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| author | Hector Martin <marcan@marcan.st> | 2024-11-06 08:54:01 +0100 |
|---|---|---|
| committer | Mark Brown <broonie@kernel.org> | 2024-11-06 14:15:39 +0000 |
| commit | c36212b2610d09eb42142beb0d5613c70206c658 (patch) | |
| tree | 253c700603d8d958e67fd93fe2bcf83e0aa92834 /drivers/spi/Kconfig | |
| parent | 18096d339206de6cdb48500b2c3ad5ad0b48aad7 (diff) | |
| download | lwn-c36212b2610d09eb42142beb0d5613c70206c658.tar.gz lwn-c36212b2610d09eb42142beb0d5613c70206c658.zip | |
spi: apple: Add driver for Apple SPI controller
This SPI controller is present in Apple SoCs such as the M1 (t8103) and
M1 Pro/Max (t600x). It is a relatively straightforward design with two
16-entry FIFOs, arbitrary transfer sizes (up to 2**32 - 1) and fully
configurable word size up to 32 bits. It supports one hardware CS line
which can also be driven via the pinctrl/GPIO driver instead, if
desired. TX and RX can be independently enabled.
There are a surprising number of knobs for tweaking details of the
transfer, most of which we do not use right now. Hardware CS control
is available, but we haven't found a way to make it stay low across
multiple logical transfers, so we just use software CS control for now.
There is also a shared DMA offload coprocessor that can be used to handle
larger transfers without requiring an IRQ every 8-16 words, but that
feature depends on a bunch of scaffolding that isn't ready to be
upstreamed yet, so leave it for later.
The hardware shares some register bit definitions with spi-s3c24xx which
suggests it has a shared legacy with Samsung SoCs, but it is too
different to warrant sharing a driver.
Signed-off-by: Hector Martin <marcan@marcan.st>
Signed-off-by: Janne Grunau <j@jannau.net>
Link: https://patch.msgid.link/20241106-asahi-spi-v5-2-e81a4f3a8e19@jannau.net
Signed-off-by: Mark Brown <broonie@kernel.org>
Diffstat (limited to 'drivers/spi/Kconfig')
| -rw-r--r-- | drivers/spi/Kconfig | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/drivers/spi/Kconfig b/drivers/spi/Kconfig index 7133bb72d1c8..f51f9466e518 100644 --- a/drivers/spi/Kconfig +++ b/drivers/spi/Kconfig @@ -96,6 +96,17 @@ config SPI_AMLOGIC_SPIFC_A1 This enables master mode support for the SPIFC (SPI flash controller) available in Amlogic A1 (A113L SoC). +config SPI_APPLE + tristate "Apple SoC SPI Controller platform driver" + depends on ARCH_APPLE || COMPILE_TEST + help + This enables support for the SPI controller present on + many Apple SoCs, including the t8103 (M1), t8112 (M2) + and t600x (M1 Pro/Max/Ultra). Multiple SPI controller + instances are present on the SoC and each connects usually + to a single device like spi-nor (nvram), input device controller + or fingerprint sensor. + config SPI_AR934X tristate "Qualcomm Atheros AR934X/QCA95XX SPI controller driver" depends on ATH79 || COMPILE_TEST |