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lib: utils/i2c: add minimal SpacemiT I2C driver

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Add a simple SpacemiT I2C driver for basic byte transfers over the I2C
bus, prioritizing simplicity over performance. The driver operates in
PIO mode and does not use interrupts, FIFO, or DMA.

The controller is reset at the start of each transaction to ensure a
known initial state, regardless of prior configuration by the kernel.
This also avoids the need for additional error recovery code.

This will be used for communication with onboard PMIC to reset and
power-off the board.

Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>
Tested-by: Anand Moon <linux.amoon@gmail.com>
Link: https://lore.kernel.org/r/20260419150857.2705843-2-aurelien@aurel32.net
Signed-off-by: Anup Patel <anup@brainfault.org>
This commit is contained in:
Aurelien Jarno
2026-04-19 16:49:19 +02:00
committed by Anup Patel
parent 5f13f9e13f
commit b10e18ec85
4 changed files with 228 additions and 0 deletions
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lib/utils/i2c/objects.mk
+3
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@@ -15,6 +15,9 @@ libsbiutils-objs-$(CONFIG_FDT_I2C) += i2c/fdt_i2c_adapter_drivers.carray.o
carray-fdt_i2c_adapter_drivers-$(CONFIG_FDT_I2C_SIFIVE) += fdt_i2c_adapter_sifive
libsbiutils-objs-$(CONFIG_FDT_I2C_SIFIVE) += i2c/fdt_i2c_sifive.o
carray-fdt_i2c_adapter_drivers-$(CONFIG_FDT_I2C_SPACEMIT) += fdt_i2c_adapter_spacemit
libsbiutils-objs-$(CONFIG_FDT_I2C_SPACEMIT) += i2c/fdt_i2c_spacemit.o
carray-fdt_i2c_adapter_drivers-$(CONFIG_FDT_I2C_DW) += fdt_i2c_adapter_dw
libsbiutils-objs-$(CONFIG_FDT_I2C_DW) += i2c/fdt_i2c_dw.o