diff options
Diffstat (limited to 'drivers/pwm/pwm-imx-tpm.c')
| -rw-r--r-- | drivers/pwm/pwm-imx-tpm.c | 64 |
1 files changed, 42 insertions, 22 deletions
diff --git a/drivers/pwm/pwm-imx-tpm.c b/drivers/pwm/pwm-imx-tpm.c index 9fc290e647e1..7ee7b65b9b90 100644 --- a/drivers/pwm/pwm-imx-tpm.c +++ b/drivers/pwm/pwm-imx-tpm.c @@ -20,6 +20,7 @@ #include <linux/io.h> #include <linux/module.h> #include <linux/of.h> +#include <linux/pinctrl/consumer.h> #include <linux/platform_device.h> #include <linux/pwm.h> #include <linux/slab.h> @@ -57,7 +58,6 @@ #define PWM_IMX_TPM_MOD_MOD GENMASK(PWM_IMX_TPM_MOD_WIDTH - 1, 0) struct imx_tpm_pwm_chip { - struct pwm_chip chip; struct clk *clk; void __iomem *base; struct mutex lock; @@ -75,7 +75,7 @@ struct imx_tpm_pwm_param { static inline struct imx_tpm_pwm_chip * to_imx_tpm_pwm_chip(struct pwm_chip *chip) { - return container_of(chip, struct imx_tpm_pwm_chip, chip); + return pwmchip_get_drvdata(chip); } /* @@ -106,7 +106,9 @@ static int pwm_imx_tpm_round_state(struct pwm_chip *chip, p->prescale = prescale; period_count = (clock_unit + ((1 << prescale) >> 1)) >> prescale; - p->mod = period_count; + if (period_count == 0) + return -EINVAL; + p->mod = period_count - 1; /* calculate real period HW can support */ tmp = (u64)period_count << prescale; @@ -336,35 +338,42 @@ static const struct pwm_ops imx_tpm_pwm_ops = { static int pwm_imx_tpm_probe(struct platform_device *pdev) { + struct pwm_chip *chip; struct imx_tpm_pwm_chip *tpm; + struct clk *clk; + void __iomem *base; int ret; + unsigned int npwm; u32 val; - tpm = devm_kzalloc(&pdev->dev, sizeof(*tpm), GFP_KERNEL); - if (!tpm) - return -ENOMEM; + base = devm_platform_ioremap_resource(pdev, 0); + if (IS_ERR(base)) + return PTR_ERR(base); - platform_set_drvdata(pdev, tpm); + clk = devm_clk_get_enabled(&pdev->dev, NULL); + if (IS_ERR(clk)) + return dev_err_probe(&pdev->dev, PTR_ERR(clk), + "failed to get PWM clock\n"); + + /* get number of channels */ + val = readl(base + PWM_IMX_TPM_PARAM); + npwm = FIELD_GET(PWM_IMX_TPM_PARAM_CHAN, val); - tpm->base = devm_platform_ioremap_resource(pdev, 0); - if (IS_ERR(tpm->base)) - return PTR_ERR(tpm->base); + chip = devm_pwmchip_alloc(&pdev->dev, npwm, sizeof(*tpm)); + if (IS_ERR(chip)) + return PTR_ERR(chip); + tpm = to_imx_tpm_pwm_chip(chip); - tpm->clk = devm_clk_get_enabled(&pdev->dev, NULL); - if (IS_ERR(tpm->clk)) - return dev_err_probe(&pdev->dev, PTR_ERR(tpm->clk), - "failed to get PWM clock\n"); + platform_set_drvdata(pdev, tpm); - tpm->chip.dev = &pdev->dev; - tpm->chip.ops = &imx_tpm_pwm_ops; + tpm->base = base; + tpm->clk = clk; - /* get number of channels */ - val = readl(tpm->base + PWM_IMX_TPM_PARAM); - tpm->chip.npwm = FIELD_GET(PWM_IMX_TPM_PARAM_CHAN, val); + chip->ops = &imx_tpm_pwm_ops; mutex_init(&tpm->lock); - ret = devm_pwmchip_add(&pdev->dev, &tpm->chip); + ret = devm_pwmchip_add(&pdev->dev, chip); if (ret) return dev_err_probe(&pdev->dev, ret, "failed to add PWM chip\n"); @@ -374,6 +383,7 @@ static int pwm_imx_tpm_probe(struct platform_device *pdev) static int pwm_imx_tpm_suspend(struct device *dev) { struct imx_tpm_pwm_chip *tpm = dev_get_drvdata(dev); + int ret; if (tpm->enable_count > 0) return -EBUSY; @@ -387,7 +397,11 @@ static int pwm_imx_tpm_suspend(struct device *dev) clk_disable_unprepare(tpm->clk); - return 0; + ret = pinctrl_pm_select_sleep_state(dev); + if (ret) + clk_prepare_enable(tpm->clk); + + return ret; } static int pwm_imx_tpm_resume(struct device *dev) @@ -395,9 +409,15 @@ static int pwm_imx_tpm_resume(struct device *dev) struct imx_tpm_pwm_chip *tpm = dev_get_drvdata(dev); int ret = 0; - ret = clk_prepare_enable(tpm->clk); + ret = pinctrl_pm_select_default_state(dev); if (ret) + return ret; + + ret = clk_prepare_enable(tpm->clk); + if (ret) { dev_err(dev, "failed to prepare or enable clock: %d\n", ret); + pinctrl_pm_select_sleep_state(dev); + } return ret; } |