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| author | Linus Walleij <linus.walleij@linaro.org> | 2016-12-30 16:44:18 +0300 |
|---|---|---|
| committer | Linus Walleij <linus.walleij@linaro.org> | 2017-01-03 11:26:17 +0300 |
| commit | 2d22e5b006d1c37dc4df012bd13b75e581fa6aa2 (patch) | |
| tree | 3d4836d583c4ef1c38e62091a090fd2b54cad0aa /drivers/pinctrl/core.c | |
| parent | 99e4f67508e1dd51e21ebae2150c6e4f4eae068b (diff) | |
| download | linux-2d22e5b006d1c37dc4df012bd13b75e581fa6aa2.tar.xz | |
pinctrl: add some comments to the hog/late init code
It confused me a bit so it may confuse others. Make it crystal
clear what is going on here for any future readers.
Cc: Tony Lindgren <tony@atomide.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Diffstat (limited to 'drivers/pinctrl/core.c')
| -rw-r--r-- | drivers/pinctrl/core.c | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/drivers/pinctrl/core.c b/drivers/pinctrl/core.c index d02e8def9506..a9e3a75fb67d 100644 --- a/drivers/pinctrl/core.c +++ b/drivers/pinctrl/core.c @@ -1753,6 +1753,12 @@ static void pinctrl_late_init(struct work_struct *work) pctldev = container_of(work, struct pinctrl_dev, late_init.work); + /* + * If the pin controller does NOT have hogs, this will report an + * error and we skip over this entire branch. This is why we can + * call this function directly when we do not have hogs on the + * device. + */ pctldev->p = create_pinctrl(pctldev->dev, pctldev); if (!IS_ERR(pctldev->p)) { kref_get(&pctldev->p->users); @@ -1847,6 +1853,12 @@ struct pinctrl_dev *pinctrl_register(struct pinctrl_desc *pctldesc, goto out_err; } + /* + * If the device has hogs we want the probe() function of the driver + * to complete before we go in and hog them and add the pin controller + * to the list of controllers. If it has no hogs, we can just complete + * the registration immediately. + */ if (pinctrl_dt_has_hogs(pctldev)) schedule_delayed_work(&pctldev->late_init, 0); else |