[PATCH v9 2/3] mfd: axp20x: Add support for AXP313a PMIC

[Andre Przywara]

From: Martin Botka <martin.botka@xxxxxxxxxxxxxx>

The AXP313a is a PMIC chip produced by X-Powers, it can be connected via
an I2C bus.
The name AXP1530 seems to appear as well, and this is what is used in
the BSP driver. From all we know it's the same chip, just a different
name. However we have only seen AXP313a chips in the wild, so go with
this name.

Compared to the other AXP PMICs it's a rather simple affair: just three
DCDC converters, three LDOs, and no battery charging support.

Describe the regmap and the MFD bits, along with the registers exposed
via I2C. Aside from the various regulators, also describe the power key
interrupts, and adjust the shutdown handler routine to use a different
register than the other PMICs.
Eventually advertise the device using the new compatible string.

Signed-off-by: Martin Botka <martin.botka@xxxxxxxxxxxxxx>
Signed-off-by: Andre Przywara <andre.przywara@xxxxxxx>
---
 drivers/mfd/axp20x-i2c.c   |  2 +
 drivers/mfd/axp20x.c       | 82 +++++++++++++++++++++++++++++++++++++-
 include/linux/mfd/axp20x.h | 32 +++++++++++++++
 3 files changed, 115 insertions(+), 1 deletion(-)

diff --git a/drivers/mfd/axp20x-i2c.c b/drivers/mfd/axp20x-i2c.c
index f49fbd3079589..f061177cb18e5 100644
--- a/drivers/mfd/axp20x-i2c.c
+++ b/drivers/mfd/axp20x-i2c.c
@@ -63,6 +63,7 @@ static const struct of_device_id axp20x_i2c_of_match[] = {
 	{ .compatible = "x-powers,axp209", .data = (void *)AXP209_ID },
 	{ .compatible = "x-powers,axp221", .data = (void *)AXP221_ID },
 	{ .compatible = "x-powers,axp223", .data = (void *)AXP223_ID },
+	{ .compatible = "x-powers,axp313a", .data = (void *)AXP313A_ID },
 	{ .compatible = "x-powers,axp803", .data = (void *)AXP803_ID },
 	{ .compatible = "x-powers,axp806", .data = (void *)AXP806_ID },
 	{ },
@@ -76,6 +77,7 @@ static const struct i2c_device_id axp20x_i2c_id[] = {
 	{ "axp209", 0 },
 	{ "axp221", 0 },
 	{ "axp223", 0 },
+	{ "axp313a", 0 },
 	{ "axp803", 0 },
 	{ "axp806", 0 },
 	{ },
diff --git a/drivers/mfd/axp20x.c b/drivers/mfd/axp20x.c
index 01a6bbb6d266d..c4325977e384b 100644
--- a/drivers/mfd/axp20x.c
+++ b/drivers/mfd/axp20x.c
@@ -39,6 +39,7 @@ static const char * const axp20x_model_names[] = {
 	"AXP221",
 	"AXP223",
 	"AXP288",
+	"AXP313a",
 	"AXP803",
 	"AXP806",
 	"AXP809",
@@ -154,6 +155,25 @@ static const struct regmap_range axp806_writeable_ranges[] = {
 	regmap_reg_range(AXP806_REG_ADDR_EXT, AXP806_REG_ADDR_EXT),
 };
 
+static const struct regmap_range axp313a_writeable_ranges[] = {
+	regmap_reg_range(AXP313A_ON_INDICATE, AXP313A_IRQ_STATE),
+};
+
+static const struct regmap_range axp313a_volatile_ranges[] = {
+	regmap_reg_range(AXP313A_SHUTDOWN_CTRL, AXP313A_SHUTDOWN_CTRL),
+	regmap_reg_range(AXP313A_IRQ_STATE, AXP313A_IRQ_STATE),
+};
+
+static const struct regmap_access_table axp313a_writeable_table = {
+	.yes_ranges = axp313a_writeable_ranges,
+	.n_yes_ranges = ARRAY_SIZE(axp313a_writeable_ranges),
+};
+
+static const struct regmap_access_table axp313a_volatile_table = {
+	.yes_ranges = axp313a_volatile_ranges,
+	.n_yes_ranges = ARRAY_SIZE(axp313a_volatile_ranges),
+};
+
 static const struct regmap_range axp806_volatile_ranges[] = {
 	regmap_reg_range(AXP20X_IRQ1_STATE, AXP20X_IRQ2_STATE),
 };
@@ -221,6 +241,11 @@ static const struct resource axp288_fuel_gauge_resources[] = {
 	DEFINE_RES_IRQ(AXP288_IRQ_WL1),
 };
 
+static const struct resource axp313a_pek_resources[] = {
+	DEFINE_RES_IRQ_NAMED(AXP313A_IRQ_PEK_RIS_EDGE, "PEK_DBR"),
+	DEFINE_RES_IRQ_NAMED(AXP313A_IRQ_PEK_FAL_EDGE, "PEK_DBF"),
+};
+
 static const struct resource axp803_pek_resources[] = {
 	DEFINE_RES_IRQ_NAMED(AXP803_IRQ_PEK_RIS_EDGE, "PEK_DBR"),
 	DEFINE_RES_IRQ_NAMED(AXP803_IRQ_PEK_FAL_EDGE, "PEK_DBF"),
@@ -272,6 +297,15 @@ static const struct regmap_config axp288_regmap_config = {
 	.cache_type	= REGCACHE_RBTREE,
 };
 
+static const struct regmap_config axp313a_regmap_config = {
+	.reg_bits = 8,
+	.val_bits = 8,
+	.wr_table = &axp313a_writeable_table,
+	.volatile_table = &axp313a_volatile_table,
+	.max_register = AXP313A_IRQ_STATE,
+	.cache_type = REGCACHE_RBTREE,
+};
+
 static const struct regmap_config axp806_regmap_config = {
 	.reg_bits	= 8,
 	.val_bits	= 8,
@@ -415,6 +449,16 @@ static const struct regmap_irq axp288_regmap_irqs[] = {
 	INIT_REGMAP_IRQ(AXP288, BC_USB_CHNG,            5, 1),
 };
 
+static const struct regmap_irq axp313a_regmap_irqs[] = {
+	INIT_REGMAP_IRQ(AXP313A, PEK_RIS_EDGE,		0, 7),
+	INIT_REGMAP_IRQ(AXP313A, PEK_FAL_EDGE,		0, 6),
+	INIT_REGMAP_IRQ(AXP313A, PEK_SHORT,		0, 5),
+	INIT_REGMAP_IRQ(AXP313A, PEK_LONG,		0, 4),
+	INIT_REGMAP_IRQ(AXP313A, DCDC3_V_LOW,		0, 3),
+	INIT_REGMAP_IRQ(AXP313A, DCDC2_V_LOW,		0, 2),
+	INIT_REGMAP_IRQ(AXP313A, DIE_TEMP_HIGH,		0, 0),
+};
+
 static const struct regmap_irq axp803_regmap_irqs[] = {
 	INIT_REGMAP_IRQ(AXP803, ACIN_OVER_V,		0, 7),
 	INIT_REGMAP_IRQ(AXP803, ACIN_PLUGIN,		0, 6),
@@ -548,6 +592,17 @@ static const struct regmap_irq_chip axp288_regmap_irq_chip = {
 
 };
 
+static const struct regmap_irq_chip axp313a_regmap_irq_chip = {
+	.name			= "axp313a_irq_chip",
+	.status_base		= AXP313A_IRQ_STATE,
+	.ack_base		= AXP313A_IRQ_STATE,
+	.unmask_base		= AXP313A_IRQ_EN,
+	.init_ack_masked	= true,
+	.irqs			= axp313a_regmap_irqs,
+	.num_irqs		= ARRAY_SIZE(axp313a_regmap_irqs),
+	.num_regs		= 1,
+};
+
 static const struct regmap_irq_chip axp803_regmap_irq_chip = {
 	.name			= "axp803",
 	.status_base		= AXP20X_IRQ1_STATE,
@@ -676,6 +731,15 @@ static const struct mfd_cell axp152_cells[] = {
 	},
 };
 
+static struct mfd_cell axp313a_cells[] = {
+	MFD_CELL_NAME("axp20x-regulator"),
+	{
+		.name		= "axp313a-pek",
+		.num_resources	= ARRAY_SIZE(axp313a_pek_resources),
+		.resources	= axp313a_pek_resources,
+	},
+};
+
 static const struct resource axp288_adc_resources[] = {
 	DEFINE_RES_IRQ_NAMED(AXP288_IRQ_GPADC, "GPADC"),
 };
@@ -828,8 +892,18 @@ static const struct mfd_cell axp813_cells[] = {
 static int axp20x_power_off(struct sys_off_data *data)
 {
 	struct axp20x_dev *axp20x = data->cb_data;
+	unsigned int shutdown_reg;
 
-	regmap_write(axp20x->regmap, AXP20X_OFF_CTRL, AXP20X_OFF);
+	switch (axp20x->variant) {
+	case AXP313A_ID:
+		shutdown_reg = AXP313A_SHUTDOWN_CTRL;
+		break;
+	default:
+		shutdown_reg = AXP20X_OFF_CTRL;
+		break;
+	}
+
+	regmap_write(axp20x->regmap, shutdown_reg, AXP20X_OFF);
 
 	/* Give capacitors etc. time to drain to avoid kernel panic msg. */
 	mdelay(500);
@@ -892,6 +966,12 @@ int axp20x_match_device(struct axp20x_dev *axp20x)
 		axp20x->regmap_irq_chip = &axp288_regmap_irq_chip;
 		axp20x->irq_flags = IRQF_TRIGGER_LOW;
 		break;
+	case AXP313A_ID:
+		axp20x->nr_cells = ARRAY_SIZE(axp313a_cells);
+		axp20x->cells = axp313a_cells;
+		axp20x->regmap_cfg = &axp313a_regmap_config;
+		axp20x->regmap_irq_chip = &axp313a_regmap_irq_chip;
+		break;
 	case AXP803_ID:
 		axp20x->nr_cells = ARRAY_SIZE(axp803_cells);
 		axp20x->cells = axp803_cells;
diff --git a/include/linux/mfd/axp20x.h b/include/linux/mfd/axp20x.h
index 2058194807bd2..edd7fdcc33f91 100644
--- a/include/linux/mfd/axp20x.h
+++ b/include/linux/mfd/axp20x.h
@@ -17,6 +17,7 @@ enum axp20x_variants {
 	AXP221_ID,
 	AXP223_ID,
 	AXP288_ID,
+	AXP313A_ID,
 	AXP803_ID,
 	AXP806_ID,
 	AXP809_ID,
@@ -91,6 +92,17 @@ enum axp20x_variants {
 #define AXP22X_ALDO3_V_OUT		0x2a
 #define AXP22X_CHRG_CTRL3		0x35
 
+#define AXP313A_ON_INDICATE		0x00
+#define AXP313A_OUTPUT_CONTROL		0x10
+#define AXP313A_DCDC1_CONRTOL		0x13
+#define AXP313A_DCDC2_CONRTOL		0x14
+#define AXP313A_DCDC3_CONRTOL		0x15
+#define AXP313A_ALDO1_CONRTOL		0x16
+#define AXP313A_DLDO1_CONRTOL		0x17
+#define AXP313A_SHUTDOWN_CTRL		0x1a
+#define AXP313A_IRQ_EN			0x20
+#define AXP313A_IRQ_STATE		0x21
+
 #define AXP806_STARTUP_SRC		0x00
 #define AXP806_CHIP_ID			0x03
 #define AXP806_PWR_OUT_CTRL1		0x10
@@ -322,6 +334,16 @@ enum {
 	AXP22X_REG_ID_MAX,
 };
 
+enum {
+	AXP313A_DCDC1 = 0,
+	AXP313A_DCDC2,
+	AXP313A_DCDC3,
+	AXP313A_ALDO1,
+	AXP313A_DLDO1,
+	AXP313A_RTC_LDO,
+	AXP313A_REG_ID_MAX,
+};
+
 enum {
 	AXP806_DCDCA = 0,
 	AXP806_DCDCB,
@@ -548,6 +570,16 @@ enum axp288_irqs {
 	AXP288_IRQ_BC_USB_CHNG,
 };
 
+enum axp313a_irqs {
+	AXP313A_IRQ_DIE_TEMP_HIGH,
+	AXP313A_IRQ_DCDC2_V_LOW = 2,
+	AXP313A_IRQ_DCDC3_V_LOW,
+	AXP313A_IRQ_PEK_LONG,
+	AXP313A_IRQ_PEK_SHORT,
+	AXP313A_IRQ_PEK_FAL_EDGE,
+	AXP313A_IRQ_PEK_RIS_EDGE,
+};
+
 enum axp803_irqs {
 	AXP803_IRQ_ACIN_OVER_V = 1,
 	AXP803_IRQ_ACIN_PLUGIN,
-- 
2.25.1