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iio: imx7d_adc: Introduce a definition for the input clock

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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>
This commit is contained in:
Fabio Estevam 2019-06-03 16:34:31 -03:00 committed by Jonathan Cameron
parent fe93116459
commit 9ce92da84f
1 changed files with 2 additions and 3 deletions
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5
drivers/iio/adc/imx7d_adc.c
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@ -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;