unimore/kernel-hacking-2024-linux-steffo
unimore/kernel-hacking-2024-linux-steffo
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i2c-s3c2410: Add stub runtime power management

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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>
This commit is contained in:
Mark Brown 2012-01-21 13:28:47 +00:00 committed by Wolfram Sang
parent 4ea1557ff7
commit c62c3ca55e
1 changed files with 10 additions and 0 deletions
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10
drivers/i2c/busses/i2c-s3c2410.c
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@ -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);