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mfd: axp20x: Add address extension registers for AXP806 regmap

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The AXP806 supports either master/standalone or slave mode.
Slave mode allows sharing the serial bus, even with multiple
AXP806 which all have the same hardware address.

This is done with extra "serial interface address extension",
or AXP806_BUS_ADDR_EXT, and "register address extension", or
AXP806_REG_ADDR_EXT, registers. The former is read-only, with
1 bit customizable at the factory, and 1 bit depending on the
state of an external pin. The latter is writable. Only when
the these device addressing bits (in the upper 4 bits of the
registers) match, will the device respond to operations on
its other registers.

Add these 2 registers to the regmap so we can access them.

Signed-off-by: Chen-Yu Tsai <wens@csie.org>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
This commit is contained in:
Chen-Yu Tsai 2016-11-11 11:29:52 +08:00 committed by Lee Jones
parent f57576e73c
commit 34d9030b5d
2 changed files with 4 additions and 1 deletions
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3
drivers/mfd/axp20x.c
View File

@ -136,6 +136,7 @@ static const struct regmap_range axp806_writeable_ranges[] = {
regmap_reg_range(AXP806_PWR_OUT_CTRL1, AXP806_CLDO3_V_CTRL),
regmap_reg_range(AXP20X_IRQ1_EN, AXP20X_IRQ2_EN),
regmap_reg_range(AXP20X_IRQ1_STATE, AXP20X_IRQ2_STATE),
regmap_reg_range(AXP806_REG_ADDR_EXT, AXP806_REG_ADDR_EXT),
};
static const struct regmap_range axp806_volatile_ranges[] = {
@ -306,7 +307,7 @@ static const struct regmap_config axp806_regmap_config = {
.val_bits = 8,
.wr_table = &axp806_writeable_table,
.volatile_table = &axp806_volatile_table,
.max_register = AXP806_VREF_TEMP_WARN_L,
.max_register = AXP806_REG_ADDR_EXT,
.cache_type = REGCACHE_RBTREE,
};

2
include/linux/mfd/axp20x.h
View File

@ -115,6 +115,8 @@ enum {
#define AXP806_CLDO2_V_CTRL 0x25
#define AXP806_CLDO3_V_CTRL 0x26
#define AXP806_VREF_TEMP_WARN_L 0xf3
#define AXP806_BUS_ADDR_EXT 0xfe
#define AXP806_REG_ADDR_EXT 0xff
/* Interrupt */
#define AXP152_IRQ1_EN 0x40