STRUCT BCM2835_SPIDEV(9)

🌸 NAME 🌸

okay bestie, welcome to the struct bcm2835_spidev(9) page from the Kernel API Manual 💅 this one is all about struct bcm2835_spidev — the BCM2835 SPI target ✨

✨ SYNOPSIS ✨

here's the struct in all its iconic glory, no cap:

struct bcm2835_spidev {
    u32 prepare_cs;
    struct dma_async_tx_descriptor *clear_rx_desc;
    dma_addr_t clear_rx_addr;
    u32 clear_rx_cs;
};

🎀 Members 🎀

• prepare_cs — precalculated CS register value for ->prepare_message; it uses the target-specific clock polarity and phase settings, periodt ⭐
• clear_rx_desc — a preallocated RX DMA descriptor used for TX-only transfers. the way it cyclically clears the RX FIFO by writing clear_rx_cs to the CS register? obsessed 😭✨
• clear_rx_addr — bus address of clear_rx_cs, literally 🫶
• clear_rx_cs — precalculated CS register value to clear the RX FIFO; it uses the target-specific clock polarity and phase settings 💖

🔥 SEE ALSO 🔥

• Kernel file ./drivers/spi/spi-bcm2835.c struct bcm2835_spi(9)
• bcm2835_rd_fifo_count(9)
• bcm2835_wr_fifo_count(9)
• bcm2835_wait_tx_fifo_empty(9)
• bcm2835_rd_fifo_blind(9)
• bcm2835_wr_fifo_blind(9)
• bcm2835_spi_transfer_prologue(9)
• bcm2835_spi_undo_prologue(9)
• bcm2835_spi_dma_rx_done(9)
• bcm2835_spi_dma_tx_done(9)
• bcm2835_spi_prepare_sg(9)
• bcm2835_spi_transfer_one_dma(9)

and that's the whole vibe check, bestie 🦋 source/version: ./drivers/spi; date: October 2026; page: struct bcm2835_spidev(9) 💜