simple PSE PI Configuration for Alternative A
+---------------------------------------------
+
+The diagram below illustrates a straightforward PSE PI (Power Sourcing
+Equipment Power Interface) configuration designed to support the Alternative A
+setup for Power over Ethernet (PoE). This implementation is tailored to provide
+power delivery through the data-carrying pairs of an Ethernet cable, suitable
+for either MDI or MDI-X configurations, albeit supporting one variation at a
+time.
+
+.. code-block::
+
+         +-------------+
+         |    PSE PI   |
+ 8  -----+                             +-------------+
+ 7  -----+                    Rail 1   |
+ 6  -----+------+----------------------+
+ 5  -----+      |                      |
+ 4  -----+     /              Rail 2   |  PSE 1
+ 3  -----+----´          +-------------+
+ 2  -----+----+---------´              |
+ 1  -----+---´                         +-------------+
+         |
+         +-------------+
+
+In this configuration:
+
+- Pins 1 and 2, as well as pins 3 and 6, are utilized for power delivery in
+  addition to data transmission. This aligns with the standard wiring for
+  10/100BaseT Ethernet networks where these pairs are used for data.
+- Rail 1 and Rail 2 represent the positive and negative voltage rails, with
+  Rail 1 connected to pins 1 and 2, and Rail 2 connected to pins 3 and 6.
+  More advanced PSE PI configurations may include integrated or external
+  switches to change the polarity of the voltage rails, allowing for
+  compatibility with both MDI and MDI-X configurations.
+
+More complex PSE PI configurations may include additional components, to support
+Alternative B, or to provide additional features such as power management, or
+additional power delivery capabilities such as 2-pair or 4-pair power delivery.
+
+.. code-block::
+
+         +-------------+
+         |    PSE PI   |
+         |        +---+
+ 8  -----+--------+   |                 +-------------+
+ 7  -----+--------+   |       Rail 1   |
+ 6  -----+--------+   +-----------------+
+ 5  -----+--------+   |                |
+ 4  -----+--------+   |       Rail 2   |  PSE 1
+ 3  -----+--------+   +----------------+
+ 2  -----+--------+   |                |
+ 1  -----+--------+   |                 +-------------+
+         |        +---+
+         +-------------+
+
+Device Tree Configuration: Describing PSE PI Configurations
+-----------------------------------------------------------
+
+The necessity for a separate PSE PI node in the device tree is influenced by
+the intricacy of the Power over Ethernet (PoE) system's setup. Here are
+descriptions of both simple and complex PSE PI configurations to illustrate
+this decision-making process:
+
+**Simple PSE PI Configuration:**
+In a straightforward scenario, the PSE PI setup involves a direct, one-to-one
+connection between a single PSE controller and an Ethernet port. This setup
+typically supports basic PoE functionality without the need for dynamic
+configuration or management of multiple power delivery modes. For such simple
+configurations, detailing the PSE PI within the existing PSE controller's node
+may suffice, as the system does not encompass additional complexity that
+warrants a separate node. The primary focus here is on the clear and direct
+association of power delivery to a specific Ethernet port.
+
+**Complex PSE PI Configuration:**
+Contrastingly, a complex PSE PI setup may encompass multiple PSE controllers or
+auxiliary circuits that collectively manage power delivery to one Ethernet
+port. Such configurations might support a range of PoE standards and require
+the capability to dynamically configure power delivery based on the operational
+mode (e.g., PoE2 versus PoE4) or specific requirements of connected devices. In
+these instances, a dedicated PSE PI node becomes essential for accurately
+documenting the system architecture. This node would serve to detail the
+interactions between different PSE controllers, the support for various PoE
+modes, and any additional logic required to coordinate power delivery across
+the network infrastructure.
+
+**Guidance:**
+
+For simple PSE setups, including PSE PI information in the PSE controller node
+might suffice due to the straightforward nature of these systems. However,
+complex configurations, involving multiple components or advanced PoE features,
+benefit from a dedicated PSE PI node. This method adheres to IEEE 802.3
+specifications, improving documentation clarity and ensuring accurate
+representation of the PoE system's complexity.
+
+PSE PI Node: Essential Information
+----------------------------------
+
+The PSE PI (Power Sourcing Equipment Power Interface) node in a device tree can
+include several key pieces of information critical for defining the power
+delivery capabilities and configurations of a PoE (Power over Ethernet) system.
+Below is a list of such information, along with explanations for their
+necessity and reasons why they might not be found within a PSE controller node:
+
+1. **Powered Pairs Configuration**
+
+   - *Description:* Identifies the pairs used for power delivery in the
+     Ethernet cable.
+   - *Necessity:* Essential to ensure the correct pairs are powered according
+     to the board's design.
+   - *PSE Controller Node:* Typically lacks details on physical pair usage,
+     focusing on power regulation.
+
+2. **Polarity of Powered Pairs**
+
+   - *Description:* Specifies the polarity (positive or negative) for each
+     powered pair.
+   - *Necessity:* Critical for safe and effective power transmission to PDs.
+   - *PSE Controller Node:* Polarity management may exceed the standard
+     functionalities of PSE controllers.
+
+3. **PSE Cells Association**
+
+   - *Description:* Details the association of PSE cells with Ethernet ports or
+     pairs in multi-cell configurations.
+   - *Necessity:* Allows for optimized power resource allocation in complex
+     systems.
+   - *PSE Controller Node:* Controllers may not manage cell associations
+     directly, focusing instead on power flow regulation.
+
+4. **Support for PoE Standards**
+
+   - *Description:* Lists the PoE standards and configurations supported by the
+     system.
+   - *Necessity:* Ensures system compatibility with various PDs and adherence
+     to industry standards.
+   - *PSE Controller Node:* Specific capabilities may depend on the overall PSE
+     PI design rather than the controller alone. Multiple PSE cells per PI
+     do not necessarily imply support for multiple PoE standards.
+
+5. **Protection Mechanisms**
+
+   - *Description:* Outlines additional protection mechanisms, such as
+     overcurrent protection and thermal management.
+   - *Necessity:* Provides extra safety and stability, complementing PSE
+     controller protections.
+   - *PSE Controller Node:* Some protections may be implemented via
+     board-specific hardware or algorithms external to the controller.
+
diff --git a/drivers/net/pse-pd/pse_core.c b/drivers/net/pse-pd/pse_core.c
index fed006cbc185..9124eb3d6492 100644
--- a/drivers/net/pse-pd/pse_core.c
+++ b/drivers/net/pse-pd/pse_core.c
@@ -27,38 +27,137 @@ struct pse_control {
 	struct kref refcnt;
 };
 
-/**
- * of_pse_zero_xlate - dummy function for controllers with one only control
- * @pcdev: a pointer to the PSE controller device
- * @pse_spec: PSE line specifier as found in the device tree
- *
- * This static translation function is used by default if of_xlate in
- * :c:type:`pse_controller_dev` is not set. It is useful for all PSE
- * controllers with #pse-cells = <0>.
- */
-static int of_pse_zero_xlate(struct pse_controller_dev *pcdev,
-			     const struct of_phandle_args *pse_spec)
+static int of_load_pse_pi_pairsets(struct device_node *node,
+				   struct pse_pi *pi,
+				   int npairsets)
 {
-	return 0;
+	struct device_node *pairset_np;
+	const char *name;
+	int i, ret;
+
+	for (i = 0; i < npairsets; i++) {
+		ret = of_property_read_string_index(node,
+						    "pairset-names",
+						     i, &name);
+		if (ret)
+			break;
+
+		if (strcmp(name, "alternative-a")) {
+			pi->pairset[i].pinout = ALTERNATIVE_A;
+		} else if (strcmp(name, "alternative-b")) {
+			pi->pairset[i].pinout = ALTERNATIVE_B;
+		} else {
+			pr_err("pse: wrong pairset-names value %s\n", name);
+			ret = -EINVAL;
+			break;
+		}
+
+		pairset_np = of_parse_phandle(node, "pairsets", i);
+		if (!pairset_np) {
+			ret = -ENODEV;
+			break;
+		}
+
+		pi->pairset[i].np = pairset_np;
+	}
+
+	if (i == 2 && pi->pairset[0].pinout == pi->pairset[1].pinout) {
+		pr_err("pse: two PI pairsets can not have identical pinout");
+		ret = -EINVAL;
+	}
+
+	/* If an error appears on the second pairset load, release the first
+	 * pairset device node kref
+	 */
+	if (ret) {
+		of_node_put(pi->pairset[0].np);
+		pi->pairset[0].np = NULL;
+		of_node_put(pi->pairset[1].np);
+		pi->pairset[1].np = NULL;
+	}
+
+	return ret;
 }
 
-/**
- * of_pse_simple_xlate - translate pse_spec to the PSE line number
- * @pcdev: a pointer to the PSE controller device
- * @pse_spec: PSE line specifier as found in the device tree
- *
- * This static translation function is used by default if of_xlate in
- * :c:type:`pse_controller_dev` is not set. It is useful for all PSE
- * controllers with 1:1 mapping, where PSE lines can be indexed by number
- * without gaps.
- */
-static int of_pse_simple_xlate(struct pse_controller_dev *pcdev,
-			       const struct of_phandle_args *pse_spec)
+static int of_load_pse_pis(struct pse_controller_dev *pcdev)
 {
-	if (pse_spec->args[0] >= pcdev->nr_lines)
-		return -EINVAL;
+	struct device_node *np = pcdev->dev->of_node;
+	struct device_node *node, *pis;
+	int ret, i;
 
-	return pse_spec->args[0];
+	if (!np)
+		return -ENODEV;
+
+	pcdev->pi = kcalloc(pcdev->nr_lines, sizeof(*pcdev->pi), GFP_KERNEL);
+	if (!pcdev->pi)
+		return -ENOMEM;
+
+	pis = of_get_child_by_name(np, "pse-pis");
+	if (!pis) {
+		/* Legacy OF description of PSE PIs */
+		pcdev->of_legacy = true;
+		return 0;
+	}
+
+	for_each_child_of_node(pis, node) {
+		struct pse_pi pi = {0};
+		int npairsets;
+		u32 id;
+
+		if (!of_node_name_eq(node, "pse-pi"))
+			continue;
+
+		ret = of_property_read_u32(node, "reg", &id);
+		if (ret)
+			goto out;
+
+		if (id >= pcdev->nr_lines || pcdev->pi[id].np) {
+			dev_err(pcdev->dev, "wrong id of pse pi: %u\n",
+				id);
+			ret = -EINVAL;
+			goto out;
+		}
+
+		ret = of_property_count_strings(node, "pairset-names");
+		if (ret <= 0)
+			goto out;
+		npairsets = ret;
+
+		ret = of_count_phandle_with_args(node, "pairsets", NULL);
+		if (ret <= 0)
+			goto out;
+
+		/* npairsets is limited to value one or two */
+		if (ret != npairsets || ret > 2) {
+			dev_err(pcdev->dev,
+				"wrong number of pairsets or pairset-names for pse pi %d\n",
+				id);
+			ret = -EINVAL;
+			goto out;
+		}
+
+		ret = of_load_pse_pi_pairsets(node, &pi, npairsets);
+		if (ret)
+			goto out;
+
+		of_node_get(node);
+		pi.np = node;
+		memcpy(&pcdev->pi[id], &pi, sizeof(pi));
+	}
+
+	of_node_put(pis);
+	return 0;
+
+out:
+	for (i = 0; i <= pcdev->nr_lines; i++) {
+		of_node_put(pcdev->pi[i].pairset[0].np);
+		of_node_put(pcdev->pi[i].pairset[1].np);
+		of_node_put(pcdev->pi[i].np);
+	}
+	of_node_put(node);
+	of_node_put(pis);
+	kfree(pcdev->pi);
+	return ret;
 }
 
 /**
@@ -67,16 +166,18 @@ static int of_pse_simple_xlate(struct pse_controller_dev *pcdev,
  */
 int pse_controller_register(struct pse_controller_dev *pcdev)
 {
-	if (!pcdev->of_xlate) {
-		if (pcdev->of_pse_n_cells == 0)
-			pcdev->of_xlate = of_pse_zero_xlate;
-		else if (pcdev->of_pse_n_cells == 1)
-			pcdev->of_xlate = of_pse_simple_xlate;
-	}
+	int ret;
 
 	mutex_init(&pcdev->lock);
 	INIT_LIST_HEAD(&pcdev->pse_control_head);
 
+	if (!pcdev->nr_lines)
+		pcdev->nr_lines = 1;
+
+	ret = of_load_pse_pis(pcdev);
+	if (ret)
+		return ret;
+
 	mutex_lock(&pse_list_mutex);
 	list_add(&pcdev->list, &pse_controller_list);
 	mutex_unlock(&pse_list_mutex);
@@ -91,6 +192,14 @@ EXPORT_SYMBOL_GPL(pse_controller_register);
  */
 void pse_controller_unregister(struct pse_controller_dev *pcdev)
 {
+	int i;
+
+	for (i = 0; i <= pcdev->nr_lines; i++) {
+		of_node_put(pcdev->pi[i].pairset[0].np);
+		of_node_put(pcdev->pi[i].pairset[1].np);
+		of_node_put(pcdev->pi[i].np);
+	}
+	kfree(pcdev->pi);
 	mutex_lock(&pse_list_mutex);
 	list_del(&pcdev->list);
 	mutex_unlock(&pse_list_mutex);
@@ -203,8 +312,33 @@ pse_control_get_internal(struct pse_controller_dev *pcdev, unsigned int index)
 	return psec;
 }
 
-struct pse_control *
-of_pse_control_get(struct device_node *node)
+static int of_pse_match_pi(struct pse_controller_dev *pcdev,
+			   struct device_node *np)
+{
+	int i;
+
+	for (i = 0; i <= pcdev->nr_lines; i++) {
+		if (pcdev->pi[i].np == np)
+			return i;
+	}
+
+	return -EINVAL;
+}
+
+static int psec_id_legacy_xlate(struct pse_controller_dev *pcdev,
+				const struct of_phandle_args *pse_spec)
+{
+	if (!pcdev->of_pse_n_cells)
+		return 0;
+
+	if (pcdev->of_pse_n_cells > 1 ||
+	    pse_spec->args[0] >= pcdev->nr_lines)
+		return -EINVAL;
+
+	return pse_spec->args[0];
+}
+
+struct pse_control *of_pse_control_get(struct device_node *node)
 {
 	struct pse_controller_dev *r, *pcdev;
 	struct of_phandle_args args;
@@ -222,7 +356,14 @@ of_pse_control_get(struct device_node *node)
 	mutex_lock(&pse_list_mutex);
 	pcdev = NULL;
 	list_for_each_entry(r, &pse_controller_list, list) {
-		if (args.np == r->dev->of_node) {
+		if (!r->of_legacy) {
+			ret = of_pse_match_pi(r, args.np);
+			if (ret >= 0) {
+				pcdev = r;
+				psec_id = ret;
+				break;
+			}
+		} else if (args.np == r->dev->of_node) {
 			pcdev = r;
 			break;
 		}
@@ -238,10 +379,12 @@ of_pse_control_get(struct device_node *node)
 		goto out;
 	}
 
-	psec_id = pcdev->of_xlate(pcdev, &args);
-	if (psec_id < 0) {
-		psec = ERR_PTR(psec_id);
-		goto out;
+	if (pcdev->of_legacy) {
+		psec_id = psec_id_legacy_xlate(pcdev, &args);
+		if (psec_id < 0) {
+			psec = ERR_PTR(psec_id);
+			goto out;
+		}
 	}
 
 	/* pse_list_mutex also protects the pcdev's pse_control list */
diff --git a/include/linux/pse-pd/pse.h b/include/linux/pse-pd/pse.h
index 19589571157f..01b3b9adfe2a 100644
--- a/include/linux/pse-pd/pse.h
+++ b/include/linux/pse-pd/pse.h
@@ -64,6 +64,36 @@ struct device_node;
 struct of_phandle_args;
 struct pse_control;
 
+/* PSE PI pairset pinout can either be Alternative A or Alternative B */
+enum pse_pi_pairset_pinout {
+	ALTERNATIVE_A,
+	ALTERNATIVE_B,
+};
+
+/**
+ * struct pse_pi_pairset - PSE PI pairset entity describing the pinout
+ *			   alternative ant its phandle
+ *
+ * @pinout: description of the pinout alternative
+ * @np: device node pointer describing the pairset phandle
+ */
+struct pse_pi_pairset {
+	enum pse_pi_pairset_pinout pinout;
+	struct device_node *np;
+};
+
+/**
+ * struct pse_pi - PSE PI (Power Interface) entity as described in
+ *		   IEEE 802.3-2022 145.2.4
+ *
+ * @pairset: table of the PSE PI pinout alternative for the two pairset
+ * @np: device node pointer of the PSE PI node
+ */
+struct pse_pi {
+	struct pse_pi_pairset pairset[2];
+	struct device_node *np;
+};
+
 /**
  * struct pse_controller_dev - PSE controller entity that might
  *                             provide multiple PSE controls
@@ -73,11 +103,11 @@ struct pse_control;
  * @pse_control_head: head of internal list of requested PSE controls
  * @dev: corresponding driver model device struct
  * @of_pse_n_cells: number of cells in PSE line specifiers
- * @of_xlate: translation function to translate from specifier as found in the
- *            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
+ * @pi: table of PSE PIs described in this controller device
+ * @of_legacy: flag set if the pse_pis devicetree node is not used
  */
 struct pse_controller_dev {
 	const struct pse_controller_ops *ops;
@@ -86,11 +116,11 @@ struct pse_controller_dev {
 	struct list_head pse_control_head;
 	struct device *dev;
 	int of_pse_n_cells;
-	int (*of_xlate)(struct pse_controller_dev *pcdev,
-			const struct of_phandle_args *pse_spec);
 	unsigned int nr_lines;
 	struct mutex lock;
 	enum ethtool_pse_types types;
+	struct pse_pi *pi;
+	bool of_legacy;
 };
 
 #if IS_ENABLED(CONFIG_PSE_CONTROLLER)

-- 
2.25.1

[PATCH net-next v5 11/17] dt-bindings: net: pse-pd: Add another way of describing several PSE PIs

[Kory Maincent]

PSE PI setup may encompass multiple PSE controllers or auxiliary circuits
that collectively manage power delivery to one Ethernet port.
Such configurations might support a range of PoE standards and require
the capability to dynamically configure power delivery based on the
operational mode (e.g., PoE2 versus PoE4) or specific requirements of
connected devices. In these instances, a dedicated PSE PI node becomes
essential for accurately documenting the system architecture. This node
would serve to detail the interactions between different PSE controllers,
the support for various PoE modes, and any additional logic required to
coordinate power delivery across the network infrastructure.

The old usage of "#pse-cells" is unsuficient as it carries only the PSE PI
index information.

This patch is sponsored by Dent Project <dentproject@linuxfoundation.org>.

Signed-off-by: Kory Maincent <kory.maincent@bootlin.com>
---

Changes in v3:
- New patch

Changes in v4:
- Remove $def
- Fix pairset-names item list
- Upgrade few properties description
- Update the commit message

Changes in v5:
- Fix yamllint error.
- Replace underscore by dash in properties names.
- Add polarity-supported property.
---
 .../bindings/net/pse-pd/pse-controller.yaml        | 100 ++++++++++++++++++++-
 1 file changed, 97 insertions(+), 3 deletions(-)

diff --git a/Documentation/devicetree/bindings/net/pse-pd/pse-controller.yaml b/Documentation/devicetree/bindings/net/pse-pd/pse-controller.yaml
index 2d382faca0e6..76a301463b48 100644
--- a/Documentation/devicetree/bindings/net/pse-pd/pse-controller.yaml
+++ b/Documentation/devicetree/bindings/net/pse-pd/pse-controller.yaml
@@ -13,6 +13,7 @@ description: Binding for the Power Sourcing Equipment (PSE) as defined in the
 
 maintainers:
   - Oleksij Rempel <o.rempel@pengutronix.de>
+  - Kory Maincent <kory.maincent@bootlin.com>
 
 properties:
   $nodename:
@@ -22,11 +23,104 @@ properties:
     description:
       Used to uniquely identify a PSE instance within an IC. Will be
       0 on PSE nodes with only a single output and at least 1 on nodes
-      controlling several outputs.
+      controlling several outputs which are not described in the pse-pis
+      subnode. This property is deprecated, please use pse-pis instead.
     enum: [0, 1]
 
-required:
-  - "#pse-cells"
+  pse-pis:
+    type: object
+    description:
+      Overview of the PSE PIs provided by the controller.
+
+    properties:
+      "#address-cells":
+        const: 1
+
+      "#size-cells":
+        const: 0
+
+    required:
+      - "#address-cells"
+      - "#size-cells"
+
+    patternProperties:
+      "^pse-pi@[0-9a-f]+$":
+        type: object
+        description:
+          PSE PI for power delivery via pairsets, compliant with IEEE
+          802.3-2022, Section 145.2.4. Each pairset comprises a positive and
+          a negative VPSE pair, adhering to the pinout configurations
+          detailed in the standard.
+          See Documentation/networking/pse-pd/pse-pi.rst for details.
+
+        properties:
+          reg:
+            description:
+              Address describing the PSE PI index.
+            maxItems: 1
+
+          "#pse-cells":
+            const: 0
+
+          pairset-names:
+            $ref: /schemas/types.yaml#/definitions/string-array
+            description:
+              Names of the pairsets as per IEEE 802.3-2022, Section 145.2.4.
+              Valid values are "alternative-a" and "alternative-b". Each name
+              should correspond to a phandle in the 'pairset' property
+              pointing to the power supply for that pairset.
+            minItems: 1
+            maxItems: 2
+            items:
+              enum:
+                - alternative-a
+                - alternative-b
+
+          pairsets:
+            $ref: /schemas/types.yaml#/definitions/phandle-array
+            description:
+              List of phandles, each pointing to the power supply for the
+              corresponding pairset named in 'pairset-names'. This property
+              aligns with IEEE 802.3-2022, Section 33.2.3 and 145.2.4.
+              PSE Pinout Alternatives (as per IEEE 802.3-2022 Table 145–3)
+              | Conductor | Alternative A (MDI-X) | Alternative A (MDI) | Alternative B(X) | Alternative B(S) |
+              |-----------|-----------------------|---------------------|------------------|------------------|
+              | 1         | Negative VPSE         | Positive VPSE       | —                | —                |
+              | 2         | Negative VPSE         | Positive VPSE       | —                | —                |
+              | 3         | Positive VPSE         | Negative VPSE       | —                | —                |
+              | 4         | —                     | —                   | Negative VPSE    | Positive VPSE    |
+              | 5         | —                     | —                   | Negative VPSE    | Positive VPSE    |
+              | 6         | Positive VPSE         | Negative VPSE       | —                | —                |
+              | 7         | —                     | —                   | Positive VPSE    | Negative VPSE    |
+              | 8         | —                     | —                   | Positive VPSE    | Negative VPSE    |
+            minItems: 1
+            maxItems: 2
+
+          polarity-supported:
+            $ref: /schemas/types.yaml#/definitions/string-array
+            description:
+              Polarity configuration supported by the PSE PI pairsets.
+            minItems: 1
+            maxItems: 4
+            items:
+              enum:
+                - MDI-X
+                - MDI
+                - X
+                - S
+
+        required:
+          - reg
+          - "#pse-cells"
+          - pairset-names
+          - pairsets
+          - polarity-supported
+
+oneOf:
+  - required:
+      - "#pse-cells"
+  - required:
+      - pse-pis
 
 additionalProperties: true
 

-- 
2.25.1

[PATCH net-next v5 12/17] net: pse-pd: Add support for setup_pi_matrix callback

[Kory Maincent]

Implement setup_pi_matrix callback to configure the PSE PI matrix. This
functionality is invoked before registering the PSE and following the core
parsing of the pse_pis devicetree subnode.

This patch is sponsored by Dent Project <dentproject@linuxfoundation.org>.

Signed-off-by: Kory Maincent <kory.maincent@bootlin.com>
---

Changes in v3:
- New patch
---
 drivers/net/pse-pd/pse_core.c | 6 ++++++
 include/linux/pse-pd/pse.h    | 2 ++
 2 files changed, 8 insertions(+)

diff --git a/drivers/net/pse-pd/pse_core.c b/drivers/net/pse-pd/pse_core.c
index 9124eb3d6492..a2eb9a424668 100644
--- a/drivers/net/pse-pd/pse_core.c
+++ b/drivers/net/pse-pd/pse_core.c
@@ -178,6 +178,12 @@ int pse_controller_register(struct pse_controller_dev *pcdev)
 	if (ret)
 		return ret;
 
+	if (pcdev->ops->setup_pi_matrix) {
+		ret = pcdev->ops->setup_pi_matrix(pcdev);
+		if (ret)
+			return ret;
+	}
+
 	mutex_lock(&pse_list_mutex);
 	list_add(&pcdev->list, &pse_controller_list);
 	mutex_unlock(&pse_list_mutex);
diff --git a/include/linux/pse-pd/pse.h b/include/linux/pse-pd/pse.h
index 01b3b9adfe2a..522115cc6cef 100644
--- a/include/linux/pse-pd/pse.h
+++ b/include/linux/pse-pd/pse.h
@@ -49,6 +49,7 @@ struct pse_control_status {
  *
  * @ethtool_get_status: get PSE control status for ethtool interface
  * @ethtool_set_config: set PSE control configuration over ethtool interface
+ * @setup_pi_matrix: setup PI matrix of the PSE controller
  */
 struct pse_controller_ops {
 	int (*ethtool_get_status)(struct pse_controller_dev *pcdev,
@@ -57,6 +58,7 @@ struct pse_controller_ops {
 	int (*ethtool_set_config)(struct pse_controller_dev *pcdev,
 		unsigned long id, struct netlink_ext_ack *extack,
 		const struct pse_control_config *config);
+	int (*setup_pi_matrix)(struct pse_controller_dev *pcdev);
 };
 
 struct module;

-- 
2.25.1

[PATCH net-next v5 13/17] net: pse-pd: Use regulator framework within PSE framework

[Kory Maincent]

Integrate the regulator framework to the PSE framework for enhanced
access to features such as voltage, power measurement, and limits, which
are akin to regulators. Additionally, PSE features like port priorities
could potentially enhance the regulator framework. Note that this
integration introduces some implementation complexity, including wrapper
callbacks and nested locks, but the potential benefits make it worthwhile.

Regulator are using enable counter with specific behavior.
Two calls to regulator_disable will trigger kernel warnings.
If the counter exceeds one, regulator_disable call won't disable the
PSE PI. These behavior isn't suitable for PSE control.
Added a boolean 'enabled' state to prevent multiple calls to
regulator_enable/disable. These calls will only be called from PSE
framework as it won't have any regulator children, therefore no mutex are
needed to safeguards this boolean.

regulator_get uses the consumer device pointer therefore of_pse_control_get
is modified accordingly to pass the PSE consumer device alongside its
device node.

This patch is sponsored by Dent Project <dentproject@linuxfoundation.org>.

Signed-off-by: Kory Maincent <kory.maincent@bootlin.com>
---

Changes in v3:
- New patch

Changes in v4:
- Remove the nested lock as the regulator_enable/disable ops will only
  be called from the PSE framework. No need to protect the 'enabled'
  boolean.
- Update regulator to current instead of voltage.
---
 drivers/net/mdio/fwnode_mdio.c     |  29 +++---
 drivers/net/pse-pd/pse_core.c      | 192 +++++++++++++++++++++++++++++++++----
 drivers/net/pse-pd/pse_regulator.c |  48 ++++++----
 include/linux/pse-pd/pse.h         |  18 +++-
 4 files changed, 230 insertions(+), 57 deletions(-)

diff --git a/drivers/net/mdio/fwnode_mdio.c b/drivers/net/mdio/fwnode_mdio.c
index fd02f5cbc853..aa20b2ac7f2d 100644
--- a/drivers/net/mdio/fwnode_mdio.c
+++ b/drivers/net/mdio/fwnode_mdio.c
@@ -17,19 +17,17 @@ MODULE_LICENSE("GPL");
 MODULE_DESCRIPTION("FWNODE MDIO bus (Ethernet PHY) accessors");
 
 static struct pse_control *
-fwnode_find_pse_control(struct fwnode_handle *fwnode)
+dev_find_pse_control(struct device *dev)
 {
 	struct pse_control *psec;
-	struct device_node *np;
 
 	if (!IS_ENABLED(CONFIG_PSE_CONTROLLER))
 		return NULL;
 
-	np = to_of_node(fwnode);
-	if (!np)
+	if (!dev->of_node)
 		return NULL;
 
-	psec = of_pse_control_get(np);
+	psec = of_pse_control_get(dev, dev->of_node);
 	if (PTR_ERR(psec) == -ENOENT)
 		return NULL;
 
@@ -120,15 +118,9 @@ int fwnode_mdiobus_register_phy(struct mii_bus *bus,
 	u32 phy_id;
 	int rc;
 
-	psec = fwnode_find_pse_control(child);
-	if (IS_ERR(psec))
-		return PTR_ERR(psec);
-
 	mii_ts = fwnode_find_mii_timestamper(child);
-	if (IS_ERR(mii_ts)) {
-		rc = PTR_ERR(mii_ts);
-		goto clean_pse;
-	}
+	if (IS_ERR(mii_ts))
+		return PTR_ERR(mii_ts);
 
 	is_c45 = fwnode_device_is_compatible(child, "ethernet-phy-ieee802.3-c45");
 	if (is_c45 || fwnode_get_phy_id(child, &phy_id))
@@ -161,6 +153,12 @@ int fwnode_mdiobus_register_phy(struct mii_bus *bus,
 			goto clean_phy;
 	}
 
+	psec = dev_find_pse_control(&phy->mdio.dev);
+	if (IS_ERR(psec)) {
+		rc = PTR_ERR(psec);
+		goto unregister_phy;
+	}
+
 	phy->psec = psec;
 
 	/* phy->mii_ts may already be defined by the PHY driver. A
@@ -172,12 +170,13 @@ int fwnode_mdiobus_register_phy(struct mii_bus *bus,
 
 	return 0;
 
+unregister_phy:
+	if (is_acpi_node(child) || is_of_node(child))
+		phy_device_remove(phy);
 clean_phy:
 	phy_device_free(phy);
 clean_mii_ts:
 	unregister_mii_timestamper(mii_ts);
-clean_pse:
-	pse_control_put(psec);
 
 	return rc;
 }
diff --git a/drivers/net/pse-pd/pse_core.c b/drivers/net/pse-pd/pse_core.c
index a2eb9a424668..58113718a47b 100644
--- a/drivers/net/pse-pd/pse_core.c
+++ b/drivers/net/pse-pd/pse_core.c
@@ -8,6 +8,8 @@
 #include <linux/device.h>
 #include <linux/of.h>
 #include <linux/pse-pd/pse.h>
+#include <linux/regulator/driver.h>
+#include <linux/regulator/machine.h>
 
 static DEFINE_MUTEX(pse_list_mutex);
 static LIST_HEAD(pse_controller_list);
@@ -16,12 +18,14 @@ static LIST_HEAD(pse_controller_list);
  * struct pse_control - a PSE control
  * @pcdev: a pointer to the PSE controller device
  *         this PSE control belongs to
+ * @ps: PSE PI supply of the PSE control
  * @list: list entry for the pcdev's PSE controller list
  * @id: ID of the PSE line in the PSE controller device
  * @refcnt: Number of gets of this pse_control
  */
 struct pse_control {
 	struct pse_controller_dev *pcdev;
+	struct regulator *ps;
 	struct list_head list;
 	unsigned int id;
 	struct kref refcnt;
@@ -160,13 +164,121 @@ static int of_load_pse_pis(struct pse_controller_dev *pcdev)
 	return ret;
 }
 
+static int pse_pi_is_enabled(struct regulator_dev *rdev)
+{
+	struct pse_controller_dev *pcdev = rdev_get_drvdata(rdev);
+	const struct pse_controller_ops *ops;
+	int id, ret;
+
+	ops = pcdev->ops;
+	if (!ops->pi_is_enabled)
+		return -EOPNOTSUPP;
+
+	id = rdev_get_id(rdev);
+	mutex_lock(&pcdev->lock);
+	ret = ops->pi_is_enabled(pcdev, id);
+	mutex_unlock(&pcdev->lock);
+
+	return ret;
+}
+
+static int pse_pi_enable(struct regulator_dev *rdev)
+{
+	struct pse_controller_dev *pcdev = rdev_get_drvdata(rdev);
+	const struct pse_controller_ops *ops;
+	int id, ret;
+
+	ops = pcdev->ops;
+	if (!ops->pi_enable)
+		return -EOPNOTSUPP;
+
+	id = rdev_get_id(rdev);
+	mutex_lock(&pcdev->lock);
+	ret = ops->pi_enable(pcdev, id);
+	if (!ret)
+		pcdev->pi[id].enabled = 1;
+	mutex_unlock(&pcdev->lock);
+
+	return ret;
+}
+
+static int pse_pi_disable(struct regulator_dev *rdev)
+{
+	struct pse_controller_dev *pcdev = rdev_get_drvdata(rdev);
+	const struct pse_controller_ops *ops;
+	int id, ret;
+
+	ops = pcdev->ops;
+	if (!ops->pi_disable)
+		return -EOPNOTSUPP;
+
+	id = rdev_get_id(rdev);
+	mutex_lock(&pcdev->lock);
+	ret = ops->pi_disable(pcdev, id);
+	if (!ret)
+		pcdev->pi[id].enabled = 0;
+	mutex_unlock(&pcdev->lock);
+
+	return ret;
+}
+
+static const struct regulator_ops pse_pi_ops = {
+	.is_enabled = pse_pi_is_enabled,
+	.enable = pse_pi_enable,
+	.disable = pse_pi_disable,
+};
+
+static const struct regulator_init_data pse_pi_initdata = {
+	.constraints = {
+		.valid_ops_mask = REGULATOR_CHANGE_STATUS,
+	},
+};
+
+static int
+devm_pse_pi_regulator_register(struct pse_controller_dev *pcdev,
+			       char *name, int id)
+{
+	struct regulator_config rconfig = {0};
+	struct regulator_desc *rdesc;
+	struct regulator_dev *rdev;
+
+	rdesc = devm_kzalloc(pcdev->dev, sizeof(*rdesc), GFP_KERNEL);
+	if (!rdesc)
+		return -ENOMEM;
+
+	/* Regulator descriptor id have to be the same as its associated
+	 * PSE PI id for the well functioning of the PSE controls.
+	 */
+	rdesc->id = id;
+	rdesc->name = name;
+	rdesc->type = REGULATOR_CURRENT;
+	rdesc->ops = &pse_pi_ops;
+	rdesc->owner = pcdev->owner;
+
+	rconfig.dev = pcdev->dev;
+	rconfig.driver_data = pcdev;
+	rconfig.init_data = &pse_pi_initdata;
+
+	rdev = devm_regulator_register(pcdev->dev, rdesc, &rconfig);
+	if (IS_ERR(rdev)) {
+		dev_err_probe(pcdev->dev, PTR_ERR(rdev),
+			      "Failed to register regulator\n");
+		return PTR_ERR(rdev);
+	}
+
+	pcdev->pi[id].rdev = rdev;
+
+	return 0;
+}
+
 /**
  * pse_controller_register - register a PSE controller device
  * @pcdev: a pointer to the initialized PSE controller device
  */
 int pse_controller_register(struct pse_controller_dev *pcdev)
 {
-	int ret;
+	size_t reg_name_len;
+	int ret, i;
 
 	mutex_init(&pcdev->lock);
 	INIT_LIST_HEAD(&pcdev->pse_control_head);
@@ -184,6 +296,31 @@ int pse_controller_register(struct pse_controller_dev *pcdev)
 			return ret;
 	}
 
+	/* Each regulator name len is pcdev dev name + 7 char +
+	 * int max digit number (10) + 1
+	 */
+	reg_name_len = strlen(dev_name(pcdev->dev)) + 18;
+
+	/* Register PI regulators */
+	for (i = 0; i < pcdev->nr_lines; i++) {
+		char *reg_name;
+
+		/* Do not register regulator for PIs not described */
+		if (!pcdev->of_legacy && !pcdev->pi[i].np)
+			continue;
+
+		reg_name = devm_kzalloc(pcdev->dev, reg_name_len, GFP_KERNEL);
+		if (!reg_name)
+			return -ENOMEM;
+
+		snprintf(reg_name, reg_name_len, "pse-%s_pi%d",
+			 dev_name(pcdev->dev), i);
+
+		ret = devm_pse_pi_regulator_register(pcdev, reg_name, i);
+		if (ret)
+			return ret;
+	}
+
 	mutex_lock(&pse_list_mutex);
 	list_add(&pcdev->list, &pse_controller_list);
 	mutex_unlock(&pse_list_mutex);
@@ -281,6 +418,9 @@ void pse_control_put(struct pse_control *psec)
 	if (IS_ERR_OR_NULL(psec))
 		return;
 
+	if (psec->pcdev->pi[psec->id].enabled)
+		regulator_disable(psec->ps);
+
 	mutex_lock(&pse_list_mutex);
 	__pse_control_put_internal(psec);
 	mutex_unlock(&pse_list_mutex);
@@ -288,9 +428,11 @@ void pse_control_put(struct pse_control *psec)
 EXPORT_SYMBOL_GPL(pse_control_put);
 
 static struct pse_control *
-pse_control_get_internal(struct pse_controller_dev *pcdev, unsigned int index)
+pse_control_get_internal(struct device *dev, struct pse_controller_dev *pcdev,
+			 unsigned int index)
 {
 	struct pse_control *psec;
+	int ret;
 
 	lockdep_assert_held(&pse_list_mutex);
 
@@ -310,6 +452,20 @@ pse_control_get_internal(struct pse_controller_dev *pcdev, unsigned int index)
 		return ERR_PTR(-ENODEV);
 	}
 
+	psec->ps = devm_regulator_get_exclusive(dev,
+						rdev_get_name(pcdev->pi[index].rdev));
+	if (IS_ERR(psec->ps)) {
+		kfree(psec);
+		return ERR_CAST(psec->ps);
+	}
+
+	ret = regulator_is_enabled(psec->ps);
+	if (ret < 0) {
+		kfree(psec);
+		return ERR_PTR(ret);
+	}
+	pcdev->pi[index].enabled = ret;
+
 	psec->pcdev = pcdev;
 	list_add(&psec->list, &pcdev->pse_control_head);
 	psec->id = index;
@@ -344,7 +500,8 @@ static int psec_id_legacy_xlate(struct pse_controller_dev *pcdev,
 	return pse_spec->args[0];
 }
 
-struct pse_control *of_pse_control_get(struct device_node *node)
+struct pse_control *of_pse_control_get(struct device *dev,
+				       struct device_node *node)
 {
 	struct pse_controller_dev *r, *pcdev;
 	struct of_phandle_args args;
@@ -394,7 +551,7 @@ struct pse_control *of_pse_control_get(struct device_node *node)
 	}
 
 	/* pse_list_mutex also protects the pcdev's pse_control list */
-	psec = pse_control_get_internal(pcdev, psec_id);
+	psec = pse_control_get_internal(dev, pcdev, psec_id);
 
 out:
 	mutex_unlock(&pse_list_mutex);
@@ -443,21 +600,24 @@ int pse_ethtool_set_config(struct pse_control *psec,
 			   struct netlink_ext_ack *extack,
 			   const struct pse_control_config *config)
 {
-	const struct pse_controller_ops *ops;
-	int err;
-
-	ops = psec->pcdev->ops;
+	int err = 0;
 
-	if (!ops->ethtool_set_config) {
-		NL_SET_ERR_MSG(extack,
-			       "PSE driver does not configuration");
-		return -EOPNOTSUPP;
+	/* Look at enabled status to not call regulator_enable or
+	 * regulator_disable twice creating a regulator counter mismatch
+	 */
+	switch (config->c33_admin_control) {
+	case ETHTOOL_C33_PSE_ADMIN_STATE_ENABLED:
+		if (!psec->pcdev->pi[psec->id].enabled)
+			err = regulator_enable(psec->ps);
+		break;
+	case ETHTOOL_C33_PSE_ADMIN_STATE_DISABLED:
+		if (psec->pcdev->pi[psec->id].enabled)
+			err = regulator_disable(psec->ps);
+		break;
+	default:
+		err = -EOPNOTSUPP;
 	}
 
-	mutex_lock(&psec->pcdev->lock);
-	err = ops->ethtool_set_config(psec->pcdev, psec->id, extack, config);
-	mutex_unlock(&psec->pcdev->lock);
-
 	return err;
 }
 EXPORT_SYMBOL_GPL(pse_ethtool_set_config);
diff --git a/drivers/net/pse-pd/pse_regulator.c b/drivers/net/pse-pd/pse_regulator.c
index 547af384764b..64ab36974fe0 100644
--- a/drivers/net/pse-pd/pse_regulator.c
+++ b/drivers/net/pse-pd/pse_regulator.c
@@ -24,37 +24,41 @@ static struct pse_reg_priv *to_pse_reg(struct pse_controller_dev *pcdev)
 }
 
 static int
-pse_reg_ethtool_set_config(struct pse_controller_dev *pcdev, unsigned long id,
-			   struct netlink_ext_ack *extack,
-			   const struct pse_control_config *config)
+pse_reg_pi_enable(struct pse_controller_dev *pcdev, int id)
 {
 	struct pse_reg_priv *priv = to_pse_reg(pcdev);
 	int ret;
 
-	if (priv->admin_state == config->podl_admin_control)
-		return 0;
-
-	switch (config->podl_admin_control) {
-	case ETHTOOL_PODL_PSE_ADMIN_STATE_ENABLED:
-		ret = regulator_enable(priv->ps);
-		break;
-	case ETHTOOL_PODL_PSE_ADMIN_STATE_DISABLED:
-		ret = regulator_disable(priv->ps);
-		break;
-	default:
-		dev_err(pcdev->dev, "Unknown admin state %i\n",
-			config->podl_admin_control);
-		ret = -ENOTSUPP;
-	}
-
+	ret = regulator_enable(priv->ps);
 	if (ret)
 		return ret;
 
-	priv->admin_state = config->podl_admin_control;
+	priv->admin_state = ETHTOOL_PODL_PSE_ADMIN_STATE_ENABLED;
+	return 0;
+}
+
+static int
+pse_reg_pi_disable(struct pse_controller_dev *pcdev, int id)
+{
+	struct pse_reg_priv *priv = to_pse_reg(pcdev);
+	int ret;
 
+	ret = regulator_disable(priv->ps);
+	if (ret)
+		return ret;
+
+	priv->admin_state = ETHTOOL_PODL_PSE_ADMIN_STATE_DISABLED;
 	return 0;
 }
 
+static int
+pse_reg_pi_is_enabled(struct pse_controller_dev *pcdev, int id)
+{
+	struct pse_reg_priv *priv = to_pse_reg(pcdev);
+
+	return regulator_is_enabled(priv->ps);
+}
+
 static int
 pse_reg_ethtool_get_status(struct pse_controller_dev *pcdev, unsigned long id,
 			   struct netlink_ext_ack *extack,
@@ -80,7 +84,9 @@ pse_reg_ethtool_get_status(struct pse_controller_dev *pcdev, unsigned long id,
 
 static const struct pse_controller_ops pse_reg_ops = {
 	.ethtool_get_status = pse_reg_ethtool_get_status,
-	.ethtool_set_config = pse_reg_ethtool_set_config,
+	.pi_enable = pse_reg_pi_enable,
+	.pi_is_enabled = pse_reg_pi_is_enabled,
+	.pi_disable = pse_reg_pi_disable,
 };
 
 static int
diff --git a/include/linux/pse-pd/pse.h b/include/linux/pse-pd/pse.h
index 522115cc6cef..a3e297cc2150 100644
--- a/include/linux/pse-pd/pse.h
+++ b/include/linux/pse-pd/pse.h
@@ -55,10 +55,10 @@ struct pse_controller_ops {
 	int (*ethtool_get_status)(struct pse_controller_dev *pcdev,
 		unsigned long id, struct netlink_ext_ack *extack,
 		struct pse_control_status *status);
-	int (*ethtool_set_config)(struct pse_controller_dev *pcdev,
-		unsigned long id, struct netlink_ext_ack *extack,
-		const struct pse_control_config *config);
 	int (*setup_pi_matrix)(struct pse_controller_dev *pcdev);
+	int (*pi_is_enabled)(struct pse_controller_dev *pcdev, int id);
+	int (*pi_enable)(struct pse_controller_dev *pcdev, int id);
+	int (*pi_disable)(struct pse_controller_dev *pcdev, int id);
 };
 
 struct module;
@@ -90,10 +90,14 @@ struct pse_pi_pairset {
  *
  * @pairset: table of the PSE PI pinout alternative for the two pairset
  * @np: device node pointer of the PSE PI node
+ * @rdev: regulator represented by the PSE PI
+ * @enabled: PI enabled state
  */
 struct pse_pi {
 	struct pse_pi_pairset pairset[2];
 	struct device_node *np;
+	struct regulator_dev *rdev;
+	bool enabled;
 };
 
 /**
@@ -107,6 +111,8 @@ struct pse_pi {
  * @of_pse_n_cells: number of cells in PSE line specifiers
  * @nr_lines: number of PSE controls in this controller device
  * @lock: Mutex for serialization access to the PSE controller
+ * @lock_owner: current owner of the mutex
+ * @ref_cnt: mutex's reference count
  * @types: types of the PSE controller
  * @pi: table of PSE PIs described in this controller device
  * @of_legacy: flag set if the pse_pis devicetree node is not used
@@ -132,7 +138,8 @@ struct device;
 int devm_pse_controller_register(struct device *dev,
 				 struct pse_controller_dev *pcdev);
 
-struct pse_control *of_pse_control_get(struct device_node *node);
+struct pse_control *of_pse_control_get(struct device *dev,
+				       struct device_node *node);
 void pse_control_put(struct pse_control *psec);
 
 int pse_ethtool_get_status(struct pse_control *psec,
@@ -147,7 +154,8 @@ bool pse_has_c33(struct pse_control *psec);
 
 #else
 
-static inline struct pse_control *of_pse_control_get(struct device_node *node)
+static inline struct pse_control *of_pse_control_get(struct device *dev,
+						     struct device_node *node)
 {
 	return ERR_PTR(-ENOENT);
 }

-- 
2.25.1

[PATCH net-next v5 14/17] dt-bindings: net: pse-pd: Add bindings for PD692x0 PSE controller

[Kory Maincent]

Add the PD692x0 I2C Power Sourcing Equipment controller device tree
bindings documentation.

This patch is sponsored by Dent Project <dentproject@linuxfoundation.org>.

Signed-off-by: Kory Maincent <kory.maincent@bootlin.com>
---

Changes in v2:
- Enhance ports-matrix description.
- Replace additionalProperties by unevaluatedProperties.
- Drop i2c suffix.

Changes in v3:
- Remove ports-matrix parameter.
- Add description of all physical ports and managers.
- Add pse_pis subnode moving to the API of pse-controller binding.
- Remove the MAINTAINERS section for this driver as I will be maintaining
  all pse-pd subsystem.

Changes in v5:
- Remove defs used only once.
- Replace underscore by dash.
- Add description.
---
 .../bindings/net/pse-pd/microchip,pd692x0.yaml     | 158 +++++++++++++++++++++
 1 file changed, 158 insertions(+)

diff --git a/Documentation/devicetree/bindings/net/pse-pd/microchip,pd692x0.yaml b/Documentation/devicetree/bindings/net/pse-pd/microchip,pd692x0.yaml
new file mode 100644
index 000000000000..62ea4363cba3
--- /dev/null
+++ b/Documentation/devicetree/bindings/net/pse-pd/microchip,pd692x0.yaml
@@ -0,0 +1,158 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/net/pse-pd/microchip,pd692x0.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Microchip PD692x0 Power Sourcing Equipment controller
+
+maintainers:
+  - Kory Maincent <kory.maincent@bootlin.com>
+
+allOf:
+  - $ref: pse-controller.yaml#
+
+properties:
+  compatible:
+    enum:
+      - microchip,pd69200
+      - microchip,pd69210
+      - microchip,pd69220
+
+  reg:
+    maxItems: 1
+
+  managers:
+    type: object
+    description:
+      List of the PD69208T4/PD69204T4/PD69208M PSE managers. Each manager
+      have 4 or 8 physical ports according to the chip version. No need to
+      specify the SPI chip select as it is automatically detected by the
+      PD692x0 PSE controller. The PSE managers have to be described from
+      the lowest chip select to the greatest one, which is the detection
+      behavior of the PD692x0 PSE controller. The PD692x0 support up to
+      12 PSE managers which can expose up to 96 physical ports. All
+      physical ports available on a manager have to be described in the
+      incremental order even if they are not used.
+
+    properties:
+      "#address-cells":
+        const: 1
+
+      "#size-cells":
+        const: 0
+
+    required:
+      - "#address-cells"
+      - "#size-cells"
+
+    patternProperties:
+      "^manager@0[0-9]|1[0-2]$":
+        $ref: /schemas/graph.yaml#/properties/ports
+        description:
+          PD69208T4/PD69204T4/PD69208M PSE manager exposing 4 or 8 physical
+          ports.
+
+        properties:
+          reg:
+            description:
+              Incremental index of the PSE manager starting from 0, ranging
+              from lowest to highest chip select, up to 12.
+            maxItems: 1
+
+        patternProperties:
+          '^port@[0-7]$':
+            type: object
+            required:
+              - reg
+
+        required:
+          - reg
+
+required:
+  - compatible
+  - reg
+  - pse-pis
+
+unevaluatedProperties: false
+
+examples:
+  - |
+    i2c {
+      #address-cells = <1>;
+      #size-cells = <0>;
+
+      ethernet-pse@3c {
+        compatible = "microchip,pd69200";
+        reg = <0x3c>;
+
+        managers {
+          #address-cells = <1>;
+          #size-cells = <0>;
+
+          manager@0 {
+            reg = <0>;
+            #address-cells = <1>;
+            #size-cells = <0>;
+
+            phys0: port@0 {
+              reg = <0>;
+            };
+
+            phys1: port@1 {
+              reg = <1>;
+            };
+
+            phys2: port@2 {
+              reg = <2>;
+            };
+
+            phys3: port@3 {
+              reg = <3>;
+            };
+          };
+
+          manager@1 {
+            reg = <1>;
+            #address-cells = <1>;
+            #size-cells = <0>;
+
+            phys4: port@0 {
+              reg = <0>;
+            };
+
+            phys5: port@1 {
+              reg = <1>;
+            };
+
+            phys6: port@2 {
+              reg = <2>;
+            };
+
+            phys7: port@3 {
+              reg = <3>;
+            };
+          };
+        };
+
+        pse-pis {
+          #address-cells = <1>;
+          #size-cells = <0>;
+
+          pse_pi0: pse-pi@0 {
+            reg = <0>;
+            #pse-cells = <0>;
+            pairset-names = "alternative-a", "alternative-b";
+            pairsets = <&phys0>, <&phys1>;
+            polarity-supported = "MDI", "S";
+          };
+          pse_pi1: pse-pi@1 {
+            reg = <1>;
+            #pse-cells = <0>;
+            pairset-names = "alternative-a";
+            pairsets = <&phys2>;
+            polarity-supported = "MDI";
+          };
+        };
+      };
+    };

-- 
2.25.1

[PATCH net-next v5 15/17] net: pse-pd: Add PD692x0 PSE controller driver

[Kory Maincent]

Add a new driver for the PD692x0 I2C Power Sourcing Equipment controller.
This driver only support i2c communication for now.

This patch is sponsored by Dent Project <dentproject@linuxfoundation.org>.

Signed-off-by: Kory Maincent <kory.maincent@bootlin.com>

---
Change in v2:
- Drop of_match_ptr
- Follow the "c33" PoE prefix naming change.
- Remove unused delay_recv variable. Then, remove struct pd692x0_msg_content
  which is similar to struct pd692x0_msg.
- Fix a weird sleep loop.
- Improve pd692x0_recv_msg for better readability.
- Fix a warning reported by Simon on a pd692x0_fw_write_line call.

Change in v3:
- Fix few nit.
- Change the return value of pd692x0_try_recv_msg function.
- Replace a dev_err() function to dev_err_probe().
- Replace pd692x0_update_matrix by the newly introduced setup_pi_matrix callback.
- Follow new bindings of managers subnode description.
- Update the pse ops with the newly introduced pi_enable, pi_is_enabled and
  pi_disable ones.
- Replace firmware version check by a softer one (< instead of =!).
- Rearrange the probe function, which had wrong ordering on error case
  between pcdcev registering and software version read.
- Fixed the probe function in the case it is call two times. The status
  won't be sent automatically on the second times so ask for it.
---
 drivers/net/pse-pd/Kconfig   |   11 +
 drivers/net/pse-pd/Makefile  |    1 +
 drivers/net/pse-pd/pd692x0.c | 1223 ++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 1235 insertions(+)

diff --git a/drivers/net/pse-pd/Kconfig b/drivers/net/pse-pd/Kconfig
index 687dec49c1e1..e3a6ba669f20 100644
--- a/drivers/net/pse-pd/Kconfig
+++ b/drivers/net/pse-pd/Kconfig
@@ -20,4 +20,15 @@ config PSE_REGULATOR
 	  Sourcing Equipment without automatic classification support. For
 	  example for basic implementation of PoDL (802.3bu) specification.
 
+config PSE_PD692X0
+	tristate "PD692X0 PSE controller"
+	depends on I2C
+	select FW_UPLOAD
+	help
+	  This module provides support for PD692x0 regulator based Ethernet
+	  Power Sourcing Equipment.
+
+	  To compile this driver as a module, choose M here: the
+	  module will be called pd692x0.
+
 endif
diff --git a/drivers/net/pse-pd/Makefile b/drivers/net/pse-pd/Makefile
index 1b8aa4c70f0b..9c12c4a65730 100644
--- a/drivers/net/pse-pd/Makefile
+++ b/drivers/net/pse-pd/Makefile
@@ -4,3 +4,4 @@
 obj-$(CONFIG_PSE_CONTROLLER) += pse_core.o
 
 obj-$(CONFIG_PSE_REGULATOR) += pse_regulator.o
+obj-$(CONFIG_PSE_PD692X0) += pd692x0.o
diff --git a/drivers/net/pse-pd/pd692x0.c b/drivers/net/pse-pd/pd692x0.c
new file mode 100644
index 000000000000..6488b941703c
--- /dev/null
+++ b/drivers/net/pse-pd/pd692x0.c
@@ -0,0 +1,1223 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Driver for the Microchip PD692X0 PoE PSE Controller driver (I2C bus)
+ *
+ * Copyright (c) 2023 Bootlin, Kory Maincent <kory.maincent@bootlin.com>
+ */
+
+#include <linux/delay.h>
+#include <linux/firmware.h>
+#include <linux/i2c.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/platform_device.h>
+#include <linux/pse-pd/pse.h>
+
+#define PD692X0_PSE_NAME "pd692x0_pse"
+
+#define PD692X0_MAX_PIS	48
+#define PD692X0_MAX_MANAGERS		12
+#define PD692X0_MAX_MANAGER_PORTS	8
+#define PD692X0_MAX_HW_PORTS	(PD692X0_MAX_MANAGERS * PD692X0_MAX_MANAGER_PORTS)
+
+#define PD69200_BT_PROD_VER	24
+#define PD69210_BT_PROD_VER	26
+#define PD69220_BT_PROD_VER	29
+
+#define PD692X0_FW_MAJ_VER	3
+#define PD692X0_FW_MIN_VER	5
+#define PD692X0_FW_PATCH_VER	5
+
+enum pd692x0_fw_state {
+	PD692X0_FW_UNKNOWN,
+	PD692X0_FW_OK,
+	PD692X0_FW_BROKEN,
+	PD692X0_FW_NEED_UPDATE,
+	PD692X0_FW_PREPARE,
+	PD692X0_FW_WRITE,
+	PD692X0_FW_COMPLETE,
+};
+
+struct pd692x0_msg {
+	u8 key;
+	u8 echo;
+	u8 sub[3];
+	u8 data[8];
+	__be16 chksum;
+} __packed;
+
+struct pd692x0_msg_ver {
+	u8 prod;
+	u8 maj_sw_ver;
+	u8 min_sw_ver;
+	u8 pa_sw_ver;
+	u8 param;
+	u8 build;
+};
+
+enum {
+	PD692X0_KEY_CMD,
+	PD692X0_KEY_PRG,
+	PD692X0_KEY_REQ,
+	PD692X0_KEY_TLM,
+	PD692X0_KEY_TEST,
+	PD692X0_KEY_REPORT = 0x52
+};
+
+enum {
+	PD692X0_MSG_RESET,
+	PD692X0_MSG_GET_SYS_STATUS,
+	PD692X0_MSG_GET_SW_VER,
+	PD692X0_MSG_SET_TMP_PORT_MATRIX,
+	PD692X0_MSG_PRG_PORT_MATRIX,
+	PD692X0_MSG_SET_PORT_PARAM,
+	PD692X0_MSG_GET_PORT_STATUS,
+	PD692X0_MSG_DOWNLOAD_CMD,
+
+	/* add new message above here */
+	PD692X0_MSG_CNT
+};
+
+struct pd692x0_priv {
+	struct i2c_client *client;
+	struct pse_controller_dev pcdev;
+	struct device_node *np;
+
+	enum pd692x0_fw_state fw_state;
+	struct fw_upload *fwl;
+	bool cancel_request;
+
+	u8 msg_id;
+	bool last_cmd_key;
+	unsigned long last_cmd_key_time;
+
+	enum ethtool_c33_pse_admin_state admin_state[PD692X0_MAX_PIS];
+};
+
+/* Template list of communication messages. The non-null bytes defined here
+ * constitute the fixed portion of the messages. The remaining bytes will
+ * be configured later within the functions. Refer to the "PD692x0 BT Serial
+ * Communication Protocol User Guide" for comprehensive details on messages
+ * content.
+ */
+static const struct pd692x0_msg pd692x0_msg_template_list[PD692X0_MSG_CNT] = {
+	[PD692X0_MSG_RESET] = {
+		.key = PD692X0_KEY_CMD,
+		.sub = {0x07, 0x55, 0x00},
+		.data = {0x55, 0x00, 0x55, 0x4e,
+			 0x4e, 0x4e, 0x4e, 0x4e},
+	},
+	[PD692X0_MSG_GET_SYS_STATUS] = {
+		.key = PD692X0_KEY_REQ,
+		.sub = {0x07, 0xd0, 0x4e},
+		.data = {0x4e, 0x4e, 0x4e, 0x4e,
+			 0x4e, 0x4e, 0x4e, 0x4e},
+	},
+	[PD692X0_MSG_GET_SW_VER] = {
+		.key = PD692X0_KEY_REQ,
+		.sub = {0x07, 0x1e, 0x21},
+		.data = {0x4e, 0x4e, 0x4e, 0x4e,
+			 0x4e, 0x4e, 0x4e, 0x4e},
+	},
+	[PD692X0_MSG_SET_TMP_PORT_MATRIX] = {
+		.key = PD692X0_KEY_CMD,
+		.sub	 = {0x05, 0x43},
+		.data = {   0, 0x4e, 0x4e, 0x4e,
+			 0x4e, 0x4e, 0x4e, 0x4e},
+	},
+	[PD692X0_MSG_PRG_PORT_MATRIX] = {
+		.key = PD692X0_KEY_CMD,
+		.sub = {0x07, 0x43, 0x4e},
+		.data = {0x4e, 0x4e, 0x4e, 0x4e,
+			 0x4e, 0x4e, 0x4e, 0x4e},
+	},
+	[PD692X0_MSG_SET_PORT_PARAM] = {
+		.key = PD692X0_KEY_CMD,
+		.sub = {0x05, 0xc0},
+		.data = {   0, 0xff, 0xff, 0xff,
+			 0x4e, 0x4e, 0x4e, 0x4e},
+	},
+	[PD692X0_MSG_GET_PORT_STATUS] = {
+		.key = PD692X0_KEY_REQ,
+		.sub = {0x05, 0xc1},
+		.data = {0x4e, 0x4e, 0x4e, 0x4e,
+			 0x4e, 0x4e, 0x4e, 0x4e},
+	},
+	[PD692X0_MSG_DOWNLOAD_CMD] = {
+		.key = PD692X0_KEY_PRG,
+		.sub = {0xff, 0x99, 0x15},
+		.data = {0x16, 0x16, 0x99, 0x4e,
+			 0x4e, 0x4e, 0x4e, 0x4e},
+	},
+};
+
+static u8 pd692x0_build_msg(struct pd692x0_msg *msg, u8 echo)
+{
+	u8 *data = (u8 *)msg;
+	u16 chksum = 0;
+	int i;
+
+	msg->echo = echo++;
+	if (echo == 0xff)
+		echo = 0;
+
+	for (i = 0; i < sizeof(*msg) - sizeof(msg->chksum); i++)
+		chksum += data[i];
+
+	msg->chksum = cpu_to_be16(chksum);
+
+	return echo;
+}
+
+static int pd692x0_send_msg(struct pd692x0_priv *priv, struct pd692x0_msg *msg)
+{
+	const struct i2c_client *client = priv->client;
+	int ret;
+
+	if (msg->key == PD692X0_KEY_CMD && priv->last_cmd_key) {
+		int cmd_msleep;
+
+		cmd_msleep = 30 - jiffies_to_msecs(jiffies - priv->last_cmd_key_time);
+		if (cmd_msleep > 0)
+			msleep(cmd_msleep);
+	}
+
+	/* Add echo and checksum bytes to the message */
+	priv->msg_id = pd692x0_build_msg(msg, priv->msg_id);
+
+	ret = i2c_master_send(client, (u8 *)msg, sizeof(*msg));
+	if (ret != sizeof(*msg))
+		return -EIO;
+
+	return 0;
+}
+
+static int pd692x0_reset(struct pd692x0_priv *priv)
+{
+	const struct i2c_client *client = priv->client;
+	struct pd692x0_msg msg, buf = {0};
+	int ret;
+
+	msg = pd692x0_msg_template_list[PD692X0_MSG_RESET];
+	ret = pd692x0_send_msg(priv, &msg);
+	if (ret) {
+		dev_err(&client->dev,
+			"Failed to reset the controller (%pe)\n", ERR_PTR(ret));
+		return ret;
+	}
+
+	msleep(30);
+
+	ret = i2c_master_recv(client, (u8 *)&buf, sizeof(buf));
+	if (ret != sizeof(buf))
+		return ret < 0 ? ret : -EIO;
+
+	/* Is the reply a successful report message */
+	if (buf.key != PD692X0_KEY_REPORT || buf.sub[0] || buf.sub[1])
+		return -EIO;
+
+	msleep(300);
+
+	ret = i2c_master_recv(client, (u8 *)&buf, sizeof(buf));
+	if (ret != sizeof(buf))
+		return ret < 0 ? ret : -EIO;
+
+	/* Is the boot status without error */
+	if (buf.key != 0x03 || buf.echo != 0xff || buf.sub[0] & 0x1) {
+		dev_err(&client->dev, "PSE controller error\n");
+		return -EIO;
+	}
+
+	return 0;
+}
+
+static bool pd692x0_try_recv_msg(const struct i2c_client *client,
+				 struct pd692x0_msg *msg,
+				 struct pd692x0_msg *buf)
+{
+	/* Wait 30ms before readback as mandated by the protocol */
+	msleep(30);
+
+	memset(buf, 0, sizeof(*buf));
+	i2c_master_recv(client, (u8 *)buf, sizeof(*buf));
+	if (buf->key)
+		return 0;
+
+	msleep(100);
+
+	memset(buf, 0, sizeof(*buf));
+	i2c_master_recv(client, (u8 *)buf, sizeof(*buf));
+	if (buf->key)
+		return 0;
+
+	return 1;
+}
+
+/* Implementation of I2C communication, specifically addressing scenarios
+ * involving communication loss. Refer to the "Synchronization During
+ * Communication Loss" section in the Communication Protocol document for
+ * further details.
+ */
+static int pd692x0_recv_msg(struct pd692x0_priv *priv,
+			    struct pd692x0_msg *msg,
+			    struct pd692x0_msg *buf)
+{
+	const struct i2c_client *client = priv->client;
+	int ret;
+
+	ret = pd692x0_try_recv_msg(client, msg, buf);
+	if (!ret)
+		goto out_success;
+
+	dev_warn(&client->dev,
+		 "Communication lost, rtnl is locked until communication is back!");
+
+	ret = pd692x0_send_msg(priv, msg);
+	if (ret)
+		return ret;
+
+	ret = pd692x0_try_recv_msg(client, msg, buf);
+	if (!ret)
+		goto out_success2;
+
+	msleep(10000);
+
+	ret = pd692x0_send_msg(priv, msg);
+	if (ret)
+		return ret;
+
+	ret = pd692x0_try_recv_msg(client, msg, buf);
+	if (!ret)
+		goto out_success2;
+
+	return pd692x0_reset(priv);
+
+out_success2:
+	dev_warn(&client->dev, "Communication is back, rtnl is unlocked!");
+out_success:
+	if (msg->key == PD692X0_KEY_CMD) {
+		priv->last_cmd_key = true;
+		priv->last_cmd_key_time = jiffies;
+	} else {
+		priv->last_cmd_key = false;
+	}
+
+	return 0;
+}
+
+static int pd692x0_sendrecv_msg(struct pd692x0_priv *priv,
+				struct pd692x0_msg *msg,
+				struct pd692x0_msg *buf)
+{
+	struct device *dev = &priv->client->dev;
+	int ret;
+
+	ret = pd692x0_send_msg(priv, msg);
+	if (ret)
+		return ret;
+
+	ret = pd692x0_recv_msg(priv, msg, buf);
+	if (ret)
+		return ret;
+
+	if (msg->echo != buf->echo) {
+		dev_err(dev,
+			"Wrong match in message ID, expect %d received %d.\n",
+			msg->echo, buf->echo);
+		return -EIO;
+	}
+
+	/* If the reply is a report message is it successful */
+	if (buf->key == PD692X0_KEY_REPORT &&
+	    (buf->sub[0] || buf->sub[1])) {
+		return -EIO;
+	}
+
+	return 0;
+}
+
+static struct pd692x0_priv *to_pd692x0_priv(struct pse_controller_dev *pcdev)
+{
+	return container_of(pcdev, struct pd692x0_priv, pcdev);
+}
+
+static int pd692x0_fw_unavailable(struct pd692x0_priv *priv)
+{
+	switch (priv->fw_state) {
+	case PD692X0_FW_OK:
+		return 0;
+	case PD692X0_FW_PREPARE:
+	case PD692X0_FW_WRITE:
+	case PD692X0_FW_COMPLETE:
+		dev_err(&priv->client->dev, "Firmware update in progress!\n");
+		return -EBUSY;
+	case PD692X0_FW_BROKEN:
+	case PD692X0_FW_NEED_UPDATE:
+	default:
+		dev_err(&priv->client->dev,
+			"Firmware issue. Please update it!\n");
+		return -EOPNOTSUPP;
+	}
+}
+
+static int pd692x0_pi_enable(struct pse_controller_dev *pcdev, int id)
+{
+	struct pd692x0_priv *priv = to_pd692x0_priv(pcdev);
+	struct pd692x0_msg msg, buf = {0};
+	int ret;
+
+	ret = pd692x0_fw_unavailable(priv);
+	if (ret)
+		return ret;
+
+	if (priv->admin_state[id] == ETHTOOL_C33_PSE_ADMIN_STATE_ENABLED)
+		return 0;
+
+	msg = pd692x0_msg_template_list[PD692X0_MSG_SET_PORT_PARAM];
+	msg.data[0] = 0x1;
+	msg.sub[2] = id;
+	ret = pd692x0_sendrecv_msg(priv, &msg, &buf);
+	if (ret < 0)
+		return ret;
+
+	priv->admin_state[id] = ETHTOOL_C33_PSE_ADMIN_STATE_ENABLED;
+
+	return 0;
+}
+
+static int pd692x0_pi_disable(struct pse_controller_dev *pcdev, int id)
+{
+	struct pd692x0_priv *priv = to_pd692x0_priv(pcdev);
+	struct pd692x0_msg msg, buf = {0};
+	int ret;
+
+	ret = pd692x0_fw_unavailable(priv);
+	if (ret)
+		return ret;
+
+	if (priv->admin_state[id] == ETHTOOL_C33_PSE_ADMIN_STATE_DISABLED)
+		return 0;
+
+	msg = pd692x0_msg_template_list[PD692X0_MSG_SET_PORT_PARAM];
+	msg.data[0] = 0x0;
+	msg.sub[2] = id;
+	ret = pd692x0_sendrecv_msg(priv, &msg, &buf);
+	if (ret < 0)
+		return ret;
+
+	priv->admin_state[id] = ETHTOOL_C33_PSE_ADMIN_STATE_DISABLED;
+
+	return 0;
+}
+
+static int pd692x0_pi_is_enabled(struct pse_controller_dev *pcdev, int id)
+{
+	struct pd692x0_priv *priv = to_pd692x0_priv(pcdev);
+	struct pd692x0_msg msg, buf = {0};
+	int ret;
+
+	ret = pd692x0_fw_unavailable(priv);
+	if (ret)
+		return ret;
+
+	msg = pd692x0_msg_template_list[PD692X0_MSG_GET_PORT_STATUS];
+	msg.sub[2] = id;
+	ret = pd692x0_sendrecv_msg(priv, &msg, &buf);
+	if (ret < 0)
+		return ret;
+
+	if (buf.sub[1]) {
+		priv->admin_state[id] = ETHTOOL_C33_PSE_ADMIN_STATE_ENABLED;
+		return 1;
+	} else {
+		priv->admin_state[id] = ETHTOOL_C33_PSE_ADMIN_STATE_DISABLED;
+		return 0;
+	}
+}
+
+static int pd692x0_ethtool_get_status(struct pse_controller_dev *pcdev,
+				      unsigned long id,
+				      struct netlink_ext_ack *extack,
+				      struct pse_control_status *status)
+{
+	struct pd692x0_priv *priv = to_pd692x0_priv(pcdev);
+	struct pd692x0_msg msg, buf = {0};
+	int ret;
+
+	ret = pd692x0_fw_unavailable(priv);
+	if (ret)
+		return ret;
+
+	msg = pd692x0_msg_template_list[PD692X0_MSG_GET_PORT_STATUS];
+	msg.sub[2] = id;
+	ret = pd692x0_sendrecv_msg(priv, &msg, &buf);
+	if (ret < 0)
+		return ret;
+
+	/* Compare Port Status (Communication Protocol Document par. 7.1) */
+	if ((buf.sub[0] & 0xf0) == 0x80 || (buf.sub[0] & 0xf0) == 0x90)
+		status->c33_pw_status = ETHTOOL_C33_PSE_PW_D_STATUS_DELIVERING;
+	else if (buf.sub[0] == 0x1b || buf.sub[0] == 0x22)
+		status->c33_pw_status = ETHTOOL_C33_PSE_PW_D_STATUS_SEARCHING;
+	else if (buf.sub[0] == 0x12)
+		status->c33_pw_status = ETHTOOL_C33_PSE_PW_D_STATUS_FAULT;
+	else
+		status->c33_pw_status = ETHTOOL_C33_PSE_PW_D_STATUS_DISABLED;
+
+	if (buf.sub[1])
+		status->c33_admin_state = ETHTOOL_C33_PSE_ADMIN_STATE_ENABLED;
+	else
+		status->c33_admin_state = ETHTOOL_C33_PSE_ADMIN_STATE_DISABLED;
+
+	priv->admin_state[id] = status->c33_admin_state;
+
+	return 0;
+}
+
+static struct pd692x0_msg_ver pd692x0_get_sw_version(struct pd692x0_priv *priv)
+{
+	struct device *dev = &priv->client->dev;
+	struct pd692x0_msg msg, buf = {0};
+	struct pd692x0_msg_ver ver = {0};
+	int ret;
+
+	msg = pd692x0_msg_template_list[PD692X0_MSG_GET_SW_VER];
+	ret = pd692x0_sendrecv_msg(priv, &msg, &buf);
+	if (ret < 0) {
+		dev_err(dev, "Failed to get PSE version (%pe)\n", ERR_PTR(ret));
+		return ver;
+	}
+
+	/* Extract version from the message */
+	ver.prod = buf.sub[2];
+	ver.maj_sw_ver = (buf.data[0] << 8 | buf.data[1]) / 100;
+	ver.min_sw_ver = ((buf.data[0] << 8 | buf.data[1]) / 10) % 10;
+	ver.pa_sw_ver = (buf.data[0] << 8 | buf.data[1]) % 10;
+	ver.param = buf.data[2];
+	ver.build = buf.data[3];
+
+	return ver;
+}
+
+struct pd692x0_manager {
+	struct device_node *port_node[PD692X0_MAX_MANAGER_PORTS];
+	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,
+			     struct device_node *np)
+{
+	struct device_node *node;
+	int ret, nports, i;
+
+	nports = 0;
+	for_each_child_of_node(np, node) {
+		u32 port;
+
+		if (!of_node_name_eq(node, "port"))
+			continue;
+
+		ret = of_property_read_u32(node, "reg", &port);
+		if (ret)
+			goto out;
+
+		if (port >= PD692X0_MAX_MANAGER_PORTS || port != nports) {
+			dev_err(&priv->client->dev,
+				"wrong number or order of manager ports (%d)\n",
+				port);
+			ret = -EINVAL;
+			goto out;
+		}
+
+		of_node_get(node);
+		manager->port_node[port] = node;
+		nports++;
+	}
+
+	manager->nports = nports;
+	return 0;
+
+out:
+	for (i = 0; i < nports; i++) {
+		of_node_put(manager->port_node[i]);
+		manager->port_node[i] = NULL;
+	}
+	of_node_put(node);
+	return ret;
+}
+
+static int
+pd692x0_of_get_managers(struct pd692x0_priv *priv,
+			struct pd692x0_manager manager[PD692X0_MAX_MANAGERS])
+{
+	struct device_node *managers_node, *node;
+	int ret, nmanagers, i, j;
+
+	if (!priv->np)
+		return -EINVAL;
+
+	nmanagers = 0;
+	managers_node = of_get_child_by_name(priv->np, "managers");
+	if (!managers_node)
+		return -EINVAL;
+
+	for_each_child_of_node(managers_node, node) {
+		u32 manager_id;
+
+		if (!of_node_name_eq(node, "manager"))
+			continue;
+
+		ret = of_property_read_u32(node, "reg", &manager_id);
+		if (ret)
+			goto out;
+
+		if (manager_id >= PD692X0_MAX_MANAGERS ||
+		    manager_id != nmanagers) {
+			dev_err(&priv->client->dev,
+				"wrong number or order of managers (%d)\n",
+				manager_id);
+			ret = -EINVAL;
+			goto out;
+		}
+
+		ret = pd692x0_of_get_ports_manager(priv, &manager[manager_id],
+						   node);
+		if (ret)
+			goto out;
+
+		nmanagers++;
+	}
+
+	of_node_put(managers_node);
+	return nmanagers;
+
+out:
+	for (i = 0; i < nmanagers; i++) {
+		for (j = 0; j < manager[i].nports; j++) {
+			of_node_put(manager[i].port_node[j]);
+			manager[i].port_node[j] = NULL;
+		}
+	}
+
+	of_node_put(node);
+	of_node_put(managers_node);
+	return ret;
+}
+
+static int
+pd692x0_set_port_matrix(const struct pse_pi_pairset *pairset,
+			const struct pd692x0_manager *manager,
+			int nmanagers, struct pd692x0_matrix *port_matrix)
+{
+	int i, j, port_cnt;
+	bool found = false;
+
+	if (!pairset->np)
+		return 0;
+
+	/* Look on every managers */
+	port_cnt = 0;
+	for (i = 0; i < nmanagers; i++) {
+		/* Look on every ports of the manager */
+		for (j = 0; j < manager[i].nports; j++) {
+			if (pairset->np == manager[i].port_node[j]) {
+				found = true;
+				break;
+			}
+		}
+		port_cnt += j;
+
+		if (found)
+			break;
+	}
+
+	if (!found)
+		return -ENODEV;
+
+	if (pairset->pinout == ALTERNATIVE_A)
+		port_matrix->hw_port_a = port_cnt;
+	else if (pairset->pinout == ALTERNATIVE_B)
+		port_matrix->hw_port_b = port_cnt;
+
+	return 0;
+}
+
+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])
+{
+	struct pse_controller_dev *pcdev = &priv->pcdev;
+	int i, ret;
+
+	/* Init Matrix */
+	for (i = 0; i < PD692X0_MAX_PIS; i++) {
+		port_matrix[i].hw_port_a = 0xff;
+		port_matrix[i].hw_port_b = 0xff;
+	}
+
+	/* 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,
+					      &port_matrix[i]);
+		if (ret) {
+			dev_err(&priv->client->dev,
+				"unable to configure pi %d pairset 0", i);
+			return ret;
+		}
+
+		ret = pd692x0_set_port_matrix(&pcdev->pi[i].pairset[1],
+					      manager, nmanagers,
+					      &port_matrix[i]);
+		if (ret) {
+			dev_err(&priv->client->dev,
+				"unable to configure pi %d pairset 1", i);
+			return ret;
+		}
+	}
+
+	return 0;
+}
+
+static int
+pd692x0_write_ports_matrix(struct pd692x0_priv *priv,
+			   const struct pd692x0_matrix port_matrix[PD692X0_MAX_PIS])
+{
+	struct pd692x0_msg msg, buf;
+	int ret, i;
+
+	/* Write temporary Matrix */
+	msg = pd692x0_msg_template_list[PD692X0_MSG_SET_TMP_PORT_MATRIX];
+	for (i = 0; i < PD692X0_MAX_PIS; i++) {
+		msg.sub[2] = i;
+		msg.data[0] = port_matrix[i].hw_port_b;
+		msg.data[1] = port_matrix[i].hw_port_a;
+
+		ret = pd692x0_sendrecv_msg(priv, &msg, &buf);
+		if (ret < 0)
+			return ret;
+	}
+
+	/* Program Matrix */
+	msg = pd692x0_msg_template_list[PD692X0_MSG_PRG_PORT_MATRIX];
+	ret = pd692x0_sendrecv_msg(priv, &msg, &buf);
+	if (ret < 0)
+		return ret;
+
+	return 0;
+}
+
+static int pd692x0_setup_pi_matrix(struct pse_controller_dev *pcdev)
+{
+	struct pd692x0_manager manager[PD692X0_MAX_MANAGERS] = {0};
+	struct pd692x0_priv *priv = to_pd692x0_priv(pcdev);
+	struct pd692x0_matrix port_matrix[PD692X0_MAX_PIS];
+	int ret, i, j, nmanagers;
+
+	/* Should we flash the port matrix */
+	if (priv->fw_state != PD692X0_FW_OK &&
+	    priv->fw_state != PD692X0_FW_COMPLETE)
+		return 0;
+
+	ret = pd692x0_of_get_managers(priv, manager);
+	if (ret < 0)
+		return ret;
+
+	nmanagers = ret;
+	ret = pd692x0_set_ports_matrix(priv, manager, nmanagers, port_matrix);
+	if (ret)
+		goto out;
+
+	ret = pd692x0_write_ports_matrix(priv, port_matrix);
+	if (ret)
+		goto out;
+
+out:
+	for (i = 0; i < nmanagers; i++) {
+		for (j = 0; j < manager[i].nports; j++)
+			of_node_put(manager[i].port_node[j]);
+	}
+	return ret;
+}
+
+static const struct pse_controller_ops pd692x0_ops = {
+	.setup_pi_matrix = pd692x0_setup_pi_matrix,
+	.ethtool_get_status = pd692x0_ethtool_get_status,
+	.pi_enable = pd692x0_pi_enable,
+	.pi_disable = pd692x0_pi_disable,
+	.pi_is_enabled = pd692x0_pi_is_enabled,
+};
+
+#define PD692X0_FW_LINE_MAX_SZ 0xff
+static int pd692x0_fw_get_next_line(const u8 *data,
+				    char *line, size_t size)
+{
+	size_t line_size;
+	int i;
+
+	line_size = min_t(size_t, size, PD692X0_FW_LINE_MAX_SZ);
+
+	memset(line, 0, PD692X0_FW_LINE_MAX_SZ);
+	for (i = 0; i < line_size - 1; i++) {
+		if (*data == '\r' && *(data + 1) == '\n') {
+			line[i] = '\r';
+			line[i + 1] = '\n';
+			return i + 2;
+		}
+		line[i] = *data;
+		data++;
+	}
+
+	return -EIO;
+}
+
+static enum fw_upload_err
+pd692x0_fw_recv_resp(const struct i2c_client *client, unsigned long ms_timeout,
+		     const char *msg_ok, unsigned int msg_size)
+{
+	/* Maximum controller response size */
+	char fw_msg_buf[5] = {0};
+	unsigned long timeout;
+	int ret;
+
+	if (msg_size > sizeof(fw_msg_buf))
+		return FW_UPLOAD_ERR_RW_ERROR;
+
+	/* Read until we get something */
+	timeout = msecs_to_jiffies(ms_timeout) + jiffies;
+	while (true) {
+		if (time_is_before_jiffies(timeout))
+			return FW_UPLOAD_ERR_TIMEOUT;
+
+		ret = i2c_master_recv(client, fw_msg_buf, 1);
+		if (ret < 0 || *fw_msg_buf == 0) {
+			usleep_range(1000, 2000);
+			continue;
+		} else {
+			break;
+		}
+	}
+
+	/* Read remaining characters */
+	ret = i2c_master_recv(client, fw_msg_buf + 1, msg_size - 1);
+	if (strncmp(fw_msg_buf, msg_ok, msg_size)) {
+		dev_err(&client->dev,
+			"Wrong FW download process answer (%*pE)\n",
+			msg_size, fw_msg_buf);
+		return FW_UPLOAD_ERR_HW_ERROR;
+	}
+
+	return FW_UPLOAD_ERR_NONE;
+}
+
+static int pd692x0_fw_write_line(const struct i2c_client *client,
+				 const char line[PD692X0_FW_LINE_MAX_SZ],
+				 const bool last_line)
+{
+	int ret;
+
+	while (*line != 0) {
+		ret = i2c_master_send(client, line, 1);
+		if (ret < 0)
+			return FW_UPLOAD_ERR_RW_ERROR;
+		line++;
+	}
+
+	if (last_line) {
+		ret = pd692x0_fw_recv_resp(client, 100, "TP\r\n",
+					   sizeof("TP\r\n") - 1);
+		if (ret)
+			return ret;
+	} else {
+		ret = pd692x0_fw_recv_resp(client, 100, "T*\r\n",
+					   sizeof("T*\r\n") - 1);
+		if (ret)
+			return ret;
+	}
+
+	return FW_UPLOAD_ERR_NONE;
+}
+
+static enum fw_upload_err pd692x0_fw_reset(const struct i2c_client *client)
+{
+	const struct pd692x0_msg zero = {0};
+	struct pd692x0_msg buf = {0};
+	unsigned long timeout;
+	char cmd[] = "RST";
+	int ret;
+
+	ret = i2c_master_send(client, cmd, strlen(cmd));
+	if (ret < 0) {
+		dev_err(&client->dev,
+			"Failed to reset the controller (%pe)\n",
+			ERR_PTR(ret));
+		return ret;
+	}
+
+	timeout = msecs_to_jiffies(10000) + jiffies;
+	while (true) {
+		if (time_is_before_jiffies(timeout))
+			return FW_UPLOAD_ERR_TIMEOUT;
+
+		ret = i2c_master_recv(client, (u8 *)&buf, sizeof(buf));
+		if (ret < 0 ||
+		    !memcmp(&buf, &zero, sizeof(buf)))
+			usleep_range(1000, 2000);
+		else
+			break;
+	}
+
+	/* Is the reply a successful report message */
+	if (buf.key != PD692X0_KEY_TLM || buf.echo != 0xff ||
+	    buf.sub[0] & 0x01) {
+		dev_err(&client->dev, "PSE controller error\n");
+		return FW_UPLOAD_ERR_HW_ERROR;
+	}
+
+	/* Is the firmware operational */
+	if (buf.sub[0] & 0x02) {
+		dev_err(&client->dev,
+			"PSE firmware error. Please update it.\n");
+		return FW_UPLOAD_ERR_HW_ERROR;
+	}
+
+	return FW_UPLOAD_ERR_NONE;
+}
+
+static enum fw_upload_err pd692x0_fw_prepare(struct fw_upload *fwl,
+					     const u8 *data, u32 size)
+{
+	struct pd692x0_priv *priv = fwl->dd_handle;
+	const struct i2c_client *client = priv->client;
+	enum pd692x0_fw_state last_fw_state;
+	int ret;
+
+	priv->cancel_request = false;
+	last_fw_state = priv->fw_state;
+
+	priv->fw_state = PD692X0_FW_PREPARE;
+
+	/* Enter program mode */
+	if (last_fw_state == PD692X0_FW_BROKEN) {
+		const char *msg = "ENTR";
+		const char *c;
+
+		c = msg;
+		do {
+			ret = i2c_master_send(client, c, 1);
+			if (ret < 0)
+				return FW_UPLOAD_ERR_RW_ERROR;
+			if (*(c + 1))
+				usleep_range(10000, 20000);
+		} while (*(++c));
+	} else {
+		struct pd692x0_msg msg, buf;
+
+		msg = pd692x0_msg_template_list[PD692X0_MSG_DOWNLOAD_CMD];
+		ret = pd692x0_sendrecv_msg(priv, &msg, &buf);
+		if (ret < 0) {
+			dev_err(&client->dev,
+				"Failed to enter programming mode (%pe)\n",
+				ERR_PTR(ret));
+			return FW_UPLOAD_ERR_RW_ERROR;
+		}
+	}
+
+	ret = pd692x0_fw_recv_resp(client, 100, "TPE\r\n", sizeof("TPE\r\n") - 1);
+	if (ret)
+		goto err_out;
+
+	if (priv->cancel_request) {
+		ret = FW_UPLOAD_ERR_CANCELED;
+		goto err_out;
+	}
+
+	return FW_UPLOAD_ERR_NONE;
+
+err_out:
+	pd692x0_fw_reset(priv->client);
+	priv->fw_state = last_fw_state;
+	return ret;
+}
+
+static enum fw_upload_err pd692x0_fw_write(struct fw_upload *fwl,
+					   const u8 *data, u32 offset,
+					   u32 size, u32 *written)
+{
+	struct pd692x0_priv *priv = fwl->dd_handle;
+	char line[PD692X0_FW_LINE_MAX_SZ];
+	const struct i2c_client *client;
+	int ret, i;
+	char cmd;
+
+	client = priv->client;
+	priv->fw_state = PD692X0_FW_WRITE;
+
+	/* Erase */
+	cmd = 'E';
+	ret = i2c_master_send(client, &cmd, 1);
+	if (ret < 0) {
+		dev_err(&client->dev,
+			"Failed to boot programming mode (%pe)\n",
+			ERR_PTR(ret));
+		return FW_UPLOAD_ERR_RW_ERROR;
+	}
+
+	ret = pd692x0_fw_recv_resp(client, 100, "TOE\r\n", sizeof("TOE\r\n") - 1);
+	if (ret)
+		return ret;
+
+	ret = pd692x0_fw_recv_resp(client, 5000, "TE\r\n", sizeof("TE\r\n") - 1);
+	if (ret)
+		dev_warn(&client->dev,
+			 "Failed to erase internal memory, however still try to write Firmware\n");
+
+	ret = pd692x0_fw_recv_resp(client, 100, "TPE\r\n", sizeof("TPE\r\n") - 1);
+	if (ret)
+		dev_warn(&client->dev,
+			 "Failed to erase internal memory, however still try to write Firmware\n");
+
+	if (priv->cancel_request)
+		return FW_UPLOAD_ERR_CANCELED;
+
+	/* Program */
+	cmd = 'P';
+	ret = i2c_master_send(client, &cmd, sizeof(char));
+	if (ret < 0) {
+		dev_err(&client->dev,
+			"Failed to boot programming mode (%pe)\n",
+			ERR_PTR(ret));
+		return ret;
+	}
+
+	ret = pd692x0_fw_recv_resp(client, 100, "TOP\r\n", sizeof("TOP\r\n") - 1);
+	if (ret)
+		return ret;
+
+	i = 0;
+	while (i < size) {
+		ret = pd692x0_fw_get_next_line(data, line, size - i);
+		if (ret < 0) {
+			ret = FW_UPLOAD_ERR_FW_INVALID;
+			goto err;
+		}
+
+		i += ret;
+		data += ret;
+		if (line[0] == 'S' && line[1] == '0') {
+			continue;
+		} else if (line[0] == 'S' && line[1] == '7') {
+			ret = pd692x0_fw_write_line(client, line, true);
+			if (ret)
+				goto err;
+		} else {
+			ret = pd692x0_fw_write_line(client, line, false);
+			if (ret)
+				goto err;
+		}
+
+		if (priv->cancel_request) {
+			ret = FW_UPLOAD_ERR_CANCELED;
+			goto err;
+		}
+	}
+	*written = i;
+
+	msleep(400);
+
+	return FW_UPLOAD_ERR_NONE;
+
+err:
+	strscpy_pad(line, "S7\r\n", sizeof(line));
+	pd692x0_fw_write_line(client, line, true);
+	return ret;
+}
+
+static enum fw_upload_err pd692x0_fw_poll_complete(struct fw_upload *fwl)
+{
+	struct pd692x0_priv *priv = fwl->dd_handle;
+	const struct i2c_client *client = priv->client;
+	struct pd692x0_msg_ver ver;
+	int ret;
+
+	priv->fw_state = PD692X0_FW_COMPLETE;
+
+	ret = pd692x0_fw_reset(client);
+	if (ret)
+		return ret;
+
+	ver = pd692x0_get_sw_version(priv);
+	if (ver.maj_sw_ver < PD692X0_FW_MAJ_VER) {
+		dev_err(&client->dev,
+			"Too old firmware version. Please update it\n");
+		priv->fw_state = PD692X0_FW_NEED_UPDATE;
+		return FW_UPLOAD_ERR_FW_INVALID;
+	}
+
+	ret = pd692x0_setup_pi_matrix(&priv->pcdev);
+	if (ret < 0) {
+		dev_err(&client->dev, "Error configuring ports matrix (%pe)\n",
+			ERR_PTR(ret));
+		priv->fw_state = PD692X0_FW_NEED_UPDATE;
+		return FW_UPLOAD_ERR_HW_ERROR;
+	}
+
+	priv->fw_state = PD692X0_FW_OK;
+	return FW_UPLOAD_ERR_NONE;
+}
+
+static void pd692x0_fw_cancel(struct fw_upload *fwl)
+{
+	struct pd692x0_priv *priv = fwl->dd_handle;
+
+	priv->cancel_request = true;
+}
+
+static void pd692x0_fw_cleanup(struct fw_upload *fwl)
+{
+	struct pd692x0_priv *priv = fwl->dd_handle;
+
+	switch (priv->fw_state) {
+	case PD692X0_FW_WRITE:
+		pd692x0_fw_reset(priv->client);
+		fallthrough;
+	case PD692X0_FW_COMPLETE:
+		priv->fw_state = PD692X0_FW_BROKEN;
+		break;
+	default:
+		break;
+	}
+}
+
+static const struct fw_upload_ops pd692x0_fw_ops = {
+	.prepare = pd692x0_fw_prepare,
+	.write = pd692x0_fw_write,
+	.poll_complete = pd692x0_fw_poll_complete,
+	.cancel = pd692x0_fw_cancel,
+	.cleanup = pd692x0_fw_cleanup,
+};
+
+static int pd692x0_i2c_probe(struct i2c_client *client)
+{
+	struct pd692x0_msg msg, buf = {0}, zero = {0};
+	struct device *dev = &client->dev;
+	struct pd692x0_msg_ver ver;
+	struct pd692x0_priv *priv;
+	struct fw_upload *fwl;
+	int ret;
+
+	if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
+		dev_err(dev, "i2c check functionality failed\n");
+		return -ENXIO;
+	}
+
+	priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
+	if (!priv)
+		return -ENOMEM;
+
+	priv->client = client;
+	i2c_set_clientdata(client, priv);
+
+	ret = i2c_master_recv(client, (u8 *)&buf, sizeof(buf));
+	if (ret != sizeof(buf)) {
+		dev_err(dev, "Failed to get device status\n");
+		return -EIO;
+	}
+
+	/* Probe has been already run and the status dumped */
+	if (!memcmp(&buf, &zero, sizeof(buf))) {
+		/* Ask again the controller status */
+		msg = pd692x0_msg_template_list[PD692X0_MSG_GET_SYS_STATUS];
+		ret = pd692x0_sendrecv_msg(priv, &msg, &buf);
+		if (ret < 0) {
+			dev_err(dev, "Failed to get device status\n");
+			return ret;
+		}
+	}
+
+	if (buf.key != 0x03 || buf.sub[0] & 0x01) {
+		dev_err(dev, "PSE controller error\n");
+		return -EIO;
+	}
+	if (buf.sub[0] & 0x02) {
+		dev_err(dev, "PSE firmware error. Please update it.\n");
+		priv->fw_state = PD692X0_FW_BROKEN;
+	} else {
+		ver = pd692x0_get_sw_version(priv);
+		dev_info(&client->dev, "Software version %d.%02d.%d.%d\n",
+			 ver.prod, ver.maj_sw_ver, ver.min_sw_ver,
+			 ver.pa_sw_ver);
+
+		if (ver.maj_sw_ver < PD692X0_FW_MAJ_VER) {
+			dev_err(dev, "Too old firmware version. Please update it\n");
+			priv->fw_state = PD692X0_FW_NEED_UPDATE;
+		} else {
+			priv->fw_state = PD692X0_FW_OK;
+		}
+	}
+
+	priv->np = dev->of_node;
+	priv->pcdev.nr_lines = PD692X0_MAX_PIS;
+	priv->pcdev.owner = THIS_MODULE;
+	priv->pcdev.ops = &pd692x0_ops;
+	priv->pcdev.dev = dev;
+	priv->pcdev.types = ETHTOOL_PSE_C33;
+	ret = devm_pse_controller_register(dev, &priv->pcdev);
+	if (ret)
+		return dev_err_probe(dev, ret,
+				     "failed to register PSE controller\n");
+
+	fwl = firmware_upload_register(THIS_MODULE, dev, dev_name(dev),
+				       &pd692x0_fw_ops, priv);
+	if (IS_ERR(fwl))
+		return dev_err_probe(dev, PTR_ERR(fwl),
+				     "failed to register to the Firmware Upload API\n");
+	priv->fwl = fwl;
+
+	return 0;
+}
+
+static void pd692x0_i2c_remove(struct i2c_client *client)
+{
+	struct pd692x0_priv *priv = i2c_get_clientdata(client);
+
+	firmware_upload_unregister(priv->fwl);
+}
+
+static const struct i2c_device_id pd692x0_id[] = {
+	{ PD692X0_PSE_NAME, 0 },
+	{ },
+};
+MODULE_DEVICE_TABLE(i2c, pd692x0_id);
+
+static const struct of_device_id pd692x0_of_match[] = {
+	{ .compatible = "microchip,pd69200", },
+	{ .compatible = "microchip,pd69210", },
+	{ .compatible = "microchip,pd69220", },
+	{ },
+};
+MODULE_DEVICE_TABLE(of, pd692x0_of_match);
+
+static struct i2c_driver pd692x0_driver = {
+	.probe		= pd692x0_i2c_probe,
+	.remove		= pd692x0_i2c_remove,
+	.id_table	= pd692x0_id,
+	.driver		= {
+		.name		= PD692X0_PSE_NAME,
+		.of_match_table = pd692x0_of_match,
+	},
+};
+module_i2c_driver(pd692x0_driver);
+
+MODULE_AUTHOR("Kory Maincent <kory.maincent@bootlin.com>");
+MODULE_DESCRIPTION("Microchip PD692x0 PoE PSE Controller driver");
+MODULE_LICENSE("GPL");

-- 
2.25.1

[PATCH net-next v5 16/17] dt-bindings: net: pse-pd: Add bindings for TPS23881 PSE controller

[Kory Maincent]

Add the TPS23881 I2C Power Sourcing Equipment controller device tree
bindings documentation.

This patch is sponsored by Dent Project <dentproject@linuxfoundation.org>.

Signed-off-by: Kory Maincent <kory.maincent@bootlin.com>

---
Change in v3:
- New patch.

Change in v4:
- Rename the file to ti,tps23881 as it support only this version of the PSE
  controller.
---
 .../bindings/net/pse-pd/ti,tps23881.yaml           | 93 ++++++++++++++++++++++
 1 file changed, 93 insertions(+)

diff --git a/Documentation/devicetree/bindings/net/pse-pd/ti,tps23881.yaml b/Documentation/devicetree/bindings/net/pse-pd/ti,tps23881.yaml
new file mode 100644
index 000000000000..b8891d109e51
--- /dev/null
+++ b/Documentation/devicetree/bindings/net/pse-pd/ti,tps23881.yaml
@@ -0,0 +1,93 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/net/pse-pd/ti,tps23881.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: TI TPS23881 Power Sourcing Equipment controller
+
+maintainers:
+  - Kory Maincent <kory.maincent@bootlin.com>
+
+allOf:
+  - $ref: pse-controller.yaml#
+
+properties:
+  compatible:
+    enum:
+      - ti,tps23881
+
+  reg:
+    maxItems: 1
+
+  '#pse-cells':
+    const: 1
+
+  channels:
+    description: each set of 8 ports can be assigned to one physical
+      channels or two for PoE4. This parameter describes the configuration
+      of the ports conversion matrix that establishes relationship between
+      the logical ports and the physical channels.
+    type: object
+
+    patternProperties:
+      '^channel@[0-7]$':
+        type: object
+        required:
+          - reg
+
+unevaluatedProperties: false
+
+required:
+  - compatible
+  - reg
+
+examples:
+  - |
+    i2c {
+      #address-cells = <1>;
+      #size-cells = <0>;
+
+      ethernet-pse@20 {
+        compatible = "ti,tps23881";
+        reg = <0x20>;
+
+        channels {
+          #address-cells = <1>;
+          #size-cells = <0>;
+
+          phys0: channel@0 {
+            reg = <0>;
+          };
+
+          phys1: channel@1 {
+            reg = <1>;
+          };
+
+          phys2: channel@2 {
+            reg = <2>;
+          };
+        };
+
+        pse-pis {
+          #address-cells = <1>;
+          #size-cells = <0>;
+
+          pse_pi0: pse-pi@0 {
+            reg = <0>;
+            #pse-cells = <0>;
+            pairset-names = "alternative-a", "alternative-b";
+            pairsets = <&phys0>, <&phys1>;
+            polarity-supported = "MDI", "S";
+          };
+
+          pse_pi1: pse-pi@1 {
+            reg = <1>;
+            #pse-cells = <0>;
+            pairset-names = "alternative-a";
+            pairsets = <&phys2>;
+            polarity-supported = "MDI";
+          };
+        };
+      };
+    };

-- 
2.25.1

[PATCH net-next v5 17/17] net: pse-pd: Add TI TPS23881 PSE controller driver

[Kory Maincent]

Add a new driver for the TI TPS23881 I2C Power Sourcing Equipment
controller.

This patch is sponsored by Dent Project <dentproject@linuxfoundation.org>.

Signed-off-by: Kory Maincent <kory.maincent@bootlin.com>

---
Change in v3:
- New patch.
---
 drivers/net/pse-pd/Kconfig    |   9 +
 drivers/net/pse-pd/Makefile   |   1 +
 drivers/net/pse-pd/tps23881.c | 818 ++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 828 insertions(+)

diff --git a/drivers/net/pse-pd/Kconfig b/drivers/net/pse-pd/Kconfig
index e3a6ba669f20..80cf373a5a0e 100644
--- a/drivers/net/pse-pd/Kconfig
+++ b/drivers/net/pse-pd/Kconfig
@@ -31,4 +31,13 @@ config PSE_PD692X0
 	  To compile this driver as a module, choose M here: the
 	  module will be called pd692x0.
 
+config PSE_TPS23881
+	tristate "TPS23881 PSE controller"
+	depends on I2C
+	help
+	  This module provides support for TPS23881 regulator based Ethernet
+	  Power Sourcing Equipment.
+
+	  To compile this driver as a module, choose M here: the
+	  module will be called tps23881.
 endif
diff --git a/drivers/net/pse-pd/Makefile b/drivers/net/pse-pd/Makefile
index 9c12c4a65730..9d2898b36737 100644
--- a/drivers/net/pse-pd/Makefile
+++ b/drivers/net/pse-pd/Makefile
@@ -5,3 +5,4 @@ obj-$(CONFIG_PSE_CONTROLLER) += pse_core.o
 
 obj-$(CONFIG_PSE_REGULATOR) += pse_regulator.o
 obj-$(CONFIG_PSE_PD692X0) += pd692x0.o
+obj-$(CONFIG_PSE_TPS23881) += tps23881.o
diff --git a/drivers/net/pse-pd/tps23881.c b/drivers/net/pse-pd/tps23881.c
new file mode 100644
index 000000000000..253eb525d3f3
--- /dev/null
+++ b/drivers/net/pse-pd/tps23881.c
@@ -0,0 +1,818 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Driver for the TI TPS23881 PoE PSE Controller driver (I2C bus)
+ *
+ * Copyright (c) 2023 Bootlin, Kory Maincent <kory.maincent@bootlin.com>
+ */
+
+#include <linux/delay.h>
+#include <linux/firmware.h>
+#include <linux/i2c.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/platform_device.h>
+#include <linux/pse-pd/pse.h>
+
+#define TPS23881_MAX_CHANS 8
+
+#define TPS23881_REG_PW_STATUS	0x10
+#define TPS23881_REG_OP_MODE	0x12
+#define TPS23881_REG_DIS_EN	0x13
+#define TPS23881_REG_DET_CLA_EN	0x14
+#define TPS23881_REG_GEN_MASK	0x17
+#define TPS23881_REG_NBITACC	BIT(5)
+#define TPS23881_REG_PW_EN	0x19
+#define TPS23881_REG_PORT_MAP	0x26
+#define TPS23881_REG_PORT_POWER	0x29
+#define TPS23881_REG_POEPLUS	0x40
+#define TPS23881_REG_TPON	BIT(0)
+#define TPS23881_REG_FWREV	0x41
+#define TPS23881_REG_DEVID	0x43
+#define TPS23881_REG_SRAM_CTRL	0x60
+#define TPS23881_REG_SRAM_DATA	0x61
+
+struct tps23881_port_desc {
+	u8 chan[2];
+	bool is_4p;
+};
+
+struct tps23881_priv {
+	struct i2c_client *client;
+	struct pse_controller_dev pcdev;
+	struct device_node *np;
+	struct tps23881_port_desc port[TPS23881_MAX_CHANS];
+};
+
+static struct tps23881_priv *to_tps23881_priv(struct pse_controller_dev *pcdev)
+{
+	return container_of(pcdev, struct tps23881_priv, pcdev);
+}
+
+static int tps23881_pi_enable(struct pse_controller_dev *pcdev, int id)
+{
+	struct tps23881_priv *priv = to_tps23881_priv(pcdev);
+	struct i2c_client *client = priv->client;
+	u8 chan;
+	u16 val;
+	int ret;
+
+	if (id >= TPS23881_MAX_CHANS)
+		return -ERANGE;
+
+	ret = i2c_smbus_read_word_data(client, TPS23881_REG_PW_STATUS);
+	if (ret < 0)
+		return ret;
+
+	chan = priv->port[id].chan[0];
+	if (chan < 4)
+		val = (u16)(ret | BIT(chan));
+	else
+		val = (u16)(ret | BIT(chan + 4));
+
+	if (priv->port[id].is_4p) {
+		chan = priv->port[id].chan[1];
+		if (chan < 4)
+			val |= BIT(chan);
+		else
+			val |= BIT(chan + 4);
+	}
+
+	ret = i2c_smbus_write_word_data(client, TPS23881_REG_PW_EN, val);
+	if (ret < 0)
+		return ret;
+
+	return 0;
+}
+
+static int tps23881_pi_disable(struct pse_controller_dev *pcdev, int id)
+{
+	struct tps23881_priv *priv = to_tps23881_priv(pcdev);
+	struct i2c_client *client = priv->client;
+	u8 chan;
+	u16 val;
+	int ret;
+
+	if (id >= TPS23881_MAX_CHANS)
+		return -ERANGE;
+
+	ret = i2c_smbus_read_word_data(client, TPS23881_REG_PW_STATUS);
+	if (ret < 0)
+		return ret;
+
+	chan = priv->port[id].chan[0];
+	if (chan < 4)
+		val = (u16)(ret | BIT(chan + 4));
+	else
+		val = (u16)(ret | BIT(chan + 8));
+
+	if (priv->port[id].is_4p) {
+		chan = priv->port[id].chan[1];
+		if (chan < 4)
+			val |= BIT(chan + 4);
+		else
+			val |= BIT(chan + 8);
+	}
+
+	ret = i2c_smbus_write_word_data(client, TPS23881_REG_PW_EN, val);
+	if (ret < 0)
+		return ret;
+
+	return 0;
+}
+
+static int tps23881_pi_is_enabled(struct pse_controller_dev *pcdev, int id)
+{
+	struct tps23881_priv *priv = to_tps23881_priv(pcdev);
+	struct i2c_client *client = priv->client;
+	bool enabled;
+	u8 chan;
+	int ret;
+
+	ret = i2c_smbus_read_word_data(client, TPS23881_REG_PW_STATUS);
+	if (ret < 0)
+		return ret;
+
+	chan = priv->port[id].chan[0];
+	if (chan < 4)
+		enabled = ret & BIT(chan);
+	else
+		enabled = ret & BIT(chan + 4);
+
+	if (priv->port[id].is_4p) {
+		chan = priv->port[id].chan[1];
+		if (chan < 4)
+			enabled &= !!(ret & BIT(chan));
+		else
+			enabled &= !!(ret & BIT(chan + 4));
+	}
+
+	/* Return enabled status only if both channel are on this state */
+	return enabled;
+}
+
+static int tps23881_ethtool_get_status(struct pse_controller_dev *pcdev,
+				       unsigned long id,
+				       struct netlink_ext_ack *extack,
+				       struct pse_control_status *status)
+{
+	struct tps23881_priv *priv = to_tps23881_priv(pcdev);
+	struct i2c_client *client = priv->client;
+	bool enabled, delivering;
+	u8 chan;
+	int ret;
+
+	ret = i2c_smbus_read_word_data(client, TPS23881_REG_PW_STATUS);
+	if (ret < 0)
+		return ret;
+
+	chan = priv->port[id].chan[0];
+	if (chan < 4) {
+		enabled = ret & BIT(chan);
+		delivering = ret & BIT(chan + 4);
+	} else {
+		enabled = ret & BIT(chan + 4);
+		delivering = ret & BIT(chan + 8);
+	}
+
+	if (priv->port[id].is_4p) {
+		chan = priv->port[id].chan[1];
+		if (chan < 4) {
+			enabled &= !!(ret & BIT(chan));
+			delivering &= !!(ret & BIT(chan + 4));
+		} else {
+			enabled &= !!(ret & BIT(chan + 4));
+			delivering &= !!(ret & BIT(chan + 8));
+		}
+	}
+
+	/* Return delivering status only if both channel are on this state */
+	if (delivering)
+		status->c33_pw_status = ETHTOOL_C33_PSE_PW_D_STATUS_DELIVERING;
+	else
+		status->c33_pw_status = ETHTOOL_C33_PSE_PW_D_STATUS_DISABLED;
+
+	/* Return enabled status only if both channel are on this state */
+	if (enabled)
+		status->c33_admin_state = ETHTOOL_C33_PSE_ADMIN_STATE_ENABLED;
+	else
+		status->c33_admin_state = ETHTOOL_C33_PSE_ADMIN_STATE_DISABLED;
+
+	return 0;
+}
+
+/* Parse managers subnode into a array of device node */
+static int
+tps23881_get_of_channels(struct tps23881_priv *priv,
+			 struct device_node *chan_node[TPS23881_MAX_CHANS])
+{
+	struct device_node *channels_node, *node;
+	int i, ret;
+
+	if (!priv->np)
+		return -EINVAL;
+
+	channels_node = of_find_node_by_name(priv->np, "channels");
+	if (!channels_node)
+		return -EINVAL;
+
+	for_each_child_of_node(channels_node, node) {
+		u32 chan_id;
+
+		if (!of_node_name_eq(node, "channel"))
+			continue;
+
+		ret = of_property_read_u32(node, "reg", &chan_id);
+		if (ret) {
+			ret = -EINVAL;
+			goto out;
+		}
+
+		if (chan_id >= TPS23881_MAX_CHANS || chan_node[chan_id]) {
+			dev_err(&priv->client->dev,
+				"wrong number of port (%d)\n", chan_id);
+			ret = -EINVAL;
+			goto out;
+		}
+
+		of_node_get(node);
+		chan_node[chan_id] = node;
+	}
+
+	of_node_put(channels_node);
+	return 0;
+
+out:
+	for (i = 0; i < TPS23881_MAX_CHANS; i++) {
+		of_node_put(chan_node[i]);
+		chan_node[i] = NULL;
+	}
+
+	of_node_put(node);
+	of_node_put(channels_node);
+	return ret;
+}
+
+struct tps23881_port_matrix {
+	u8 pi_id;
+	u8 lgcl_chan[2];
+	u8 hw_chan[2];
+	bool is_4p;
+	bool exist;
+};
+
+static int
+tps23881_match_channel(const struct pse_pi_pairset *pairset,
+		       struct device_node *chan_node[TPS23881_MAX_CHANS])
+{
+	int i;
+
+	/* Look on every channels */
+	for (i = 0; i < TPS23881_MAX_CHANS; i++) {
+		if (pairset->np == chan_node[i])
+			return i;
+	}
+
+	return -ENODEV;
+}
+
+static bool
+tps23881_is_chan_free(struct tps23881_port_matrix port_matrix[TPS23881_MAX_CHANS],
+		      int chan)
+{
+	int i;
+
+	for (i = 0; i < TPS23881_MAX_CHANS; i++) {
+		if (port_matrix[i].exist &&
+		    (port_matrix[i].hw_chan[0] == chan ||
+		    port_matrix[i].hw_chan[1] == chan))
+			return false;
+	}
+
+	return true;
+}
+
+/* Fill port matrix with the matching channels */
+static int
+tps23881_match_port_matrix(struct pse_pi *pi, int pi_id,
+			   struct device_node *chan_node[TPS23881_MAX_CHANS],
+			   struct tps23881_port_matrix port_matrix[TPS23881_MAX_CHANS])
+{
+	int ret;
+
+	if (!pi->pairset[0].np)
+		return 0;
+
+	ret = tps23881_match_channel(&pi->pairset[0], chan_node);
+	if (ret < 0)
+		return ret;
+
+	if (!tps23881_is_chan_free(port_matrix, ret)) {
+		pr_err("tps23881: channel %d already used\n", ret);
+		return -ENODEV;
+	}
+
+	port_matrix[pi_id].hw_chan[0] = ret;
+	port_matrix[pi_id].exist = true;
+
+	if (!pi->pairset[1].np)
+		return 0;
+
+	ret = tps23881_match_channel(&pi->pairset[1], chan_node);
+	if (ret < 0)
+		return ret;
+
+	if (!tps23881_is_chan_free(port_matrix, ret)) {
+		pr_err("tps23881: channel %d already used\n", ret);
+		return -ENODEV;
+	}
+
+	if (port_matrix[pi_id].hw_chan[0] / 4 != ret / 4) {
+		pr_err("tps23881: 4-pair PSE can only be set within the same 4 ports group");
+		return -ENODEV;
+	}
+
+	port_matrix[pi_id].hw_chan[1] = ret;
+	port_matrix[pi_id].is_4p = true;
+
+	return 0;
+}
+
+static int
+tps23881_get_unused_chan(struct tps23881_port_matrix port_matrix[TPS23881_MAX_CHANS],
+			 int port_cnt)
+{
+	bool used;
+	int i, j;
+
+	for (i = 0; i < TPS23881_MAX_CHANS; i++) {
+		used = false;
+
+		for (j = 0; j < port_cnt; j++) {
+			if (port_matrix[j].hw_chan[0] == i) {
+				used = true;
+				break;
+			}
+
+			if (port_matrix[j].is_4p &&
+			    port_matrix[j].hw_chan[1] == i) {
+				used = true;
+				break;
+			}
+		}
+
+		if (!used)
+			return i;
+	}
+
+	return -1;
+}
+
+/* Sort the port matrix to following particular hardware ports matrix
+ * specification of the tps23881. The device has two 4-ports groups and
+ * each 4-pair powered device has to be configured to use two consecutive
+ * logical channel in each 4 ports group (1 and 2 or 3 and 4). Also the
+ * hardware matrix has to be fully configured even with unused chan to be
+ * valid.
+ */
+static int
+tps23881_sort_port_matrix(struct tps23881_port_matrix port_matrix[TPS23881_MAX_CHANS])
+{
+	struct tps23881_port_matrix tmp_port_matrix[TPS23881_MAX_CHANS] = {0};
+	int i, ret, port_cnt = 0, cnt_4ch_grp1 = 0, cnt_4ch_grp2 = 4;
+
+	/* Configure 4p port matrix */
+	for (i = 0; i < TPS23881_MAX_CHANS; i++) {
+		int *cnt;
+
+		if (!port_matrix[i].exist || !port_matrix[i].is_4p)
+			continue;
+
+		if (port_matrix[i].hw_chan[0] < 4)
+			cnt = &cnt_4ch_grp1;
+		else
+			cnt = &cnt_4ch_grp2;
+
+		tmp_port_matrix[port_cnt].exist = true;
+		tmp_port_matrix[port_cnt].is_4p = true;
+		tmp_port_matrix[port_cnt].pi_id = i;
+		tmp_port_matrix[port_cnt].hw_chan[0] = port_matrix[i].hw_chan[0];
+		tmp_port_matrix[port_cnt].hw_chan[1] = port_matrix[i].hw_chan[1];
+
+		/* 4-pair ports have to be configured with consecutive
+		 * logical channels 0 and 1, 2 and 3.
+		 */
+		tmp_port_matrix[port_cnt].lgcl_chan[0] = (*cnt)++;
+		tmp_port_matrix[port_cnt].lgcl_chan[1] = (*cnt)++;
+
+		port_cnt++;
+	}
+
+	/* Configure 2p port matrix */
+	for (i = 0; i < TPS23881_MAX_CHANS; i++) {
+		int *cnt;
+
+		if (!port_matrix[i].exist || port_matrix[i].is_4p)
+			continue;
+
+		if (port_matrix[i].hw_chan[0] < 4)
+			cnt = &cnt_4ch_grp1;
+		else
+			cnt = &cnt_4ch_grp2;
+
+		tmp_port_matrix[port_cnt].exist = true;
+		tmp_port_matrix[port_cnt].pi_id = i;
+		tmp_port_matrix[port_cnt].lgcl_chan[0] = (*cnt)++;
+		tmp_port_matrix[port_cnt].hw_chan[0] = port_matrix[i].hw_chan[0];
+
+		port_cnt++;
+	}
+
+	/* Complete the rest of the first 4 port group matrix even if
+	 * channels are unused
+	 */
+	while (cnt_4ch_grp1 < 4) {
+		ret = tps23881_get_unused_chan(tmp_port_matrix, port_cnt);
+		if (ret < 0) {
+			pr_err("tps23881: port matrix issue, no chan available\n");
+			return -ENODEV;
+		}
+
+		if (port_cnt >= TPS23881_MAX_CHANS) {
+			pr_err("tps23881: wrong number of channels\n");
+			return -ENODEV;
+		}
+		tmp_port_matrix[port_cnt].lgcl_chan[0] = cnt_4ch_grp1;
+		tmp_port_matrix[port_cnt].hw_chan[0] = ret;
+		cnt_4ch_grp1++;
+		port_cnt++;
+	}
+
+	/* Complete the rest of the second 4 port group matrix even if
+	 * channels are unused
+	 */
+	while (cnt_4ch_grp2 < 8) {
+		ret = tps23881_get_unused_chan(tmp_port_matrix, port_cnt);
+		if (ret < 0) {
+			pr_err("tps23881: port matrix issue, no chan available\n");
+			return -ENODEV;
+		}
+
+		if (port_cnt >= TPS23881_MAX_CHANS) {
+			pr_err("tps23881: wrong number of channels\n");
+			return -ENODEV;
+		}
+		tmp_port_matrix[port_cnt].lgcl_chan[0] = cnt_4ch_grp2;
+		tmp_port_matrix[port_cnt].hw_chan[0] = ret;
+		cnt_4ch_grp2++;
+		port_cnt++;
+	}
+
+	memcpy(port_matrix, tmp_port_matrix, sizeof(tmp_port_matrix));
+
+	return port_cnt;
+}
+
+/* Write port matrix to the hardware port matrix and the software port
+ * matrix.
+ */
+static int
+tps23881_write_port_matrix(struct tps23881_priv *priv,
+			   struct tps23881_port_matrix port_matrix[TPS23881_MAX_CHANS],
+			   int port_cnt)
+{
+	struct i2c_client *client = priv->client;
+	u8 pi_id, lgcl_chan, hw_chan;
+	u16 val = 0;
+	int i, ret;
+
+	for (i = 0; i < port_cnt; i++) {
+		pi_id = port_matrix[i].pi_id;
+		lgcl_chan = port_matrix[i].lgcl_chan[0];
+		hw_chan = port_matrix[i].hw_chan[0] % 4;
+
+		/* Set software port matrix for existing ports */
+		if (port_matrix[i].exist)
+			priv->port[pi_id].chan[0] = lgcl_chan;
+
+		/* Set hardware port matrix for all ports */
+		val |= hw_chan << (lgcl_chan * 2);
+
+		if (!port_matrix[i].is_4p)
+			continue;
+
+		lgcl_chan = port_matrix[i].lgcl_chan[1];
+		hw_chan = port_matrix[i].hw_chan[1] % 4;
+
+		/* Set software port matrix for existing ports */
+		if (port_matrix[i].exist) {
+			priv->port[pi_id].is_4p = true;
+			priv->port[pi_id].chan[1] = lgcl_chan;
+		}
+
+		/* Set hardware port matrix for all ports */
+		val |= hw_chan << (lgcl_chan * 2);
+	}
+
+	/* Write hardware ports matrix */
+	ret = i2c_smbus_write_word_data(client, TPS23881_REG_PORT_MAP, val);
+	if (ret < 0)
+		return ret;
+
+	return 0;
+}
+
+static int
+tps23881_set_ports_conf(struct tps23881_priv *priv,
+			struct tps23881_port_matrix port_matrix[TPS23881_MAX_CHANS])
+{
+	struct i2c_client *client = priv->client;
+	int i, ret;
+	u16 val;
+
+	/* Set operating mode */
+	ret = i2c_smbus_write_word_data(client, TPS23881_REG_OP_MODE, 0xaaaa);
+	if (ret < 0)
+		return ret;
+
+	/* Disable DC disconnect */
+	ret = i2c_smbus_write_word_data(client, TPS23881_REG_DIS_EN, 0x0);
+	if (ret < 0)
+		return ret;
+
+	/* Set port power allocation */
+	val = 0;
+	for (i = 0; i < TPS23881_MAX_CHANS; i++) {
+		if (!port_matrix[i].exist)
+			continue;
+
+		if (port_matrix[i].is_4p)
+			val |= 0xf << ((port_matrix[i].lgcl_chan[0] / 2) * 4);
+		else
+			val |= 0x3 << ((port_matrix[i].lgcl_chan[0] / 2) * 4);
+	}
+	ret = i2c_smbus_write_word_data(client, TPS23881_REG_PORT_POWER, val);
+	if (ret < 0)
+		return ret;
+
+	/* Enable detection and classification */
+	val = 0;
+	for (i = 0; i < TPS23881_MAX_CHANS; i++) {
+		if (!port_matrix[i].exist)
+			continue;
+
+		val |= BIT(port_matrix[i].lgcl_chan[0]) |
+		       BIT(port_matrix[i].lgcl_chan[0] + 4);
+		if (port_matrix[i].is_4p)
+			val |= BIT(port_matrix[i].lgcl_chan[1]) |
+			       BIT(port_matrix[i].lgcl_chan[1] + 4);
+	}
+	ret = i2c_smbus_write_word_data(client, TPS23881_REG_DET_CLA_EN, 0xffff);
+	if (ret < 0)
+		return ret;
+
+	return 0;
+}
+
+static int
+tps23881_set_ports_matrix(struct tps23881_priv *priv,
+			  struct device_node *chan_node[TPS23881_MAX_CHANS])
+{
+	struct tps23881_port_matrix port_matrix[TPS23881_MAX_CHANS] = {0};
+	int i, ret;
+
+	/* Update with values for every PSE PIs */
+	for (i = 0; i < TPS23881_MAX_CHANS; i++) {
+		ret = tps23881_match_port_matrix(&priv->pcdev.pi[i], i,
+						 chan_node, port_matrix);
+		if (ret)
+			return ret;
+	}
+
+	ret = tps23881_sort_port_matrix(port_matrix);
+	if (ret < 0)
+		return ret;
+
+	ret = tps23881_write_port_matrix(priv, port_matrix, ret);
+	if (ret)
+		return ret;
+
+	ret = tps23881_set_ports_conf(priv, port_matrix);
+	if (ret)
+		return ret;
+
+	return 0;
+}
+
+static int tps23881_setup_pi_matrix(struct pse_controller_dev *pcdev)
+{
+	struct device_node *chan_node[TPS23881_MAX_CHANS] = {NULL};
+	struct tps23881_priv *priv = to_tps23881_priv(pcdev);
+	int ret, i;
+
+	ret = tps23881_get_of_channels(priv, chan_node);
+	if (ret < 0) {
+		dev_warn(&priv->client->dev,
+			 "Unable to parse port-matrix, default matrix will be used\n");
+		return 0;
+	}
+
+	ret = tps23881_set_ports_matrix(priv, chan_node);
+
+	for (i = 0; i < TPS23881_MAX_CHANS; i++)
+		of_node_put(chan_node[i]);
+
+	return ret;
+}
+
+static const struct pse_controller_ops tps23881_ops = {
+	.setup_pi_matrix = tps23881_setup_pi_matrix,
+	.pi_enable = tps23881_pi_enable,
+	.pi_disable = tps23881_pi_disable,
+	.pi_is_enabled = tps23881_pi_is_enabled,
+	.ethtool_get_status = tps23881_ethtool_get_status,
+};
+
+static const char fw_parity_name[] = "ti/tps23881/tps23881-parity-14.bin";
+static const char fw_sram_name[] = "ti/tps23881/tps23881-sram-14.bin";
+
+struct tps23881_fw_conf {
+	u8 reg;
+	u8 val;
+};
+
+static const struct tps23881_fw_conf tps23881_parity_flash_conf[] = {
+	{.reg = 0x60, .val = 0x01},
+	{.reg = 0x62, .val = 0x00},
+	{.reg = 0x63, .val = 0x80},
+	{.reg = 0x60, .val = 0xC4},
+	{.reg = 0x1D, .val = 0xBC},
+	{.reg = 0xD7, .val = 0x02},
+	{.reg = 0x91, .val = 0x00},
+	{.reg = 0x90, .val = 0x00},
+	{.reg = 0xD7, .val = 0x00},
+	{.reg = 0x1D, .val = 0x00},
+	{ /* sentinel */ }
+};
+
+static const struct tps23881_fw_conf tps23881_sram_flash_conf[] = {
+	{.reg = 0x60, .val = 0xC5},
+	{.reg = 0x62, .val = 0x00},
+	{.reg = 0x63, .val = 0x80},
+	{.reg = 0x60, .val = 0xC0},
+	{.reg = 0x1D, .val = 0xBC},
+	{.reg = 0xD7, .val = 0x02},
+	{.reg = 0x91, .val = 0x00},
+	{.reg = 0x90, .val = 0x00},
+	{.reg = 0xD7, .val = 0x00},
+	{.reg = 0x1D, .val = 0x00},
+	{ /* sentinel */ }
+};
+
+static int tps23881_flash_fw_part(struct i2c_client *client,
+				  const char *fw_name,
+				  const struct tps23881_fw_conf *fw_conf)
+{
+	const struct firmware *fw = NULL;
+	int i, ret;
+
+	ret = request_firmware(&fw, fw_name, &client->dev);
+	if (ret)
+		return ret;
+
+	dev_info(&client->dev, "Flashing %s\n", fw_name);
+
+	/* Prepare device for RAM download */
+	while (fw_conf->reg) {
+		ret = i2c_smbus_write_byte_data(client, fw_conf->reg,
+						fw_conf->val);
+		if (ret < 0)
+			return ret;
+
+		fw_conf++;
+	}
+
+	/* Flash the firmware file */
+	for (i = 0; i < fw->size; i++) {
+		ret = i2c_smbus_write_byte_data(client,
+						TPS23881_REG_SRAM_DATA,
+						fw->data[i]);
+		if (ret < 0)
+			return ret;
+	}
+
+	release_firmware(fw);
+
+	return 0;
+}
+
+static int tps23881_flash_fw(struct i2c_client *client)
+{
+	int ret;
+
+	ret = tps23881_flash_fw_part(client, fw_parity_name,
+				     tps23881_parity_flash_conf);
+	if (ret)
+		return ret;
+
+	ret = tps23881_flash_fw_part(client, fw_sram_name,
+				     tps23881_sram_flash_conf);
+	if (ret)
+		return ret;
+
+	ret = i2c_smbus_write_byte_data(client, TPS23881_REG_SRAM_CTRL, 0x18);
+	if (ret < 0)
+		return ret;
+
+	mdelay(12);
+
+	return 0;
+}
+
+static int tps23881_i2c_probe(struct i2c_client *client)
+{
+	struct device *dev = &client->dev;
+	struct tps23881_priv *priv;
+	int ret;
+	u8 val;
+
+	if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
+		dev_err(dev, "i2c check functionality failed\n");
+		return -ENXIO;
+	}
+
+	priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
+	if (!priv)
+		return -ENOMEM;
+
+	ret = i2c_smbus_read_byte_data(client, TPS23881_REG_DEVID);
+	if (ret < 0)
+		return ret;
+
+	if (ret != 0x22) {
+		dev_err(dev, "Wrong device ID\n");
+		return -ENXIO;
+	}
+
+	ret = tps23881_flash_fw(client);
+	if (ret < 0)
+		return ret;
+
+	ret = i2c_smbus_read_byte_data(client, TPS23881_REG_FWREV);
+	if (ret < 0)
+		return ret;
+
+	dev_info(&client->dev, "Firmware revision 0x%x\n", ret);
+
+	/* Set configuration B, 16 bit access on a single device address */
+	ret = i2c_smbus_read_byte_data(client, TPS23881_REG_GEN_MASK);
+	if (ret < 0)
+		return ret;
+
+	val = ret | TPS23881_REG_NBITACC;
+	ret = i2c_smbus_write_byte_data(client, TPS23881_REG_GEN_MASK, val);
+	if (ret < 0)
+		return ret;
+
+	priv->client = client;
+	i2c_set_clientdata(client, priv);
+	priv->np = dev->of_node;
+
+	priv->pcdev.owner = THIS_MODULE;
+	priv->pcdev.ops = &tps23881_ops;
+	priv->pcdev.dev = dev;
+	priv->pcdev.types = ETHTOOL_PSE_C33;
+	priv->pcdev.nr_lines = TPS23881_MAX_CHANS;
+	ret = devm_pse_controller_register(dev, &priv->pcdev);
+	if (ret) {
+		return dev_err_probe(dev, ret,
+				     "failed to register PSE controller\n");
+	}
+
+	return ret;
+}
+
+static const struct i2c_device_id tps23881_id[] = {
+	{ "tps23881", 0 },
+	{ },
+};
+MODULE_DEVICE_TABLE(i2c, tps23881_id);
+
+static const struct of_device_id tps23881_of_match[] = {
+	{ .compatible = "ti,tps23881", },
+	{ },
+};
+MODULE_DEVICE_TABLE(of, tps23881_of_match);
+
+static struct i2c_driver tps23881_driver = {
+	.probe		= tps23881_i2c_probe,
+	.id_table	= tps23881_id,
+	.driver		= {
+		.name		= "tps23881",
+		.of_match_table = tps23881_of_match,
+	},
+};
+module_i2c_driver(tps23881_driver);
+
+MODULE_AUTHOR("Kory Maincent <kory.maincent@bootlin.com>");
+MODULE_DESCRIPTION("TI TPS23881 PoE PSE Controller driver");
+MODULE_LICENSE("GPL");

-- 
2.25.1

Re: [PATCH net-next v5 00/17] net: Add support for Power over Ethernet (PoE)

[Jamal Hadi Salim]

On Tue, Feb 27, 2024 at 9:43 AM Kory Maincent <kory.maincent@bootlin.com> wrote:
>
> This patch series aims at adding support for PoE (Power over Ethernet),
> based on the already existing support for PoDL (Power over Data Line)
> implementation. In addition, it adds support for two specific PoE
> controller, the Microchip PD692x0 and the TI TPS23881.
>
> This patch series is sponsored by Dent Project
> <dentproject@linuxfoundation.org>.

Sorry, couldnt resist because it sounded like a commercial;-> And
likely i am out of touch. I am all for giving credit but does it have
to be explicitly called out as "this patch is sponsored by X"?

cheers,
jamal


> In detail:
> - Patch 1 to 13 prepare net to support PoE devices.
> - Patch 14 and 15 add PD692x0 PoE PSE controller driver and its binding.
> - Patch 16 and 17 add TI TPS23881 PSE controller driver and its binding.
>
> Changes in v5:
> - Fix bindings nit.
> - Add supported-polarity parameter to bindings.
> - Fix yamllint binding errors.
> - Remove the nested lock brought by the use of regulator framework.
> - Link to v4: https://lore.kernel.org/r/20240215-feature_poe-v4-0-35bb4c23266c@bootlin.com
>
> Changes in v4:
> - Replaced sponsored-by tag by a simple sentence.
> - Fix pse_pi node bindings.
> - Add pse pi documentation written by Oleksij.
> - Link to v3: https://lore.kernel.org/r/20240208-feature_poe-v3-0-531d2674469e@bootlin.com
>
> Changes in v3:
> - Add patches to add Oleksij and myself to PSE MAINTAINERS.
> - Add patches to add pse devlink.
> - Add TI TPS23881 PSE controller driver with its binding.
> - Replace pse_get_types helper by pse_has_podl and pse_has_c33
> - Changed the PSE core bindings.
> - Add a setup_pi_matrix callback.
> - Register regulator for each PSE PI (Power Interface).
> - Changed the PD692x0 bindings.
> - Updated PD692x0 drivers to new bindings and PSE PI description.
> - Updated PD692x0 drivers according to the reviews and made fixes.
> - Link to v2: https://lore.kernel.org/r/20231201-feature_poe-v2-0-56d8cac607fa@bootlin.com
>
> Changes in v2:
> - Extract "firmware_loader: Expand Firmware upload error codes patches" to
>   send it alone and get it merge in an immutable branch.
> - Add "c33" prefix for PoE variables and enums.
> - Enhance few comments.
> - Add PSE Documentation.
> - Make several changes in pd692x0 driver, mainly for readibility.
> - Link to v1: https://lore.kernel.org/r/20231116-feature_poe-v1-0-be48044bf249@bootlin.com
>
> Signed-off-by: Kory Maincent <kory.maincent@bootlin.com>
> ---
> Kory Maincent (17):
>       MAINTAINERS: net: Add Oleksij to pse-pd maintainers
>       of: property: Add fw_devlink support for pse parent
>       net: pse-pd: Rectify and adapt the naming of admin_cotrol member of struct pse_control_config
>       ethtool: Expand Ethernet Power Equipment with c33 (PoE) alongside PoDL
>       net: pse-pd: Introduce PSE types enumeration
>       net: ethtool: pse-pd: Expand pse commands with the PSE PoE interface
>       netlink: specs: Modify pse attribute prefix
>       netlink: specs: Expand the pse netlink command with PoE interface
>       MAINTAINERS: Add myself to pse networking maintainer
>       net: pse-pd: Add support for PSE PIs
>       dt-bindings: net: pse-pd: Add another way of describing several PSE PIs
>       net: pse-pd: Add support for setup_pi_matrix callback
>       net: pse-pd: Use regulator framework within PSE framework
>       dt-bindings: net: pse-pd: Add bindings for PD692x0 PSE controller
>       net: pse-pd: Add PD692x0 PSE controller driver
>       dt-bindings: net: pse-pd: Add bindings for TPS23881 PSE controller
>       net: pse-pd: Add TI TPS23881 PSE controller driver
>
>  .../bindings/net/pse-pd/microchip,pd692x0.yaml     |  158 +++
>  .../bindings/net/pse-pd/pse-controller.yaml        |  100 +-
>  .../bindings/net/pse-pd/ti,tps23881.yaml           |   93 ++
>  Documentation/netlink/specs/ethtool.yaml           |   33 +-
>  Documentation/networking/ethtool-netlink.rst       |   20 +
>  Documentation/networking/index.rst                 |    1 +
>  Documentation/networking/pse-pd/index.rst          |   10 +
>  Documentation/networking/pse-pd/introduction.rst   |   73 ++
>  Documentation/networking/pse-pd/pse-pi.rst         |  302 +++++
>  MAINTAINERS                                        |    8 +
>  drivers/net/mdio/fwnode_mdio.c                     |   29 +-
>  drivers/net/pse-pd/Kconfig                         |   20 +
>  drivers/net/pse-pd/Makefile                        |    2 +
>  drivers/net/pse-pd/pd692x0.c                       | 1223 ++++++++++++++++++++
>  drivers/net/pse-pd/pse_core.c                      |  429 ++++++-
>  drivers/net/pse-pd/pse_regulator.c                 |   49 +-
>  drivers/net/pse-pd/tps23881.c                      |  818 +++++++++++++
>  drivers/of/property.c                              |    2 +
>  include/linux/pse-pd/pse.h                         |   86 +-
>  include/uapi/linux/ethtool.h                       |   55 +
>  include/uapi/linux/ethtool_netlink.h               |    3 +
>  net/ethtool/pse-pd.c                               |   60 +-
>  22 files changed, 3451 insertions(+), 123 deletions(-)
> ---
> base-commit: f308eae1e1cdacca3cef65c7f4f691dfcb0c8976
> change-id: 20231024-feature_poe-139490e73403
>
> Best regards,
> --
> Köry Maincent, Bootlin
> Embedded Linux and kernel engineering
> https://bootlin.com
>
>

Re: [PATCH net-next v5 13/17] net: pse-pd: Use regulator framework within PSE framework

[Jakub Kicinski]

On Tue, 27 Feb 2024 15:42:55 +0100 Kory Maincent wrote:
> +	psec->ps = devm_regulator_get_exclusive(dev,
> +						rdev_get_name(pcdev->pi[index].rdev));
> +	if (IS_ERR(psec->ps)) {
> +		kfree(psec);
> +		return ERR_CAST(psec->ps);

coccinelle says: ERROR: reference preceded by free on line 458
-- 
pw-bot: cr

Re: [PATCH net-next v5 13/17] net: pse-pd: Use regulator framework within PSE framework

[Simon Horman]

On Tue, Feb 27, 2024 at 03:42:55PM +0100, Kory Maincent wrote:

...

> diff --git a/include/linux/pse-pd/pse.h b/include/linux/pse-pd/pse.h
> index 522115cc6cef..a3e297cc2150 100644
> --- a/include/linux/pse-pd/pse.h
> +++ b/include/linux/pse-pd/pse.h
> @@ -55,10 +55,10 @@ struct pse_controller_ops {
>  	int (*ethtool_get_status)(struct pse_controller_dev *pcdev,
>  		unsigned long id, struct netlink_ext_ack *extack,
>  		struct pse_control_status *status);
> -	int (*ethtool_set_config)(struct pse_controller_dev *pcdev,
> -		unsigned long id, struct netlink_ext_ack *extack,
> -		const struct pse_control_config *config);
>  	int (*setup_pi_matrix)(struct pse_controller_dev *pcdev);
> +	int (*pi_is_enabled)(struct pse_controller_dev *pcdev, int id);
> +	int (*pi_enable)(struct pse_controller_dev *pcdev, int id);
> +	int (*pi_disable)(struct pse_controller_dev *pcdev, int id);

Hi Kory,

Please update the Kernel doc for struct pse_controller_ops to reflect the
added and removed fields.

>  };
>  
>  struct module;
> @@ -90,10 +90,14 @@ struct pse_pi_pairset {
>   *
>   * @pairset: table of the PSE PI pinout alternative for the two pairset
>   * @np: device node pointer of the PSE PI node
> + * @rdev: regulator represented by the PSE PI
> + * @enabled: PI enabled state
>   */
>  struct pse_pi {
>  	struct pse_pi_pairset pairset[2];
>  	struct device_node *np;
> +	struct regulator_dev *rdev;
> +	bool enabled;
>  };
>  
>  /**
> @@ -107,6 +111,8 @@ struct pse_pi {
>   * @of_pse_n_cells: number of cells in PSE line specifiers
>   * @nr_lines: number of PSE controls in this controller device
>   * @lock: Mutex for serialization access to the PSE controller
> + * @lock_owner: current owner of the mutex
> + * @ref_cnt: mutex's reference count

These newly documented fields don't seem to exist in struct
pse_controller_dev. Perhaps this is an left over from earlier development?

>   * @types: types of the PSE controller
>   * @pi: table of PSE PIs described in this controller device
>   * @of_legacy: flag set if the pse_pis devicetree node is not used
> @@ -132,7 +138,8 @@ struct device;
>  int devm_pse_controller_register(struct device *dev,
>  				 struct pse_controller_dev *pcdev);
>  
> -struct pse_control *of_pse_control_get(struct device_node *node);
> +struct pse_control *of_pse_control_get(struct device *dev,
> +				       struct device_node *node);
>  void pse_control_put(struct pse_control *psec);
>  
>  int pse_ethtool_get_status(struct pse_control *psec,
> @@ -147,7 +154,8 @@ bool pse_has_c33(struct pse_control *psec);
>  
>  #else
>  
> -static inline struct pse_control *of_pse_control_get(struct device_node *node)
> +static inline struct pse_control *of_pse_control_get(struct device *dev,
> +						     struct device_node *node)
>  {
>  	return ERR_PTR(-ENOENT);
>  }
> 
> -- 
> 2.25.1
> 
> 

Re: [PATCH net-next v5 17/17] net: pse-pd: Add TI TPS23881 PSE controller driver

[Simon Horman]

On Tue, Feb 27, 2024 at 03:42:59PM +0100, Kory Maincent wrote:
> Add a new driver for the TI TPS23881 I2C Power Sourcing Equipment
> controller.
> 
> This patch is sponsored by Dent Project <dentproject@linuxfoundation.org>.
> 
> Signed-off-by: Kory Maincent <kory.maincent@bootlin.com>

...

> +static int tps23881_flash_fw_part(struct i2c_client *client,
> +				  const char *fw_name,
> +				  const struct tps23881_fw_conf *fw_conf)
> +{
> +	const struct firmware *fw = NULL;
> +	int i, ret;
> +
> +	ret = request_firmware(&fw, fw_name, &client->dev);
> +	if (ret)
> +		return ret;
> +
> +	dev_info(&client->dev, "Flashing %s\n", fw_name);
> +
> +	/* Prepare device for RAM download */
> +	while (fw_conf->reg) {
> +		ret = i2c_smbus_write_byte_data(client, fw_conf->reg,
> +						fw_conf->val);
> +		if (ret < 0)

Hi Kory,

Should fw be released here.

> +			return ret;
> +
> +		fw_conf++;
> +	}
> +
> +	/* Flash the firmware file */
> +	for (i = 0; i < fw->size; i++) {
> +		ret = i2c_smbus_write_byte_data(client,
> +						TPS23881_REG_SRAM_DATA,
> +						fw->data[i]);
> +		if (ret < 0)

And here?

Flagged by Smatch.

> +			return ret;
> +	}
> +
> +	release_firmware(fw);
> +
> +	return 0;
> +}

...

Re: [PATCH net-next v5 11/17] dt-bindings: net: pse-pd: Add another way of describing several PSE PIs

[Rob Herring]

On Tue, 27 Feb 2024 15:42:53 +0100, Kory Maincent wrote:
> PSE PI setup may encompass multiple PSE controllers or auxiliary circuits
> that collectively manage power delivery to one Ethernet port.
> Such configurations might support a range of PoE standards and require
> the capability to dynamically configure power delivery based on the
> operational mode (e.g., PoE2 versus PoE4) or specific requirements of
> connected devices. In these instances, a dedicated PSE PI node becomes
> essential for accurately documenting the system architecture. This node
> would serve to detail the interactions between different PSE controllers,
> the support for various PoE modes, and any additional logic required to
> coordinate power delivery across the network infrastructure.
> 
> The old usage of "#pse-cells" is unsuficient as it carries only the PSE PI
> index information.
> 
> This patch is sponsored by Dent Project <dentproject@linuxfoundation.org>.
> 
> Signed-off-by: Kory Maincent <kory.maincent@bootlin.com>
> ---
> 
> Changes in v3:
> - New patch
> 
> Changes in v4:
> - Remove $def
> - Fix pairset-names item list
> - Upgrade few properties description
> - Update the commit message
> 
> Changes in v5:
> - Fix yamllint error.
> - Replace underscore by dash in properties names.
> - Add polarity-supported property.
> ---
>  .../bindings/net/pse-pd/pse-controller.yaml        | 100 ++++++++++++++++++++-
>  1 file changed, 97 insertions(+), 3 deletions(-)
> 

My bot found errors running 'make DT_CHECKER_FLAGS=-m dt_binding_check'
on your patch (DT_CHECKER_FLAGS is new in v5.13):

yamllint warnings/errors:
./Documentation/devicetree/bindings/net/pse-pd/pse-controller.yaml:86:111: [warning] line too long (111 > 110 characters) (line-length)
./Documentation/devicetree/bindings/net/pse-pd/pse-controller.yaml:88:111: [warning] line too long (111 > 110 characters) (line-length)
./Documentation/devicetree/bindings/net/pse-pd/pse-controller.yaml:89:111: [warning] line too long (111 > 110 characters) (line-length)
./Documentation/devicetree/bindings/net/pse-pd/pse-controller.yaml:90:111: [warning] line too long (111 > 110 characters) (line-length)
./Documentation/devicetree/bindings/net/pse-pd/pse-controller.yaml:91:111: [warning] line too long (111 > 110 characters) (line-length)
./Documentation/devicetree/bindings/net/pse-pd/pse-controller.yaml:92:111: [warning] line too long (111 > 110 characters) (line-length)
./Documentation/devicetree/bindings/net/pse-pd/pse-controller.yaml:93:111: [warning] line too long (111 > 110 characters) (line-length)
./Documentation/devicetree/bindings/net/pse-pd/pse-controller.yaml:94:111: [warning] line too long (111 > 110 characters) (line-length)
./Documentation/devicetree/bindings/net/pse-pd/pse-controller.yaml:95:111: [warning] line too long (111 > 110 characters) (line-length)

dtschema/dtc warnings/errors:

doc reference errors (make refcheckdocs):
Warning: Documentation/devicetree/bindings/net/pse-pd/pse-controller.yaml references a file that doesn't exist: Documentation/networking/pse-pd/pse-pi.rst
Documentation/devicetree/bindings/net/pse-pd/pse-controller.yaml: Documentation/networking/pse-pd/pse-pi.rst

See https://patchwork.ozlabs.org/project/devicetree-bindings/patch/20240227-feature_poe-v5-11-28f0aa48246d@bootlin.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.

Re: [PATCH net-next v5 13/17] net: pse-pd: Use regulator framework within PSE framework

[Köry Maincent]

On Wed, 28 Feb 2024 12:48:01 +0000
Simon Horman <horms@kernel.org> wrote:

> On Tue, Feb 27, 2024 at 03:42:55PM +0100, Kory Maincent wrote:
> 
> ...
> 
> > diff --git a/include/linux/pse-pd/pse.h b/include/linux/pse-pd/pse.h
> > index 522115cc6cef..a3e297cc2150 100644
> > --- a/include/linux/pse-pd/pse.h
> > +++ b/include/linux/pse-pd/pse.h
> > @@ -55,10 +55,10 @@ struct pse_controller_ops {
> >  	int (*ethtool_get_status)(struct pse_controller_dev *pcdev,
> >  		unsigned long id, struct netlink_ext_ack *extack,
> >  		struct pse_control_status *status);
> > -	int (*ethtool_set_config)(struct pse_controller_dev *pcdev,
> > -		unsigned long id, struct netlink_ext_ack *extack,
> > -		const struct pse_control_config *config);
> >  	int (*setup_pi_matrix)(struct pse_controller_dev *pcdev);
> > +	int (*pi_is_enabled)(struct pse_controller_dev *pcdev, int id);
> > +	int (*pi_enable)(struct pse_controller_dev *pcdev, int id);
> > +	int (*pi_disable)(struct pse_controller_dev *pcdev, int id);  
> 
> Hi Kory,
> 
> Please update the Kernel doc for struct pse_controller_ops to reflect the
> added and removed fields.

Hello Simon,
Sorry I totally forgot to update the kernel doc on that patch.

Regards,
-- 
Köry Maincent, Bootlin
Embedded Linux and kernel engineering
https://bootlin.com

Re: [PATCH net-next v5 13/17] net: pse-pd: Use regulator framework within PSE framework

[Köry Maincent]

On Tue, 27 Feb 2024 16:56:59 -0800
Jakub Kicinski <kuba@kernel.org> wrote:

> On Tue, 27 Feb 2024 15:42:55 +0100 Kory Maincent wrote:
> > +	psec->ps = devm_regulator_get_exclusive(dev,
> > +
> > rdev_get_name(pcdev->pi[index].rdev));
> > +	if (IS_ERR(psec->ps)) {
> > +		kfree(psec);
> > +		return ERR_CAST(psec->ps);  
> 
> coccinelle says: ERROR: reference preceded by free on line 458

Ouch, indeed, missed this error.

Regards,
-- 
Köry Maincent, Bootlin
Embedded Linux and kernel engineering
https://bootlin.com

Re: [PATCH net-next v5 17/17] net: pse-pd: Add TI TPS23881 PSE controller driver

[Köry Maincent]

On Wed, 28 Feb 2024 12:53:44 +0000
Simon Horman <horms@kernel.org> wrote:

> On Tue, Feb 27, 2024 at 03:42:59PM +0100, Kory Maincent wrote:
> > Add a new driver for the TI TPS23881 I2C Power Sourcing Equipment
> > controller.
> > 
> > This patch is sponsored by Dent Project <dentproject@linuxfoundation.org>.
> > 
> > Signed-off-by: Kory Maincent <kory.maincent@bootlin.com>  
> 
> ...
> 
> > +static int tps23881_flash_fw_part(struct i2c_client *client,
> > +				  const char *fw_name,
> > +				  const struct tps23881_fw_conf *fw_conf)
> > +{
> > +	const struct firmware *fw = NULL;
> > +	int i, ret;
> > +
> > +	ret = request_firmware(&fw, fw_name, &client->dev);
> > +	if (ret)
> > +		return ret;
> > +
> > +	dev_info(&client->dev, "Flashing %s\n", fw_name);
> > +
> > +	/* Prepare device for RAM download */
> > +	while (fw_conf->reg) {
> > +		ret = i2c_smbus_write_byte_data(client, fw_conf->reg,
> > +						fw_conf->val);
> > +		if (ret < 0)  
> 
> Hi Kory,
> 
> Should fw be released here.

Hello Simon,

Indeed I have missed it, thanks. 

-- 
Köry Maincent, Bootlin
Embedded Linux and kernel engineering
https://bootlin.com

Re: [PATCH net-next v5 10/17] net: pse-pd: Add support for PSE PIs

[Oleksij Rempel]

Hi Kory,

On Tue, Feb 27, 2024 at 03:42:52PM +0100, Kory Maincent wrote:
....

> diff --git a/drivers/net/pse-pd/pse_core.c b/drivers/net/pse-pd/pse_core.c
> index fed006cbc185..9124eb3d6492 100644
> --- a/drivers/net/pse-pd/pse_core.c
> +++ b/drivers/net/pse-pd/pse_core.c
> @@ -27,38 +27,137 @@ struct pse_control {
>  	struct kref refcnt;
>  };
>  
> -/**
> - * of_pse_zero_xlate - dummy function for controllers with one only control
> - * @pcdev: a pointer to the PSE controller device
> - * @pse_spec: PSE line specifier as found in the device tree
> - *
> - * This static translation function is used by default if of_xlate in
> - * :c:type:`pse_controller_dev` is not set. It is useful for all PSE
> - * controllers with #pse-cells = <0>.
> - */

Please replace documentation

> -static int of_pse_zero_xlate(struct pse_controller_dev *pcdev,
> -			     const struct of_phandle_args *pse_spec)
> +static int of_load_pse_pi_pairsets(struct device_node *node,
> +				   struct pse_pi *pi,
> +				   int npairsets)
>  {
> -	return 0;
> +	struct device_node *pairset_np;
> +	const char *name;
> +	int i, ret;
> +
> +	for (i = 0; i < npairsets; i++) {

please move this scope to a separate function.

> +		ret = of_property_read_string_index(node,
> +						    "pairset-names",
> +						     i, &name);
> +		if (ret)
> +			break;
> +
> +		if (strcmp(name, "alternative-a")) {

strcmp returns 0 if it matching

		if (!strcmp(name, "alternative-a")) {


> +			pi->pairset[i].pinout = ALTERNATIVE_A;
> +		} else if (strcmp(name, "alternative-b")) {

		if (!strcmp(name, "alternative-a")) {

> +			pi->pairset[i].pinout = ALTERNATIVE_B;
> +		} else {
> +			pr_err("pse: wrong pairset-names value %s\n", name);
> +			ret = -EINVAL;
> +			break;
> +		}
> +
> +		pairset_np = of_parse_phandle(node, "pairsets", i);
> +		if (!pairset_np) {
> +			ret = -ENODEV;
> +			break;
> +		}
> +
> +		pi->pairset[i].np = pairset_np;
> +	}
> +
> +	if (i == 2 && pi->pairset[0].pinout == pi->pairset[1].pinout) {
> +		pr_err("pse: two PI pairsets can not have identical pinout");
> +		ret = -EINVAL;
> +	}
> +
> +	/* If an error appears on the second pairset load, release the first
> +	 * pairset device node kref
> +	 */
> +	if (ret) {
> +		of_node_put(pi->pairset[0].np);
> +		pi->pairset[0].np = NULL;
> +		of_node_put(pi->pairset[1].np);
> +		pi->pairset[1].np = NULL;
> +	}
> +
> +	return ret;
>  }
>  
> -/**
> - * of_pse_simple_xlate - translate pse_spec to the PSE line number
> - * @pcdev: a pointer to the PSE controller device
> - * @pse_spec: PSE line specifier as found in the device tree
> - *
> - * This static translation function is used by default if of_xlate in
> - * :c:type:`pse_controller_dev` is not set. It is useful for all PSE
> - * controllers with 1:1 mapping, where PSE lines can be indexed by number
> - * without gaps.
> - */

Please replace documentation

> -static int of_pse_simple_xlate(struct pse_controller_dev *pcdev,
> -			       const struct of_phandle_args *pse_spec)
> +static int of_load_pse_pis(struct pse_controller_dev *pcdev)
>  {
> -	if (pse_spec->args[0] >= pcdev->nr_lines)
> -		return -EINVAL;
> +	struct device_node *np = pcdev->dev->of_node;
> +	struct device_node *node, *pis;
> +	int ret, i;
>  
> -	return pse_spec->args[0];
> +	if (!np)
> +		return -ENODEV;
> +
> +	pcdev->pi = kcalloc(pcdev->nr_lines, sizeof(*pcdev->pi), GFP_KERNEL);
> +	if (!pcdev->pi)
> +		return -ENOMEM;
> +
> +	pis = of_get_child_by_name(np, "pse-pis");
> +	if (!pis) {

Do we need to allocate pcdev->pi if there are no pse-pis?

> +		/* Legacy OF description of PSE PIs */
> +		pcdev->of_legacy = true;

It is not "legacy" :) PoDL do not providing definition of PSE PI since there
is only one pair. May be: single_pair, no_pse_pi or any other idea.

> +		return 0;
> +	}
> +
> +	for_each_child_of_node(pis, node) {

please move this scope to a separate function.

> +		struct pse_pi pi = {0};
> +		int npairsets;
> +		u32 id;
> +
> +		if (!of_node_name_eq(node, "pse-pi"))
> +			continue;
> +
> +		ret = of_property_read_u32(node, "reg", &id);
> +		if (ret)

error: can't get "reg" property for node "%s"

> +			goto out;
> +
> +		if (id >= pcdev->nr_lines || pcdev->pi[id].np) {

Here two different kind of errors:
- (id >= pcdev->nr_lines) reg value is out of range. print value and max
  range.
- (pcdev->pi[id].np) other node with same reg value was already
  registered... print both node names.

> +			dev_err(pcdev->dev, "wrong id of pse pi: %u\n",
> +				id);
> +			ret = -EINVAL;
> +			goto out;
> +		}
> +
> +		ret = of_property_count_strings(node, "pairset-names");
> +		if (ret <= 0)

if (ret < 0)
   error: can't get "pairset-names" property: %pe
if (ret < 1 || ret > 2)
   error: wrong number of pairset-names. Should be 1 or 2, got %i

> +			goto out;
> +		npairsets = ret;
> +
> +		ret = of_count_phandle_with_args(node, "pairsets", NULL);
> +		if (ret <= 0)

same as for pairset-names

> +			goto out;
> +
> +		/* npairsets is limited to value one or two */
> +		if (ret != npairsets || ret > 2) {

(ret > 2) will be handled by previous checks
(ret != npairsets) amount of pairsets and pairset-names is not equal %i
!= %i

> +			dev_err(pcdev->dev,
> +				"wrong number of pairsets or pairset-names for pse pi %d\n",
> +				id);
> +			ret = -EINVAL;
> +			goto out;
> +		}
> +
> +		ret = of_load_pse_pi_pairsets(node, &pi, npairsets);
> +		if (ret)
> +			goto out;
> +
> +		of_node_get(node);
> +		pi.np = node;
> +		memcpy(&pcdev->pi[id], &pi, sizeof(pi));
> +	}
> +
> +	of_node_put(pis);
> +	return 0;
> +
> +out:
> +	for (i = 0; i <= pcdev->nr_lines; i++) {
> +		of_node_put(pcdev->pi[i].pairset[0].np);
> +		of_node_put(pcdev->pi[i].pairset[1].np);
> +		of_node_put(pcdev->pi[i].np);
> +	}
> +	of_node_put(node);
> +	of_node_put(pis);
> +	kfree(pcdev->pi);
> +	return ret;
>  }
>  
>  /**
> @@ -67,16 +166,18 @@ static int of_pse_simple_xlate(struct pse_controller_dev *pcdev,
>   */
>  int pse_controller_register(struct pse_controller_dev *pcdev)
>  {
> -	if (!pcdev->of_xlate) {
> -		if (pcdev->of_pse_n_cells == 0)
> -			pcdev->of_xlate = of_pse_zero_xlate;
> -		else if (pcdev->of_pse_n_cells == 1)
> -			pcdev->of_xlate = of_pse_simple_xlate;
> -	}
> +	int ret;
>  
>  	mutex_init(&pcdev->lock);
>  	INIT_LIST_HEAD(&pcdev->pse_control_head);
>  
> +	if (!pcdev->nr_lines)
> +		pcdev->nr_lines = 1;
> +
> +	ret = of_load_pse_pis(pcdev);
> +	if (ret)
> +		return ret;
> +
>  	mutex_lock(&pse_list_mutex);
>  	list_add(&pcdev->list, &pse_controller_list);
>  	mutex_unlock(&pse_list_mutex);
> @@ -91,6 +192,14 @@ EXPORT_SYMBOL_GPL(pse_controller_register);
>   */
>  void pse_controller_unregister(struct pse_controller_dev *pcdev)
>  {
> +	int i;
> +
> +	for (i = 0; i <= pcdev->nr_lines; i++) {
> +		of_node_put(pcdev->pi[i].pairset[0].np);
> +		of_node_put(pcdev->pi[i].pairset[1].np);
> +		of_node_put(pcdev->pi[i].np);
> +	}
> +	kfree(pcdev->pi);

Same pattern was already used. It is better to move it to a separate
function.

>  	mutex_lock(&pse_list_mutex);
>  	list_del(&pcdev->list);
>  	mutex_unlock(&pse_list_mutex);
> @@ -203,8 +312,33 @@ pse_control_get_internal(struct pse_controller_dev *pcdev, unsigned int index)
>  	return psec;
>  }
>  
> -struct pse_control *
> -of_pse_control_get(struct device_node *node)
> +static int of_pse_match_pi(struct pse_controller_dev *pcdev,
> +			   struct device_node *np)
> +{
> +	int i;
> +
> +	for (i = 0; i <= pcdev->nr_lines; i++) {
> +		if (pcdev->pi[i].np == np)
> +			return i;
> +	}
> +
> +	return -EINVAL;
> +}
> +
> +static int psec_id_legacy_xlate(struct pse_controller_dev *pcdev,
> +				const struct of_phandle_args *pse_spec)

rename legacy to some other name in all places.

> +{
> +	if (!pcdev->of_pse_n_cells)
> +		return 0;
> +
> +	if (pcdev->of_pse_n_cells > 1 ||
> +	    pse_spec->args[0] >= pcdev->nr_lines)
> +		return -EINVAL;
> +
> +	return pse_spec->args[0];
> +}
> +
> +struct pse_control *of_pse_control_get(struct device_node *node)
>  {
>  	struct pse_controller_dev *r, *pcdev;
>  	struct of_phandle_args args;
> @@ -222,7 +356,14 @@ of_pse_control_get(struct device_node *node)
>  	mutex_lock(&pse_list_mutex);
>  	pcdev = NULL;
>  	list_for_each_entry(r, &pse_controller_list, list) {
> -		if (args.np == r->dev->of_node) {
> +		if (!r->of_legacy) {
> +			ret = of_pse_match_pi(r, args.np);
> +			if (ret >= 0) {
> +				pcdev = r;
> +				psec_id = ret;
> +				break;
> +			}
> +		} else if (args.np == r->dev->of_node) {
>  			pcdev = r;
>  			break;
>  		}
> @@ -238,10 +379,12 @@ of_pse_control_get(struct device_node *node)
>  		goto out;
>  	}
>  
> -	psec_id = pcdev->of_xlate(pcdev, &args);
> -	if (psec_id < 0) {
> -		psec = ERR_PTR(psec_id);
> -		goto out;
> +	if (pcdev->of_legacy) {
> +		psec_id = psec_id_legacy_xlate(pcdev, &args);
> +		if (psec_id < 0) {
> +			psec = ERR_PTR(psec_id);
> +			goto out;
> +		}
>  	}
>  
>  	/* pse_list_mutex also protects the pcdev's pse_control list */
> diff --git a/include/linux/pse-pd/pse.h b/include/linux/pse-pd/pse.h
> index 19589571157f..01b3b9adfe2a 100644
> --- a/include/linux/pse-pd/pse.h
> +++ b/include/linux/pse-pd/pse.h
> @@ -64,6 +64,36 @@ struct device_node;
>  struct of_phandle_args;
>  struct pse_control;
>  
> +/* PSE PI pairset pinout can either be Alternative A or Alternative B */
> +enum pse_pi_pairset_pinout {
> +	ALTERNATIVE_A,
> +	ALTERNATIVE_B,
> +};
> +
> +/**
> + * struct pse_pi_pairset - PSE PI pairset entity describing the pinout
> + *			   alternative ant its phandle
> + *
> + * @pinout: description of the pinout alternative
> + * @np: device node pointer describing the pairset phandle
> + */
> +struct pse_pi_pairset {
> +	enum pse_pi_pairset_pinout pinout;
> +	struct device_node *np;
> +};
> +
> +/**
> + * struct pse_pi - PSE PI (Power Interface) entity as described in
> + *		   IEEE 802.3-2022 145.2.4
> + *
> + * @pairset: table of the PSE PI pinout alternative for the two pairset
> + * @np: device node pointer of the PSE PI node
> + */
> +struct pse_pi {
> +	struct pse_pi_pairset pairset[2];
> +	struct device_node *np;
> +};
> +
>  /**
>   * struct pse_controller_dev - PSE controller entity that might
>   *                             provide multiple PSE controls
> @@ -73,11 +103,11 @@ struct pse_control;
>   * @pse_control_head: head of internal list of requested PSE controls
>   * @dev: corresponding driver model device struct
>   * @of_pse_n_cells: number of cells in PSE line specifiers
> - * @of_xlate: translation function to translate from specifier as found in the
> - *            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
> + * @pi: table of PSE PIs described in this controller device
> + * @of_legacy: flag set if the pse_pis devicetree node is not used
>   */
>  struct pse_controller_dev {
>  	const struct pse_controller_ops *ops;
> @@ -86,11 +116,11 @@ struct pse_controller_dev {
>  	struct list_head pse_control_head;
>  	struct device *dev;
>  	int of_pse_n_cells;
> -	int (*of_xlate)(struct pse_controller_dev *pcdev,
> -			const struct of_phandle_args *pse_spec);
>  	unsigned int nr_lines;
>  	struct mutex lock;
>  	enum ethtool_pse_types types;
> +	struct pse_pi *pi;
> +	bool of_legacy;
>  };
>  
>  #if IS_ENABLED(CONFIG_PSE_CONTROLLER)

Regards,
Oleksij
-- 
Pengutronix e.K.                           |                             |
Steuerwalder Str. 21                       | http://www.pengutronix.de/  |
31137 Hildesheim, Germany                  | Phone: +49-5121-206917-0    |
Amtsgericht Hildesheim, HRA 2686           | Fax:   +49-5121-206917-5555 |

Re: [PATCH net-next v5 10/17] net: pse-pd: Add support for PSE PIs

[Köry Maincent]

Hello Oleskij,

Thanks you for the review.

On Fri, 1 Mar 2024 15:24:07 +0100
Oleksij Rempel <o.rempel@pengutronix.de> wrote:

> > -static int of_pse_simple_xlate(struct pse_controller_dev *pcdev,
> > -			       const struct of_phandle_args *pse_spec)
> > +static int of_load_pse_pis(struct pse_controller_dev *pcdev)
> >  {
> > -	if (pse_spec->args[0] >= pcdev->nr_lines)
> > -		return -EINVAL;
> > +	struct device_node *np = pcdev->dev->of_node;
> > +	struct device_node *node, *pis;
> > +	int ret, i;
> >  
> > -	return pse_spec->args[0];
> > +	if (!np)
> > +		return -ENODEV;
> > +
> > +	pcdev->pi = kcalloc(pcdev->nr_lines, sizeof(*pcdev->pi),
> > GFP_KERNEL);
> > +	if (!pcdev->pi)
> > +		return -ENOMEM;
> > +
> > +	pis = of_get_child_by_name(np, "pse-pis");
> > +	if (!pis) {  
> 
> Do we need to allocate pcdev->pi if there are no pse-pis?

In fact it is not needed in this patch but in the patch 13 which use regulator
framework, as the regulator is described on each pi structure.

I will update them accordingly.

> > +		/* Legacy OF description of PSE PIs */
> > +		pcdev->of_legacy = true;  
> 
> It is not "legacy" :) PoDL do not providing definition of PSE PI since there
> is only one pair. May be: single_pair, no_pse_pi or any other idea.

You right it is not needed for PoDL. Maybe no_pse_pi is better according to the
following thoughts.

Just wondering, how a pse controller that support PoE and PoDL simultaneously
would be exposed in the binding. In that case I suppose all the PIs (PoE and
PoDL) need to use the pse-pi subnode. Then the "alternative pinout" and
"polarity" parameter would not be requested for PoDL PIs.

> > +			dev_err(pcdev->dev, "wrong id of pse pi: %u\n",
> > +				id);
> > +			ret = -EINVAL;
> > +			goto out;
> > +		}
> > +
> > +		ret = of_property_count_strings(node, "pairset-names");
> > +		if (ret <= 0)  
> 
> if (ret < 0)
>    error: can't get "pairset-names" property: %pe
> if (ret < 1 || ret > 2)
>    error: wrong number of pairset-names. Should be 1 or 2, got %i

Need to modify this to be able to have PoDL PIs without pairset description.

Regards,
-- 
Köry Maincent, Bootlin
Embedded Linux and kernel engineering
https://bootlin.com

Re: [PATCH net-next v5 10/17] net: pse-pd: Add support for PSE PIs

[Oleksij Rempel]

Hay Köry,

On Fri, Mar 01, 2024 at 05:10:05PM +0100, Köry Maincent wrote:
> Hello Oleskij,
> 
> Thanks you for the review.

I'll try to review more at weekend.

> > > +		/* Legacy OF description of PSE PIs */
> > > +		pcdev->of_legacy = true;  
> > 
> > It is not "legacy" :) PoDL do not providing definition of PSE PI since there
> > is only one pair. May be: single_pair, no_pse_pi or any other idea.
> 
> You right it is not needed for PoDL. Maybe no_pse_pi is better according to the
> following thoughts.
> 
> Just wondering, how a pse controller that support PoE and PoDL simultaneously
> would be exposed in the binding. In that case I suppose all the PIs (PoE and
> PoDL) need to use the pse-pi subnode. Then the "alternative pinout" and
> "polarity" parameter would not be requested for PoDL PIs.

In case of hybrid device I would expect that we will have an 4 pair
connector where only one pair will be used. In this case we will need to
know what pair and polarity is supported or can be configured for PoDL.
It will be full blown PSE PI node with PoDL specific extras.

Don't worry about it right now.

Regards,
Oleksij
-- 
Pengutronix e.K.                           |                             |
Steuerwalder Str. 21                       | http://www.pengutronix.de/  |
31137 Hildesheim, Germany                  | Phone: +49-5121-206917-0    |
Amtsgericht Hildesheim, HRA 2686           | Fax:   +49-5121-206917-5555 |

Re: [PATCH net-next v5 13/17] net: pse-pd: Use regulator framework within PSE framework

[Oleksij Rempel]

On Tue, Feb 27, 2024 at 03:42:55PM +0100, Kory Maincent wrote:
> Integrate the regulator framework to the PSE framework for enhanced
> access to features such as voltage, power measurement, and limits, which
> are akin to regulators. Additionally, PSE features like port priorities
> could potentially enhance the regulator framework. Note that this
> integration introduces some implementation complexity, including wrapper
> callbacks and nested locks, but the potential benefits make it worthwhile.
> 
> Regulator are using enable counter with specific behavior.
> Two calls to regulator_disable will trigger kernel warnings.
> If the counter exceeds one, regulator_disable call won't disable the
> PSE PI. These behavior isn't suitable for PSE control.
> Added a boolean 'enabled' state to prevent multiple calls to

Please rename rename "enabled" to "admin_state_enabled". This variable
do not reflect real device state, it reflects only user configuration.

...  
> @@ -120,15 +118,9 @@ int fwnode_mdiobus_register_phy(struct mii_bus *bus,
>  	u32 phy_id;
>  	int rc;
>  
> -	psec = fwnode_find_pse_control(child);
> -	if (IS_ERR(psec))
> -		return PTR_ERR(psec);
> -
>  	mii_ts = fwnode_find_mii_timestamper(child);
> -	if (IS_ERR(mii_ts)) {
> -		rc = PTR_ERR(mii_ts);
> -		goto clean_pse;
> -	}
> +	if (IS_ERR(mii_ts))
> +		return PTR_ERR(mii_ts);
>  
>  	is_c45 = fwnode_device_is_compatible(child, "ethernet-phy-ieee802.3-c45");
>  	if (is_c45 || fwnode_get_phy_id(child, &phy_id))
> @@ -161,6 +153,12 @@ int fwnode_mdiobus_register_phy(struct mii_bus *bus,
>  			goto clean_phy;
>  	}
>  
> +	psec = dev_find_pse_control(&phy->mdio.dev);
> +	if (IS_ERR(psec)) {
> +		rc = PTR_ERR(psec);
> +		goto unregister_phy;
> +	}
> +

I do not think it is a good idea to make PSE controller depend on
phy->mdio.dev. The only reason why we have fwnode_find_pse_control()
here was the missing port abstraction.

...
> +static int
> +devm_pse_pi_regulator_register(struct pse_controller_dev *pcdev,
> +			       char *name, int id)
> +{
> +	struct regulator_config rconfig = {0};
> +	struct regulator_desc *rdesc;
> +	struct regulator_dev *rdev;
> +
> +	rdesc = devm_kzalloc(pcdev->dev, sizeof(*rdesc), GFP_KERNEL);
> +	if (!rdesc)
> +		return -ENOMEM;
> +
> +	/* Regulator descriptor id have to be the same as its associated
> +	 * PSE PI id for the well functioning of the PSE controls.
> +	 */
> +	rdesc->id = id;
> +	rdesc->name = name;
> +	rdesc->type = REGULATOR_CURRENT;
> +	rdesc->ops = &pse_pi_ops;
> +	rdesc->owner = pcdev->owner;
> +
> +	rconfig.dev = pcdev->dev;
> +	rconfig.driver_data = pcdev;
> +	rconfig.init_data = &pse_pi_initdata;

Please add input supply to track all dependencies:
        if (of_property_present(np, "vin-supply"))                                                                    
	                config->input_supply = "vin";

May be better to make it not optional...

Should be tested, but if, instead of "vin-supply", we will use
"pse-supply" it will make most part of pse_regulator.c obsolete.

....  
> @@ -310,6 +452,20 @@ pse_control_get_internal(struct pse_controller_dev *pcdev, unsigned int index)
>  		return ERR_PTR(-ENODEV);
>  	}
>  
> +	psec->ps = devm_regulator_get_exclusive(dev,
> +						rdev_get_name(pcdev->pi[index].rdev));
> +	if (IS_ERR(psec->ps)) {
> +		kfree(psec);
> +		return ERR_CAST(psec->ps);
> +	}
> +
> +	ret = regulator_is_enabled(psec->ps);
> +	if (ret < 0) {
> +		kfree(psec);
> +		return ERR_PTR(ret);
> +	}
> +	pcdev->pi[index].enabled = ret;

If I see it correctly, it will prevent us to refcount a request from
user space. So, the runtime PM may suspend PI.

> +
>  	psec->pcdev = pcdev;
>  	list_add(&psec->list, &pcdev->pse_control_head);
>  	psec->id = index;
> @@ -344,7 +500,8 @@ static int psec_id_legacy_xlate(struct pse_controller_dev *pcdev,
>  	return pse_spec->args[0];
>  }
>  
> -struct pse_control *of_pse_control_get(struct device_node *node)
> +struct pse_control *of_pse_control_get(struct device *dev,
> +				       struct device_node *node)
>  {
>  	struct pse_controller_dev *r, *pcdev;
>  	struct of_phandle_args args;
> @@ -394,7 +551,7 @@ struct pse_control *of_pse_control_get(struct device_node *node)
>  	}
>  
>  	/* pse_list_mutex also protects the pcdev's pse_control list */
> -	psec = pse_control_get_internal(pcdev, psec_id);
> +	psec = pse_control_get_internal(dev, pcdev, psec_id);
>  
>  out:
>  	mutex_unlock(&pse_list_mutex);
> @@ -443,21 +600,24 @@ int pse_ethtool_set_config(struct pse_control *psec,
>  			   struct netlink_ext_ack *extack,
>  			   const struct pse_control_config *config)
>  {
> -	const struct pse_controller_ops *ops;
> -	int err;
> -
> -	ops = psec->pcdev->ops;
> +	int err = 0;
>  
> -	if (!ops->ethtool_set_config) {
> -		NL_SET_ERR_MSG(extack,
> -			       "PSE driver does not configuration");
> -		return -EOPNOTSUPP;
> +	/* Look at enabled status to not call regulator_enable or
> +	 * regulator_disable twice creating a regulator counter mismatch
> +	 */
> +	switch (config->c33_admin_control) {
> +	case ETHTOOL_C33_PSE_ADMIN_STATE_ENABLED:
> +		if (!psec->pcdev->pi[psec->id].enabled)
> +			err = regulator_enable(psec->ps);
> +		break;
> +	case ETHTOOL_C33_PSE_ADMIN_STATE_DISABLED:
> +		if (psec->pcdev->pi[psec->id].enabled)
> +			err = regulator_disable(psec->ps);
> +		break;
> +	default:
> +		err = -EOPNOTSUPP;
>  	}

This change seems to break PoDL support

> -	mutex_lock(&psec->pcdev->lock);
> -	err = ops->ethtool_set_config(psec->pcdev, psec->id, extack, config);
> -	mutex_unlock(&psec->pcdev->lock);
> -
>  	return err;

Regards,
Oleksij
-- 
Pengutronix e.K.                           |                             |
Steuerwalder Str. 21                       | http://www.pengutronix.de/  |
31137 Hildesheim, Germany                  | Phone: +49-5121-206917-0    |
Amtsgericht Hildesheim, HRA 2686           | Fax:   +49-5121-206917-5555 |

Re: [PATCH net-next v5 13/17] net: pse-pd: Use regulator framework within PSE framework

[Köry Maincent]

Hello Oleksij,

Thanks for your review!!

On Sat, 2 Mar 2024 22:35:52 +0100
Oleksij Rempel <o.rempel@pengutronix.de> wrote:

> On Tue, Feb 27, 2024 at 03:42:55PM +0100, Kory Maincent wrote:
> > Integrate the regulator framework to the PSE framework for enhanced
> > access to features such as voltage, power measurement, and limits, which
> > are akin to regulators. Additionally, PSE features like port priorities
> > could potentially enhance the regulator framework. Note that this
> > integration introduces some implementation complexity, including wrapper
> > callbacks and nested locks, but the potential benefits make it worthwhile.
> > 
> > Regulator are using enable counter with specific behavior.
> > Two calls to regulator_disable will trigger kernel warnings.
> > If the counter exceeds one, regulator_disable call won't disable the
> > PSE PI. These behavior isn't suitable for PSE control.
> > Added a boolean 'enabled' state to prevent multiple calls to  
> 
> Please rename rename "enabled" to "admin_state_enabled". This variable
> do not reflect real device state, it reflects only user configuration.

Right,

> 
> ...  
> > @@ -120,15 +118,9 @@ int fwnode_mdiobus_register_phy(struct mii_bus *bus,
> >  	u32 phy_id;
> >  	int rc;
> >  
> > -	psec = fwnode_find_pse_control(child);
> > -	if (IS_ERR(psec))
> > -		return PTR_ERR(psec);
> > -
> >  	mii_ts = fwnode_find_mii_timestamper(child);
> > -	if (IS_ERR(mii_ts)) {
> > -		rc = PTR_ERR(mii_ts);
> > -		goto clean_pse;
> > -	}
> > +	if (IS_ERR(mii_ts))
> > +		return PTR_ERR(mii_ts);
> >  
> >  	is_c45 = fwnode_device_is_compatible(child,
> > "ethernet-phy-ieee802.3-c45"); if (is_c45 || fwnode_get_phy_id(child,
> > &phy_id)) @@ -161,6 +153,12 @@ int fwnode_mdiobus_register_phy(struct
> > mii_bus *bus, goto clean_phy;
> >  	}
> >  
> > +	psec = dev_find_pse_control(&phy->mdio.dev);
> > +	if (IS_ERR(psec)) {
> > +		rc = PTR_ERR(psec);
> > +		goto unregister_phy;
> > +	}
> > +  
> 
> I do not think it is a good idea to make PSE controller depend on
> phy->mdio.dev. The only reason why we have fwnode_find_pse_control()
> here was the missing port abstraction.

I totally agree that having port abstraction would be more convenient.
Maxime Chevallier is currently working on this and will post it after his
multi-phy series get merged.
Meanwhile, we still need a device pointer for getting the regulator. The
phy->mdio.dev is the only one I can think of as a regulator consumer.
Another idea?

> ...
> > +static int
> > +devm_pse_pi_regulator_register(struct pse_controller_dev *pcdev,
> > +			       char *name, int id)
> > +{
> > +	struct regulator_config rconfig = {0};
> > +	struct regulator_desc *rdesc;
> > +	struct regulator_dev *rdev;
> > +
> > +	rdesc = devm_kzalloc(pcdev->dev, sizeof(*rdesc), GFP_KERNEL);
> > +	if (!rdesc)
> > +		return -ENOMEM;
> > +
> > +	/* Regulator descriptor id have to be the same as its associated
> > +	 * PSE PI id for the well functioning of the PSE controls.
> > +	 */
> > +	rdesc->id = id;
> > +	rdesc->name = name;
> > +	rdesc->type = REGULATOR_CURRENT;
> > +	rdesc->ops = &pse_pi_ops;
> > +	rdesc->owner = pcdev->owner;
> > +
> > +	rconfig.dev = pcdev->dev;
> > +	rconfig.driver_data = pcdev;
> > +	rconfig.init_data = &pse_pi_initdata;  
> 
> Please add input supply to track all dependencies:
>         if (of_property_present(np, "vin-supply"))
> config->input_supply = "vin";
> 
> May be better to make it not optional...

Does the "vin-supply" property be added at the pse-pi node level or the
pse-controller node level or at the hardware port node level or the manager node
level for the pd692x0?
Maybe better at the pse-pi node level and each PIs of the manager will get the
same regulator?
What do you think?
 
> Should be tested, but if, instead of "vin-supply", we will use
> "pse-supply" it will make most part of pse_regulator.c obsolete.

Don't know, if it is done at the pse-pi node level it may not break
pse_regulator.c. Not sure about it.

> ....  
> > @@ -310,6 +452,20 @@ pse_control_get_internal(struct pse_controller_dev
> > *pcdev, unsigned int index) return ERR_PTR(-ENODEV);
> >  	}
> >  
> > +	psec->ps = devm_regulator_get_exclusive(dev,
> > +
> > rdev_get_name(pcdev->pi[index].rdev));
> > +	if (IS_ERR(psec->ps)) {
> > +		kfree(psec);
> > +		return ERR_CAST(psec->ps);
> > +	}
> > +
> > +	ret = regulator_is_enabled(psec->ps);
> > +	if (ret < 0) {
> > +		kfree(psec);
> > +		return ERR_PTR(ret);
> > +	}
> > +	pcdev->pi[index].enabled = ret;  
> 
> If I see it correctly, it will prevent us to refcount a request from
> user space. So, the runtime PM may suspend PI.

I don't think so as the regulator_get_exclusive() does the same and refcount it:
https://elixir.bootlin.com/linux/v6.7.8/source/drivers/regulator/core.c#L2268

> > +	switch (config->c33_admin_control) {
> > +	case ETHTOOL_C33_PSE_ADMIN_STATE_ENABLED:
> > +		if (!psec->pcdev->pi[psec->id].enabled)
> > +			err = regulator_enable(psec->ps);
> > +		break;
> > +	case ETHTOOL_C33_PSE_ADMIN_STATE_DISABLED:
> > +		if (psec->pcdev->pi[psec->id].enabled)
> > +			err = regulator_disable(psec->ps);
> > +		break;
> > +	default:
> > +		err = -EOPNOTSUPP;
> >  	}  
> 
> This change seems to break PoDL support

Oh that's totally true sorry for that mistake.

Regards,
-- 
Köry Maincent, Bootlin
Embedded Linux and kernel engineering
https://bootlin.com

Re: [PATCH net-next v5 13/17] net: pse-pd: Use regulator framework within PSE framework

[Oleksij Rempel]

On Mon, Mar 04, 2024 at 10:27:08AM +0100, Köry Maincent wrote:
> Hello Oleksij,

> > > +	psec = dev_find_pse_control(&phy->mdio.dev);
> > > +	if (IS_ERR(psec)) {
> > > +		rc = PTR_ERR(psec);
> > > +		goto unregister_phy;
> > > +	}
> > > +  
> > 
> > I do not think it is a good idea to make PSE controller depend on
> > phy->mdio.dev. The only reason why we have fwnode_find_pse_control()
> > here was the missing port abstraction.
> 
> I totally agree that having port abstraction would be more convenient.
> Maxime Chevallier is currently working on this and will post it after his
> multi-phy series get merged.
> Meanwhile, we still need a device pointer for getting the regulator. The
> phy->mdio.dev is the only one I can think of as a regulator consumer.
> Another idea?

I would say, in current code state, PSE controller is regulator provider and
consumer - both are same devices. Otherwise, it will be impossible to
unregistered PHY devices without shutting down PSE-PI. Mostly, we should
be able to continue to provide the power even if network interface is down. 

> > > +	rconfig.dev = pcdev->dev;
> > > +	rconfig.driver_data = pcdev;
> > > +	rconfig.init_data = &pse_pi_initdata;  
> > 
> > Please add input supply to track all dependencies:
> >         if (of_property_present(np, "vin-supply"))
> > config->input_supply = "vin";
> > 
> > May be better to make it not optional...
> 
> Does the "vin-supply" property be added at the pse-pi node level or the
> pse-controller node level or at the hardware port node level or the manager node
> level for the pd692x0?
> Maybe better at the pse-pi node level and each PIs of the manager will get the
> same regulator?
> What do you think?

Yes, I agree. PSE-PI should share same parent regulator. Different PSE
managers may have different power supplies. One port (PSE PI) - not.

>  
> > Should be tested, but if, instead of "vin-supply", we will use
> > "pse-supply" it will make most part of pse_regulator.c obsolete.
> 
> Don't know, if it is done at the pse-pi node level it may not break
> pse_regulator.c. Not sure about it.

me too. Before your patch set, the regulator topology for PoDL PSE was
following:
power-source
  fixed-regulator
     PoDL_PSE-consumer

Now it will be:
power-source
  fixed-regulator
     PoDL_PSE-consumer
       PSE-PI-provider
         PSE-PI-consumer

By porting porting PSE framework to regulator, probably it make sense to
remove two levels of regulators?
power-source
  fixed-regulator
     PSE-PI-consumer

> > ....  
> > > @@ -310,6 +452,20 @@ pse_control_get_internal(struct pse_controller_dev
> > > *pcdev, unsigned int index) return ERR_PTR(-ENODEV);
> > >  	}
> > >  
> > > +	psec->ps = devm_regulator_get_exclusive(dev,
> > > +
> > > rdev_get_name(pcdev->pi[index].rdev));
> > > +	if (IS_ERR(psec->ps)) {
> > > +		kfree(psec);
> > > +		return ERR_CAST(psec->ps);
> > > +	}
> > > +
> > > +	ret = regulator_is_enabled(psec->ps);
> > > +	if (ret < 0) {
> > > +		kfree(psec);
> > > +		return ERR_PTR(ret);
> > > +	}
> > > +	pcdev->pi[index].enabled = ret;  
> > 
> > If I see it correctly, it will prevent us to refcount a request from
> > user space. So, the runtime PM may suspend PI.
> 
> I don't think so as the regulator_get_exclusive() does the same and refcount it:
> https://elixir.bootlin.com/linux/v6.7.8/source/drivers/regulator/core.c#L2268

ok, thx.

-- 
Pengutronix e.K.                           |                             |
Steuerwalder Str. 21                       | http://www.pengutronix.de/  |
31137 Hildesheim, Germany                  | Phone: +49-5121-206917-0    |
Amtsgericht Hildesheim, HRA 2686           | Fax:   +49-5121-206917-5555 |

Re: [PATCH net-next v5 13/17] net: pse-pd: Use regulator framework within PSE framework

[Andrew Lunn]

> > > +	psec = dev_find_pse_control(&phy->mdio.dev);
> > > +	if (IS_ERR(psec)) {
> > > +		rc = PTR_ERR(psec);
> > > +		goto unregister_phy;
> > > +	}
> > > +  
> > 
> > I do not think it is a good idea to make PSE controller depend on
> > phy->mdio.dev. The only reason why we have fwnode_find_pse_control()
> > here was the missing port abstraction.
> 
> I totally agree that having port abstraction would be more convenient.
> Maxime Chevallier is currently working on this and will post it after his
> multi-phy series get merged.
> Meanwhile, we still need a device pointer for getting the regulator. The
> phy->mdio.dev is the only one I can think of as a regulator consumer.
> Another idea?

Sorry, i've not been keeping up...

Doesn't the device tree binding determine this? Where is the consumer
in the tree?

   Andrew

Re: [PATCH net-next v5 13/17] net: pse-pd: Use regulator framework within PSE framework

[Oleksij Rempel]

On Mon, Mar 04, 2024 at 02:32:50PM +0100, Andrew Lunn wrote:
> > > > +	psec = dev_find_pse_control(&phy->mdio.dev);
> > > > +	if (IS_ERR(psec)) {
> > > > +		rc = PTR_ERR(psec);
> > > > +		goto unregister_phy;
> > > > +	}
> > > > +  
> > > 
> > > I do not think it is a good idea to make PSE controller depend on
> > > phy->mdio.dev. The only reason why we have fwnode_find_pse_control()
> > > here was the missing port abstraction.
> > 
> > I totally agree that having port abstraction would be more convenient.
> > Maxime Chevallier is currently working on this and will post it after his
> > multi-phy series get merged.
> > Meanwhile, we still need a device pointer for getting the regulator. The
> > phy->mdio.dev is the only one I can think of as a regulator consumer.
> > Another idea?
> 
> Sorry, i've not been keeping up...
> 
> Doesn't the device tree binding determine this? Where is the consumer
> in the tree?

The real consumer is outside of the system. Withing the system, it would
be the RJ45 port, but we have no abstraction for ports so far.

-- 
Pengutronix e.K.                           |                             |
Steuerwalder Str. 21                       | http://www.pengutronix.de/  |
31137 Hildesheim, Germany                  | Phone: +49-5121-206917-0    |
Amtsgericht Hildesheim, HRA 2686           | Fax:   +49-5121-206917-5555 |

Re: [PATCH net-next v5 13/17] net: pse-pd: Use regulator framework within PSE framework

[Andrew Lunn]

On Mon, Mar 04, 2024 at 02:39:08PM +0100, Oleksij Rempel wrote:
> On Mon, Mar 04, 2024 at 02:32:50PM +0100, Andrew Lunn wrote:
> > > > > +	psec = dev_find_pse_control(&phy->mdio.dev);
> > > > > +	if (IS_ERR(psec)) {
> > > > > +		rc = PTR_ERR(psec);
> > > > > +		goto unregister_phy;
> > > > > +	}
> > > > > +  
> > > > 
> > > > I do not think it is a good idea to make PSE controller depend on
> > > > phy->mdio.dev. The only reason why we have fwnode_find_pse_control()
> > > > here was the missing port abstraction.
> > > 
> > > I totally agree that having port abstraction would be more convenient.
> > > Maxime Chevallier is currently working on this and will post it after his
> > > multi-phy series get merged.
> > > Meanwhile, we still need a device pointer for getting the regulator. The
> > > phy->mdio.dev is the only one I can think of as a regulator consumer.
> > > Another idea?
> > 
> > Sorry, i've not been keeping up...
> > 
> > Doesn't the device tree binding determine this? Where is the consumer
> > in the tree?
> 
> The real consumer is outside of the system.

The device on the other end of the cable?

> Withing the system, it would be the RJ45 port, but we have no
> abstraction for ports so far.

A Linux regulator is generally used in a producer/consumer pair. If
there is no consumer device, why have a producer? What is going to use
the consumer API?

When we have a port representor, do we expect it to have active
elements? Something which will consume this regulator?

	  Andrew

Re: [PATCH net-next v5 13/17] net: pse-pd: Use regulator framework within PSE framework

[Oleksij Rempel]

On Mon, Mar 04, 2024 at 02:53:54PM +0100, Andrew Lunn wrote:
> On Mon, Mar 04, 2024 at 02:39:08PM +0100, Oleksij Rempel wrote:
> > On Mon, Mar 04, 2024 at 02:32:50PM +0100, Andrew Lunn wrote:
> > > > > > +	psec = dev_find_pse_control(&phy->mdio.dev);
> > > > > > +	if (IS_ERR(psec)) {
> > > > > > +		rc = PTR_ERR(psec);
> > > > > > +		goto unregister_phy;
> > > > > > +	}
> > > > > > +  
> > > > > 
> > > > > I do not think it is a good idea to make PSE controller depend on
> > > > > phy->mdio.dev. The only reason why we have fwnode_find_pse_control()
> > > > > here was the missing port abstraction.
> > > > 
> > > > I totally agree that having port abstraction would be more convenient.
> > > > Maxime Chevallier is currently working on this and will post it after his
> > > > multi-phy series get merged.
> > > > Meanwhile, we still need a device pointer for getting the regulator. The
> > > > phy->mdio.dev is the only one I can think of as a regulator consumer.
> > > > Another idea?
> > > 
> > > Sorry, i've not been keeping up...
> > > 
> > > Doesn't the device tree binding determine this? Where is the consumer
> > > in the tree?
> > 
> > The real consumer is outside of the system.
> 
> The device on the other end of the cable?

yes.

> > Withing the system, it would be the RJ45 port, but we have no
> > abstraction for ports so far.
> 
> A Linux regulator is generally used in a producer/consumer pair. If
> there is no consumer device, why have a producer? What is going to use
> the consumer API?

We already consulted Mark Brown in precious iterations of this patch
series and got his OK. I also described all advantages of using
regulator framework within the PSE subsystem. I need to search it. Short answer,
it is relatively common to have open-ended regulator with consumer outside of
the system. A PSE system can be relatively complex, representing all
supply dependencies from power supplies (one or multiple) to the ports
will help to provide needed diagnostic information and power saving
if port are disabled. Some functionality is currently not supported by
the regulator framework, but need to be extended - power budged,
priorities and reservation. All of this are not exclusive PSE
challenges. So, using regulator framework seems to be a straightforward 
decision.

> When we have a port representor, do we expect it to have active
> elements? Something which will consume this regulator?

Not in a usual sense. There are two levels of PSE control:
- autodetected by PSE controller
- fine tuned by using LLDP wich may respond to PD requests by allocating
  more or reducing/disabling power.

Regards,
Oleksij
-- 
Pengutronix e.K.                           |                             |
Steuerwalder Str. 21                       | http://www.pengutronix.de/  |
31137 Hildesheim, Germany                  | Phone: +49-5121-206917-0    |
Amtsgericht Hildesheim, HRA 2686           | Fax:   +49-5121-206917-5555 |

Re: [PATCH net-next v5 00/17] net: Add support for Power over Ethernet (PoE)

[Köry Maincent]

On Tue, 27 Feb 2024 10:31:05 -0500
Jamal Hadi Salim <jhs@mojatatu.com> wrote:

> On Tue, Feb 27, 2024 at 9:43 AM Kory Maincent <kory.maincent@bootlin.com>
> wrote:
> >
> > This patch series aims at adding support for PoE (Power over Ethernet),
> > based on the already existing support for PoDL (Power over Data Line)
> > implementation. In addition, it adds support for two specific PoE
> > controller, the Microchip PD692x0 and the TI TPS23881.
> >
> > This patch series is sponsored by Dent Project
> > <dentproject@linuxfoundation.org>.  
> 
> Sorry, couldnt resist because it sounded like a commercial;-> And
> likely i am out of touch. I am all for giving credit but does it have
> to be explicitly called out as "this patch is sponsored by X"?

Hello Jamal,

I will remove the line and add it in the From field as suggested by Jakub.
It seems to be the usual way to do it.

Regards,
-- 
Köry Maincent, Bootlin
Embedded Linux and kernel engineering
https://bootlin.com

Re: [PATCH net-next v5 13/17] net: pse-pd: Use regulator framework within PSE framework

[Kory Maincent]

Hello Oleksij,

On Mon, 4 Mar 2024 11:31:19 +0100
Oleksij Rempel <o.rempel@pengutronix.de> wrote:

> >    
> > > Should be tested, but if, instead of "vin-supply", we will use
> > > "pse-supply" it will make most part of pse_regulator.c obsolete.  
> > 
> > Don't know, if it is done at the pse-pi node level it may not break
> > pse_regulator.c. Not sure about it.  
> 
> me too. Before your patch set, the regulator topology for PoDL PSE was
> following:
> power-source
>   fixed-regulator
>      PoDL_PSE-consumer
> 
> Now it will be:
> power-source
>   fixed-regulator
>      PoDL_PSE-consumer
>        PSE-PI-provider
>          PSE-PI-consumer
> 
> By porting porting PSE framework to regulator, probably it make sense to
> remove two levels of regulators?
> power-source
>   fixed-regulator
>      PSE-PI-consumer

Sorry, I forgot to reply about this.
This is specific to pse_regulator driver. Could we tackle this change in another
patch series when the current patch series got applied?
Also I don't have the hardware to test it.

Regards,
-- 
Köry Maincent, Bootlin
Embedded Linux and kernel engineering
https://bootlin.com

Re: [PATCH net-next v5 13/17] net: pse-pd: Use regulator framework within PSE framework

[Oleksij Rempel]

On Thu, Mar 21, 2024 at 05:15:24PM +0100, Kory Maincent wrote:
> Hello Oleksij,
> 
> On Mon, 4 Mar 2024 11:31:19 +0100
> Oleksij Rempel <o.rempel@pengutronix.de> wrote:
> 
> > >    
> > > > Should be tested, but if, instead of "vin-supply", we will use
> > > > "pse-supply" it will make most part of pse_regulator.c obsolete.  
> > > 
> > > Don't know, if it is done at the pse-pi node level it may not break
> > > pse_regulator.c. Not sure about it.  
> > 
> > me too. Before your patch set, the regulator topology for PoDL PSE was
> > following:
> > power-source
> >   fixed-regulator
> >      PoDL_PSE-consumer
> > 
> > Now it will be:
> > power-source
> >   fixed-regulator
> >      PoDL_PSE-consumer
> >        PSE-PI-provider
> >          PSE-PI-consumer
> > 
> > By porting porting PSE framework to regulator, probably it make sense to
> > remove two levels of regulators?
> > power-source
> >   fixed-regulator
> >      PSE-PI-consumer
> 
> Sorry, I forgot to reply about this.
> This is specific to pse_regulator driver. Could we tackle this change in another
> patch series when the current patch series got applied?
> Also I don't have the hardware to test it.

ACK, no problem.

-- 
Pengutronix e.K.                           |                             |
Steuerwalder Str. 21                       | http://www.pengutronix.de/  |
31137 Hildesheim, Germany                  | Phone: +49-5121-206917-0    |
Amtsgericht Hildesheim, HRA 2686           | Fax:   +49-5121-206917-5555 |

Re: [PATCH net-next v5 13/17] net: pse-pd: Use regulator framework within PSE framework

[Kory Maincent]

Hello Oleksij,

On Thu, 21 Mar 2024 17:43:14 +0100
Oleksij Rempel <o.rempel@pengutronix.de> wrote:

> On Thu, Mar 21, 2024 at 05:15:24PM +0100, Kory Maincent wrote:
> > Hello Oleksij,
> > Sorry, I forgot to reply about this.
> > This is specific to pse_regulator driver. Could we tackle this change in
> > another patch series when the current patch series got applied?
> > Also I don't have the hardware to test it.  
> 
> ACK, no problem.

I have a question unrelated to this.
Why do you add refcount on the pse_control struct?
The pse control is related to the RJ45 port. Each port is exclusively related
to one pse control.
Shouldn't we return an error in case of two get of the same pse control index?
Do you see use cases where a pse control could be get two times?

Regards,
-- 
Köry Maincent, Bootlin
Embedded Linux and kernel engineering
https://bootlin.com

Re: [PATCH net-next v5 13/17] net: pse-pd: Use regulator framework within PSE framework

[Oleksij Rempel]

Hay Kory,

On Fri, Mar 22, 2024 at 11:39:50AM +0100, Kory Maincent wrote:
> Hello Oleksij,
> 
> On Thu, 21 Mar 2024 17:43:14 +0100
> Oleksij Rempel <o.rempel@pengutronix.de> wrote:
> 
> > On Thu, Mar 21, 2024 at 05:15:24PM +0100, Kory Maincent wrote:
> > > Hello Oleksij,
> > > Sorry, I forgot to reply about this.
> > > This is specific to pse_regulator driver. Could we tackle this change in
> > > another patch series when the current patch series got applied?
> > > Also I don't have the hardware to test it.  
> > 
> > ACK, no problem.
> 
> I have a question unrelated to this.
> Why do you add refcount on the pse_control struct?
> The pse control is related to the RJ45 port. Each port is exclusively related
> to one pse control.
> Shouldn't we return an error in case of two get of the same pse control index?
> Do you see use cases where a pse control could be get two times?

I assume, any instance which need coordinate PSE behavior with own actions. For
example - PHY will probably need to coordinate PHY state with PSE PD
classification process.

Regards,
Oleksij
-- 
Pengutronix e.K.                           |                             |
Steuerwalder Str. 21                       | http://www.pengutronix.de/  |
31137 Hildesheim, Germany                  | Phone: +49-5121-206917-0    |
Amtsgericht Hildesheim, HRA 2686           | Fax:   +49-5121-206917-5555 |

Re: [PATCH net-next v5 13/17] net: pse-pd: Use regulator framework within PSE framework

[Kory Maincent]

On Fri, 22 Mar 2024 15:07:45 +0100
Oleksij Rempel <o.rempel@pengutronix.de> wrote:

> Hay Kory,
> 
> On Fri, Mar 22, 2024 at 11:39:50AM +0100, Kory Maincent wrote:
> > Hello Oleksij,
> > 
> > On Thu, 21 Mar 2024 17:43:14 +0100
> > Oleksij Rempel <o.rempel@pengutronix.de> wrote:
> >   
> > > On Thu, Mar 21, 2024 at 05:15:24PM +0100, Kory Maincent wrote:  
> > > > Hello Oleksij,
> > > > Sorry, I forgot to reply about this.
> > > > This is specific to pse_regulator driver. Could we tackle this change in
> > > > another patch series when the current patch series got applied?
> > > > Also I don't have the hardware to test it.    
> > > 
> > > ACK, no problem.  
> > 
> > I have a question unrelated to this.
> > Why do you add refcount on the pse_control struct?
> > The pse control is related to the RJ45 port. Each port is exclusively
> > related to one pse control.
> > Shouldn't we return an error in case of two get of the same pse control
> > index? Do you see use cases where a pse control could be get two times?  
> 
> I assume, any instance which need coordinate PSE behavior with own actions.
> For example - PHY will probably need to coordinate PHY state with PSE PD
> classification process.

Indeed, I was focused on devicetree and didn't thought of coordination
between PHY and PSE. Thanks for your reply.

Regards,
-- 
Köry Maincent, Bootlin
Embedded Linux and kernel engineering
https://bootlin.com