netdev - [PATCH 1/1] net: phy: dp83867: Add support for active-low LEDs

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Message-Id: <20240130090043.663865-1-alexander.stein@ew.tq-group.com>
Date: Tue, 30 Jan 2024 10:00:43 +0100
From: Alexander Stein <alexander.stein@...tq-group.com>
To: Andrew Lunn <andrew@...n.ch>,
	Heiner Kallweit <hkallweit1@...il.com>,
	Russell King <linux@...linux.org.uk>,
	"David S . Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>,
	Paolo Abeni <pabeni@...hat.com>
Cc: Alexander Stein <alexander.stein@...tq-group.com>,
	netdev@...r.kernel.org
Subject: [PATCH 1/1] net: phy: dp83867: Add support for active-low LEDs

Add the led_polarity_set callback for setting LED polarity.

Signed-off-by: Alexander Stein <alexander.stein@...tq-group.com>
---
With the addition of LED polarity modes, PHY LEDs attached to this PHY can
be configured as active-low.

Note1: This callback is only called if at least once bit of 'enum phy_led_modes'
  is set. This works only because active-high is default on this hardware.

Note2: DP83867_SW_RESET in dp83867_phy_reset clears any previously set config.
  This needs to be addressed as well. Same for interface down/up cycle which
  might include a hardware reset as well. So LED config needs to be cached.

But that's independent from this change.

[1] https://lore.kernel.org/all/20240125203702.4552-4-ansuelsmth@gmail.com/

 drivers/net/phy/dp83867.c | 22 ++++++++++++++++++++++
 1 file changed, 22 insertions(+)

diff --git a/drivers/net/phy/dp83867.c b/drivers/net/phy/dp83867.c
index 5f08f9d38bd7a..4120385c5a79d 100644
--- a/drivers/net/phy/dp83867.c
+++ b/drivers/net/phy/dp83867.c
@@ -158,6 +158,7 @@
 /* LED_DRV bits */
 #define DP83867_LED_DRV_EN(x)	BIT((x) * 4)
 #define DP83867_LED_DRV_VAL(x)	BIT((x) * 4 + 1)
+#define DP83867_LED_POLARITY(x)	BIT((x) * 4 + 2)
 
 #define DP83867_LED_FN(idx, val)	(((val) & 0xf) << ((idx) * 4))
 #define DP83867_LED_FN_MASK(idx)	(0xf << ((idx) * 4))
@@ -1152,6 +1153,26 @@ static int dp83867_led_hw_control_get(struct phy_device *phydev, u8 index,
 	return 0;
 }
 
+static int dp83867_led_polarity_set(struct phy_device *phydev, int index,
+				    unsigned long modes)
+{
+	/* Default active high */
+	u16 polarity = DP83867_LED_POLARITY(index);
+	u32 mode;
+
+	for_each_set_bit(mode, &modes, __PHY_LED_MODES_NUM) {
+		switch (mode) {
+		case PHY_LED_ACTIVE_LOW:
+			polarity = 0;
+			break;
+		default:
+			return -EINVAL;
+		}
+	}
+	return phy_modify(phydev, DP83867_LEDCR2,
+			  DP83867_LED_POLARITY(index), polarity);
+}
+
 static struct phy_driver dp83867_driver[] = {
 	{
 		.phy_id		= DP83867_PHY_ID,
@@ -1184,6 +1205,7 @@ static struct phy_driver dp83867_driver[] = {
 		.led_hw_is_supported = dp83867_led_hw_is_supported,
 		.led_hw_control_set = dp83867_led_hw_control_set,
 		.led_hw_control_get = dp83867_led_hw_control_get,
+		.led_polarity_set = dp83867_led_polarity_set,
 	},
 };
 module_phy_driver(dp83867_driver);
-- 
2.34.1