[PATCH v7 4/6] iio: adc: meson: add enum for iio channel numbers

[George Stark]

Channels could be referenced in the driver code and using enum allows
to make it more robust.

Signed-off-by: George Stark <GNStark at sberdevices.ru>
Reviewed-by: Andy Shevchenko <andriy.shevchenko at linux.intel.com>
---
 drivers/iio/adc/meson_saradc.c | 46 +++++++++++++++++++++-------------
 1 file changed, 29 insertions(+), 17 deletions(-)

diff --git a/drivers/iio/adc/meson_saradc.c b/drivers/iio/adc/meson_saradc.c
index 44ac6ce5e3aa..b14c66656bcc 100644
--- a/drivers/iio/adc/meson_saradc.c
+++ b/drivers/iio/adc/meson_saradc.c
@@ -224,27 +224,39 @@ enum meson_sar_adc_chan7_mux_sel {
 	CHAN7_MUX_CH7_INPUT = 0x7,
 };
 
+enum meson_sar_adc_channel_index {
+	NUM_CHAN_0,
+	NUM_CHAN_1,
+	NUM_CHAN_2,
+	NUM_CHAN_3,
+	NUM_CHAN_4,
+	NUM_CHAN_5,
+	NUM_CHAN_6,
+	NUM_CHAN_7,
+	NUM_CHAN_TEMP,
+};
+
 static const struct iio_chan_spec meson_sar_adc_iio_channels[] = {
-	MESON_SAR_ADC_CHAN(0),
-	MESON_SAR_ADC_CHAN(1),
-	MESON_SAR_ADC_CHAN(2),
-	MESON_SAR_ADC_CHAN(3),
-	MESON_SAR_ADC_CHAN(4),
-	MESON_SAR_ADC_CHAN(5),
-	MESON_SAR_ADC_CHAN(6),
-	MESON_SAR_ADC_CHAN(7),
+	MESON_SAR_ADC_CHAN(NUM_CHAN_0),
+	MESON_SAR_ADC_CHAN(NUM_CHAN_1),
+	MESON_SAR_ADC_CHAN(NUM_CHAN_2),
+	MESON_SAR_ADC_CHAN(NUM_CHAN_3),
+	MESON_SAR_ADC_CHAN(NUM_CHAN_4),
+	MESON_SAR_ADC_CHAN(NUM_CHAN_5),
+	MESON_SAR_ADC_CHAN(NUM_CHAN_6),
+	MESON_SAR_ADC_CHAN(NUM_CHAN_7),
 };
 
 static const struct iio_chan_spec meson_sar_adc_and_temp_iio_channels[] = {
-	MESON_SAR_ADC_CHAN(0),
-	MESON_SAR_ADC_CHAN(1),
-	MESON_SAR_ADC_CHAN(2),
-	MESON_SAR_ADC_CHAN(3),
-	MESON_SAR_ADC_CHAN(4),
-	MESON_SAR_ADC_CHAN(5),
-	MESON_SAR_ADC_CHAN(6),
-	MESON_SAR_ADC_CHAN(7),
-	MESON_SAR_ADC_TEMP_CHAN(8),
+	MESON_SAR_ADC_CHAN(NUM_CHAN_0),
+	MESON_SAR_ADC_CHAN(NUM_CHAN_1),
+	MESON_SAR_ADC_CHAN(NUM_CHAN_2),
+	MESON_SAR_ADC_CHAN(NUM_CHAN_3),
+	MESON_SAR_ADC_CHAN(NUM_CHAN_4),
+	MESON_SAR_ADC_CHAN(NUM_CHAN_5),
+	MESON_SAR_ADC_CHAN(NUM_CHAN_6),
+	MESON_SAR_ADC_CHAN(NUM_CHAN_7),
+	MESON_SAR_ADC_TEMP_CHAN(NUM_CHAN_TEMP),
 };
 
 struct meson_sar_adc_param {
-- 
2.38.4