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i2c: Add a DM_I2C driver for the sun6i P2WI controller

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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>
This commit is contained in:
Samuel Holland
2021-10-08 00:17:20 -05:00
committed by Andre Przywara
parent 4ab39e74b6
commit 104950a7fe
8 changed files with 240 additions and 134 deletions
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6
include/axp_pmic.h
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@@ -6,6 +6,8 @@
*/
#ifndef _AXP_PMIC_H_
#include <stdbool.h>
#ifdef CONFIG_AXP152_POWER
#include <axp152.h>
#endif
@@ -25,6 +27,10 @@
#include <axp818.h>
#endif
#define AXP_PMIC_MODE_REG 0x3e
#define AXP_PMIC_MODE_I2C 0x00
#define AXP_PMIC_MODE_P2WI 0x3e
int axp_set_dcdc1(unsigned int mvolt);
int axp_set_dcdc2(unsigned int mvolt);
int axp_set_dcdc3(unsigned int mvolt);