i2c: xiic: Add Xilinx AXI I2C driver
Add Xilinx AXI I2C controller driver based on the Linux i2c-xiic driver.
This driver is stripped of all the IRQ handling and uses pure polling,
yet tries to retain most of the structure of the Linux driver to make
backporting of fixes easy.
Note that the IP has a known limitation on 255 bytes read and write,
according to xilinx this is still being worked on [1].
[1] https://forums.xilinx.com/t5/Embedded-Processor-System-Design/AXI-IIC-V2-0-I2C-Master-Reading-multiple-bytes-from-I2C-slave/m-p/854419/highlight/true#M39387
Signed-off-by: Marek Vasut <marex@denx.de>
Cc: Michal Simek <monstr@monstr.eu>
Cc: Michal Simek <michal.simek@xilinx.com>
Cc: Heiko Schocher <hs@denx.de>
Reviewed-by: Heiko Schocher <hs@denx.de>
diff --git a/drivers/i2c/Kconfig b/drivers/i2c/Kconfig
index 1ef22e6..5366171 100644
--- a/drivers/i2c/Kconfig
+++ b/drivers/i2c/Kconfig
@@ -450,6 +450,12 @@
help
Define the maximum number of available I2C buses.
+config SYS_I2C_XILINX_XIIC
+ bool "Xilinx AXI I2C driver"
+ depends on DM_I2C
+ help
+ Support for Xilinx AXI I2C controller.
+
config SYS_I2C_ZYNQ
bool "Xilinx I2C driver"
depends on ARCH_ZYNQMP || ARCH_ZYNQ