gpio: add ops to set dir flags

Add the ops for GPIO driver set_dir_flags() to set the dir flags.
The user can update the direction and configuration
of each GPIO with a only call to dm_gpio_set_dir_flags() or
dm_gpio_set_dir() and respecting the configuration provided by
device tree (saved in desc->flags).

When these optional ops are absent, the gpio uclass use the mandatory
ops (direction_output, direction_input, get_value) and desc->flags
to manage only the main dir flags:
- GPIOD_IS_IN
- GPIOD_IS_OUT
- GPIOD_IS_OUT_ACTIVE
- GPIOD_ACTIVE_LOW

Signed-off-by: Patrick Delaunay <patrick.delaunay@st.com>
Reviewed-by: Simon Glass <sjg@chromium.org>

diff --git a/drivers/gpio/gpio-uclass.c b/drivers/gpio/gpio-uclass.c
index 84e5013..757ab71 100644 (file)
--- a/drivers/gpio/gpio-uclass.c
+++ b/drivers/gpio/gpio-uclass.c
@@ -572,11 +572,16 @@ static int _dm_gpio_set_dir_flags(struct gpio_desc *desc, ulong flags)
                return ret;
        }
 
-       if (flags & GPIOD_IS_OUT) {
-               ret = ops->direction_output(dev, desc->offset,
-                                           GPIOD_FLAGS_OUTPUT(flags));
-       } else if (flags & GPIOD_IS_IN) {
-               ret = ops->direction_input(dev, desc->offset);
+       /* GPIOD_ are directly managed by driver in set_dir_flags*/
+       if (ops->set_dir_flags) {
+               ret = ops->set_dir_flags(dev, desc->offset, flags);
+       } else {
+               if (flags & GPIOD_IS_OUT) {
+                       ret = ops->direction_output(dev, desc->offset,
+                                                   GPIOD_FLAGS_OUTPUT(flags));
+               } else if (flags & GPIOD_IS_IN) {
+                       ret = ops->direction_input(dev, desc->offset);
+               }
        }
 
        return ret;
@@ -1146,6 +1151,8 @@ static int gpio_post_bind(struct udevice *dev)
                        ops->get_function += gd->reloc_off;
                if (ops->xlate)
                        ops->xlate += gd->reloc_off;
+               if (ops->set_dir_flags)
+                       ops->set_dir_flags += gd->reloc_off;
                if (ops->get_dir_flags)
                        ops->get_dir_flags += gd->reloc_off;
 

diff --git a/include/asm-generic/gpio.h b/include/asm-generic/gpio.h
index 7c1f71b..859f41a 100644 (file)
--- a/include/asm-generic/gpio.h
+++ b/include/asm-generic/gpio.h
@@ -298,6 +298,22 @@ struct dm_gpio_ops {
        int (*xlate)(struct udevice *dev, struct gpio_desc *desc,
                     struct ofnode_phandle_args *args);
 
+       /**
+        * set_dir_flags() - Set GPIO dir flags
+        *
+        * This function should set up the GPIO configuration according to the
+        * information provide by the direction flags bitfield.
+        *
+        * This method is optional.
+        *
+        * @dev:        GPIO device
+        * @offset:     GPIO offset within that device
+        * @flags:      GPIO configuration to use
+        * @return 0 if OK, -ve on error
+        */
+       int (*set_dir_flags)(struct udevice *dev, unsigned int offset,
+                            ulong flags);
+
        /**
         * get_dir_flags() - Get GPIO dir flags
         *