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Date:   Wed, 16 Dec 2020 16:37:54 +0900
From:   Yoshihiro Shimoda <yoshihiro.shimoda.uh@...esas.com>
To:     marek.vasut+renesas@...il.com, lee.jones@...aro.org,
        matti.vaittinen@...rohmeurope.com, lgirdwood@...il.com,
        broonie@...nel.org, linus.walleij@...aro.org,
        bgolaszewski@...libre.com
Cc:     khiem.nguyen.xt@...esas.com, linux-power@...rohmeurope.com,
        linux-gpio@...r.kernel.org, linux-renesas-soc@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Yoshihiro Shimoda <yoshihiro.shimoda.uh@...esas.com>
Subject: [PATCH v3 11/12] mfd: bd9571mwv: Make the driver more generic

From: Khiem Nguyen <khiem.nguyen.xt@...esas.com>

Since the driver supports BD9571MWV PMIC only,
this patch makes the functions and data structure become more generic
so that it can support other PMIC variants as well.

Signed-off-by: Khiem Nguyen <khiem.nguyen.xt@...esas.com>
[shimoda: rebase and refactor]
Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@...esas.com>
---
 drivers/mfd/bd9571mwv.c       | 95 +++++++++++++++++++++++++++----------------
 include/linux/mfd/bd9571mwv.h | 18 ++------
 2 files changed, 63 insertions(+), 50 deletions(-)

diff --git a/drivers/mfd/bd9571mwv.c b/drivers/mfd/bd9571mwv.c
index 49e968e..ccf1a60 100644
--- a/drivers/mfd/bd9571mwv.c
+++ b/drivers/mfd/bd9571mwv.c
@@ -3,6 +3,7 @@
  * ROHM BD9571MWV-M MFD driver
  *
  * Copyright (C) 2017 Marek Vasut <marek.vasut+renesas@...il.com>
+ * Copyright (C) 2020 Renesas Electronics Corporation
  *
  * Based on the TPS65086 driver
  */
@@ -14,6 +15,19 @@
 
 #include <linux/mfd/bd9571mwv.h>
 
+/**
+ * struct bd957x_data - internal data for the bd957x driver
+ *
+ * Internal data to distinguish bd957x variants
+ */
+struct bd957x_data {
+	char *part_name;
+	const struct regmap_config *regmap_config;
+	const struct regmap_irq_chip *irq_chip;
+	const struct mfd_cell *cells;
+	int num_cells;
+};
+
 static const struct mfd_cell bd9571mwv_cells[] = {
 	{ .name = "bd9571mwv-regulator", },
 	{ .name = "bd9571mwv-gpio", },
@@ -102,13 +116,21 @@ static struct regmap_irq_chip bd9571mwv_irq_chip = {
 	.num_irqs	= ARRAY_SIZE(bd9571mwv_irqs),
 };
 
-static int bd9571mwv_identify(struct bd9571mwv *bd)
+static const struct bd957x_data bd9571mwv_data = {
+	.part_name = BD9571MWV_PART_NAME,
+	.regmap_config = &bd9571mwv_regmap_config,
+	.irq_chip = &bd9571mwv_irq_chip,
+	.cells = bd9571mwv_cells,
+	.num_cells = ARRAY_SIZE(bd9571mwv_cells),
+};
+
+static int bd9571mwv_identify(struct device *dev, struct regmap *regmap,
+			      const char *part_name)
 {
-	struct device *dev = bd->dev;
 	unsigned int value;
 	int ret;
 
-	ret = regmap_read(bd->regmap, BD9571MWV_VENDOR_CODE, &value);
+	ret = regmap_read(regmap, BD9571MWV_VENDOR_CODE, &value);
 	if (ret) {
 		dev_err(dev, "Failed to read vendor code register (ret=%i)\n",
 			ret);
@@ -121,27 +143,20 @@ static int bd9571mwv_identify(struct bd9571mwv *bd)
 		return -EINVAL;
 	}
 
-	ret = regmap_read(bd->regmap, BD9571MWV_PRODUCT_CODE, &value);
+	ret = regmap_read(regmap, BD9571MWV_PRODUCT_CODE, &value);
 	if (ret) {
 		dev_err(dev, "Failed to read product code register (ret=%i)\n",
 			ret);
 		return ret;
 	}
-
-	if (value != BD9571MWV_PRODUCT_CODE_VAL) {
-		dev_err(dev, "Invalid product code ID %02x (expected %02x)\n",
-			value, BD9571MWV_PRODUCT_CODE_VAL);
-		return -EINVAL;
-	}
-
-	ret = regmap_read(bd->regmap, BD9571MWV_PRODUCT_REVISION, &value);
+	ret = regmap_read(regmap, BD9571MWV_PRODUCT_REVISION, &value);
 	if (ret) {
 		dev_err(dev, "Failed to read revision register (ret=%i)\n",
 			ret);
 		return ret;
 	}
 
-	dev_info(dev, "Device: BD9571MWV rev. %d\n", value & 0xff);
+	dev_info(dev, "Device: %s rev. %d\n", part_name, value & 0xff);
 
 	return 0;
 }
@@ -149,38 +164,48 @@ static int bd9571mwv_identify(struct bd9571mwv *bd)
 static int bd9571mwv_probe(struct i2c_client *client,
 			  const struct i2c_device_id *ids)
 {
-	struct bd9571mwv *bd;
-	int ret;
-
-	bd = devm_kzalloc(&client->dev, sizeof(*bd), GFP_KERNEL);
-	if (!bd)
-		return -ENOMEM;
-
-	i2c_set_clientdata(client, bd);
-	bd->dev = &client->dev;
-	bd->irq = client->irq;
+	const struct bd957x_data *data;
+	struct device *dev = &client->dev;
+	struct regmap *regmap;
+	struct regmap_irq_chip_data *irq_data;
+	int ret, irq = client->irq;
+
+	/* Read the PMIC product code */
+	ret = i2c_smbus_read_byte_data(client, BD9571MWV_PRODUCT_CODE);
+	if (ret < 0) {
+		dev_err(dev, "failed reading at 0x%02x\n",
+			BD9571MWV_PRODUCT_CODE);
+		return ret;
+	}
+	switch (ret) {
+	case BD9571MWV_PRODUCT_CODE_VAL:
+		data = &bd9571mwv_data;
+		break;
+	default:
+		dev_err(dev, "Unsupported device 0x%x\n", ret);
+		return -ENOENT;
+	}
 
-	bd->regmap = devm_regmap_init_i2c(client, &bd9571mwv_regmap_config);
-	if (IS_ERR(bd->regmap)) {
-		dev_err(bd->dev, "Failed to initialize register map\n");
-		return PTR_ERR(bd->regmap);
+	regmap = devm_regmap_init_i2c(client, data->regmap_config);
+	if (IS_ERR(regmap)) {
+		dev_err(dev, "Failed to initialize register map\n");
+		return PTR_ERR(regmap);
 	}
 
-	ret = bd9571mwv_identify(bd);
+	ret = bd9571mwv_identify(dev, regmap, data->part_name);
 	if (ret)
 		return ret;
 
-	ret = devm_regmap_add_irq_chip(bd->dev, bd->regmap, bd->irq,
-				       IRQF_ONESHOT, 0, &bd9571mwv_irq_chip,
-				       &bd->irq_data);
+	ret = devm_regmap_add_irq_chip(dev, regmap, irq, IRQF_ONESHOT, 0,
+				       data->irq_chip, &irq_data);
 	if (ret) {
-		dev_err(bd->dev, "Failed to register IRQ chip\n");
+		dev_err(dev, "Failed to register IRQ chip\n");
 		return ret;
 	}
 
-	return devm_mfd_add_devices(bd->dev, PLATFORM_DEVID_AUTO,
-				    bd9571mwv_cells, ARRAY_SIZE(bd9571mwv_cells),
-				    NULL, 0, regmap_irq_get_domain(bd->irq_data));
+	return devm_mfd_add_devices(dev, PLATFORM_DEVID_AUTO, data->cells,
+				    data->num_cells, NULL, 0,
+				    regmap_irq_get_domain(irq_data));
 }
 
 static const struct of_device_id bd9571mwv_of_match_table[] = {
diff --git a/include/linux/mfd/bd9571mwv.h b/include/linux/mfd/bd9571mwv.h
index bcc7092..5ab976a 100644
--- a/include/linux/mfd/bd9571mwv.h
+++ b/include/linux/mfd/bd9571mwv.h
@@ -3,6 +3,7 @@
  * ROHM BD9571MWV-M driver
  *
  * Copyright (C) 2017 Marek Vasut <marek.vasut+renesas@...il.com>
+ * Copyright (C) 2020 Renesas Electronics Corporation
  *
  * Based on the TPS65086 driver
  */
@@ -83,6 +84,8 @@
 
 #define BD9571MWV_ACCESS_KEY			0xff
 
+#define BD9571MWV_PART_NAME			"BD9571MWV"
+
 /* Define the BD9571MWV IRQ numbers */
 enum bd9571mwv_irqs {
 	BD9571MWV_IRQ_MD1,
@@ -94,19 +97,4 @@ enum bd9571mwv_irqs {
 	BD9571MWV_IRQ_WDT_OF,
 	BD9571MWV_IRQ_BKUP_TRG,
 };
-
-/**
- * struct bd9571mwv - state holder for the bd9571mwv driver
- *
- * Device data may be used to access the BD9571MWV chip
- */
-struct bd9571mwv {
-	struct device *dev;
-	struct regmap *regmap;
-
-	/* IRQ Data */
-	int irq;
-	struct regmap_irq_chip_data *irq_data;
-};
-
 #endif /* __LINUX_MFD_BD9571MWV_H */
-- 
2.7.4

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