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The Linux kernel configuration item CONFIG_SPI_DW_BT1
:
CONFIG_MIPS_BAIKAL_T1 || CONFIG_COMPILE_TEST
spi-dw-bt1
Baikal-T1 SoC is equipped with three DW APB SSI-based MMIO SPI controllers. Two of them are pretty much normal: with IRQ, DMA, FIFOs of 64 words depth, 4x CSs, but the third one as being a part of the Baikal-T1 System Boot Controller has got a very limited resources: no IRQ, no DMA, only a single native chip-select and Tx/Rx FIFO with just 8 words depth available. The later one is normally connected to an external SPI-nor flash of 128Mb (in general can be of bigger size).
Raw data from LKDDb:
lkddb module spi-dw-bt1 CONFIG_SPI_DW_BT1 : drivers/spi/Kconfig : "Baikal-T1 SPI driver for DW SPI core" # in 5.10–5.19, 6.0–6.10, 6.11-rc+HEAD
lkddb of "" "" "baikal,bt1-ssi" : CONFIG_SPI CONFIG_SPI_DW_BT1 : drivers/spi/spi-dw-bt1.c # in 5.10–5.19, 6.0–6.10, 6.11-rc+HEAD
lkddb of "" "" "baikal,bt1-sys-ssi" : CONFIG_SPI CONFIG_SPI_DW_BT1 : drivers/spi/spi-dw-bt1.c # in 5.10–5.19, 6.0–6.10, 6.11-rc+HEAD
lkddb platform "bt1-sys-ssi" : CONFIG_SPI CONFIG_SPI_DW_BT1 : drivers/spi/spi-dw-bt1.c # in 5.10–5.19, 6.0–6.10, 6.11-rc+HEAD
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