-----Original Message----- From: Fabio Estevam [mailto:festevam@gmail.com] Sent: Friday, June 8, 2018 12:52 AM To: linus.walleij@linaro.org Cc: rf@opensource.cirrus.com; linux-gpio@vger.kernel.org; slongerbeam@gmail.com; shawnguo@kernel.org; kernel@pengutronix.de; dl-linux-imx linux-imx@nxp.com; mika.penttila@nextfour.com; Fabio Estevam fabio.estevam@nxp.com; stable@vger.kernel.org Subject: [PATCH] pinctrl: devicetree: Fix pctldev pointer overwrite
From: Fabio Estevam fabio.estevam@nxp.com
Commit b89405b6102f ("pinctrl: devicetree: Fix dt_to_map_one_config handling of hogs") causes the pinctrl hog pins to not get initialized on i.MX platforms leaving them with the IOMUX settings untouched.
This causes several regressions on i.MX such as:
- OV5640 camera driver can not be probed anymore on imx6qdl-sabresd
because the camera clock pin is in a pinctrl_hog group and since its pinctrl initialization is skipped, the camera clock is kept in GPIO functionality instead of CLK_CKO function.
- Audio stopped working on imx6qdl-wandboard and imx53-qsb for the same
reason.
Richard Fitzgerald explains the problem:
"I see the bug. If the hog node isn't a 1st level child of the pinctrl parent node it will go around the for(;;) loop again but on the first pass I overwrite pctldev with the result of get_pinctrl_dev_from_of_node() so it doesn't point to the pinctrl driver any more."
Fix the issue by stashing the original pctldev so it doesn't get overwritten.
Fixes: b89405b6102f ("pinctrl: devicetree: Fix dt_to_map_one_config handling of hogs") Cc: stable@vger.kernel.org Reported-by: Mika Penttilä mika.penttila@nextfour.com Reported-by: Steve Longerbeam slongerbeam@gmail.com Suggested-by: Richard Fitzgerald rf@opensource.cirrus.com Signed-off-by: Fabio Estevam fabio.estevam@nxp.com
Looks good to me.
Reviewed-by: Dong Aisheng aisheng.dong@nxp.com
Regards Dong Aisheng
drivers/pinctrl/devicetree.c | 7 +++++-- 1 file changed, 5 insertions(+), 2 deletions(-)
diff --git a/drivers/pinctrl/devicetree.c b/drivers/pinctrl/devicetree.c index b601039..c4aa411 100644 --- a/drivers/pinctrl/devicetree.c +++ b/drivers/pinctrl/devicetree.c @@ -101,10 +101,11 @@ struct pinctrl_dev *of_pinctrl_get(struct device_node *np) }
static int dt_to_map_one_config(struct pinctrl *p,
struct pinctrl_dev *pctldev,
struct pinctrl_dev *hog_pctldev, const char *statename, struct device_node *np_config){
- struct pinctrl_dev *pctldev = NULL; struct device_node *np_pctldev; const struct pinctrl_ops *ops; int ret;
@@ -123,8 +124,10 @@ static int dt_to_map_one_config(struct pinctrl *p, return -EPROBE_DEFER; } /* If we're creating a hog we can use the passed pctldev */
if (pctldev && (np_pctldev == p->dev->of_node))
if (hog_pctldev && (np_pctldev == p->dev->of_node)) {pctldev = hog_pctldev; break;}-- 2.7.4