diff options
Diffstat (limited to 'drivers/pwm')
| -rw-r--r-- | drivers/pwm/pwm-tiehrpwm.c | 42 |
1 files changed, 41 insertions, 1 deletions
diff --git a/drivers/pwm/pwm-tiehrpwm.c b/drivers/pwm/pwm-tiehrpwm.c index 565f96a..ee7a8b3 100644 --- a/drivers/pwm/pwm-tiehrpwm.c +++ b/drivers/pwm/pwm-tiehrpwm.c @@ -25,6 +25,9 @@ #include <linux/err.h> #include <linux/clk.h> #include <linux/pm_runtime.h> +#include <linux/of_device.h> + +#include "pwm-tipwmss.h" /* EHRPWM registers and bits definitions */ @@ -399,12 +402,19 @@ static const struct pwm_ops ehrpwm_pwm_ops = { .owner = THIS_MODULE, }; +static const struct of_device_id ehrpwm_of_match[] = { + { .compatible = "ti,am33xx-ehrpwm" }, + {}, +}; +MODULE_DEVICE_TABLE(of, ehrpwm_of_match); + static int __devinit ehrpwm_pwm_probe(struct platform_device *pdev) { int ret; struct resource *r; struct clk *clk; struct ehrpwm_pwm_chip *pc; + u16 status; pc = devm_kzalloc(&pdev->dev, sizeof(*pc), GFP_KERNEL); if (!pc) { @@ -426,6 +436,8 @@ static int __devinit ehrpwm_pwm_probe(struct platform_device *pdev) pc->chip.dev = &pdev->dev; pc->chip.ops = &ehrpwm_pwm_ops; + pc->chip.of_xlate = of_pwm_xlate_with_flags; + pc->chip.of_pwm_n_cells = 3; pc->chip.base = -1; pc->chip.npwm = NUM_PWM_CHANNEL; @@ -453,14 +465,40 @@ static int __devinit ehrpwm_pwm_probe(struct platform_device *pdev) } pm_runtime_enable(&pdev->dev); + pm_runtime_get_sync(&pdev->dev); + + status = pwmss_submodule_state_change(pdev->dev.parent, + PWMSS_EPWMCLK_EN); + if (!(status & PWMSS_EPWMCLK_EN_ACK)) { + dev_err(&pdev->dev, "PWMSS config space clock enable failed\n"); + ret = -EINVAL; + goto pwmss_clk_failure; + } + + pm_runtime_put_sync(&pdev->dev); + platform_set_drvdata(pdev, pc); return 0; + +pwmss_clk_failure: + pm_runtime_put_sync(&pdev->dev); + pm_runtime_disable(&pdev->dev); + pwmchip_remove(&pc->chip); + return ret; } static int __devexit ehrpwm_pwm_remove(struct platform_device *pdev) { struct ehrpwm_pwm_chip *pc = platform_get_drvdata(pdev); + pm_runtime_get_sync(&pdev->dev); + /* + * Due to hardware misbehaviour, acknowledge of the stop_req + * is missing. Hence checking of the status bit skipped. + */ + pwmss_submodule_state_change(pdev->dev.parent, PWMSS_EPWMCLK_STOP_REQ); + pm_runtime_put_sync(&pdev->dev); + pm_runtime_put_sync(&pdev->dev); pm_runtime_disable(&pdev->dev); return pwmchip_remove(&pc->chip); @@ -468,7 +506,9 @@ static int __devexit ehrpwm_pwm_remove(struct platform_device *pdev) static struct platform_driver ehrpwm_pwm_driver = { .driver = { - .name = "ehrpwm", + .name = "ehrpwm", + .owner = THIS_MODULE, + .of_match_table = ehrpwm_of_match, }, .probe = ehrpwm_pwm_probe, .remove = __devexit_p(ehrpwm_pwm_remove), |