dap8211r_modify_ext(9)

💅 dap8211r_modify_ext(9) — ok bestie, this is a kernel API manual page ✨

Hiii so you found dap8211r_modify_ext in the Kernel API Manual — iconic of you, honestly. Sit down, grab a strawberry drink 🍓, and let's get into it.

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🌸 NAME 🌸

dap8211r_modify_ext — it modifies bits in an extended register. That's it, that's the whole vibe. Bit-fiddling, but make it PHY-core 💅

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✨ SYNOPSIS ✨

int dap8211r_modify_ext (struct phy_device *phydev , u16 reg , u16 mask
, u16 set );

Yeah, it returns an int, and yes, all four args are right there, comma-and-all. Copy it exactly, bestie, no freestyling 🙈

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🎀 ARGUMENTS 🎀

• phydev — the PHY device structure. Your whole device situation, in struct form.
• reg — the extended register address. Which extended register we're messing with.
• mask — bit mask of bits to clear. The "no thank you" bits 🚫
• set — bit mask of bits to set. The "yes queen" bits 👑

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🦋 DESCRIPTION 🦋

So what it does: it modifies a PHY extended register using the indirect access method. Not direct. Indirect. Iykyk ✨

The glow-up formula is literally this, no cap:

New value = (old value & ~mask) | set

Read it out loud with me: take the old value, AND it with the complement of mask (that clears your masked bits), then OR in set (that sets your set bits). Boom. Bits modified. Slay 🔥

⚠️ Real talk, and I mean it: the caller must hold the MDIO bus lock. That's not a suggestion, bestie, that's a requirement. You do not want to be out here touching this without the lock. Do not test me on this one 😭

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💖 RETURN 💖

• 0 on success — we love a clean zero 🫶
• or a negative error code — aka something went wrong, check it, don't ignore it 💀

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🌈 SEE ALSO 🌈

• Kernel file ./drivers/net/phy/dap8211r.c — the source, go read it, it's giving main character energy 👑
• dap8211r_read_ext(9) — the reading counterpart
• dap8211r_config_init(9) — the config init one

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⭐ okay that's the whole page, tysm for coming to my TED talk ⭐

Sign-off corner: this little beauty lives under ./drivers/net/phy, dated October 2026, and it's filed as dap8211r_modify_ext(9). Byeee, go hold that MDIO bus lock 💜🧚