[PATCH v4 2/2] MIPS: CPC: Map registers using DT in mips_cpc_default_phys_base()

From: Aleksandar Markovic <aleksandar.markovic@rt-rk.com>
To: linux-mips@linux-mips.org
Cc: Paul Burton <paul.burton@mips.com>,
	Miodrag Dinic <miodrag.dinic@mips.com>,
	Aleksandar Markovic <aleksandar.markovic@mips.com>,
	Dengcheng Zhu <dengcheng.zhu@mips.com>,
	Douglas Leung <douglas.leung@mips.com>,
	Goran Ferenc <goran.ferenc@mips.com>,
	James Hogan <james.hogan@mips.com>,
	James Hogan <jhogan@kernel.org>,
	linux-kernel@vger.kernel.org,
	Matt Redfearn <matt.redfearn@mips.com>,
	Petar Jovanovic <petar.jovanovic@mips.com>,
	Raghu Gandham <raghu.gandham@mips.com>,
	Ralf Baechle <ralf@linux-mips.org>
Subject: [PATCH v4 2/2] MIPS: CPC: Map registers using DT in mips_cpc_default_phys_base()
Date: Fri, 19 Jan 2018 16:40:49 +0100	[thread overview]
Message-ID: <1516376459-25672-3-git-send-email-aleksandar.markovic@rt-rk.com> (raw)
In-Reply-To: <1516376459-25672-1-git-send-email-aleksandar.markovic@rt-rk.com>

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

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@mips.com>
Signed-off-by: Miodrag Dinic <miodrag.dinic@mips.com>
Signed-off-by: Aleksandar Markovic <aleksandar.markovic@mips.com>
---
 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 19c88d7..fcf9af4 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;
 }
 
-- 
2.7.4
