target/linux/brcm2708/patches-4.9/950-0014-pinctrl-bcm2835-Return-pins-to-inputs-when-freed.patch

   1 From e64023aab5addf920379e9f919d7c5cd4c8d0981 Mon Sep 17 00:00:00 2001
   2 From: Phil Elwell <phil@raspberrypi.org>
   3 Date: Fri, 6 May 2016 12:32:47 +0100
   4 Subject: [PATCH] pinctrl-bcm2835: Return pins to inputs when freed
   5
   6 When dynamically unloading overlays, it is important that freed pins are
   7 restored to being inputs to prevent functions from being enabled in
   8 multiple places at once.
   9
  10 Signed-off-by: Phil Elwell <phil@raspberrypi.org>
  11 ---
  12  drivers/pinctrl/bcm/pinctrl-bcm2835.c | 11 +++++++++++
  13  1 file changed, 11 insertions(+)
  14
  15 --- a/drivers/pinctrl/bcm/pinctrl-bcm2835.c
  16 +++ b/drivers/pinctrl/bcm/pinctrl-bcm2835.c
  17 @@ -838,6 +838,16 @@ static const struct pinctrl_ops bcm2835_
  18         .dt_free_map = bcm2835_pctl_dt_free_map,
  19  };
  20
  21 +static int bcm2835_pmx_free(struct pinctrl_dev *pctldev,
  22 +               unsigned offset)
  23 +{
  24 +       struct bcm2835_pinctrl *pc = pinctrl_dev_get_drvdata(pctldev);
  25 +
  26 +       /* disable by setting to GPIO_IN */
  27 +       bcm2835_pinctrl_fsel_set(pc, offset, BCM2835_FSEL_GPIO_IN);
  28 +       return 0;
  29 +}
  30 +
  31  static int bcm2835_pmx_get_functions_count(struct pinctrl_dev *pctldev)
  32  {
  33         return BCM2835_FSEL_COUNT;
  34 @@ -897,6 +907,7 @@ static int bcm2835_pmx_gpio_set_directio
  35  }
  36
  37  static const struct pinmux_ops bcm2835_pmx_ops = {
  38 +       .free = bcm2835_pmx_free,
  39         .get_functions_count = bcm2835_pmx_get_functions_count,
  40         .get_function_name = bcm2835_pmx_get_function_name,
  41         .get_function_groups = bcm2835_pmx_get_function_groups,