stm32_spi_prepare_mbr(9)

💅 stm32_spi_prepare_mbr(9) 💅

okay so bestie, this page comes straight out of the Kernel API Manual, and it’s about one very specific little helper: stm32_spi_prepare_mbr. It’s serving baud rate divisor realness, and we’re gonna read it together. No cap. 🫶

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🌸 NAME 🌸

stm32_spi_prepare_mbr — Determine baud rate divisor value. That’s the whole name section, and it ate. ✨

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✨ SYNOPSIS ✨

int stm32_spi_prepare_mbr (struct stm32_spi *spi , u32 speed_hz , u32 min_div , u32 max_div );

The whole function signature, untouched, because we do not mess with the source. 💅

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🎀 ARGUMENTS 🎀

• spi — pointer to the spi controller data structure. Main character pointer energy. 🫶
• speed_hz — requested speed. She’s the requested speed, periodt. 🔥
• min_div — minimum baud rate divisor. Lower bound, bestie. 🌸
• max_div — maximum baud rate divisor. Upper bound, no cap. 🌈

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🦋 DESCRIPTION 🦋

This one is short and iconic: it returns the baud rate divisor value in case of success, or -EINVAL. That’s literally the whole description. The return type is int — you can see it up in the SYNOPSIS, bestie. 💖

no extra lore added here — just success → baud rate divisor value, or -EINVAL. Periodt. 💅

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💖 SEE ALSO 💖

okay bestie, the SEE ALSO section is massive and we are not skipping a single one. Buckle up, because every reference below is exactly as listed. 🎀

• Kernel file — ./drivers/spi/spi-stm32.c
• struct stm32_spi_reg(9)
• struct stm32_spi_regspec(9)
• struct stm32_spi_cfg(9)
• struct stm32_spi(9)
• stm32h7_spi_get_fifo_size(9)
• stm32f4_spi_get_bpw_mask(9)
• stm32f7_spi_get_bpw_mask(9)
• stm32h7_spi_get_bpw_mask(9)
• stm32mp25_spi_get_bpw_mask(9)
• stm32h7_spi_prepare_fthlv(9)
• stm32f4_spi_write_tx(9)
• stm32f7_spi_write_tx(9)
• stm32h7_spi_write_txfifo(9)
• stm32f4_spi_read_rx(9)
• stm32f7_spi_read_rx(9)
• stm32h7_spi_read_rxfifo(9)
• stm32_spi_enable(9)
• stm32fx_spi_disable(9)
• stm32h7_spi_disable(9)
• stm32_spi_can_dma(9)
• stm32fx_spi_irq_event(9)
• stm32fx_spi_irq_thread(9)
• stm32h7_spi_irq_thread(9)
• stm32_spi_prepare_msg(9)
• stm32fx_spi_dma_tx_cb(9)
• stm32_spi_dma_rx_cb(9)
• stm32_spi_dma_config(9)
• 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)
• stm32f4_spi_set_bpw(9)
• stm32f7_spi_set_bpw(9)
• stm32h7_spi_set_bpw(9)
• stm32_spi_set_mbr(9)
• 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)
• stm32_spi_transfer_one_setup(9)
• stm32_spi_can_poll(9)
• stm32_spi_transfer_one(9)
• stm32_spi_unprepare_msg(9)
• stm32fx_spi_config(9)
• stm32h7_spi_config(9)

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mwah 💋 — signed from source/version ./drivers/spi, dated October 2026, on page stm32_spi_prepare_mbr(9). That’s the whole vibe. Go off, bestie. 🎀✨