linux-kernel - [net-next PATCH v4 2/3] net: phy: add simple helper to return count of supported speeds

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Date: Sat, 16 Dec 2023 17:12:05 +0100
From: Christian Marangi <ansuelsmth@...il.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>,
	netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org
Cc: Christian Marangi <ansuelsmth@...il.com>
Subject: [net-next PATCH v4 2/3] net: phy: add simple helper to return count of supported speeds

Add simple helper to return count of supported speeds for the passed PHY
device.

This can be useful to know the number of speed modes to dynamically
allocate a speed array for it.

Signed-off-by: Christian Marangi <ansuelsmth@...il.com>
---
 drivers/net/phy/phy.c | 12 ++++++++++++
 include/linux/phy.h   |  2 ++
 2 files changed, 14 insertions(+)

diff --git a/drivers/net/phy/phy.c b/drivers/net/phy/phy.c
index a5fa077650e8..3e579dd8a5e7 100644
--- a/drivers/net/phy/phy.c
+++ b/drivers/net/phy/phy.c
@@ -229,6 +229,18 @@ phy_find_valid(int speed, int duplex, unsigned long *supported)
 	return phy_lookup_setting(speed, duplex, supported, false);
 }
 
+/**
+ * phy_supported_speeds_num - return the number of all speeds currently
+ *			      supported by a phy device
+ * @phy: The phy device to return supported speeds of.
+ *
+ * Returns: the number of supported speeds.
+ */
+unsigned int phy_supported_speeds_num(struct phy_device *phy)
+{
+	return phy_speeds(NULL, 0, phy->supported);
+}
+
 /**
  * phy_supported_speeds - return all speeds currently supported by a phy device
  * @phy: The phy device to return supported speeds of.
diff --git a/include/linux/phy.h b/include/linux/phy.h
index 3cc52826f18e..52aa415fab0f 100644
--- a/include/linux/phy.h
+++ b/include/linux/phy.h
@@ -202,6 +202,8 @@ static inline void phy_interface_set_rgmii(unsigned long *intf)
 	__set_bit(PHY_INTERFACE_MODE_RGMII_TXID, intf);
 }
 
+unsigned int phy_supported_speeds_num(struct phy_device *phy);
+
 /*
  * phy_supported_speeds - return all speeds currently supported by a PHY device
  */
-- 
2.40.1