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From:   Gene Chen <gene.chen.richtek@gmail.com>
To:     lee.jones@linaro.org, matthias.bgg@gmail.com
Cc:     linux-arm-kernel@lists.infradead.org,
        linux-mediatek@lists.infradead.org, linux-kernel@vger.kernel.org,
        gene_chen@richtek.com, shufan_lee@richtek.com,
        cy_huang@richtek.com, benjamin.chao@mediatek.com
Subject: [PATCH 3/4] mfd: mt6360: Fix flow which is used to check ic exist
Date:   Tue,  7 Jul 2020 18:30:55 +0800
Message-Id: <1594117856-14343-4-git-send-email-gene.chen.richtek@gmail.com>
In-Reply-To: <1594117856-14343-1-git-send-email-gene.chen.richtek@gmail.com>
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Sender: linux-kernel-owner@vger.kernel.org
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From: Gene Chen <gene_chen@richtek.com>

Fix flow which is used to check ic exist

Signed-off-by: Gene Chen <gene_chen@richtek.com>
---
 drivers/mfd/mt6360-core.c  | 28 +++++++++++++++++++---------
 include/linux/mfd/mt6360.h |  8 ++++----
 2 files changed, 23 insertions(+), 13 deletions(-)

diff --git a/drivers/mfd/mt6360-core.c b/drivers/mfd/mt6360-core.c
index 2dd5918..4bb2949 100644
--- a/drivers/mfd/mt6360-core.c
+++ b/drivers/mfd/mt6360-core.c
@@ -293,6 +293,23 @@ static const struct mfd_cell mt6360_devs[] = {
 		    NULL, 0, 0, "mediatek,mt6360-tcpc"),
 };
 
+static int mt6360_check_vendor_info(struct mt6360_data *data)
+{
+	u32 info;
+	int ret;
+
+	ret = regmap_read(data->regmap, MT6360_REG_PMU_DEVINFO, &info);
+	if (ret < 0)
+		return ret;
+
+	if ((info & MT6360_CHIPVEN_MASK) != MT6360_CHIPVEN_VAL)
+		return -ENODEV;
+
+	data->chip_rev = info & MT6360_CHIPREV_MASK;
+
+	return 0;
+}
+
 static const unsigned short mt6360_slave_addr[MT6360_SLAVE_MAX] = {
 	MT6360_PMU_SLAVEID,
 	MT6360_PMIC_SLAVEID,
@@ -303,7 +320,6 @@ static const unsigned short mt6360_slave_addr[MT6360_SLAVE_MAX] = {
 static int mt6360_probe(struct i2c_client *client)
 {
 	struct mt6360_data *data;
-	unsigned int reg_data;
 	int i, ret;
 
 	data = devm_kzalloc(&client->dev, sizeof(*data), GFP_KERNEL);
@@ -319,16 +335,10 @@ static int mt6360_probe(struct i2c_client *client)
 		return PTR_ERR(data->regmap);
 	}
 
-	ret = regmap_read(data->regmap, MT6360_PMU_DEV_INFO, &reg_data);
+	ret = mt6360_check_vendor_info(data);
 	if (ret) {
-		dev_err(&client->dev, "Device not found\n");
-		return ret;
-	}
-
-	data->chip_rev = reg_data & CHIP_REV_MASK;
-	if (data->chip_rev != CHIP_VEN_MT6360) {
 		dev_err(&client->dev, "Device not supported\n");
-		return -ENODEV;
+		return ret;
 	}
 
 	ret = devm_regmap_add_irq_chip(&client->dev, data->regmap, client->irq,
diff --git a/include/linux/mfd/mt6360.h b/include/linux/mfd/mt6360.h
index 9fc6718..5ec0f5d 100644
--- a/include/linux/mfd/mt6360.h
+++ b/include/linux/mfd/mt6360.h
@@ -30,7 +30,7 @@ struct mt6360_data {
 };
 
 /* PMU register defininition */
-#define MT6360_PMU_DEV_INFO			(0x00)
+#define MT6360_REG_PMU_DEVINFO			(0x00)
 #define MT6360_PMU_CORE_CTRL1			(0x01)
 #define MT6360_PMU_RST1				(0x02)
 #define MT6360_PMU_CRCEN			(0x03)
@@ -233,8 +233,8 @@ struct mt6360_data {
 #define MT6360_IRQ_REGNUM	16
 #define MT6360_IRQ_RETRIG	BIT(2)
 
-#define CHIP_VEN_MASK				(0xF0)
-#define CHIP_VEN_MT6360				(0x50)
-#define CHIP_REV_MASK				(0x0F)
+#define MT6360_CHIPVEN_MASK			(0xF0)
+#define MT6360_CHIPVEN_VAL			(0x50)
+#define MT6360_CHIPREV_MASK			(0x0F)
 
 #endif /* __MT6360_H__ */
-- 
2.7.4