mfd: bd718x7: simplify by cleaning unnecessary device data

Most ROHM PMIC sub-devices only use the regmap pointer from
parent device. They can obtain this by dev_get_regamap so in
most cases the MFD device does not need to allocate and populate
the driver data. Simplify drivers by removing this.

The BD70528 still needs the access to watchdog mutex so keep
rohm_regmap_dev in use on BD70528 RTC and WDG drivers for now.

Signed-off-by: Matti Vaittinen <[e-mail]>
Signed-off-by: Lee Jones <[e-mail]>

drivers/mfd/rohm-bd718x7.c

···
 	.cache_type = REGCACHE_RBTREE,
 };
 
-static int bd718xx_init_press_duration(struct bd718xx *bd718xx)
+static int bd718xx_init_press_duration(struct regmap *regmap,
+				       struct device *dev)
 {
-	struct device* dev = bd718xx->chip.dev;
 	u32 short_press_ms, long_press_ms;
 	u32 short_press_value, long_press_value;
 	int ret;
···
 				   &short_press_ms);
 	if (!ret) {
 		short_press_value = min(15u, (short_press_ms + 250) / 500);
-		ret = regmap_update_bits(bd718xx->chip.regmap,
-					 BD718XX_REG_PWRONCONFIG0,
+		ret = regmap_update_bits(regmap, BD718XX_REG_PWRONCONFIG0,
 					 BD718XX_PWRBTN_PRESS_DURATION_MASK,
 					 short_press_value);
 		if (ret) {
···
 				   &long_press_ms);
 	if (!ret) {
 		long_press_value = min(15u, (long_press_ms + 500) / 1000);
-		ret = regmap_update_bits(bd718xx->chip.regmap,
-					 BD718XX_REG_PWRONCONFIG1,
+		ret = regmap_update_bits(regmap, BD718XX_REG_PWRONCONFIG1,
 					 BD718XX_PWRBTN_PRESS_DURATION_MASK,
 					 long_press_value);
 		if (ret) {
···
 static int bd718xx_i2c_probe(struct i2c_client *i2c,
 			    const struct i2c_device_id *id)
 {
-	struct bd718xx *bd718xx;
+	struct regmap *regmap;
+	struct regmap_irq_chip_data *irq_data;
 	int ret;
 	unsigned int chip_type;
 	struct mfd_cell *mfd;
···
 		dev_err(&i2c->dev, "No IRQ configured\n");
 		return -EINVAL;
 	}
-
-	bd718xx = devm_kzalloc(&i2c->dev, sizeof(struct bd718xx), GFP_KERNEL);
-
-	if (!bd718xx)
-		return -ENOMEM;
-
-	bd718xx->chip_irq = i2c->irq;
 	chip_type = (unsigned int)(uintptr_t)
 		    of_device_get_match_data(&i2c->dev);
 	switch (chip_type) {
···
 		dev_err(&i2c->dev, "Unknown device type");
 		return -EINVAL;
 	}
-	bd718xx->chip.dev = &i2c->dev;
-	dev_set_drvdata(&i2c->dev, bd718xx);
 
-	bd718xx->chip.regmap = devm_regmap_init_i2c(i2c,
-						    &bd718xx_regmap_config);
-	if (IS_ERR(bd718xx->chip.regmap)) {
+	regmap = devm_regmap_init_i2c(i2c, &bd718xx_regmap_config);
+	if (IS_ERR(regmap)) {
 		dev_err(&i2c->dev, "regmap initialization failed\n");
-		return PTR_ERR(bd718xx->chip.regmap);
+		return PTR_ERR(regmap);
 	}
 
-	ret = devm_regmap_add_irq_chip(&i2c->dev, bd718xx->chip.regmap,
-				       bd718xx->chip_irq, IRQF_ONESHOT, 0,
-				       &bd718xx_irq_chip, &bd718xx->irq_data);
+	ret = devm_regmap_add_irq_chip(&i2c->dev, regmap, i2c->irq,
+				       IRQF_ONESHOT, 0, &bd718xx_irq_chip,
+				       &irq_data);
 	if (ret) {
 		dev_err(&i2c->dev, "Failed to add irq_chip\n");
 		return ret;
 	}
 
-	ret = bd718xx_init_press_duration(bd718xx);
+	ret = bd718xx_init_press_duration(regmap, &i2c->dev);
 	if (ret)
 		return ret;
 
-	ret = regmap_irq_get_virq(bd718xx->irq_data, BD718XX_INT_PWRBTN_S);
+	ret = regmap_irq_get_virq(irq_data, BD718XX_INT_PWRBTN_S);
 
 	if (ret < 0) {
 		dev_err(&i2c->dev, "Failed to get the IRQ\n");
···
 
 	button.irq = ret;
 
-	ret = devm_mfd_add_devices(bd718xx->chip.dev, PLATFORM_DEVID_AUTO,
+	ret = devm_mfd_add_devices(&i2c->dev, PLATFORM_DEVID_AUTO,
 				   mfd, cells, NULL, 0,
-				   regmap_irq_get_domain(bd718xx->irq_data));
+				   regmap_irq_get_domain(irq_data));
 	if (ret)
 		dev_err(&i2c->dev, "Failed to create subdevices\n");
 

include/linux/mfd/rohm-bd718x7.h

···
 	BD718XX_PWRBTN_LONG_PRESS_15S
 };
 
-struct bd718xx {
-	/*
-	 * Please keep this as the first member here as some
-	 * drivers (clk) supporting more than one chip may only know this
-	 * generic struct 'struct rohm_regmap_dev' and assume it is
-	 * the first chunk of parent device's private data.
-	 */
-	struct rohm_regmap_dev chip;
-
-	int chip_irq;
-	struct regmap_irq_chip_data *irq_data;
-};
-
 #endif /* __LINUX_MFD_BD718XX_H__ */