i2c: Add a DM_I2C driver for the sun8i RSB 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 rsb 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, so move that to the common header.
There are only a couple of pairs of hardware/runtime addresses used
across all PMIC variants. So far the code expected only the "primary"
pair, but some PMICs like the AXP305 and AXP805 use the secondary pair,
so add support for that to the DM driver as well.
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 0adf143..66bd6fe 100644
--- a/drivers/i2c/Kconfig
+++ b/drivers/i2c/Kconfig
@@ -583,6 +583,14 @@
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_SUN8I_RSB
+ bool "Allwinner sun8i Reduced Serial Bus controller"
+ depends on ARCH_SUNXI
+ help
+ Support for Allwinner's Reduced Serial Bus (RSB) controller. This
+ controller is responsible for communicating with various RSB based
+ devices, such as X-Powers AXPxxx PMICs and AC100/AC200 CODEC ICs.
+
config SYS_I2C_SYNQUACER
bool "Socionext SynQuacer I2C controller"
depends on ARCH_SYNQUACER && DM_I2C