iio: adc: aspeed: Use model_data to set clk scaler.

This patch uses need_prescaler and scaler_bit_width to set the ADC clock
scaler.

Reported-by: kernel test robot <lkp@intel.com>
Signed-off-by: Billy Tsai <billy_tsai@aspeedtech.com>
Link: https://lore.kernel.org/r/20210922081520.30580-5-billy_tsai@aspeedtech.com
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

drivers/iio/adc/aspeed_adc.c

@@ -210,9 +210,10 @@ static int aspeed_adc_probe(struct platform_device *pdev)
 {
 	struct iio_dev *indio_dev;
 	struct aspeed_adc_data *data;
-	const char *clk_parent_name;
 	int ret;
 	u32 adc_engine_control_reg_val;
+	unsigned long scaler_flags = 0;
+	char clk_name[32], clk_parent_name[32];
 
 	indio_dev = devm_iio_device_alloc(&pdev->dev, sizeof(*data));
 	if (!indio_dev)
@@ -228,24 +229,32 @@ static int aspeed_adc_probe(struct platform_device *pdev)
 
 	/* Register ADC clock prescaler with source specified by device tree. */
 	spin_lock_init(&data->clk_lock);
-	clk_parent_name = of_clk_get_parent_name(pdev->dev.of_node, 0);
-
-	data->clk_prescaler = clk_hw_register_divider(
-				&pdev->dev, "prescaler", clk_parent_name, 0,
-				data->base + ASPEED_REG_CLOCK_CONTROL,
-				17, 15, 0, &data->clk_lock);
-	if (IS_ERR(data->clk_prescaler))
-		return PTR_ERR(data->clk_prescaler);
-
+	snprintf(clk_parent_name, ARRAY_SIZE(clk_parent_name), "%s",
+		 of_clk_get_parent_name(pdev->dev.of_node, 0));
+
+	if (data->model_data->need_prescaler) {
+		snprintf(clk_name, ARRAY_SIZE(clk_name), "%s-prescaler",
+			 data->model_data->model_name);
+		data->clk_prescaler = clk_hw_register_divider(
+			&pdev->dev, clk_name, clk_parent_name, 0,
+			data->base + ASPEED_REG_CLOCK_CONTROL, 17, 15, 0,
+			&data->clk_lock);
+		if (IS_ERR(data->clk_prescaler))
+			return PTR_ERR(data->clk_prescaler);
+		snprintf(clk_parent_name, ARRAY_SIZE(clk_parent_name),
+			 clk_name);
+		scaler_flags = CLK_SET_RATE_PARENT;
+	}
 	/*
 	 * Register ADC clock scaler downstream from the prescaler. Allow rate
 	 * setting to adjust the prescaler as well.
 	 */
+	snprintf(clk_name, ARRAY_SIZE(clk_name), "%s-scaler",
+		 data->model_data->model_name);
 	data->clk_scaler = clk_hw_register_divider(
-				&pdev->dev, "scaler", "prescaler",
-				CLK_SET_RATE_PARENT,
-				data->base + ASPEED_REG_CLOCK_CONTROL,
-				0, 10, 0, &data->clk_lock);
+		&pdev->dev, clk_name, clk_parent_name, scaler_flags,
+		data->base + ASPEED_REG_CLOCK_CONTROL, 0,
+		data->model_data->scaler_bit_width, 0, &data->clk_lock);
 	if (IS_ERR(data->clk_scaler)) {
 		ret = PTR_ERR(data->clk_scaler);
 		goto scaler_error;
@@ -317,7 +326,8 @@ static int aspeed_adc_probe(struct platform_device *pdev)
 reset_error:
 	clk_hw_unregister_divider(data->clk_scaler);
 scaler_error:
-	clk_hw_unregister_divider(data->clk_prescaler);
+	if (data->model_data->need_prescaler)
+		clk_hw_unregister_divider(data->clk_prescaler);
 	return ret;
 }
 
@@ -332,7 +342,8 @@ static int aspeed_adc_remove(struct platform_device *pdev)
 	clk_disable_unprepare(data->clk_scaler->clk);
 	reset_control_assert(data->rst);
 	clk_hw_unregister_divider(data->clk_scaler);
-	clk_hw_unregister_divider(data->clk_prescaler);
+	if (data->model_data->need_prescaler)
+		clk_hw_unregister_divider(data->clk_prescaler);
 
 	return 0;
 }