aboutsummaryrefslogtreecommitdiff
path: root/drivers/i2c
diff options
context:
space:
mode:
Diffstat (limited to 'drivers/i2c')
-rw-r--r--drivers/i2c/busses/i2c-mv64xxx.c120
1 files changed, 78 insertions, 42 deletions
diff --git a/drivers/i2c/busses/i2c-mv64xxx.c b/drivers/i2c/busses/i2c-mv64xxx.c
index 5cfe70aedced..b03c344323d1 100644
--- a/drivers/i2c/busses/i2c-mv64xxx.c
+++ b/drivers/i2c/busses/i2c-mv64xxx.c
@@ -18,6 +18,7 @@
#include <linux/mv643xx_i2c.h>
#include <linux/platform_device.h>
#include <linux/pinctrl/consumer.h>
+#include <linux/pm_runtime.h>
#include <linux/reset.h>
#include <linux/io.h>
#include <linux/of.h>
@@ -717,6 +718,10 @@ mv64xxx_i2c_xfer(struct i2c_adapter *adap, struct i2c_msg msgs[], int num)
struct mv64xxx_i2c_data *drv_data = i2c_get_adapdata(adap);
int rc, ret = num;
+ rc = pm_runtime_resume_and_get(&adap->dev);
+ if (rc)
+ return rc;
+
BUG_ON(drv_data->msgs != NULL);
drv_data->msgs = msgs;
drv_data->num_msgs = num;
@@ -732,6 +737,9 @@ mv64xxx_i2c_xfer(struct i2c_adapter *adap, struct i2c_msg msgs[], int num)
drv_data->num_msgs = 0;
drv_data->msgs = NULL;
+ pm_runtime_mark_last_busy(&adap->dev);
+ pm_runtime_put_autosuspend(&adap->dev);
+
return ret;
}
@@ -828,7 +836,6 @@ mv64xxx_of_config(struct mv64xxx_i2c_data *drv_data,
rc = PTR_ERR(drv_data->rstc);
goto out;
}
- reset_control_deassert(drv_data->rstc);
/* Its not yet defined how timeouts will be specified in device tree.
* So hard code the value to 1 second.
@@ -894,6 +901,32 @@ static int mv64xxx_i2c_init_recovery_info(struct mv64xxx_i2c_data *drv_data,
}
static int
+mv64xxx_i2c_runtime_suspend(struct device *dev)
+{
+ struct mv64xxx_i2c_data *drv_data = dev_get_drvdata(dev);
+
+ reset_control_assert(drv_data->rstc);
+ clk_disable_unprepare(drv_data->reg_clk);
+ clk_disable_unprepare(drv_data->clk);
+
+ return 0;
+}
+
+static int
+mv64xxx_i2c_runtime_resume(struct device *dev)
+{
+ struct mv64xxx_i2c_data *drv_data = dev_get_drvdata(dev);
+
+ clk_prepare_enable(drv_data->clk);
+ clk_prepare_enable(drv_data->reg_clk);
+ reset_control_reset(drv_data->rstc);
+
+ mv64xxx_i2c_hw_init(drv_data);
+
+ return 0;
+}
+
+static int
mv64xxx_i2c_probe(struct platform_device *pd)
{
struct mv64xxx_i2c_data *drv_data;
@@ -920,18 +953,22 @@ mv64xxx_i2c_probe(struct platform_device *pd)
/* Not all platforms have clocks */
drv_data->clk = devm_clk_get(&pd->dev, NULL);
- if (PTR_ERR(drv_data->clk) == -EPROBE_DEFER)
- return -EPROBE_DEFER;
- if (!IS_ERR(drv_data->clk))
- clk_prepare_enable(drv_data->clk);
+ if (IS_ERR(drv_data->clk)) {
+ if (PTR_ERR(drv_data->clk) == -EPROBE_DEFER)
+ return -EPROBE_DEFER;
+ drv_data->clk = NULL;
+ }
drv_data->reg_clk = devm_clk_get(&pd->dev, "reg");
- if (PTR_ERR(drv_data->reg_clk) == -EPROBE_DEFER)
- return -EPROBE_DEFER;
- if (!IS_ERR(drv_data->reg_clk))
- clk_prepare_enable(drv_data->reg_clk);
+ if (IS_ERR(drv_data->reg_clk)) {
+ if (PTR_ERR(drv_data->reg_clk) == -EPROBE_DEFER)
+ return -EPROBE_DEFER;
+ drv_data->reg_clk = NULL;
+ }
drv_data->irq = platform_get_irq(pd, 0);
+ if (drv_data->irq < 0)
+ return drv_data->irq;
if (pdata) {
drv_data->freq_m = pdata->freq_m;
@@ -942,16 +979,12 @@ mv64xxx_i2c_probe(struct platform_device *pd)
} else if (pd->dev.of_node) {
rc = mv64xxx_of_config(drv_data, &pd->dev);
if (rc)
- goto exit_clk;
- }
- if (drv_data->irq < 0) {
- rc = drv_data->irq;
- goto exit_reset;
+ return rc;
}
rc = mv64xxx_i2c_init_recovery_info(drv_data, &pd->dev);
if (rc == -EPROBE_DEFER)
- goto exit_reset;
+ return rc;
drv_data->adapter.dev.parent = &pd->dev;
drv_data->adapter.algo = &mv64xxx_i2c_algo;
@@ -962,7 +995,14 @@ mv64xxx_i2c_probe(struct platform_device *pd)
platform_set_drvdata(pd, drv_data);
i2c_set_adapdata(&drv_data->adapter, drv_data);
- mv64xxx_i2c_hw_init(drv_data);
+ pm_runtime_set_autosuspend_delay(&pd->dev, MSEC_PER_SEC);
+ pm_runtime_use_autosuspend(&pd->dev);
+ pm_runtime_enable(&pd->dev);
+ if (!pm_runtime_enabled(&pd->dev)) {
+ rc = mv64xxx_i2c_runtime_resume(&pd->dev);
+ if (rc)
+ goto exit_disable_pm;
+ }
rc = request_irq(drv_data->irq, mv64xxx_i2c_intr, 0,
MV64XXX_I2C_CTLR_NAME, drv_data);
@@ -970,7 +1010,7 @@ mv64xxx_i2c_probe(struct platform_device *pd)
dev_err(&drv_data->adapter.dev,
"mv64xxx: Can't register intr handler irq%d: %d\n",
drv_data->irq, rc);
- goto exit_reset;
+ goto exit_disable_pm;
} else if ((rc = i2c_add_numbered_adapter(&drv_data->adapter)) != 0) {
dev_err(&drv_data->adapter.dev,
"mv64xxx: Can't add i2c adapter, rc: %d\n", -rc);
@@ -981,54 +1021,50 @@ mv64xxx_i2c_probe(struct platform_device *pd)
exit_free_irq:
free_irq(drv_data->irq, drv_data);
-exit_reset:
- reset_control_assert(drv_data->rstc);
-exit_clk:
- clk_disable_unprepare(drv_data->reg_clk);
- clk_disable_unprepare(drv_data->clk);
+exit_disable_pm:
+ pm_runtime_disable(&pd->dev);
+ if (!pm_runtime_status_suspended(&pd->dev))
+ mv64xxx_i2c_runtime_suspend(&pd->dev);
return rc;
}
static int
-mv64xxx_i2c_remove(struct platform_device *dev)
+mv64xxx_i2c_remove(struct platform_device *pd)
{
- struct mv64xxx_i2c_data *drv_data = platform_get_drvdata(dev);
+ struct mv64xxx_i2c_data *drv_data = platform_get_drvdata(pd);
i2c_del_adapter(&drv_data->adapter);
free_irq(drv_data->irq, drv_data);
- reset_control_assert(drv_data->rstc);
- clk_disable_unprepare(drv_data->reg_clk);
- clk_disable_unprepare(drv_data->clk);
+ pm_runtime_disable(&pd->dev);
+ if (!pm_runtime_status_suspended(&pd->dev))
+ mv64xxx_i2c_runtime_suspend(&pd->dev);
return 0;
}
-#ifdef CONFIG_PM
-static int mv64xxx_i2c_resume(struct device *dev)
+static void
+mv64xxx_i2c_shutdown(struct platform_device *pd)
{
- struct mv64xxx_i2c_data *drv_data = dev_get_drvdata(dev);
-
- mv64xxx_i2c_hw_init(drv_data);
-
- return 0;
+ pm_runtime_disable(&pd->dev);
+ if (!pm_runtime_status_suspended(&pd->dev))
+ mv64xxx_i2c_runtime_suspend(&pd->dev);
}
-static const struct dev_pm_ops mv64xxx_i2c_pm = {
- .resume = mv64xxx_i2c_resume,
+static const struct dev_pm_ops mv64xxx_i2c_pm_ops = {
+ SET_RUNTIME_PM_OPS(mv64xxx_i2c_runtime_suspend,
+ mv64xxx_i2c_runtime_resume, NULL)
+ SET_NOIRQ_SYSTEM_SLEEP_PM_OPS(pm_runtime_force_suspend,
+ pm_runtime_force_resume)
};
-#define mv64xxx_i2c_pm_ops (&mv64xxx_i2c_pm)
-#else
-#define mv64xxx_i2c_pm_ops NULL
-#endif
-
static struct platform_driver mv64xxx_i2c_driver = {
.probe = mv64xxx_i2c_probe,
.remove = mv64xxx_i2c_remove,
+ .shutdown = mv64xxx_i2c_shutdown,
.driver = {
.name = MV64XXX_I2C_CTLR_NAME,
- .pm = mv64xxx_i2c_pm_ops,
+ .pm = &mv64xxx_i2c_pm_ops,
.of_match_table = mv64xxx_i2c_of_match_table,
},
};
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-20 15:05:39 +0000