drivers/thermal/rcar_gen3_thermal: refactor reading fuses into seprarate function

Gen4 will be very different, so refactor Gen3 access into separate call
first.
Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Reviewed-by: Niklas Söderlund <niklas.soderlund+renesas@ragnatech.se>
Reviewed-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
Tested-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
Link: https://lore.kernel.org/r/20230511192220.7523-3-wsa+renesas@sang-engineering.com

drivers/thermal/rcar_gen3_thermal.c

@@ -66,8 +66,11 @@ struct equation_coefs {
 	int b2;
 };
 
+struct rcar_gen3_thermal_priv;
+
 struct rcar_thermal_info {
 	int ths_tj_1;
+	void (*read_fuses)(struct rcar_gen3_thermal_priv *priv);
 };
 
 struct rcar_gen3_thermal_tsc {
@@ -241,6 +244,34 @@ static irqreturn_t rcar_gen3_thermal_irq(int irq, void *data)
 	return IRQ_HANDLED;
 }
 
+static void rcar_gen3_thermal_read_fuses_gen3(struct rcar_gen3_thermal_priv *priv)
+{
+	unsigned int i;
+
+	/*
+	 * Set the pseudo calibration points with fused values.
+	 * PTAT is shared between all TSCs but only fused for the first
+	 * TSC while THCODEs are fused for each TSC.
+	 */
+	priv->ptat[0] = rcar_gen3_thermal_read(priv->tscs[0], REG_GEN3_PTAT1) &
+		GEN3_FUSE_MASK;
+	priv->ptat[1] = rcar_gen3_thermal_read(priv->tscs[0], REG_GEN3_PTAT2) &
+		GEN3_FUSE_MASK;
+	priv->ptat[2] = rcar_gen3_thermal_read(priv->tscs[0], REG_GEN3_PTAT3) &
+		GEN3_FUSE_MASK;
+
+	for (i = 0; i < priv->num_tscs; i++) {
+		struct rcar_gen3_thermal_tsc *tsc = priv->tscs[i];
+
+		tsc->thcode[0] = rcar_gen3_thermal_read(tsc, REG_GEN3_THCODE1) &
+			GEN3_FUSE_MASK;
+		tsc->thcode[1] = rcar_gen3_thermal_read(tsc, REG_GEN3_THCODE2) &
+			GEN3_FUSE_MASK;
+		tsc->thcode[2] = rcar_gen3_thermal_read(tsc, REG_GEN3_THCODE3) &
+			GEN3_FUSE_MASK;
+	}
+}
+
 static bool rcar_gen3_thermal_read_fuses(struct rcar_gen3_thermal_priv *priv)
 {
 	unsigned int i;
@@ -248,7 +279,8 @@ static bool rcar_gen3_thermal_read_fuses(struct rcar_gen3_thermal_priv *priv)
 
 	/* If fuses are not set, fallback to pseudo values. */
 	thscp = rcar_gen3_thermal_read(priv->tscs[0], REG_GEN3_THSCP);
-	if ((thscp & THSCP_COR_PARA_VLD) != THSCP_COR_PARA_VLD) {
+	if (!priv->info->read_fuses ||
+	    (thscp & THSCP_COR_PARA_VLD) != THSCP_COR_PARA_VLD) {
 		/* Default THCODE values in case FUSEs are not set. */
 		static const int thcodes[TSC_MAX_NUM][3] = {
 			{ 3397, 2800, 2221 },
@@ -273,29 +305,7 @@ static bool rcar_gen3_thermal_read_fuses(struct rcar_gen3_thermal_priv *priv)
 		return false;
 	}
 
-	/*
-	 * Set the pseudo calibration points with fused values.
-	 * PTAT is shared between all TSCs but only fused for the first
-	 * TSC while THCODEs are fused for each TSC.
-	 */
-	priv->ptat[0] = rcar_gen3_thermal_read(priv->tscs[0], REG_GEN3_PTAT1) &
-		GEN3_FUSE_MASK;
-	priv->ptat[1] = rcar_gen3_thermal_read(priv->tscs[0], REG_GEN3_PTAT2) &
-		GEN3_FUSE_MASK;
-	priv->ptat[2] = rcar_gen3_thermal_read(priv->tscs[0], REG_GEN3_PTAT3) &
-		GEN3_FUSE_MASK;
-
-	for (i = 0; i < priv->num_tscs; i++) {
-		struct rcar_gen3_thermal_tsc *tsc = priv->tscs[i];
-
-		tsc->thcode[0] = rcar_gen3_thermal_read(tsc, REG_GEN3_THCODE1) &
-			GEN3_FUSE_MASK;
-		tsc->thcode[1] = rcar_gen3_thermal_read(tsc, REG_GEN3_THCODE2) &
-			GEN3_FUSE_MASK;
-		tsc->thcode[2] = rcar_gen3_thermal_read(tsc, REG_GEN3_THCODE3) &
-			GEN3_FUSE_MASK;
-	}
-
+	priv->info->read_fuses(priv);
 	return true;
 }
 
@@ -325,10 +335,12 @@ static void rcar_gen3_thermal_init(struct rcar_gen3_thermal_priv *priv,
 
 static const struct rcar_thermal_info rcar_m3w_thermal_info = {
 	.ths_tj_1 = 116,
+	.read_fuses = rcar_gen3_thermal_read_fuses_gen3,
 };
 
 static const struct rcar_thermal_info rcar_gen3_thermal_info = {
 	.ths_tj_1 = 126,
+	.read_fuses = rcar_gen3_thermal_read_fuses_gen3,
 };
 
 static const struct of_device_id rcar_gen3_thermal_dt_ids[] = {