linux-kernel - [net-next PATCH v5 3/5] net: phy: add support for PHY LEDs polarity modes

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Message-Id: <20231227090231.4246-4-ansuelsmth@gmail.com>
Date: Wed, 27 Dec 2023 10:02:29 +0100
From: Christian Marangi <ansuelsmth@...il.com>
To: Pavel Machek <pavel@....cz>,
	Lee Jones <lee@...nel.org>,
	Rob Herring <robh+dt@...nel.org>,
	Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
	Conor Dooley <conor+dt@...nel.org>,
	William Zhang <william.zhang@...adcom.com>,
	Anand Gore <anand.gore@...adcom.com>,
	Kursad Oney <kursad.oney@...adcom.com>,
	Florian Fainelli <florian.fainelli@...adcom.com>,
	Rafał Miłecki <rafal@...ecki.pl>,
	Broadcom internal kernel review list <bcm-kernel-feedback-list@...adcom.com>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>,
	Paolo Abeni <pabeni@...hat.com>,
	Andrew Lunn <andrew@...n.ch>,
	Heiner Kallweit <hkallweit1@...il.com>,
	Russell King <linux@...linux.org.uk>,
	Jacek Anaszewski <jacek.anaszewski@...il.com>,
	Fernández Rojas <noltari@...il.com>,
	Sven Schwermer <sven.schwermer@...ruptive-technologies.com>,
	Christian Marangi <ansuelsmth@...il.com>,
	linux-leds@...r.kernel.org,
	devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	netdev@...r.kernel.org
Subject: [net-next PATCH v5 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 <ansuelsmth@...il.com>
---
Changes v5:
- Rework to LED modes bitmap
Changes v4:
- Drop for global active-low
- Rework to polarity option (for marvell10g series support)
Changes v3:
- Out of RFC
Changes v2:
- Add this patch

 drivers/net/phy/phy_device.c | 12 ++++++++++++
 include/linux/phy.h          | 22 ++++++++++++++++++++++
 2 files changed, 34 insertions(+)

diff --git a/drivers/net/phy/phy_device.c b/drivers/net/phy/phy_device.c
index 3611ea64875e..b99c7579d9c4 100644
--- a/drivers/net/phy/phy_device.c
+++ b/drivers/net/phy/phy_device.c
@@ -3097,6 +3097,7 @@ static int of_phy_led(struct phy_device *phydev,
 	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;
@@ -3114,6 +3115,17 @@ static int of_phy_led(struct phy_device *phydev,
 	if (index > U8_MAX)
 		return -EINVAL;
 
+	if (phydev->drv->led_polarity_set) {
+		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);
+
+		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;
diff --git a/include/linux/phy.h b/include/linux/phy.h
index e9e85d347587..5ac54f9eee82 100644
--- a/include/linux/phy.h
+++ b/include/linux/phy.h
@@ -853,6 +853,15 @@ struct phy_plca_status {
 	bool pst;
 };
 
+/* 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_led: An LED driven by the PHY
  *
@@ -1146,6 +1155,19 @@ struct phy_driver {
 	int (*led_hw_control_get)(struct phy_device *dev, u8 index,
 				  unsigned long *rules);
 
+	/**
+	 * @led_polarity_set: Set the LED polarity if active low
+	 * @dev: PHY device which has the LED
+	 * @index: Which LED of the PHY device or -1
+	 * @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)
-- 
2.40.1