OF: MIPS: lantiq: implement OF support

Activate USE_OF, add a sample DTS file and convert the core soc code to OF.

Signed-off-by: John Crispin <blogic@openwrt.org>
Cc: linux-mips@linux-mips.org
Cc: devicetree-discuss@lists.ozlabs.org
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/3803/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

2 files changed, 13 insertions, 20 deletions

diff --git a/arch/mips/lantiq/xway/ebu.c b/arch/mips/lantiq/xway/ebu.c
index 862e3e830680..419b47b70f32 100644
--- a/arch/mips/lantiq/xway/ebu.c
+++ b/arch/mips/lantiq/xway/ebu.c
@@ -14,10 +14,6 @@
 
 #include <lantiq_soc.h>
 
-/* all access to the ebu must be locked */
-DEFINE_SPINLOCK(ebu_lock);
-EXPORT_SYMBOL_GPL(ebu_lock);
-
 static struct resource ltq_ebu_resource = {
 	.name	= "ebu",
 	.start	= LTQ_EBU_BASE_ADDR,
diff --git a/arch/mips/lantiq/xway/reset.c b/arch/mips/lantiq/xway/reset.c
index 3327211746ac..22c55f73aa9d 100644
--- a/arch/mips/lantiq/xway/reset.c
+++ b/arch/mips/lantiq/xway/reset.c
@@ -37,13 +37,6 @@
 #define RCU_BOOT_SEL_SHIFT	26
 #define RCU_BOOT_SEL_MASK	0x7
 
-static struct resource ltq_rcu_resource = {
-	.name   = "rcu",
-	.start  = LTQ_RCU_BASE_ADDR,
-	.end    = LTQ_RCU_BASE_ADDR + LTQ_RCU_SIZE - 1,
-	.flags  = IORESOURCE_MEM,
-};
-
 /* remapped base addr of the reset control unit */
 static void __iomem *ltq_rcu_membase;
 
@@ -91,17 +84,21 @@ static void ltq_machine_power_off(void)
 
 static int __init mips_reboot_setup(void)
 {
-	/* insert and request the memory region */
-	if (insert_resource(&iomem_resource, &ltq_rcu_resource) < 0)
-		panic("Failed to insert rcu memory");
+	struct resource res;
+	struct device_node *np =
+		of_find_compatible_node(NULL, NULL, "lantiq,rcu-xway");
+
+	/* check if all the reset register range is available */
+	if (!np)
+		panic("Failed to load reset resources from devicetree");
+
+	if (of_address_to_resource(np, 0, &res))
+		panic("Failed to get rcu memory range");
 
-	if (request_mem_region(ltq_rcu_resource.start,
-			resource_size(&ltq_rcu_resource), "rcu") < 0)
-		panic("Failed to request rcu memory");
+	if (request_mem_region(res.start, resource_size(&res), res.name) < 0)
+		pr_err("Failed to request rcu memory");
 
-	/* remap rcu register range */
-	ltq_rcu_membase = ioremap_nocache(ltq_rcu_resource.start,
-				resource_size(&ltq_rcu_resource));
+	ltq_rcu_membase = ioremap_nocache(res.start, resource_size(&res));
 	if (!ltq_rcu_membase)
 		panic("Failed to remap core memory");