iio: imx7d_adc: Introduce a definition for the input clock

Since the input clock is always 24MHz, there is no need for storing
this value into a variable.

Use a definition instead, which is more appropriate in this case.

Signed-off-by: Fabio Estevam <festevam@gmail.com>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

diff --git a/drivers/iio/adc/imx7d_adc.c b/drivers/iio/adc/imx7d_adc.c
index 3327994..d778407 100644 (file)
--- a/drivers/iio/adc/imx7d_adc.c
+++ b/drivers/iio/adc/imx7d_adc.c
@@ -82,6 +82,7 @@
 #define IMX7D_REG_ADC_INT_STATUS_CHANNEL_CONV_TIME_OUT         0xf0000
 
 #define IMX7D_ADC_TIMEOUT              msecs_to_jiffies(100)
+#define IMX7D_ADC_INPUT_CLK            24000000
 
 enum imx7d_adc_clk_pre_div {
        IMX7D_ADC_ANALOG_CLK_PRE_DIV_4,
@@ -276,13 +277,11 @@ static void imx7d_adc_channel_set(struct imx7d_adc *info)
 
 static u32 imx7d_adc_get_sample_rate(struct imx7d_adc *info)
 {
-       /* input clock is always 24MHz */
-       u32 input_clk = 24000000;
        u32 analogue_core_clk;
        u32 core_time_unit = info->adc_feature.core_time_unit;
        u32 tmp;
 
-       analogue_core_clk = input_clk / info->pre_div_num;
+       analogue_core_clk = IMX7D_ADC_INPUT_CLK / info->pre_div_num;
        tmp = (core_time_unit + 1) * 6;
 
        return analogue_core_clk / tmp;