parse_fw_cfg(9)

💖 parse_fw_cfg(9) — a Kernel API Manual moment 💖

okay so this is parse_fw_cfg(9), bestie, and it's literally the little function that reads your firmware pinconf parameters for you. no cap, it's giving "quietly doing the most" 🎀

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✨ NAME ✨

parse_fw_cfg — Parse firmware pinconf parameters 🦋

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🌸 SYNOPSIS 🌸

int parse_fw_cfg (struct fwnode_handle *fwnode , const struct
       pinconf_generic_params *params , unsigned int count , unsigned long *cfg
       , unsigned int *ncfg );

like, that's the whole signature. she's a little long, she's a little extra, but she's iconic 💅

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👑 ARGUMENTS 👑

• fwnode — the firmware node, aka the main character we're reading from 🌟
• params — an array of describing generic parameters (yes, "describing generic parameters", that's the actual vibe, don't come for me 😭)
• count — how many entries live in params
• cfg — the array of parsed config options, where the results go 💖
• ncfg — how many entries are in cfg (and it gets updated, keep reading 👀)

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🔥 DESCRIPTION 🔥

so what she does is: parse the config options described in params from fwnode, and put the result in cfg. simple, clean, slay. ✨

now here's the part you actually need to remember, bestie: cfg does not need to be empty. nope! entries are added beginning at ncfg, so it just keeps stacking on top of whatever's already there 🫶

and ncfg is updated to reflect the number of entries after parsing. so she comes back changed, she's been through something, she's grown 😌

⚠️ real talk though: cfg needs to have enough memory allocated to hold all possible entries. all of them. every single one. if you under-allocate you're gonna have a bad time, no cap 💀

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🌈 SEE ALSO 🌈

• Kernel file ./drivers/pinctrl/pinconf-generic.c
• pinconf_generic_dump_pins(9)
• pinconf_generic_parse_dt_pinmux(9)
• pinconf_generic_parse_dt_config(9)

like, go read those too, iykyk 🧚

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and that's the whole page, periodt 💜

sign-off vibes: this one lives over in ./drivers/pinctrl, and it's dated October 2026 — put it in your calendar bestie, or don't, it's a manpage date not a birthday 🍓💅