fsl_rio_dbell_handler(9)

💅 fsl_rio_dbell_handler(9) — Kernel API Manual 🎀

okay so bestie, welcome to the manual page for fsl_rio_dbell_handler, aka the MPC85xx doorbell interrupt handler ✨ (yes, like a literal doorbell, but for kernels, iykyk 🦋)

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🌸 NAME 🌸

fsl_rio_dbell_handler — the MPC85xx doorbell interrupt handler, no cap 🔔

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✨ SYNOPSIS ✨

irqreturn_t fsl_rio_dbell_handler (int irq , void *dev_instance );

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🫶 ARGUMENTS 🫶

• irq — the Linux interrupt number, like the vip pass for which interrupt we're dealing with 💳
• dev_instance — pointer to interrupt-specific data, the little bag of goodies that comes with it 🎀

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👑 DESCRIPTION 👑

so what does it do? it handles doorbell interrupts, periodt. 💅

the way it works is it parses a list of registered doorbell event handlers and then executes a matching event handler — like going through the group chat until you find the one friend who actually knows what's going on 😭🔥

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🌈 SEE ALSO 🌈

the kernel file ./arch/powerpc/sysdev/fsl_rmu.c (go read it, it's giving main character energy 📖) and also these iconic siblings:

• fsl_rio_tx_handler(9)
• fsl_rio_rx_handler(9)
• fsl_rio_port_write_handler(9)
• fsl_rio_pw_enable(9)
• fsl_rio_port_write_init(9)
• fsl_rio_doorbell_send(9)
• fsl_add_outb_message(9)
• fsl_open_outb_mbox(9)
• fsl_close_outb_mbox(9)
• fsl_open_inb_mbox(9)
• fsl_close_inb_mbox(9)
• fsl_add_inb_buffer(9)
• fsl_get_inb_message(9)
• fsl_rio_doorbell_init(9)

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🦋 mwah, that's the whole page! this one's living in ./arch/powerpc/sysdev, stamped October 2026 — tysm for reading bestie, slay your interrupts responsibly 💖⭐🍓