target/linux/ar71xx/patches-4.14/442-leds-gpio-allow-to-use-OPEN_-DRAIN-SOURCE-flags-with.patch

   1 From 183148e0789bee1cd5c46ba49afcb211f636f8a2 Mon Sep 17 00:00:00 2001
   2 From: Gabor Juhos <juhosg@freemail.hu>
   3 Date: Mon, 15 Jan 2018 15:01:14 +0100
   4 Subject: [PATCH] leds: gpio: allow to use OPEN_{DRAIN,SOURCE} flags with
   5  legacy GPIOs
   6
   7 LEDs which are connected to open-source or open-drain type of GPIO lines
   8 can be used only, if those are defined via devicetree.
   9 Add two new fields to 'struct gpio_led' in order to make it possible to
  10 specify this type of GPIO lines to the leds-gpio driver via platform data.
  11 Also update the create_gpio_led() function to set the GPIOF_OPEN_DRAIN and
  12 GPIOF_OPEN_SOURCE flags for the given GPIO line.
  13
  14 Signed-off-by: Gabor Juhos <juhosg@freemail.hu>
  15 ---
  16  drivers/leds/leds-gpio.c | 6 ++++++
  17  include/linux/leds.h     | 2 ++
  18  2 files changed, 8 insertions(+)
  19
  20 --- a/drivers/leds/leds-gpio.c
  21 +++ b/drivers/leds/leds-gpio.c
  22 @@ -100,6 +100,12 @@ static int create_gpio_led(const struct
  23                 if (template->active_low)
  24                         flags |= GPIOF_ACTIVE_LOW;
  25
  26 +               if (template->open_drain)
  27 +                       flags |= GPIOF_OPEN_DRAIN;
  28 +
  29 +               if (template->open_source)
  30 +                       flags |= GPIOF_OPEN_SOURCE;
  31 +
  32                 ret = devm_gpio_request_one(parent, template->gpio, flags,
  33                                             template->name);
  34                 if (ret < 0)
  35 --- a/include/linux/leds.h
  36 +++ b/include/linux/leds.h
  37 @@ -395,6 +395,8 @@ struct gpio_led {
  38         unsigned        default_state : 2;
  39         unsigned        retain_state_shutdown : 1;
  40         /* default_state should be one of LEDS_GPIO_DEFSTATE_(ON|OFF|KEEP) */
  41 +       unsigned        open_drain : 1;
  42 +       unsigned        open_source : 1;
  43         struct gpio_desc *gpiod;
  44  };
  45  #define LEDS_GPIO_DEFSTATE_OFF         0