i2c: wmt: create wmt_i2c_init for general init

Some common initialization actions are put in the function
wmt_i2c_init(), which is convenient to share with zhaoxin.
Reviewed-by: Andi Shyti <andi.shyti@kernel.org>
Reviewed-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Signed-off-by: Hans Hu <hanshu-oc@zhaoxin.com>
Signed-off-by: Andi Shyti <andi.shyti@kernel.org>

drivers/i2c/busses/i2c-wmt.c

@@ -286,6 +286,38 @@ static irqreturn_t wmt_i2c_isr(int irq, void *data)
 	return IRQ_HANDLED;
 }
 
+static int wmt_i2c_init(struct platform_device *pdev, struct wmt_i2c_dev **pi2c_dev)
+{
+	int err;
+	struct wmt_i2c_dev *i2c_dev;
+	struct device_node *np = pdev->dev.of_node;
+
+	i2c_dev = devm_kzalloc(&pdev->dev, sizeof(*i2c_dev), GFP_KERNEL);
+	if (!i2c_dev)
+		return -ENOMEM;
+
+	i2c_dev->base = devm_platform_get_and_ioremap_resource(pdev, 0, NULL);
+	if (IS_ERR(i2c_dev->base))
+		return PTR_ERR(i2c_dev->base);
+
+	i2c_dev->irq = irq_of_parse_and_map(np, 0);
+	if (!i2c_dev->irq)
+		return -EINVAL;
+
+	err = devm_request_irq(&pdev->dev, i2c_dev->irq, wmt_i2c_isr,
+			       0, pdev->name, i2c_dev);
+	if (err)
+		return dev_err_probe(&pdev->dev, err,
+				"failed to request irq %i\n", i2c_dev->irq);
+
+	i2c_dev->dev = &pdev->dev;
+	init_completion(&i2c_dev->complete);
+	platform_set_drvdata(pdev, i2c_dev);
+
+	*pi2c_dev = i2c_dev;
+	return 0;
+}
+
 static int wmt_i2c_reset_hardware(struct wmt_i2c_dev *i2c_dev)
 {
 	int err;
@@ -327,19 +359,9 @@ static int wmt_i2c_probe(struct platform_device *pdev)
 	int err;
 	u32 clk_rate;
 
-	i2c_dev = devm_kzalloc(&pdev->dev, sizeof(*i2c_dev), GFP_KERNEL);
-	if (!i2c_dev)
-		return -ENOMEM;
-
-	i2c_dev->base = devm_platform_get_and_ioremap_resource(pdev, 0, NULL);
-	if (IS_ERR(i2c_dev->base))
-		return PTR_ERR(i2c_dev->base);
-
-	i2c_dev->irq = irq_of_parse_and_map(np, 0);
-	if (!i2c_dev->irq) {
-		dev_err(&pdev->dev, "irq missing or invalid\n");
-		return -EINVAL;
-	}
+	err = wmt_i2c_init(pdev, &i2c_dev);
+	if (err)
+		return err;
 
 	i2c_dev->clk = of_clk_get(np, 0);
 	if (IS_ERR(i2c_dev->clk)) {
@@ -348,18 +370,9 @@ static int wmt_i2c_probe(struct platform_device *pdev)
 	}
 
 	err = of_property_read_u32(np, "clock-frequency", &clk_rate);
-	if (!err && (clk_rate == I2C_MAX_FAST_MODE_FREQ))
+	if (!err && clk_rate == I2C_MAX_FAST_MODE_FREQ)
 		i2c_dev->tcr = TCR_FAST_MODE;
 
-	i2c_dev->dev = &pdev->dev;
-
-	err = devm_request_irq(&pdev->dev, i2c_dev->irq, wmt_i2c_isr, 0,
-							"i2c", i2c_dev);
-	if (err) {
-		dev_err(&pdev->dev, "failed to request irq %i\n", i2c_dev->irq);
-		return err;
-	}
-
 	adap = &i2c_dev->adapter;
 	i2c_set_adapdata(adap, i2c_dev);
 	strscpy(adap->name, "WMT I2C adapter", sizeof(adap->name));
@@ -368,8 +381,6 @@ static int wmt_i2c_probe(struct platform_device *pdev)
 	adap->dev.parent = &pdev->dev;
 	adap->dev.of_node = pdev->dev.of_node;
 
-	init_completion(&i2c_dev->complete);
-
 	err = wmt_i2c_reset_hardware(i2c_dev);
 	if (err) {
 		dev_err(&pdev->dev, "error initializing hardware\n");
@@ -380,8 +391,6 @@ static int wmt_i2c_probe(struct platform_device *pdev)
 	if (err)
 		goto err_disable_clk;
 
-	platform_set_drvdata(pdev, i2c_dev);
-
 	return 0;
 
 err_disable_clk: