[PATCH v3 15/21] gpio: add ops to set dir flags

[Patrick Delaunay]

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 at st.com>
---

This patch was part of v2 08/14
= gpio: add ops for configuration with dir flags


Changes in v3:
- Split the previous patch [PATCH v2 08/14] to help review

Changes in v2:
- change the proposed ops for pin config to set_dir_flags/get_dir_flags
- reused the existing API dm_gpio_set_dir_flags/dm_gpio_set_dir
- add a new API dm_gpio_get_dir_flags

 drivers/gpio/gpio-uclass.c | 17 ++++++++++++-----
 include/asm-generic/gpio.h | 16 ++++++++++++++++
 2 files changed, 28 insertions(+), 5 deletions(-)

diff --git a/drivers/gpio/gpio-uclass.c b/drivers/gpio/gpio-uclass.c
index 89af37a4ea..5da28e6ed9 100644
--- a/drivers/gpio/gpio-uclass.c
+++ b/drivers/gpio/gpio-uclass.c
@@ -571,11 +571,16 @@ 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;
@@ -1145,6 +1150,8 @@ 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 ac30c3ee4e..ec4877037a 100644
--- 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
 	 *
-- 
2.17.1