From 762837764b4e6fc001509c79a6548943996c6577 Mon Sep 17 00:00:00 2001 From: Andrew Lunn Date: Fri, 17 Mar 2023 03:31:15 +0100 Subject: [PATCH] net: phy: Add a binding for PHY LEDs Define common binding parsing for all PHY drivers with LEDs using phylib. Parse the DT as part of the phy_probe and add LEDs to the linux LED class infrastructure. For the moment, provide a dummy brightness function, which will later be replaced with a call into the PHY driver. Signed-off-by: Andrew Lunn Signed-off-by: Christian Marangi --- drivers/net/phy/Kconfig | 1 + drivers/net/phy/phy_device.c | 75 ++++++++++++++++++++++++++++++++++++ include/linux/phy.h | 16 ++++++++ 3 files changed, 92 insertions(+) diff --git a/drivers/net/phy/Kconfig b/drivers/net/phy/Kconfig index 54874555c92125..9152ef78c294b5 100644 --- a/drivers/net/phy/Kconfig +++ b/drivers/net/phy/Kconfig @@ -16,6 +16,7 @@ config PHYLINK menuconfig PHYLIB tristate "PHY Device support and infrastructure" depends on NETDEVICES + depends on LEDS_CLASS select MDIO_DEVICE select MDIO_DEVRES help diff --git a/drivers/net/phy/phy_device.c b/drivers/net/phy/phy_device.c index 3f8a64fb9d7128..251c0a62cdc380 100644 --- a/drivers/net/phy/phy_device.c +++ b/drivers/net/phy/phy_device.c @@ -19,10 +19,12 @@ #include #include #include +#include #include #include #include #include +#include #include #include #include @@ -674,6 +676,7 @@ struct phy_device *phy_device_create(struct mii_bus *bus, int addr, u32 phy_id, device_initialize(&mdiodev->dev); dev->state = PHY_DOWN; + INIT_LIST_HEAD(&dev->leds); mutex_init(&dev->lock); INIT_DELAYED_WORK(&dev->state_queue, phy_state_machine); @@ -2988,6 +2991,73 @@ static bool phy_drv_supports_irq(struct phy_driver *phydrv) return phydrv->config_intr && phydrv->handle_interrupt; } +/* Dummy implementation until calls into PHY driver are added */ +static int phy_led_set_brightness(struct led_classdev *led_cdev, + enum led_brightness value) +{ + return 0; +} + +static int of_phy_led(struct phy_device *phydev, + struct device_node *led) +{ + struct device *dev = &phydev->mdio.dev; + struct led_init_data init_data = {}; + struct led_classdev *cdev; + struct phy_led *phyled; + int err; + + phyled = devm_kzalloc(dev, sizeof(*phyled), GFP_KERNEL); + if (!phyled) + return -ENOMEM; + + cdev = &phyled->led_cdev; + + err = of_property_read_u32(led, "reg", &phyled->index); + if (err) + return err; + + cdev->brightness_set_blocking = phy_led_set_brightness; + cdev->max_brightness = 1; + init_data.devicename = dev_name(&phydev->mdio.dev); + init_data.fwnode = of_fwnode_handle(led); + + err = devm_led_classdev_register_ext(dev, cdev, &init_data); + if (err) + return err; + + list_add(&phyled->list, &phydev->leds); + + return 0; +} + +static int of_phy_leds(struct phy_device *phydev) +{ + struct device_node *node = phydev->mdio.dev.of_node; + struct device_node *leds, *led; + int err; + + if (!IS_ENABLED(CONFIG_OF_MDIO)) + return 0; + + if (!node) + return 0; + + leds = of_get_child_by_name(node, "leds"); + if (!leds) + return 0; + + for_each_available_child_of_node(leds, led) { + err = of_phy_led(phydev, led); + if (err) { + of_node_put(led); + return err; + } + } + + return 0; +} + /** * fwnode_mdio_find_device - Given a fwnode, find the mdio_device * @fwnode: pointer to the mdio_device's fwnode @@ -3187,6 +3257,11 @@ static int phy_probe(struct device *dev) /* Set the state to READY by default */ phydev->state = PHY_READY; + /* Get the LEDs from the device tree, and instantiate standard + * LEDs for them. + */ + err = of_phy_leds(phydev); + out: /* Assert the reset signal */ if (err) diff --git a/include/linux/phy.h b/include/linux/phy.h index 36bf0bbc8efa0c..64c6d8c537f7ac 100644 --- a/include/linux/phy.h +++ b/include/linux/phy.h @@ -14,6 +14,7 @@ #include #include #include +#include #include #include #include @@ -600,6 +601,7 @@ struct macsec_ops; * @phy_num_led_triggers: Number of triggers in @phy_led_triggers * @led_link_trigger: LED trigger for link up/down * @last_triggered: last LED trigger for link speed + * @leds: list of PHY LED structures * @master_slave_set: User requested master/slave configuration * @master_slave_get: Current master/slave advertisement * @master_slave_state: Current master/slave configuration @@ -699,6 +701,7 @@ struct phy_device { struct phy_led_trigger *led_link_trigger; #endif + struct list_head leds; /* * Interrupt number for this PHY @@ -834,6 +837,19 @@ struct phy_plca_status { bool pst; }; +/** + * struct phy_led: An LED driven by the PHY + * + * @list: List of LEDs + * @led_cdev: Standard LED class structure + * @index: Number of the LED + */ +struct phy_led { + struct list_head list; + struct led_classdev led_cdev; + u32 index; +}; + /** * struct phy_driver - Driver structure for a particular PHY type *