Revert "i2c: core: support bus regulator controlling in adapter"

This reverts commit 6fe12cdb. Testing in
linux-next showed it needs some more time.
Signed-off-by: Wolfram Sang <wsa@kernel.org>

drivers/i2c/i2c-core-base.c

@@ -313,14 +313,12 @@ static int i2c_smbus_host_notify_to_irq(const struct i2c_client *client)
 static int i2c_device_probe(struct device *dev)
 {
 	struct i2c_client	*client = i2c_verify_client(dev);
-	struct i2c_adapter	*adap;
 	struct i2c_driver	*driver;
 	int status;
 
 	if (!client)
 		return 0;
 
-	adap = client->adapter;
 	driver = to_i2c_driver(dev->driver);
 
 	client->irq = client->init_irq;
@@ -386,12 +384,6 @@ static int i2c_device_probe(struct device *dev)
 
 	dev_dbg(dev, "probe\n");
 
-	status = regulator_enable(adap->bus_regulator);
-	if (status < 0) {
-		dev_err(&adap->dev, "Failed to enable power regulator\n");
-		goto err_clear_wakeup_irq;
-	}
-
 	status = of_clk_set_defaults(dev->of_node, false);
 	if (status < 0)
 		goto err_clear_wakeup_irq;
@@ -432,14 +424,12 @@ static int i2c_device_probe(struct device *dev)
 static int i2c_device_remove(struct device *dev)
 {
 	struct i2c_client	*client = i2c_verify_client(dev);
-	struct i2c_adapter      *adap;
 	struct i2c_driver	*driver;
 	int status = 0;
 
 	if (!client || !dev->driver)
 		return 0;
 
-	adap = client->adapter;
 	driver = to_i2c_driver(dev->driver);
 	if (driver->remove) {
 		dev_dbg(dev, "remove\n");
@@ -447,8 +437,6 @@ static int i2c_device_remove(struct device *dev)
 	}
 
 	dev_pm_domain_detach(&client->dev, true);
-	if (!pm_runtime_status_suspended(&client->dev))
-		regulator_disable(adap->bus_regulator);
 
 	dev_pm_clear_wake_irq(&client->dev);
 	device_init_wakeup(&client->dev, false);
@@ -460,72 +448,6 @@ static int i2c_device_remove(struct device *dev)
 	return status;
 }
 
-#ifdef CONFIG_PM_SLEEP
-static int i2c_resume_early(struct device *dev)
-{
-	struct i2c_client *client = i2c_verify_client(dev);
-	struct i2c_adapter *adap = client->adapter;
-	int err;
-
-	if (!pm_runtime_status_suspended(&client->dev)) {
-		err = regulator_enable(adap->bus_regulator);
-		if (err)
-			return err;
-	}
-
-	return pm_generic_resume_early(&client->dev);
-}
-
-static int i2c_suspend_late(struct device *dev)
-{
-	struct i2c_client *client = i2c_verify_client(dev);
-	struct i2c_adapter *adap = client->adapter;
-	int err;
-
-	err = pm_generic_suspend_late(&client->dev);
-	if (err)
-		return err;
-
-	if (!pm_runtime_status_suspended(&client->dev))
-		return regulator_disable(adap->bus_regulator);
-
-	return 0;
-}
-#endif
-
-#ifdef CONFIG_PM
-static int i2c_runtime_resume(struct device *dev)
-{
-	struct i2c_client *client = i2c_verify_client(dev);
-	struct i2c_adapter *adap = client->adapter;
-	int err;
-
-	err = regulator_enable(adap->bus_regulator);
-	if (err)
-		return err;
-
-	return pm_generic_runtime_resume(&client->dev);
-}
-
-static int i2c_runtime_suspend(struct device *dev)
-{
-	struct i2c_client *client = i2c_verify_client(dev);
-	struct i2c_adapter *adap = client->adapter;
-	int err;
-
-	err = pm_generic_runtime_suspend(&client->dev);
-	if (err)
-		return err;
-
-	return regulator_disable(adap->bus_regulator);
-}
-#endif
-
-static const struct dev_pm_ops i2c_device_pm = {
-	SET_LATE_SYSTEM_SLEEP_PM_OPS(i2c_suspend_late, i2c_resume_early)
-	SET_RUNTIME_PM_OPS(i2c_runtime_suspend, i2c_runtime_resume, NULL)
-};
-
 static void i2c_device_shutdown(struct device *dev)
 {
 	struct i2c_client *client = i2c_verify_client(dev);
@@ -583,7 +505,6 @@ struct bus_type i2c_bus_type = {
 	.probe		= i2c_device_probe,
 	.remove		= i2c_device_remove,
 	.shutdown	= i2c_device_shutdown,
-	.pm		= &i2c_device_pm,
 };
 EXPORT_SYMBOL_GPL(i2c_bus_type);
 
@@ -1422,11 +1343,6 @@ static int i2c_register_adapter(struct i2c_adapter *adap)
 	if (res)
 		goto out_reg;
 
-	adap->bus_regulator = devm_regulator_get(&adap->dev, "bus");
-	if (IS_ERR(adap->bus_regulator)) {
-		res = PTR_ERR(adap->bus_regulator);
-		goto out_reg;
-	}
 	dev_dbg(&adap->dev, "adapter [%s] registered\n", adap->name);
 
 	pm_runtime_no_callbacks(&adap->dev);

include/linux/i2c.h

@@ -15,7 +15,6 @@
 #include <linux/device.h>	/* for struct device */
 #include <linux/sched.h>	/* for completion */
 #include <linux/mutex.h>
-#include <linux/regulator/consumer.h>
 #include <linux/rtmutex.h>
 #include <linux/irqdomain.h>		/* for Host Notify IRQ */
 #include <linux/of.h>		/* for struct device_node */
@@ -716,7 +715,6 @@ struct i2c_adapter {
 	const struct i2c_adapter_quirks *quirks;
 
 	struct irq_domain *host_notify_domain;
-	struct regulator *bus_regulator;
 };
 #define to_i2c_adapter(d) container_of(d, struct i2c_adapter, dev)