iio: adc: max9611: Make enum relations more future proof

The relations between enum values and array indices values are currently
not enforced by the code, which makes them fragile w.r.t. future
changes.

Fix this by:
  1. Using designated array initializers, to make sure array indices and
     enums values match,
  2. Linking max9611_csa_gain enum values to the corresponding
     max9611_conf_ids enum values, as the latter is cast to the former
     in max9611_read_csa_voltage().

No change in generated code.
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Reviewed-by: Niklas Söderlund <niklas.soderlund+renesas@ragnatech.se>
Acked-by: Jacopo Mondi <jacopo@jmondi.org>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

drivers/iio/adc/max9611.c

@@ -109,22 +109,17 @@ enum max9611_conf_ids {
  *		      where data shall be read from
  */
 static const unsigned int max9611_mux_conf[][2] = {
-	/* CONF_SENSE_1x */
-	{ MAX9611_MUX_SENSE_1x, MAX9611_REG_CSA_DATA },
-	/* CONF_SENSE_4x */
-	{ MAX9611_MUX_SENSE_4x, MAX9611_REG_CSA_DATA },
-	/* CONF_SENSE_8x */
-	{ MAX9611_MUX_SENSE_8x, MAX9611_REG_CSA_DATA },
-	/* CONF_IN_VOLT */
-	{ MAX9611_INPUT_VOLT, MAX9611_REG_RS_DATA },
-	/* CONF_TEMP */
-	{ MAX9611_MUX_TEMP, MAX9611_REG_TEMP_DATA },
+	[CONF_SENSE_1x]	= { MAX9611_MUX_SENSE_1x, MAX9611_REG_CSA_DATA },
+	[CONF_SENSE_4x]	= { MAX9611_MUX_SENSE_4x, MAX9611_REG_CSA_DATA },
+	[CONF_SENSE_8x]	= { MAX9611_MUX_SENSE_8x, MAX9611_REG_CSA_DATA },
+	[CONF_IN_VOLT]	= { MAX9611_INPUT_VOLT, MAX9611_REG_RS_DATA },
+	[CONF_TEMP]	= { MAX9611_MUX_TEMP, MAX9611_REG_TEMP_DATA },
 };
 
 enum max9611_csa_gain {
-	CSA_GAIN_1x,
-	CSA_GAIN_4x,
-	CSA_GAIN_8x,
+	CSA_GAIN_1x = CONF_SENSE_1x,
+	CSA_GAIN_4x = CONF_SENSE_4x,
+	CSA_GAIN_8x = CONF_SENSE_8x,
 };
 
 enum max9611_csa_gain_params {
@@ -142,18 +137,9 @@ enum max9611_csa_gain_params {
  * value; use this structure to retrieve the correct LSB and offset values.
  */
 static const unsigned int max9611_gain_conf[][2] = {
-	{ /* [0] CSA_GAIN_1x */
-		MAX9611_CSA_1X_LSB_nV,
-		MAX9611_CSA_1X_OFFS_RAW,
-	},
-	{ /* [1] CSA_GAIN_4x */
-		MAX9611_CSA_4X_LSB_nV,
-		MAX9611_CSA_4X_OFFS_RAW,
-	},
-	{ /* [2] CSA_GAIN_8x */
-		MAX9611_CSA_8X_LSB_nV,
-		MAX9611_CSA_8X_OFFS_RAW,
-	},
+	[CSA_GAIN_1x] = { MAX9611_CSA_1X_LSB_nV, MAX9611_CSA_1X_OFFS_RAW, },
+	[CSA_GAIN_4x] = { MAX9611_CSA_4X_LSB_nV, MAX9611_CSA_4X_OFFS_RAW, },
+	[CSA_GAIN_8x] = { MAX9611_CSA_8X_LSB_nV, MAX9611_CSA_8X_OFFS_RAW, },
 };
 
 enum max9611_chan_addrs {