lan78xx_conf...leds_from_dt(9)

💅 lan78xx_configure_leds_from_dt — bestie's guide

okay so this is a page from the Kernel API Manual, section 9, and it's all about lan78xx_configure_leds_from_dt. yes the name is a whole mouthful, i know 😭 but it's literally just "turn on the right LEDs because the device tree said so." stick with me 🫶

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✨ NAME ✨

lan78xx_configure_leds_from_dt — configure LED enables based on DT

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🎀 SYNOPSIS 🎀

int lan78xx_configure_leds_from_dt (struct lan78xx_net *dev , struct
       phy_device *phydev );

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🌸 ARGUMENTS 🌸

• dev — the LAN78xx device 💖
• phydev — the PHY device, and heads up: it must be valid (no cap, no exceptions, she checks nothing, she just trusts you 🙈)

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🦋 DESCRIPTION 🦋

So what she does is: she reads the "microchip,led-modes" property from the PHY's DT node, and then she enables the corresponding number of LEDs by writing to HW_CFG. that's the whole vibe, honestly ✨

This helper preserves the original logic, and it enables up to 4 LEDs, periodt. 🔥

And if the property isn't there at all? she does nothing. no drama, no fallback, just vibes and an early exit 💅

lowkey important: "property not present" = function does nothing. no secret default behaviour, bestie, don't go inventing one 🌈

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⭐ RETURN ⭐

• 0 on success 🎉
• a negative error code if it goes sideways 😭

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👑 SEE ALSO 👑

Kernel file ./drivers/net/usb/lan78xx.c — go read the source, it's giving main character energy:

• lan78xx_phy_int_ack(9)
• lan78xx_configure_usb(9)
• lan78xx_configure_flowcontrol(9)
• lan78xx_mac_eee_enable(9)
• lan78xx_set_fixed_link(9)
• lan78xx_get_phy(9)
• lan78xx_mac_prepare_for_phy(9)

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k that's the page!! 💜 this one's brought to you by the fine folks over in ./drivers/net/usb, stamped October 2026, and yeah — that's the source and the date, so you can cite me. mwah 🍓🧚💖