From 7ae215ee7bb855f13c80565470fc7f67db4ba82f Mon Sep 17 00:00:00 2001 From: Christian Marangi Date: Thu, 25 Jan 2024 21:36:59 +0100 Subject: [PATCH 3/5] net: phy: add support for PHY LEDs polarity modes Add support for PHY LEDs polarity modes. Some PHY require LED to be set to active low to be turned ON. Adds support for this by declaring active-low property in DT. PHY driver needs to declare .led_polarity_set() to configure LED polarity modes. Function will pass the index with the LED index and a bitmap with all the required modes to set. Current supported modes are: - active-low with the flag PHY_LED_ACTIVE_LOW. LED is set to active-low to turn it ON. - inactive-high-impedance with the flag PHY_LED_INACTIVE_HIGH_IMPEDANCE. LED is set to high impedance to turn it OFF. Signed-off-by: Christian Marangi Reviewed-by: Andrew Lunn Link: https://lore.kernel.org/r/20240125203702.4552-4-ansuelsmth@gmail.com Signed-off-by: Jakub Kicinski --- drivers/net/phy/phy_device.c | 16 ++++++++++++++++ include/linux/phy.h | 22 ++++++++++++++++++++++ 2 files changed, 38 insertions(+) --- a/drivers/net/phy/phy_device.c +++ b/drivers/net/phy/phy_device.c @@ -3138,6 +3138,7 @@ static int of_phy_led(struct phy_device struct device *dev = &phydev->mdio.dev; struct led_init_data init_data = {}; struct led_classdev *cdev; + unsigned long modes = 0; struct phy_led *phyled; u32 index; int err; @@ -3155,6 +3156,21 @@ static int of_phy_led(struct phy_device if (index > U8_MAX) return -EINVAL; + if (of_property_read_bool(led, "active-low")) + set_bit(PHY_LED_ACTIVE_LOW, &modes); + if (of_property_read_bool(led, "inactive-high-impedance")) + set_bit(PHY_LED_INACTIVE_HIGH_IMPEDANCE, &modes); + + if (modes) { + /* Return error if asked to set polarity modes but not supported */ + if (!phydev->drv->led_polarity_set) + return -EINVAL; + + err = phydev->drv->led_polarity_set(phydev, index, modes); + if (err) + return err; + } + phyled->index = index; if (phydev->drv->led_brightness_set) cdev->brightness_set_blocking = phy_led_set_brightness; --- a/include/linux/phy.h +++ b/include/linux/phy.h @@ -791,6 +791,15 @@ struct phy_led { #define to_phy_led(d) container_of(d, struct phy_led, led_cdev) +/* Modes for PHY LED configuration */ +enum phy_led_modes { + PHY_LED_ACTIVE_LOW = 0, + PHY_LED_INACTIVE_HIGH_IMPEDANCE = 1, + + /* keep it last */ + __PHY_LED_MODES_NUM, +}; + /** * struct phy_driver - Driver structure for a particular PHY type * @@ -1059,6 +1068,19 @@ struct phy_driver { int (*led_hw_control_get)(struct phy_device *dev, u8 index, unsigned long *rules); + /** + * @led_polarity_set: Set the LED polarity modes + * @dev: PHY device which has the LED + * @index: Which LED of the PHY device + * @modes: bitmap of LED polarity modes + * + * Configure LED with all the required polarity modes in @modes + * to make it correctly turn ON or OFF. + * + * Returns 0, or an error code. + */ + int (*led_polarity_set)(struct phy_device *dev, int index, + unsigned long modes); }; #define to_phy_driver(d) container_of(to_mdio_common_driver(d), \ struct phy_driver, mdiodrv)