[PATCH v5 06/20] mfd: adp5585: refactor how regmap defaults are handled

["Nuno Sá via B4 Relay" <devnull+nuno.sa.analog.com@kernel.org>]

From: Nuno Sá <nuno.sa@analog.com>

The only thing changing between variants is the regmap default
registers. Hence, instead of having a regmap configuration for every
variant (duplicating lots of fields), add a chip info type of structure
with a regmap ID to identify which defaults to use and populate
regmap_config at runtime given a template plus the id. Also note that
between variants, the defaults can be the same which means the chip info
structure can be used in more than one compatible.

This will also make it simpler adding new chips with more variants.

Also note that the chip info structures are deliberately not const as
they will also contain lots of members that are the same between the
different devices variants and so we will fill those at runtime.

Signed-off-by: Nuno Sá <nuno.sa@analog.com>
---
 drivers/mfd/adp5585.c       | 81 +++++++++++++++++++++++----------------------
 include/linux/mfd/adp5585.h | 11 ++++++
 2 files changed, 53 insertions(+), 39 deletions(-)

diff --git a/drivers/mfd/adp5585.c b/drivers/mfd/adp5585.c
index c764f481875831ff55bccb8cdc59421719afbedd..ec88adbace92791f10953fc2bbb463fc59557bd6 100644
--- a/drivers/mfd/adp5585.c
+++ b/drivers/mfd/adp5585.c
@@ -81,42 +81,37 @@ static const u8 adp5585_regmap_defaults_04[ADP5585_MAX_REG + 1] = {
 	/* 0x38 */ 0x00, 0x00, 0x00, 0x00, 0x00,
 };
 
-enum adp5585_regmap_type {
-	ADP5585_REGMAP_00,
-	ADP5585_REGMAP_02,
-	ADP5585_REGMAP_04,
+/* -1 since the enum starts at 1 for error checking in i2c_get_match_data() */
+static const u8 *adp5585_regmap_defaults[ADP5585_MAX] = {
+	[ADP5585_00] = adp5585_regmap_defaults_00,
+	[ADP5585_01] = adp5585_regmap_defaults_00,
+	[ADP5585_02] = adp5585_regmap_defaults_02,
+	[ADP5585_03] = adp5585_regmap_defaults_00,
+	[ADP5585_04] = adp5585_regmap_defaults_04,
 };
 
-static const struct regmap_config adp5585_regmap_configs[] = {
-	[ADP5585_REGMAP_00] = {
-		.reg_bits = 8,
-		.val_bits = 8,
-		.max_register = ADP5585_MAX_REG,
-		.volatile_table = &adp5585_volatile_regs,
-		.cache_type = REGCACHE_MAPLE,
-		.reg_defaults_raw = adp5585_regmap_defaults_00,
-		.num_reg_defaults_raw = sizeof(adp5585_regmap_defaults_00),
-	},
-	[ADP5585_REGMAP_02] = {
-		.reg_bits = 8,
-		.val_bits = 8,
-		.max_register = ADP5585_MAX_REG,
-		.volatile_table = &adp5585_volatile_regs,
-		.cache_type = REGCACHE_MAPLE,
-		.reg_defaults_raw = adp5585_regmap_defaults_02,
-		.num_reg_defaults_raw = sizeof(adp5585_regmap_defaults_02),
-	},
-	[ADP5585_REGMAP_04] = {
-		.reg_bits = 8,
-		.val_bits = 8,
-		.max_register = ADP5585_MAX_REG,
-		.volatile_table = &adp5585_volatile_regs,
-		.cache_type = REGCACHE_MAPLE,
-		.reg_defaults_raw = adp5585_regmap_defaults_04,
-		.num_reg_defaults_raw = sizeof(adp5585_regmap_defaults_04),
-	},
+static const struct regmap_config adp5585_regmap_config_template = {
+	.reg_bits = 8,
+	.val_bits = 8,
+	.max_register = ADP5585_MAX_REG,
+	.volatile_table = &adp5585_volatile_regs,
+	.cache_type = REGCACHE_MAPLE,
+	.num_reg_defaults_raw = ADP5585_MAX_REG + 1,
 };
 
+static struct regmap_config *adp5585_fill_regmap_config(const struct adp5585_dev *adp5585)
+{
+	struct regmap_config *regmap_config;
+
+	regmap_config = devm_kmemdup(adp5585->dev, &adp5585_regmap_config_template,
+				     sizeof(struct regmap_config), GFP_KERNEL);
+	if (!regmap_config)
+		return ERR_PTR(-ENOMEM);
+
+	regmap_config->reg_defaults_raw = adp5585_regmap_defaults[adp5585->variant];
+	return regmap_config;
+}
+
 static int adp5585_add_devices(struct device *dev)
 {
 	int ret;
@@ -147,7 +142,7 @@ static void adp5585_osc_disable(void *data)
 
 static int adp5585_i2c_probe(struct i2c_client *i2c)
 {
-	const struct regmap_config *regmap_config;
+	struct regmap_config *regmap_config;
 	struct adp5585_dev *adp5585;
 	unsigned int id;
 	int ret;
@@ -157,8 +152,16 @@ static int adp5585_i2c_probe(struct i2c_client *i2c)
 		return -ENOMEM;
 
 	i2c_set_clientdata(i2c, adp5585);
+	adp5585->dev = &i2c->dev;
+
+	adp5585->variant = (enum adp5585_variant)(uintptr_t)i2c_get_match_data(i2c);
+	if (!adp5585->variant)
+		return -ENODEV;
+
+	regmap_config = adp5585_fill_regmap_config(adp5585);
+	if (IS_ERR(regmap_config))
+		return PTR_ERR(regmap_config);
 
-	regmap_config = i2c_get_match_data(i2c);
 	adp5585->regmap = devm_regmap_init_i2c(i2c, regmap_config);
 	if (IS_ERR(adp5585->regmap))
 		return dev_err_probe(&i2c->dev, PTR_ERR(adp5585->regmap),
@@ -212,19 +215,19 @@ static DEFINE_SIMPLE_DEV_PM_OPS(adp5585_pm, adp5585_suspend, adp5585_resume);
 static const struct of_device_id adp5585_of_match[] = {
 	{
 		.compatible = "adi,adp5585-00",
-		.data = &adp5585_regmap_configs[ADP5585_REGMAP_00],
+		.data = (void *)ADP5585_00,
 	}, {
 		.compatible = "adi,adp5585-01",
-		.data = &adp5585_regmap_configs[ADP5585_REGMAP_00],
+		.data = (void *)ADP5585_01,
 	}, {
 		.compatible = "adi,adp5585-02",
-		.data = &adp5585_regmap_configs[ADP5585_REGMAP_02],
+		.data = (void *)ADP5585_02,
 	}, {
 		.compatible = "adi,adp5585-03",
-		.data = &adp5585_regmap_configs[ADP5585_REGMAP_00],
+		.data = (void *)ADP5585_03,
 	}, {
 		.compatible = "adi,adp5585-04",
-		.data = &adp5585_regmap_configs[ADP5585_REGMAP_04],
+		.data = (void *)ADP5585_04,
 	},
 	{ /* sentinel */ }
 };
diff --git a/include/linux/mfd/adp5585.h b/include/linux/mfd/adp5585.h
index 016033cd68e46757aca86d21dd37025fd354b801..c56af8d8d76c4ebc0ede1ee4769ca059de29f53c 100644
--- a/include/linux/mfd/adp5585.h
+++ b/include/linux/mfd/adp5585.h
@@ -119,8 +119,19 @@
 
 struct regmap;
 
+enum adp5585_variant {
+	ADP5585_00 = 1,
+	ADP5585_01,
+	ADP5585_02,
+	ADP5585_03,
+	ADP5585_04,
+	ADP5585_MAX
+};
+
 struct adp5585_dev {
+	struct device *dev;
 	struct regmap *regmap;
+	enum adp5585_variant variant;
 };
 
 #endif

-- 
2.49.0