diff options
Diffstat (limited to 'drivers/pwm')
-rw-r--r-- | drivers/pwm/core.c | 26 | ||||
-rw-r--r-- | drivers/pwm/pwm-pxa.c | 16 | ||||
-rw-r--r-- | drivers/pwm/pwm-tegra.c | 82 |
3 files changed, 91 insertions, 33 deletions
diff --git a/drivers/pwm/core.c b/drivers/pwm/core.c index 57b8cedfec3f..c7552df32082 100644 --- a/drivers/pwm/core.c +++ b/drivers/pwm/core.c @@ -152,6 +152,32 @@ of_pwm_xlate_with_flags(struct pwm_chip *pc, const struct of_phandle_args *args) } EXPORT_SYMBOL_GPL(of_pwm_xlate_with_flags); +struct pwm_device * +of_pwm_single_xlate(struct pwm_chip *pc, const struct of_phandle_args *args) +{ + struct pwm_device *pwm; + + if (pc->of_pwm_n_cells < 1) + return ERR_PTR(-EINVAL); + + /* validate that one cell is specified, optionally with flags */ + if (args->args_count != 1 && args->args_count != 2) + return ERR_PTR(-EINVAL); + + pwm = pwm_request_from_chip(pc, 0, NULL); + if (IS_ERR(pwm)) + return pwm; + + pwm->args.period = args->args[0]; + pwm->args.polarity = PWM_POLARITY_NORMAL; + + if (args->args_count == 2 && args->args[2] & PWM_POLARITY_INVERTED) + pwm->args.polarity = PWM_POLARITY_INVERSED; + + return pwm; +} +EXPORT_SYMBOL_GPL(of_pwm_single_xlate); + static void of_pwmchip_add(struct pwm_chip *chip) { if (!chip->dev || !chip->dev->of_node) diff --git a/drivers/pwm/pwm-pxa.c b/drivers/pwm/pwm-pxa.c index a9efdcf839ae..238ec88c130b 100644 --- a/drivers/pwm/pwm-pxa.c +++ b/drivers/pwm/pwm-pxa.c @@ -148,20 +148,6 @@ static const struct platform_device_id *pxa_pwm_get_id_dt(struct device *dev) return id ? id->data : NULL; } -static struct pwm_device * -pxa_pwm_of_xlate(struct pwm_chip *pc, const struct of_phandle_args *args) -{ - struct pwm_device *pwm; - - pwm = pwm_request_from_chip(pc, 0, NULL); - if (IS_ERR(pwm)) - return pwm; - - pwm->args.period = args->args[0]; - - return pwm; -} - static int pwm_probe(struct platform_device *pdev) { const struct platform_device_id *id = platform_get_device_id(pdev); @@ -187,7 +173,7 @@ static int pwm_probe(struct platform_device *pdev) pc->chip.npwm = (id->driver_data & HAS_SECONDARY_PWM) ? 2 : 1; if (IS_ENABLED(CONFIG_OF)) { - pc->chip.of_xlate = pxa_pwm_of_xlate; + pc->chip.of_xlate = of_pwm_single_xlate; pc->chip.of_pwm_n_cells = 1; } diff --git a/drivers/pwm/pwm-tegra.c b/drivers/pwm/pwm-tegra.c index 11a10b575ace..18cf974ac776 100644 --- a/drivers/pwm/pwm-tegra.c +++ b/drivers/pwm/pwm-tegra.c @@ -42,12 +42,16 @@ #include <linux/module.h> #include <linux/of.h> #include <linux/of_device.h> +#include <linux/pm_opp.h> #include <linux/pwm.h> #include <linux/platform_device.h> #include <linux/pinctrl/consumer.h> +#include <linux/pm_runtime.h> #include <linux/slab.h> #include <linux/reset.h> +#include <soc/tegra/common.h> + #define PWM_ENABLE (1 << 31) #define PWM_DUTY_WIDTH 8 #define PWM_DUTY_SHIFT 16 @@ -145,7 +149,7 @@ static int tegra_pwm_config(struct pwm_chip *chip, struct pwm_device *pwm, required_clk_rate = (NSEC_PER_SEC / period_ns) << PWM_DUTY_WIDTH; - err = clk_set_rate(pc->clk, required_clk_rate); + err = dev_pm_opp_set_rate(pc->dev, required_clk_rate); if (err < 0) return -EINVAL; @@ -181,8 +185,8 @@ static int tegra_pwm_config(struct pwm_chip *chip, struct pwm_device *pwm, * before writing the register. Otherwise, keep it enabled. */ if (!pwm_is_enabled(pwm)) { - err = clk_prepare_enable(pc->clk); - if (err < 0) + err = pm_runtime_resume_and_get(pc->dev); + if (err) return err; } else val |= PWM_ENABLE; @@ -193,7 +197,7 @@ static int tegra_pwm_config(struct pwm_chip *chip, struct pwm_device *pwm, * If the PWM is not enabled, turn the clock off again to save power. */ if (!pwm_is_enabled(pwm)) - clk_disable_unprepare(pc->clk); + pm_runtime_put(pc->dev); return 0; } @@ -204,8 +208,8 @@ static int tegra_pwm_enable(struct pwm_chip *chip, struct pwm_device *pwm) int rc = 0; u32 val; - rc = clk_prepare_enable(pc->clk); - if (rc < 0) + rc = pm_runtime_resume_and_get(pc->dev); + if (rc) return rc; val = pwm_readl(pc, pwm->hwpwm); @@ -224,7 +228,7 @@ static void tegra_pwm_disable(struct pwm_chip *chip, struct pwm_device *pwm) val &= ~PWM_ENABLE; pwm_writel(pc, pwm->hwpwm, val); - clk_disable_unprepare(pc->clk); + pm_runtime_put_sync(pc->dev); } static const struct pwm_ops tegra_pwm_ops = { @@ -256,11 +260,20 @@ static int tegra_pwm_probe(struct platform_device *pdev) if (IS_ERR(pwm->clk)) return PTR_ERR(pwm->clk); + ret = devm_tegra_core_dev_init_opp_table_common(&pdev->dev); + if (ret) + return ret; + + pm_runtime_enable(&pdev->dev); + ret = pm_runtime_resume_and_get(&pdev->dev); + if (ret) + return ret; + /* Set maximum frequency of the IP */ - ret = clk_set_rate(pwm->clk, pwm->soc->max_frequency); + ret = dev_pm_opp_set_rate(pwm->dev, pwm->soc->max_frequency); if (ret < 0) { dev_err(&pdev->dev, "Failed to set max frequency: %d\n", ret); - return ret; + goto put_pm; } /* @@ -278,7 +291,7 @@ static int tegra_pwm_probe(struct platform_device *pdev) if (IS_ERR(pwm->rst)) { ret = PTR_ERR(pwm->rst); dev_err(&pdev->dev, "Reset control is not found: %d\n", ret); - return ret; + goto put_pm; } reset_control_deassert(pwm->rst); @@ -291,10 +304,16 @@ static int tegra_pwm_probe(struct platform_device *pdev) if (ret < 0) { dev_err(&pdev->dev, "pwmchip_add() failed: %d\n", ret); reset_control_assert(pwm->rst); - return ret; + goto put_pm; } + pm_runtime_put(&pdev->dev); + return 0; +put_pm: + pm_runtime_put_sync_suspend(&pdev->dev); + pm_runtime_force_suspend(&pdev->dev); + return ret; } static int tegra_pwm_remove(struct platform_device *pdev) @@ -305,20 +324,44 @@ static int tegra_pwm_remove(struct platform_device *pdev) reset_control_assert(pc->rst); + pm_runtime_force_suspend(&pdev->dev); + return 0; } -#ifdef CONFIG_PM_SLEEP -static int tegra_pwm_suspend(struct device *dev) +static int __maybe_unused tegra_pwm_runtime_suspend(struct device *dev) { - return pinctrl_pm_select_sleep_state(dev); + struct tegra_pwm_chip *pc = dev_get_drvdata(dev); + int err; + + clk_disable_unprepare(pc->clk); + + err = pinctrl_pm_select_sleep_state(dev); + if (err) { + clk_prepare_enable(pc->clk); + return err; + } + + return 0; } -static int tegra_pwm_resume(struct device *dev) +static int __maybe_unused tegra_pwm_runtime_resume(struct device *dev) { - return pinctrl_pm_select_default_state(dev); + struct tegra_pwm_chip *pc = dev_get_drvdata(dev); + int err; + + err = pinctrl_pm_select_default_state(dev); + if (err) + return err; + + err = clk_prepare_enable(pc->clk); + if (err) { + pinctrl_pm_select_sleep_state(dev); + return err; + } + + return 0; } -#endif static const struct tegra_pwm_soc tegra20_pwm_soc = { .num_channels = 4, @@ -344,7 +387,10 @@ static const struct of_device_id tegra_pwm_of_match[] = { MODULE_DEVICE_TABLE(of, tegra_pwm_of_match); static const struct dev_pm_ops tegra_pwm_pm_ops = { - SET_SYSTEM_SLEEP_PM_OPS(tegra_pwm_suspend, tegra_pwm_resume) + SET_RUNTIME_PM_OPS(tegra_pwm_runtime_suspend, tegra_pwm_runtime_resume, + NULL) + SET_SYSTEM_SLEEP_PM_OPS(pm_runtime_force_suspend, + pm_runtime_force_resume) }; static struct platform_driver tegra_pwm_driver = { |