stm32h7_spi_get_bpw_mask(9)

💅 NAME 💅

stm32h7_spi_get_bpw_mask — bestie, it just returns the bits-per-word mask ✨

So this is one of those pages from the Kernel API Manual (yes, the actual kernel, we're fancy now 🎀) and it's honestly kind of a little legend: you hand it a controller, it hands you back a mask. That's the whole vibe. No cap.

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🌸 SYNOPSIS 🌸

int stm32h7_spi_get_bpw_mask (struct stm32_spi *spi );

That's it. One argument, one int coming back at you. Short king behavior 👑

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🦋 ARGUMENTS 🦋

• spi — pointer to the spi controller data structure 🫶 literally just a pointer to the spi controller's data struct, that's the whole assignment, she's not asking for much

lowkey the most chill function signature ever — no flags, no callbacks, no environment variables, nothing to fumble 😭

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⭐ SEE ALSO ⭐

okay so this page has friends, and we are not skipping a single one of them, because every link here matters, iykyk 💖

First up, the actual home turf — the kernel file itself:

• ./drivers/spi/spi-stm32.c

And then the whole squad of structs:

• struct stm32_spi_reg(9)
• struct stm32_spi_regspec(9)
• struct stm32_spi_cfg(9)
• struct stm32_spi(9)

Then the bits-per-word mask siblings (they're a whole family, iconic):

• stm32h7_spi_get_fifo_size(9)
• stm32f4_spi_get_bpw_mask(9)
• stm32f7_spi_get_bpw_mask(9)
• stm32mp25_spi_get_bpw_mask(9)

Setup / prep girlies:

• stm32_spi_prepare_mbr(9)
• stm32h7_spi_prepare_fthlv(9)

Write path (tx gang, no skips):

• stm32f4_spi_write_tx(9)
• stm32f7_spi_write_tx(9)
• stm32h7_spi_write_txfifo(9)

Read path (rx girlies, equally valid):

• stm32f4_spi_read_rx(9)
• stm32f7_spi_read_rx(9)
• stm32h7_spi_read_rxfifo(9)

Enable/disable era:

• stm32_spi_enable(9)
• stm32fx_spi_disable(9)
• stm32h7_spi_disable(9)
• stm32_spi_can_dma(9)

IRQ thread besties:

• stm32fx_spi_irq_event(9)
• stm32fx_spi_irq_thread(9)
• stm32h7_spi_irq_thread(9)
• stm32_spi_prepare_msg(9)

DMA callback crew 🌈:

• stm32fx_spi_dma_tx_cb(9)
• stm32_spi_dma_rx_cb(9)
• stm32_spi_dma_config(9)

Transfer-one variants (there are SO many, and we love that for them):

• stm32fx_spi_transfer_one_irq(9)
• stm32h7_spi_transfer_one_poll(9)
• stm32h7_spi_transfer_one_irq(9)
• stm32fx_spi_transfer_one_dma_start(9)
• stm32f7_spi_transfer_one_dma_start(9)
• stm32h7_spi_transfer_one_dma_start(9)
• stm32_spi_prepare_rx_dma_mdma_chaining(9)
• stm32_spi_transfer_one_dma(9)

Bits-per-word setters, the ones this page is spiritually adjacent to:

• stm32f4_spi_set_bpw(9)
• stm32f7_spi_set_bpw(9)
• stm32h7_spi_set_bpw(9)
• stm32_spi_set_mbr(9)

Type / mode / framing energy 🔥:

• stm32_spi_communication_type(9)
• stm32fx_spi_set_mode(9)
• stm32h7_spi_set_mode(9)
• stm32h7_spi_data_idleness(9)
• stm32h7_spi_number_of_data(9)

Transfer plumbing:

• stm32_spi_transfer_one_setup(9)
• stm32_spi_can_poll(9)
• stm32_spi_transfer_one(9)
• stm32_spi_unprepare_msg(9)

And the config girlies, closing us out 🧚:

• stm32fx_spi_config(9)
• stm32h7_spi_config(9)

fr fr, if you're diving into spi-stm32.c, this list is your whole reading curriculum. Take notes bestie 📝💜

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🎀 one last little sign-off 🎀

This page lives in the source tree at ./drivers/spi and it's dated October 2026 — so yeah, born in the manual, raised in the kernel, and now she's here explaining bits-per-word masks to you like the main character she is 👑✨

Go get that mask, bestie. Slay 💅💖