i2c: Add a DM_I2C driver for the sun6i P2WI controller
This bus controller is used to communicate with an X-Powers AXP PMIC.
Currently, various drivers access PMIC registers through a platform-
specific non-DM "pmic_bus" interface, which depends on the legacy I2C
framework. In order to convert those drivers to use DM_PMIC, this bus
needs a DM_I2C driver.
Refactor the p2wi functions to take the base address as a parameter,
and implement both the existing interface (which is still needed in
SPL) and the DM_I2C interface on top of them.
The register for switching between I2C/P2WI/RSB mode is the same across
all PMIC variants. Move that to the common header, so it can be used by
both interface implementations.
Signed-off-by: Samuel Holland <samuel@sholland.org>
Reviewed-by: Andre Przywara <andre.przywara@arm.com>
Signed-off-by: Andre Przywara <andre.przywara@arm.com>
diff --git a/drivers/i2c/Kconfig b/drivers/i2c/Kconfig
index 57cac44..0adf143 100644
--- a/drivers/i2c/Kconfig
+++ b/drivers/i2c/Kconfig
@@ -575,6 +575,14 @@
_ Optional clock stretching
_ Software reset
+config SYS_I2C_SUN6I_P2WI
+ bool "Allwinner sun6i P2WI controller"
+ depends on ARCH_SUNXI
+ help
+ Support for the P2WI (Push/Pull 2 Wire Interface) controller embedded
+ in the Allwinner A31 and A31s SOCs. This interface is used to connect
+ to specific devices like the X-Powers AXP221 PMIC.
+
config SYS_I2C_SYNQUACER
bool "Socionext SynQuacer I2C controller"
depends on ARCH_SYNQUACER && DM_I2C