linux-kernel - [RFC][PATCH 5/5] PM / shmobile: Allow device latencies to be read from a DT

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Date:	Sat, 21 Jul 2012 23:56:28 +0200
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	Linux PM list <linux-pm@...r.kernel.org>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Magnus Damm <magnus.damm@...il.com>,
	Arnd Bergmann <arnd@...db.de>,
	"Linux-sh list" <linux-sh@...r.kernel.org>,
	Olof Johansson <olof@...om.net>
Subject: [RFC][PATCH 5/5] PM / shmobile: Allow device latencies to be read from a DT


Modify rmobile_read_domain_from_dt() so that it can read device
latency information from the device tree along with the PM
domain name and make it use rmobile_add_device_to_domain_td()
for adding the device to the PM domain along with the device latency
data.

Signed-off-by: Rafael J. Wysocki <rjw@...k.pl>
---
 arch/arm/mach-shmobile/pm-rmobile.c |   24 ++++++++++++++++++++++--
 1 file changed, 22 insertions(+), 2 deletions(-)

Index: linux/arch/arm/mach-shmobile/pm-rmobile.c
===================================================================
--- linux.orig/arch/arm/mach-shmobile/pm-rmobile.c
+++ linux/arch/arm/mach-shmobile/pm-rmobile.c
@@ -170,14 +170,34 @@ void rmobile_add_device_to_domain_td(con
 
 static void rmobile_read_domain_from_dt(struct device *dev)
 {
+	struct gpd_timing_data latencies = { 0 };
 	const char *domain_name;
+	u64 val;
 	int ret;
 
 	ret = of_property_read_string(dev->of_node, "renesas,pmdomain",
 				      &domain_name);
+	if (ret)
+		return;
+
+	ret = of_property_read_u64(dev->of_node, "pm-stop-latency", &val);
+	if (!ret)
+		latencies.stop_latency_ns = val;
+
+	ret = of_property_read_u64(dev->of_node, "pm-start-latency", &val);
+	if (!ret)
+		latencies.start_latency_ns = val;
+
+	ret = of_property_read_u64(dev->of_node, "pm-save-latency", &val);
+	if (!ret)
+		latencies.save_state_latency_ns = val;
+
+	ret = of_property_read_u64(dev->of_node, "pm-restore-latency", &val);
 	if (!ret)
-		rmobile_add_device_to_domain(domain_name,
-					     to_platform_device(dev));
+		latencies.restore_state_latency_ns = val;
+
+	rmobile_add_device_to_domain_td(domain_name, to_platform_device(dev),
+					&latencies);
 }
 
 static void rmobile_remove_from_domain(struct device *dev)

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