iio: adc: ltc2387: Properly initialize all members of struct pwm_state vars

When just some members of a struct get assigned a value the remaining
members have no defined value. In this case this affects .polarity and
.usage_power.

Fix that by using an idiom that initializes all unmentioned struct
members to their default value.

Fixes: 4eabb45 ("drivers: iio: adc: Add support for LTC2387")
Signed-off-by: Uwe Kleine-König <u.kleine-koenig@baylibre.com>

Author: ukleinek

drivers/iio/adc/ltc2387.c

@@ -152,11 +152,14 @@ static int ltc2387_set_sampling_freq(struct ltc2387_dev *ltc, int freq)
 	target = DIV_ROUND_CLOSEST_ULL(ltc->ref_clk_rate, freq);
 	ref_clk_period_ps = DIV_ROUND_CLOSEST_ULL(1000000000000ULL,
 						  ltc->ref_clk_rate);
-	cnv_state.period = ref_clk_period_ps * target;
-	cnv_state.duty_cycle = ref_clk_period_ps;
-	cnv_state.phase = 0;
-	cnv_state.time_unit = PWM_UNIT_PSEC;
-	cnv_state.enabled = true;
+
+	cnv_state = (struct pwm_state) {
+		.period = ref_clk_period_ps * target,
+		.duty_cycle = ref_clk_period_ps,
+		.time_unit = PWM_UNIT_PSEC,
+		.enabled = true,
+	};
+
 	ret = pwm_apply_state(ltc->cnv, &cnv_state);
 	if (ret < 0)
 		return ret;
@@ -166,11 +169,15 @@ static int ltc2387_set_sampling_freq(struct ltc2387_dev *ltc, int freq)
 		clk_en_time = DIV_ROUND_UP_ULL(ltc->device_info->resolution, 4);
 	else
 		clk_en_time = DIV_ROUND_UP_ULL(ltc->device_info->resolution, 2);
-	clk_en_state.period = cnv_state.period;
-	clk_en_state.duty_cycle = ref_clk_period_ps * clk_en_time;
-	clk_en_state.phase = cnv_state.phase + LTC2387_T_FIRSTCLK;
-	clk_en_state.time_unit = PWM_UNIT_PSEC;
-	clk_en_state.enabled = true;
+
+	clk_en_state = (struct pwm_state) {
+		.period = cnv_state.period,
+		.duty_cycle = ref_clk_period_ps * clk_en_time,
+		.phase = cnv_state.phase + LTC2387_T_FIRSTCLK,
+		.time_unit = PWM_UNIT_PSEC,
+		.enabled = true,
+	};
+
 	ret = pwm_apply_state(ltc->clk_en, &clk_en_state);
 	if (ret < 0)
 		return ret;