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net: pse-pd: Add support for PSE power domains

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Introduce PSE power domain support as groundwork for upcoming port
priority features. Multiple PSE PIs can now be grouped under a single
PSE power domain, enabling future enhancements like defining available
power budgets, port priority modes, and disconnection policies. This
setup will allow the system to assess whether activating a port would
exceed the available power budget, preventing over-budget states
proactively.

Signed-off-by: Kory Maincent (Dent Project) <kory.maincent@bootlin.com>
Reviewed-by: Oleksij Rempel <o.rempel@pengutronix.de>
Link: https://patch.msgid.link/20250617-feature_poe_port_prio-v14-4-78a1a645e2ee@bootlin.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Kory Maincent (Dent Project)
2025-06-17 14:12:03 +02:00
committed by Jakub Kicinski
parent f5e7aecaa4
commit 50f8b341d2
2 changed files with 142 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files

140
drivers/net/pse-pd/pse_core.c
View File

@@ -16,8 +16,12 @@
#include <linux/rtnetlink.h>
#include <net/net_trackers.h>
#define PSE_PW_D_LIMIT INT_MAX
static DEFINE_MUTEX(pse_list_mutex);
static LIST_HEAD(pse_controller_list);
static DEFINE_XARRAY_ALLOC(pse_pw_d_map);
static DEFINE_MUTEX(pse_pw_d_mutex);
/**
* struct pse_control - a PSE control
@@ -38,6 +42,18 @@ struct pse_control {
struct phy_device *attached_phydev;
};
/**
* struct pse_power_domain - a PSE power domain
* @id: ID of the power domain
* @supply: Power supply the Power Domain
* @refcnt: Number of gets of this pse_power_domain
*/
struct pse_power_domain {
int id;
struct regulator *supply;
struct kref refcnt;
};
static int of_load_single_pse_pi_pairset(struct device_node *node,
struct pse_pi *pi,
int pairset_num)
@@ -485,6 +501,125 @@ devm_pse_pi_regulator_register(struct pse_controller_dev *pcdev,
return 0;
}
static void __pse_pw_d_release(struct kref *kref)
{
struct pse_power_domain *pw_d = container_of(kref,
struct pse_power_domain,
refcnt);
regulator_put(pw_d->supply);
xa_erase(&pse_pw_d_map, pw_d->id);
mutex_unlock(&pse_pw_d_mutex);
}
/**
* pse_flush_pw_ds - flush all PSE power domains of a PSE
* @pcdev: a pointer to the initialized PSE controller device
*/
static void pse_flush_pw_ds(struct pse_controller_dev *pcdev)
{
struct pse_power_domain *pw_d;
int i;
for (i = 0; i < pcdev->nr_lines; i++) {
if (!pcdev->pi[i].pw_d)
continue;
pw_d = xa_load(&pse_pw_d_map, pcdev->pi[i].pw_d->id);
if (!pw_d)
continue;
kref_put_mutex(&pw_d->refcnt, __pse_pw_d_release,
&pse_pw_d_mutex);
}
}
/**
* devm_pse_alloc_pw_d - allocate a new PSE power domain for a device
* @dev: device that is registering this PSE power domain
*
* Return: Pointer to the newly allocated PSE power domain or error pointers
*/
static struct pse_power_domain *devm_pse_alloc_pw_d(struct device *dev)
{
struct pse_power_domain *pw_d;
int index, ret;
pw_d = devm_kzalloc(dev, sizeof(*pw_d), GFP_KERNEL);
if (!pw_d)
return ERR_PTR(-ENOMEM);
ret = xa_alloc(&pse_pw_d_map, &index, pw_d, XA_LIMIT(1, PSE_PW_D_LIMIT),
GFP_KERNEL);
if (ret)
return ERR_PTR(ret);
kref_init(&pw_d->refcnt);
pw_d->id = index;
return pw_d;
}
/**
* pse_register_pw_ds - register the PSE power domains for a PSE
* @pcdev: a pointer to the PSE controller device
*
* Return: 0 on success and failure value on error
*/
static int pse_register_pw_ds(struct pse_controller_dev *pcdev)
{
int i, ret = 0;
mutex_lock(&pse_pw_d_mutex);
for (i = 0; i < pcdev->nr_lines; i++) {
struct regulator_dev *rdev = pcdev->pi[i].rdev;
struct pse_power_domain *pw_d;
struct regulator *supply;
bool present = false;
unsigned long index;
/* No regulator or regulator parent supply registered.
* We need a regulator parent to register a PSE power domain
*/
if (!rdev || !rdev->supply)
continue;
xa_for_each(&pse_pw_d_map, index, pw_d) {
/* Power supply already registered as a PSE power
* domain.
*/
if (regulator_is_equal(pw_d->supply, rdev->supply)) {
present = true;
pcdev->pi[i].pw_d = pw_d;
break;
}
}
if (present) {
kref_get(&pw_d->refcnt);
continue;
}
pw_d = devm_pse_alloc_pw_d(pcdev->dev);
if (IS_ERR(pw_d)) {
ret = PTR_ERR(pw_d);
goto out;
}
supply = regulator_get(&rdev->dev, rdev->supply_name);
if (IS_ERR(supply)) {
xa_erase(&pse_pw_d_map, pw_d->id);
ret = PTR_ERR(supply);
goto out;
}
pw_d->supply = supply;
pcdev->pi[i].pw_d = pw_d;
}
out:
mutex_unlock(&pse_pw_d_mutex);
return ret;
}
/**
* pse_controller_register - register a PSE controller device
* @pcdev: a pointer to the initialized PSE controller device
@@ -544,6 +679,10 @@ int pse_controller_register(struct pse_controller_dev *pcdev)
return ret;
}
ret = pse_register_pw_ds(pcdev);
if (ret)
return ret;
mutex_lock(&pse_list_mutex);
list_add(&pcdev->list, &pse_controller_list);
mutex_unlock(&pse_list_mutex);
@@ -558,6 +697,7 @@ EXPORT_SYMBOL_GPL(pse_controller_register);
*/
void pse_controller_unregister(struct pse_controller_dev *pcdev)
{
pse_flush_pw_ds(pcdev);
pse_release_pis(pcdev);
mutex_lock(&pse_list_mutex);
list_del(&pcdev->list);

2
include/linux/pse-pd/pse.h
View File

@@ -222,12 +222,14 @@ struct pse_pi_pairset {
* @np: device node pointer of the PSE PI node
* @rdev: regulator represented by the PSE PI
* @admin_state_enabled: PI enabled state
* @pw_d: Power domain of the PSE PI
*/
struct pse_pi {
struct pse_pi_pairset pairset[2];
struct device_node *np;
struct regulator_dev *rdev;
bool admin_state_enabled;
struct pse_power_domain *pw_d;
};
/**