target/linux/lantiq/patches-4.14/0002-gpio-stp-xway-Implement-get-callback.patch

   1 From 5b9b2b5284f81941972105b13337c58489ea8fca Mon Sep 17 00:00:00 2001
   2 From: Mathias Kresin <dev@kresin.me>
   3 Date: Thu, 28 Jun 2018 21:57:40 +0200
   4 Subject: [PATCH] gpio: stp-xway: Implement get callback
   5
   6 Add an implementation to get the current GPIO state.
   7
   8 The callback is used by the leds-gpio driver for example, in case the
   9 current LED/GPIO state should be kept during driver load.
  10
  11 Signed-off-by: Mathias Kresin <dev@kresin.me>
  12 Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
  13 ---
  14  drivers/gpio/gpio-stp-xway.c | 15 +++++++++++++++
  15  1 file changed, 15 insertions(+)
  16
  17 --- a/drivers/gpio/gpio-stp-xway.c
  18 +++ b/drivers/gpio/gpio-stp-xway.c
  19 @@ -91,6 +91,20 @@ struct xway_stp {
  20  };
  21
  22  /**
  23 + * xway_stp_get() - gpio_chip->get - get gpios.
  24 + * @gc:     Pointer to gpio_chip device structure.
  25 + * @gpio:   GPIO signal number.
  26 + *
  27 + * Gets the shadow value.
  28 + */
  29 +static int xway_stp_get(struct gpio_chip *gc, unsigned int gpio)
  30 +{
  31 +       struct xway_stp *chip = gpiochip_get_data(gc);
  32 +
  33 +       return (xway_stp_r32(chip->virt, XWAY_STP_CPU0) & BIT(gpio));
  34 +}
  35 +
  36 +/**
  37   * xway_stp_set() - gpio_chip->set - set gpios.
  38   * @gc:     Pointer to gpio_chip device structure.
  39   * @gpio:   GPIO signal number.
  40 @@ -215,6 +229,7 @@ static int xway_stp_probe(struct platfor
  41         chip->gc.parent = &pdev->dev;
  42         chip->gc.label = "stp-xway";
  43         chip->gc.direction_output = xway_stp_dir_out;
  44 +       chip->gc.get = xway_stp_get;
  45         chip->gc.set = xway_stp_set;
  46         chip->gc.request = xway_stp_request;
  47         chip->gc.base = -1;