ARM: zynq: Simplify SLCR initialization

Based on
"mfd: syscon: Decouple syscon interface from platform devices"
(sha1: bdb0066d)
SLCR driver can use syscon/regmap drivers directly.
Signed-off-by: Michal Simek <michal.simek@xilinx.com>

arch/arm/mach-zynq/common.c

@@ -146,8 +146,6 @@ static void __init zynq_init_machine(void)
 
 	platform_device_register(&zynq_cpuidle_device);
 	platform_device_register_full(&devinfo);
-
-	zynq_slcr_init();
 }
 
 static void __init zynq_timer_init(void)

arch/arm/mach-zynq/slcr.c

@@ -47,11 +47,6 @@ static struct regmap *zynq_slcr_regmap;
  */
 static int zynq_slcr_write(u32 val, u32 offset)
 {
-	if (!zynq_slcr_regmap) {
-		writel(val, zynq_slcr_base + offset);
-		return 0;
-	}
-
 	return regmap_write(zynq_slcr_regmap, offset, val);
 }
 
@@ -65,12 +60,7 @@ static int zynq_slcr_write(u32 val, u32 offset)
  */
 static int zynq_slcr_read(u32 *val, u32 offset)
 {
-	if (zynq_slcr_regmap)
-		return regmap_read(zynq_slcr_regmap, offset, val);
-
-	*val = readl(zynq_slcr_base + offset);
-
-	return 0;
+	return regmap_read(zynq_slcr_regmap, offset, val);
 }
 
 /**
@@ -195,23 +185,6 @@ void zynq_slcr_cpu_state_write(int cpu, bool die)
 	writel(state, zynq_slcr_base + SLCR_REBOOT_STATUS_OFFSET);
 }
 
-/**
- * zynq_slcr_init - Regular slcr driver init
- * Return:	0 on success, negative errno otherwise.
- *
- * Called early during boot from platform code to remap SLCR area.
- */
-int __init zynq_slcr_init(void)
-{
-	zynq_slcr_regmap = syscon_regmap_lookup_by_compatible("xlnx,zynq-slcr");
-	if (IS_ERR(zynq_slcr_regmap)) {
-		pr_err("%s: failed to find zynq-slcr\n", __func__);
-		return -ENODEV;
-	}
-
-	return 0;
-}
-
 /**
  * zynq_early_slcr_init - Early slcr init function
  *
@@ -237,6 +210,12 @@ int __init zynq_early_slcr_init(void)
 
 	np->data = (__force void *)zynq_slcr_base;
 
+	zynq_slcr_regmap = syscon_regmap_lookup_by_compatible("xlnx,zynq-slcr");
+	if (IS_ERR(zynq_slcr_regmap)) {
+		pr_err("%s: failed to find zynq-slcr\n", __func__);
+		return -ENODEV;
+	}
+
 	/* unlock the SLCR so that registers can be changed */
 	zynq_slcr_unlock();