hwmon: (ntc_thermistor) sort thermistor id lists alphabetically

Use an enum to index the array, so that it is possible to add sorted
entries without causing churn.
Signed-off-by: Peter Rosin <peda@axentia.se>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>

drivers/hwmon/ntc_thermistor.c

@@ -45,18 +45,34 @@ struct ntc_compensation {
 	unsigned int	ohm;
 };
 
-/* Order matters, ntc_match references the entries by index */
+/*
+ * Used as index in a zero-terminated array, holes not allowed so
+ * that NTC_LAST is the first empty array entry.
+ */
+enum {
+	NTC_B57330V2103,
+	NTC_B57891S0103,
+	NTC_NCP03WB473,
+	NTC_NCP03WF104,
+	NTC_NCP15WB473,
+	NTC_NCP15WL333,
+	NTC_NCP15XH103,
+	NTC_NCP18WB473,
+	NTC_NCP21WB473,
+	NTC_LAST,
+};
+
 static const struct platform_device_id ntc_thermistor_id[] = {
-	{ "ncp15wb473", TYPE_NCPXXWB473 },
-	{ "ncp18wb473", TYPE_NCPXXWB473 },
-	{ "ncp21wb473", TYPE_NCPXXWB473 },
-	{ "ncp03wb473", TYPE_NCPXXWB473 },
-	{ "ncp15wl333", TYPE_NCPXXWL333 },
-	{ "b57330v2103", TYPE_B57330V2103},
-	{ "ncp03wf104", TYPE_NCPXXWF104 },
-	{ "ncp15xh103", TYPE_NCPXXXH103 },
-	{ "b57891s0103", TYPE_B57891S0103 },
-	{ },
+	[NTC_B57330V2103]     = { "b57330v2103",     TYPE_B57330V2103 },
+	[NTC_B57891S0103]     = { "b57891s0103",     TYPE_B57891S0103 },
+	[NTC_NCP03WB473]      = { "ncp03wb473",      TYPE_NCPXXWB473 },
+	[NTC_NCP03WF104]      = { "ncp03wf104",      TYPE_NCPXXWF104 },
+	[NTC_NCP15WB473]      = { "ncp15wb473",      TYPE_NCPXXWB473 },
+	[NTC_NCP15WL333]      = { "ncp15wl333",      TYPE_NCPXXWL333 },
+	[NTC_NCP15XH103]      = { "ncp15xh103",      TYPE_NCPXXXH103 },
+	[NTC_NCP18WB473]      = { "ncp18wb473",      TYPE_NCPXXWB473 },
+	[NTC_NCP21WB473]      = { "ncp21wb473",      TYPE_NCPXXWB473 },
+	[NTC_LAST]            = { },
 };
 
 /*
@@ -327,36 +343,36 @@ static int ntc_adc_iio_read(struct ntc_thermistor_platform_data *pdata)
 }
 
 static const struct of_device_id ntc_match[] = {
-	{ .compatible = "murata,ncp15wb473",
-		.data = &ntc_thermistor_id[0] },
-	{ .compatible = "murata,ncp18wb473",
-		.data = &ntc_thermistor_id[1] },
-	{ .compatible = "murata,ncp21wb473",
-		.data = &ntc_thermistor_id[2] },
-	{ .compatible = "murata,ncp03wb473",
-		.data = &ntc_thermistor_id[3] },
-	{ .compatible = "murata,ncp15wl333",
-		.data = &ntc_thermistor_id[4] },
 	{ .compatible = "epcos,b57330v2103",
-		.data = &ntc_thermistor_id[5]},
+		.data = &ntc_thermistor_id[NTC_B57330V2103]},
+	{ .compatible = "epcos,b57891s0103",
+		.data = &ntc_thermistor_id[NTC_B57891S0103] },
+	{ .compatible = "murata,ncp03wb473",
+		.data = &ntc_thermistor_id[NTC_NCP03WB473] },
 	{ .compatible = "murata,ncp03wf104",
-		.data = &ntc_thermistor_id[6] },
+		.data = &ntc_thermistor_id[NTC_NCP03WF104] },
+	{ .compatible = "murata,ncp15wb473",
+		.data = &ntc_thermistor_id[NTC_NCP15WB473] },
+	{ .compatible = "murata,ncp15wl333",
+		.data = &ntc_thermistor_id[NTC_NCP15WL333] },
 	{ .compatible = "murata,ncp15xh103",
-		.data = &ntc_thermistor_id[7] },
-	{ .compatible = "epcos,b57891s0103",
-		.data = &ntc_thermistor_id[8] },
+		.data = &ntc_thermistor_id[NTC_NCP15XH103] },
+	{ .compatible = "murata,ncp18wb473",
+		.data = &ntc_thermistor_id[NTC_NCP18WB473] },
+	{ .compatible = "murata,ncp21wb473",
+		.data = &ntc_thermistor_id[NTC_NCP21WB473] },
 
 	/* Usage of vendor name "ntc" is deprecated */
+	{ .compatible = "ntc,ncp03wb473",
+		.data = &ntc_thermistor_id[NTC_NCP03WB473] },
 	{ .compatible = "ntc,ncp15wb473",
-		.data = &ntc_thermistor_id[0] },
+		.data = &ntc_thermistor_id[NTC_NCP15WB473] },
+	{ .compatible = "ntc,ncp15wl333",
+		.data = &ntc_thermistor_id[NTC_NCP15WL333] },
 	{ .compatible = "ntc,ncp18wb473",
-		.data = &ntc_thermistor_id[1] },
+		.data = &ntc_thermistor_id[NTC_NCP18WB473] },
 	{ .compatible = "ntc,ncp21wb473",
-		.data = &ntc_thermistor_id[2] },
-	{ .compatible = "ntc,ncp03wb473",
-		.data = &ntc_thermistor_id[3] },
-	{ .compatible = "ntc,ncp15wl333",
-		.data = &ntc_thermistor_id[4] },
+		.data = &ntc_thermistor_id[NTC_NCP21WB473] },
 	{ },
 };
 MODULE_DEVICE_TABLE(of, ntc_match);