MIPS: CPC: Map registers using DT in mips_cpc_default_phys_base()

Web:        https://git.kernel.org/torvalds/c/791412dafbbfd860e78983d45cf71db603a82f67
Commit:     791412dafbbfd860e78983d45cf71db603a82f67
Parent:     aece34cd576c7625181b0488a8129c1e165355f7
Refname:    refs/heads/master
Author:     Paul Burton <[email protected]>
AuthorDate: Fri Jan 19 16:40:49 2018 +0100
Committer:  James Hogan <[email protected]>
CommitDate: Thu Feb 8 14:02:01 2018 +0000

    MIPS: CPC: Map registers using DT in mips_cpc_default_phys_base()
    
    Reading mips_cpc_base value from the DT allows each platform to
    define it according to its needs. This is especially convenient
    for MIPS_GENERIC kernel where this kind of information should be
    determined in runtime.
    
    Use mti,mips-cpc compatible string with just a reg property to
    specify the register location for your platform.
    
    Signed-off-by: Paul Burton <[email protected]>
    Signed-off-by: Miodrag Dinic <[email protected]>
    Signed-off-by: Aleksandar Markovic <[email protected]>
    Cc: [email protected]
    Cc: Ralf Baechle <[email protected]>
    Patchwork: https://patchwork.linux-mips.org/patch/18513/
    Signed-off-by: James Hogan <[email protected]>
---
 arch/mips/kernel/mips-cpc.c | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/arch/mips/kernel/mips-cpc.c b/arch/mips/kernel/mips-cpc.c
index 19c88d770054..fcf9af492d60 100644
--- a/arch/mips/kernel/mips-cpc.c
+++ b/arch/mips/kernel/mips-cpc.c
@@ -10,6 +10,8 @@
 
 #include <linux/errno.h>
 #include <linux/percpu.h>
+#include <linux/of.h>
+#include <linux/of_address.h>
 #include <linux/spinlock.h>
 
 #include <asm/mips-cps.h>
@@ -22,6 +24,17 @@ static DEFINE_PER_CPU_ALIGNED(unsigned long, cpc_core_lock_flags);
 
 phys_addr_t __weak mips_cpc_default_phys_base(void)
 {
+	struct device_node *cpc_node;
+	struct resource res;
+	int err;
+
+	cpc_node = of_find_compatible_node(of_root, NULL, "mti,mips-cpc");
+	if (cpc_node) {
+		err = of_address_to_resource(cpc_node, 0, &res);
+		if (!err)
+			return res.start;
+	}
+
 	return 0;
 }
 
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