target/linux/bcm27xx/patches-5.4/950-0113-Add-ability-to-export-gpio-used-by-gpio-poweroff.patch

   1 From 4c957b11a439d372c26d5f90ef81ec52d1839a0c Mon Sep 17 00:00:00 2001
   2 From: Nick Bulleid <nedbulleid@fastmail.com>
   3 Date: Thu, 10 May 2018 21:57:02 +0100
   4 Subject: [PATCH] Add ability to export gpio used by gpio-poweroff
   5
   6 Signed-off-by: Nick Bulleid <nedbulleid@fastmail.com>
   7
   8 Added export feature to gpio-poweroff documentation
   9
  10 Signed-off-by: Nick Bulleid <nedbulleid@fastmail.com>
  11 ---
  12  .../devicetree/bindings/power/reset/gpio-poweroff.txt    | 1 +
  13  drivers/power/reset/gpio-poweroff.c                      | 9 +++++++++
  14  2 files changed, 10 insertions(+)
  15
  16 --- a/Documentation/devicetree/bindings/power/reset/gpio-poweroff.txt
  17 +++ b/Documentation/devicetree/bindings/power/reset/gpio-poweroff.txt
  18 @@ -31,6 +31,7 @@ Optional properties:
  19  - inactive-delay-ms: Delay (default 100) to wait after driving gpio inactive
  20  - timeout-ms: Time to wait before asserting a WARN_ON(1). If nothing is
  21                specified, 3000 ms is used.
  22 +- export : Export the GPIO line to the sysfs system
  23
  24  Examples:
  25
  26 --- a/drivers/power/reset/gpio-poweroff.c
  27 +++ b/drivers/power/reset/gpio-poweroff.c
  28 @@ -51,6 +51,7 @@ static int gpio_poweroff_probe(struct pl
  29         bool input = false;
  30         enum gpiod_flags flags;
  31         bool force = false;
  32 +       bool export = false;
  33
  34         /* If a pm_power_off function has already been added, leave it alone */
  35         force = of_property_read_bool(pdev->dev.of_node, "force");
  36 @@ -76,6 +77,12 @@ static int gpio_poweroff_probe(struct pl
  37         if (IS_ERR(reset_gpio))
  38                 return PTR_ERR(reset_gpio);
  39
  40 +       export = of_property_read_bool(pdev->dev.of_node, "export");
  41 +       if (export) {
  42 +               gpiod_export(reset_gpio, false);
  43 +               gpiod_export_link(&pdev->dev, "poweroff-gpio", reset_gpio);
  44 +       }
  45 +
  46         pm_power_off = &gpio_poweroff_do_poweroff;
  47         return 0;
  48  }
  49 @@ -85,6 +92,8 @@ static int gpio_poweroff_remove(struct p
  50         if (pm_power_off == &gpio_poweroff_do_poweroff)
  51                 pm_power_off = NULL;
  52
  53 +       gpiod_unexport(reset_gpio);
  54 +
  55         return 0;
  56  }
  57