linux-kernel - [PATCH 4.15 079/146] MIPS: CPC: Map registers using DT in mips_cpc_default_phys

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Message-Id: <20180313152326.901035436@linuxfoundation.org>
Date:   Tue, 13 Mar 2018 16:24:06 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Paul Burton <paul.burton@...s.com>,
        Miodrag Dinic <miodrag.dinic@...s.com>,
        Aleksandar Markovic <aleksandar.markovic@...s.com>,
        linux-mips@...ux-mips.org, Ralf Baechle <ralf@...ux-mips.org>,
        James Hogan <jhogan@...nel.org>
Subject: [PATCH 4.15 079/146] MIPS: CPC: Map registers using DT in mips_cpc_default_phys_base()

4.15-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Paul Burton <paul.burton@...s.com>

commit 791412dafbbfd860e78983d45cf71db603a82f67 upstream.

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 <paul.burton@...s.com>
Signed-off-by: Miodrag Dinic <miodrag.dinic@...s.com>
Signed-off-by: Aleksandar Markovic <aleksandar.markovic@...s.com>
Cc: linux-mips@...ux-mips.org
Cc: Ralf Baechle <ralf@...ux-mips.org>
Patchwork: https://patchwork.linux-mips.org/patch/18513/
Signed-off-by: James Hogan <jhogan@...nel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 arch/mips/kernel/mips-cpc.c |   13 +++++++++++++
 1 file changed, 13 insertions(+)

--- 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 l
 
 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;
 }