phy_get_rx_polarity(9)

💅 phy_get_rx_polarity — get the RX polarity for a PHY differential lane

Okay bestie, so this is a page from the Kernel API Manual and honestly? It's a little function that does exactly one thing and does it cute. It's phy_get_rx_polarity, and it goes and fetches the RX polarity setting for a PHY differential lane. Yes, polarity. Yes, differential lanes. We love a niche queen. 🌸

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✨ SYNOPSIS ✨

int phy_get_rx_polarity (struct fwnode_handle *fwnode , const char
*mode_name , unsigned int supported , unsigned int default_val ,
unsigned int *val );

Like, that's the whole vibe: you hand it a firmware node, a mode name, a bitmask of what's allowed, a fallback, and somewhere to put the answer. She returns an int, because of course she does. 🎀

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🫶 ARGUMENTS 🫶

• fwnode — pointer to the PHY's firmware node. This is the starting point, the main character, the place she goes looking. 💖
• mode_name — the name of the PHY mode to look up. String in, knowledge out, iykyk.
• supported — a bit mask of PHY_POL_NORMAL, PHY_POL_INVERT and PHY_POL_AUTO. That's the menu of polarity values she's allowed to give you back. 🦋
• default_val — the default polarity value you get if the property is missing. Bestie fallback. She's got your back. ✨
• val — pointer to the returned polarity. This is where the answer lands. Write her address down, she's got mail. 💌

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🔥 RETURN 🔥

• zero on success — slay, we ate, the polarity has arrived 👑
• negative error on failure — no cap, something went wrong, she's telling you with a negative number 💀

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🌈 SEE ALSO 🌈

• Kernel file ./drivers/phy/phy-common-props.c — go read the source, it's giving lore 💜
• fwnode_get_u32_prop_for_name(9)
• phy_get_tx_polarity(9)
• phy_get_manual_rx_polarity(9)
• phy_get_manual_tx_polarity(9)

So many siblings! It's a whole family of polarity getters and, honestly, they're all iconic. 🧚

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ngl the RX half of the lane is living its truth here — polarity is serious business, so always check that return value, okay? 😭

That's the whole page, bestie. No notes, 10/10, would read again. 🍓

And finally, the little sign-off: this one lives under ./drivers/phy, dated October 2026, and that's the version of the Kernel API Manual we're all swooning over. Mwah. 💅⭐