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authorTony Lindgren <tony@atomide.com>2017-01-12 01:13:34 +0300
committerLinus Walleij <linus.walleij@linaro.org>2017-01-13 18:25:17 +0300
commit950b0d91dc108f54bccca5a2f75bb46f2df63d29 (patch)
tree305daab89f93b16951c6a53efc9bb002eacdefc9 /drivers/pinctrl/pinctrl-single.c
parent56d9e4a76039afd504919cc5ec329fb0ce35812f (diff)
downloadlinux-950b0d91dc108f54bccca5a2f75bb46f2df63d29.tar.xz
pinctrl: core: Fix regression caused by delayed work for hogs
Commit df61b366af26 ("pinctrl: core: Use delayed work for hogs") caused a regression at least with sh-pfc that is also a GPIO controller as noted by Geert Uytterhoeven <geert@linux-m68k.org>. As the original pinctrl_register() has issues calling pin controller driver functions early before the controller has finished registering, we can't just revert commit df61b366af26. That would break the drivers using GENERIC_PINCTRL_GROUPS or GENERIC_PINMUX_FUNCTIONS. So let's fix the issue with the following steps as a single patch: 1. Revert the late_init parts of commit df61b366af26. The late_init clearly won't work and we have to just give up on fixing pinctrl_register() for GENERIC_PINCTRL_GROUPS and GENERIC_PINMUX_FUNCTIONS. 2. Split pinctrl_register() into two parts By splitting pinctrl_register() into pinctrl_init_controller() and pinctrl_create_and_start() we have better control over when it's safe to call pinctrl_create(). 3. Introduce a new pinctrl_register_and_init() function As suggested by Linus Walleij <linus.walleij@linaro.org>, we can just introduce a new function for the controllers that need pinctrl_create() called later. 4. Convert the four known problem cases to use new function Let's convert pinctrl-imx, pinctrl-single, sh-pfc and ti-iodelay to use the new function to fix the issues. The rest of the drivers can be converted later. Let's also update Documentation/pinctrl.txt accordingly because of the known issues with pinctrl_register(). Fixes: df61b366af26 ("pinctrl: core: Use delayed work for hogs") Reported-by: Geert Uytterhoeven <geert@linux-m68k.org> Cc: Gary Bisson <gary.bisson@boundarydevices.com> Signed-off-by: Tony Lindgren <tony@atomide.com> Tested-by: Geert Uytterhoeven <geert+renesas@glider.be> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Diffstat (limited to 'drivers/pinctrl/pinctrl-single.c')
-rw-r--r--drivers/pinctrl/pinctrl-single.c5
1 files changed, 2 insertions, 3 deletions
diff --git a/drivers/pinctrl/pinctrl-single.c b/drivers/pinctrl/pinctrl-single.c
index 8408263de466..d23e0e0aeb22 100644
--- a/drivers/pinctrl/pinctrl-single.c
+++ b/drivers/pinctrl/pinctrl-single.c
@@ -1747,10 +1747,9 @@ static int pcs_probe(struct platform_device *pdev)
if (ret < 0)
goto free;
- pcs->pctl = pinctrl_register(&pcs->desc, pcs->dev, pcs);
- if (IS_ERR(pcs->pctl)) {
+ ret = pinctrl_register_and_init(&pcs->desc, pcs->dev, pcs, &pcs->pctl);
+ if (ret) {
dev_err(pcs->dev, "could not register single pinctrl driver\n");
- ret = PTR_ERR(pcs->pctl);
goto free;
}