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authorMark Brown <broonie@opensource.wolfsonmicro.com>2012-01-21 17:28:47 +0400
committerWolfram Sang <w.sang@pengutronix.de>2012-03-07 22:06:59 +0400
commitc62c3ca55e0db52b311b1258ed08bc6c7525195e (patch)
tree7248f0df1fc8c47c6115b19cf2251f0e97feccf2 /drivers/i2c
parent4ea1557ff7862f63511420395d16647b74ba6f5c (diff)
downloadlinux-c62c3ca55e0db52b311b1258ed08bc6c7525195e.tar.xz
i2c-s3c2410: Add stub runtime power management
Add stub runtime_pm calls which go through the flow of enabling and disabling but don't actually do anything with the device itself as there's nothing useful we can do. This provides the core PM framework with information about when the device is idle, enabling chip wide power savings. Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com> Acked-by: Heiko Stuebner <heiko@sntech.de> Signed-off-by: Ben Dooks <ben-linux@fluff.org> Signed-off-by: Wolfram Sang <w.sang@pengutronix.de>
Diffstat (limited to 'drivers/i2c')
-rw-r--r--drivers/i2c/busses/i2c-s3c2410.c10
1 files changed, 10 insertions, 0 deletions
diff --git a/drivers/i2c/busses/i2c-s3c2410.c b/drivers/i2c/busses/i2c-s3c2410.c
index e6f982be89a8..737f7218a32c 100644
--- a/drivers/i2c/busses/i2c-s3c2410.c
+++ b/drivers/i2c/busses/i2c-s3c2410.c
@@ -31,6 +31,7 @@
#include <linux/errno.h>
#include <linux/err.h>
#include <linux/platform_device.h>
+#include <linux/pm_runtime.h>
#include <linux/clk.h>
#include <linux/cpufreq.h>
#include <linux/slab.h>
@@ -564,6 +565,7 @@ static int s3c24xx_i2c_xfer(struct i2c_adapter *adap,
int retry;
int ret;
+ pm_runtime_get_sync(&adap->dev);
clk_enable(i2c->clk);
for (retry = 0; retry < adap->retries; retry++) {
@@ -572,6 +574,7 @@ static int s3c24xx_i2c_xfer(struct i2c_adapter *adap,
if (ret != -EAGAIN) {
clk_disable(i2c->clk);
+ pm_runtime_put_sync(&adap->dev);
return ret;
}
@@ -581,6 +584,7 @@ static int s3c24xx_i2c_xfer(struct i2c_adapter *adap,
}
clk_disable(i2c->clk);
+ pm_runtime_put_sync(&adap->dev);
return -EREMOTEIO;
}
@@ -1013,6 +1017,9 @@ static int s3c24xx_i2c_probe(struct platform_device *pdev)
of_i2c_register_devices(&i2c->adap);
platform_set_drvdata(pdev, i2c);
+ pm_runtime_enable(&pdev->dev);
+ pm_runtime_enable(&i2c->adap.dev);
+
dev_info(&pdev->dev, "%s: S3C I2C adapter\n", dev_name(&i2c->adap.dev));
clk_disable(i2c->clk);
return 0;
@@ -1047,6 +1054,9 @@ static int s3c24xx_i2c_remove(struct platform_device *pdev)
{
struct s3c24xx_i2c *i2c = platform_get_drvdata(pdev);
+ pm_runtime_disable(&i2c->adap.dev);
+ pm_runtime_disable(&pdev->dev);
+
s3c24xx_i2c_deregister_cpufreq(i2c);
i2c_del_adapter(&i2c->adap);