package/boot/uboot-d1/patches/0051-gpio-axp-Add-support-for-getting-the-pin-function.patch

   1 From 37e19d9b8a23c88413dd845dbb3dd58dd3636a6d Mon Sep 17 00:00:00 2001
   2 From: Samuel Holland <samuel@sholland.org>
   3 Date: Sat, 28 Aug 2021 00:36:33 -0500
   4 Subject: [PATCH 51/90] gpio: axp: Add support for getting the pin function
   5
   6 Implement the .get_function operation, so the gpio command can report
   7 the current function. Since the GPIOF_FUNC (versus GPIOF_UNUSED) mux
   8 values vary among the PMICs, report all non-GPIO mux values as UNKNOWN.
   9
  10 Signed-off-by: Samuel Holland <samuel@sholland.org>
  11 ---
  12  drivers/gpio/axp_gpio.c | 19 +++++++++++++++++++
  13  1 file changed, 19 insertions(+)
  14
  15 --- a/drivers/gpio/axp_gpio.c
  16 +++ b/drivers/gpio/axp_gpio.c
  17 @@ -39,6 +39,24 @@ static int axp_gpio_get_value(struct ude
  18         return !!(ret & BIT(desc->status_offset + pin));
  19  }
  20
  21 +static int axp_gpio_get_function(struct udevice *dev, unsigned pin)
  22 +{
  23 +       const struct axp_gpio_desc *desc = dev_get_priv(dev);
  24 +       int ret;
  25 +
  26 +       ret = pmic_reg_read(dev->parent, desc->pins[pin]);
  27 +       if (ret < 0)
  28 +               return ret;
  29 +
  30 +       ret &= AXP_GPIO_CTRL_MASK;
  31 +       if (ret == desc->input_mux)
  32 +               return GPIOF_INPUT;
  33 +       if (ret == AXP_GPIO_CTRL_OUTPUT_HIGH || ret == AXP_GPIO_CTRL_OUTPUT_LOW)
  34 +               return GPIOF_OUTPUT;
  35 +
  36 +       return GPIOF_UNKNOWN;
  37 +}
  38 +
  39  static int axp_gpio_set_flags(struct udevice *dev, unsigned pin, ulong flags)
  40  {
  41         const struct axp_gpio_desc *desc = dev_get_priv(dev);
  42 @@ -60,6 +78,7 @@ static int axp_gpio_set_flags(struct ude
  43
  44  static const struct dm_gpio_ops axp_gpio_ops = {
  45         .get_value              = axp_gpio_get_value,
  46 +       .get_function           = axp_gpio_get_function,
  47         .xlate                  = gpio_xlate_offs_flags,
  48         .set_flags              = axp_gpio_set_flags,
  49  };