phy_get_manual_tx_polarity(9)

💅 phy_get_manual_tx_polarity(9) 💅

okay so bestie, we're in the Kernel API Manual — yes, that Kernel API Manual — and today's main character is phy_get_manual_tx_polarity. it's giving very niche, very specific, very "you either need it or you don't" energy, and honestly? we respect it. 🎀

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✨ NAME ✨

phy_get_manual_tx_polarity — get the manual TX polarity for a PHY differential lane 🦋

like, it literally fetches the TX polarity you set by hand. no cap, that's the whole job.

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🌸 SYNOPSIS 🌸

int phy_get_manual_tx_polarity (struct fwnode_handle *fwnode , const
char *mode_name , unsigned int *val );

three args, one int coming back at you. simple. iconic. 🔥

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👑 ARGUMENTS 👑

• fwnode — pointer to the PHY's firmware node. this is the plug, the source of truth, the firmware-side bestie 🫶
• mode_name — the name of the PHY mode to look up. yes, you gotta name the mode. it's not gonna guess, bestie 😭
• val — pointer to the returned polarity. it writes the answer back through this pointer, so don't hand it a garbage address fr fr 💀

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💖 DESCRIPTION 💖

so here's the vibe: this is a helper for PHYs that come with no custom default value for the TX polarity. none. zero. nada. 🙈

like, if your PHY had a default, you wouldn't be here. but it doesn't, so you call this, pass your fwnode, your mode_name, your val pointer, and it goes and looks the manual polarity up for you. that's the whole slay. ✨

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⭐ RETURN ⭐

• zero on success — we love a clean return 🎀
• negative error on failure — it's giving "something went wrong, check your fwnode" 😭

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🌈 SEE ALSO 🌈

• Kernel file ./drivers/phy/phy-common-props.c — that's where the magic lives, go read it iykyk 👀
• fwnode_get_u32_prop_for_name(9)
• phy_get_rx_polarity(9)
• phy_get_tx_polarity(9)
• phy_get_manual_rx_polarity(9)

the whole polarity friend group honestly — rx, tx, manual rx, manual tx, they're all here and they're all eating 💅

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lowkey reminder: this is for the manual lane, and it's for PHYs without a custom default. if that's not you, go check the other polarity functions first, bestie 🧚

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kisses and goodbye from ./drivers/phy — this page is dated October 2026 under the Kernel API Manual, and yes, that's the whole footer, mwah 💜🍓