ARM: zynq: Split slcr in two parts

Split the slcr into an early part for unlocking and cpu starting
and a later syscon driver.
Also add "syscon" compatible property for slcr.

Signed-off-by: Steffen Trumtrar <s.trumtrar@pengutronix.de>
Signed-off-by: Michal Simek <michal.simek@xilinx.com>

4 files changed, 29 insertions, 3 deletions

diff --git a/arch/arm/mach-zynq/Kconfig b/arch/arm/mach-zynq/Kconfig
index 6b04260aa142..323e5053cb9f 100644
--- a/arch/arm/mach-zynq/Kconfig
+++ b/arch/arm/mach-zynq/Kconfig
@@ -14,5 +14,6 @@ config ARCH_ZYNQ
         select SPARSE_IRQ
         select CADENCE_TTC_TIMER
         select ARM_GLOBAL_TIMER
+        select MFD_SYSCON
         help
           Support for Xilinx Zynq ARM Cortex A9 Platform
diff --git a/arch/arm/mach-zynq/common.c b/arch/arm/mach-zynq/common.c
index bf6717f5cd3c..38401cf78383 100644
--- a/arch/arm/mach-zynq/common.c
+++ b/arch/arm/mach-zynq/common.c
@@ -59,11 +59,13 @@ static void __init zynq_init_machine(void)
         of_platform_populate(NULL, of_default_bus_match_table, NULL, NULL);
 
         platform_device_register(&zynq_cpuidle_device);
+
+        zynq_slcr_init();
 }
 
 static void __init zynq_timer_init(void)
 {
-        zynq_slcr_init();
+        zynq_early_slcr_init();
 
         zynq_clock_init(zynq_slcr_base);
         clocksource_of_init();
diff --git a/arch/arm/mach-zynq/common.h b/arch/arm/mach-zynq/common.h
index c22c92cea8cb..1548b85b56ad 100644
--- a/arch/arm/mach-zynq/common.h
+++ b/arch/arm/mach-zynq/common.h
@@ -20,6 +20,7 @@
 void zynq_secondary_startup(void);
 
 extern int zynq_slcr_init(void);
+extern int zynq_early_slcr_init(void);
 extern void zynq_slcr_system_reset(void);
 extern void zynq_slcr_cpu_stop(int cpu);
 extern void zynq_slcr_cpu_start(int cpu);
diff --git a/arch/arm/mach-zynq/slcr.c b/arch/arm/mach-zynq/slcr.c
index 59ad09ff3bc0..899f97925729 100644
--- a/arch/arm/mach-zynq/slcr.c
+++ b/arch/arm/mach-zynq/slcr.c
@@ -15,7 +15,9 @@
  */
 
 #include <linux/io.h>
+#include <linux/mfd/syscon.h>
 #include <linux/of_address.h>
+#include <linux/regmap.h>
 #include <linux/clk/zynq.h>
 #include "common.h"
 
@@ -30,6 +32,7 @@
 #define SLCR_A9_CPU_RST                 0x1
 
 void __iomem *zynq_slcr_base;
+static struct regmap *zynq_slcr_regmap;
 
 /**
  * zynq_slcr_system_reset - Reset the entire system.
@@ -80,13 +83,32 @@ void zynq_slcr_cpu_stop(int cpu)
 }
 
 /**
- * zynq_slcr_init
- * Returns 0 on success, negative errno otherwise.
+ * 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
+ *
+ * Return:      0 on success, negative errno otherwise.
+ *
+ * Called very early during boot from platform code to unlock SLCR.
+ */
+int __init zynq_early_slcr_init(void)
+{
         struct device_node *np;
 
         np = of_find_compatible_node(NULL, NULL, "xlnx,zynq-slcr");