diff options
Diffstat (limited to 'drivers/i2c/busses/i2c-mv64xxx.c')
| -rw-r--r-- | drivers/i2c/busses/i2c-mv64xxx.c | 120 |
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, }, }; |