linux-kernel - [PATCH v4 8/9] mfd: mt6360: Fix flow which is used to check ic exist

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Date:   Mon, 17 Aug 2020 18:47:56 +0800
From:   Gene Chen <gene.chen.richtek@...il.com>
To:     lee.jones@...aro.org, matthias.bgg@...il.com
Cc:     linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org, linux-kernel@...r.kernel.org,
        gene_chen@...htek.com, benjamin.chao@...iatek.com,
        shufan_lee@...htek.com, cy_huang@...htek.com
Subject: [PATCH v4 8/9] mfd: mt6360: Fix flow which is used to check ic exist

From: Gene Chen <gene_chen@...htek.com>

Fix flow which is used to check ic exist.

Signed-off-by: Gene Chen <gene_chen@...htek.com>
---
 drivers/mfd/mt6360-core.c | 32 +++++++++++++++++++++-----------
 1 file changed, 21 insertions(+), 11 deletions(-)

diff --git a/drivers/mfd/mt6360-core.c b/drivers/mfd/mt6360-core.c
index 2356d99..677c974 100644
--- a/drivers/mfd/mt6360-core.c
+++ b/drivers/mfd/mt6360-core.c
@@ -293,6 +293,25 @@ static const struct mfd_cell mt6360_devs[] = {
 		    NULL, 0, 0, "mediatek,mt6360-tcpc"),
 };
 
+static int mt6360_check_vendor_info(struct mt6360_ddata *ddata)
+{
+	u32 info;
+	int ret;
+
+	ret = regmap_read(ddata->regmap, MT6360_PMU_DEV_INFO, &info);
+	if (ret < 0)
+		return ret;
+
+	if ((info & CHIP_VEN_MASK) != CHIP_VEN_MT6360) {
+		dev_err(&client->dev, "Device not supported\n");
+		return -ENODEV;
+	}
+
+	ddata->chip_rev = info & CHIP_REV_MASK;
+
+	return 0;
+}
+
 static const unsigned short mt6360_slave_addr[MT6360_SLAVE_MAX] = {
 	MT6360_PMU_SLAVEID,
 	MT6360_PMIC_SLAVEID,
@@ -303,7 +322,6 @@ static const unsigned short mt6360_slave_addr[MT6360_SLAVE_MAX] = {
 static int mt6360_probe(struct i2c_client *client)
 {
 	struct mt6360_ddata *ddata;
-	unsigned int reg_data;
 	int i, ret;
 
 	ddata = devm_kzalloc(&client->dev, sizeof(*ddata), GFP_KERNEL);
@@ -319,17 +337,9 @@ static int mt6360_probe(struct i2c_client *client)
 		return PTR_ERR(ddata->regmap);
 	}
 
-	ret = regmap_read(ddata->regmap, MT6360_PMU_DEV_INFO, &reg_data);
-	if (ret) {
-		dev_err(&client->dev, "Device not found\n");
+	ret = mt6360_check_vendor_info(ddata);
+	if (ret)
 		return ret;
-	}
-
-	ddata->chip_rev = reg_data & CHIP_REV_MASK;
-	if (ddata->chip_rev != CHIP_VEN_MT6360) {
-		dev_err(&client->dev, "Device not supported\n");
-		return -ENODEV;
-	}
 
 	ret = devm_regmap_add_irq_chip(&client->dev, ddata->regmap, client->irq,
 				       0, 0, &mt6360_irq_chip,
-- 
2.7.4