gpio: mmio: use new GPIO line value setter callbacks

struct gpio_chip now has callbacks for setting line values that return
an integer, allowing to indicate failures. Convert the driver to using
them.

Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Link: https://lore.kernel.org/r/20250610-gpiochip-set-rv-gpio-v1-1-3a9a3c1472ff@linaro.org
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>

1 files changed, 33 insertions, 20 deletions

diff --git a/drivers/gpio/gpio-mmio.c b/drivers/gpio/gpio-mmio.c
index 4841e4ebe7a6..9169eccadb23 100644
--- a/drivers/gpio/gpio-mmio.c
+++ b/drivers/gpio/gpio-mmio.c
@@ -211,11 +211,12 @@ static int bgpio_get_multiple_be(struct gpio_chip *gc, unsigned long *mask,
 	return 0;
 }
 
-static void bgpio_set_none(struct gpio_chip *gc, unsigned int gpio, int val)
+static int bgpio_set_none(struct gpio_chip *gc, unsigned int gpio, int val)
 {
+	return 0;
 }
 
-static void bgpio_set(struct gpio_chip *gc, unsigned int gpio, int val)
+static int bgpio_set(struct gpio_chip *gc, unsigned int gpio, int val)
 {
 	unsigned long mask = bgpio_line2mask(gc, gpio);
 	unsigned long flags;
@@ -230,10 +231,12 @@ static void bgpio_set(struct gpio_chip *gc, unsigned int gpio, int val)
 	gc->write_reg(gc->reg_dat, gc->bgpio_data);
 
 	raw_spin_unlock_irqrestore(&gc->bgpio_lock, flags);
+
+	return 0;
 }
 
-static void bgpio_set_with_clear(struct gpio_chip *gc, unsigned int gpio,
-				 int val)
+static int bgpio_set_with_clear(struct gpio_chip *gc, unsigned int gpio,
+				int val)
 {
 	unsigned long mask = bgpio_line2mask(gc, gpio);
 
@@ -241,9 +244,11 @@ static void bgpio_set_with_clear(struct gpio_chip *gc, unsigned int gpio,
 		gc->write_reg(gc->reg_set, mask);
 	else
 		gc->write_reg(gc->reg_clr, mask);
+
+	return 0;
 }
 
-static void bgpio_set_set(struct gpio_chip *gc, unsigned int gpio, int val)
+static int bgpio_set_set(struct gpio_chip *gc, unsigned int gpio, int val)
 {
 	unsigned long mask = bgpio_line2mask(gc, gpio);
 	unsigned long flags;
@@ -258,6 +263,8 @@ static void bgpio_set_set(struct gpio_chip *gc, unsigned int gpio, int val)
 	gc->write_reg(gc->reg_set, gc->bgpio_data);
 
 	raw_spin_unlock_irqrestore(&gc->bgpio_lock, flags);
+
+	return 0;
 }
 
 static void bgpio_multiple_get_masks(struct gpio_chip *gc,
@@ -298,21 +305,25 @@ static void bgpio_set_multiple_single_reg(struct gpio_chip *gc,
 	raw_spin_unlock_irqrestore(&gc->bgpio_lock, flags);
 }
 
-static void bgpio_set_multiple(struct gpio_chip *gc, unsigned long *mask,
+static int bgpio_set_multiple(struct gpio_chip *gc, unsigned long *mask,
 			       unsigned long *bits)
 {
 	bgpio_set_multiple_single_reg(gc, mask, bits, gc->reg_dat);
+
+	return 0;
 }
 
-static void bgpio_set_multiple_set(struct gpio_chip *gc, unsigned long *mask,
-				   unsigned long *bits)
+static int bgpio_set_multiple_set(struct gpio_chip *gc, unsigned long *mask,
+				  unsigned long *bits)
 {
 	bgpio_set_multiple_single_reg(gc, mask, bits, gc->reg_set);
+
+	return 0;
 }
 
-static void bgpio_set_multiple_with_clear(struct gpio_chip *gc,
-					  unsigned long *mask,
-					  unsigned long *bits)
+static int bgpio_set_multiple_with_clear(struct gpio_chip *gc,
+					 unsigned long *mask,
+					 unsigned long *bits)
 {
 	unsigned long set_mask, clear_mask;
 
@@ -322,6 +333,8 @@ static void bgpio_set_multiple_with_clear(struct gpio_chip *gc,
 		gc->write_reg(gc->reg_set, set_mask);
 	if (clear_mask)
 		gc->write_reg(gc->reg_clr, clear_mask);
+
+	return 0;
 }
 
 static int bgpio_dir_return(struct gpio_chip *gc, unsigned int gpio, bool dir_out)
@@ -510,18 +523,18 @@ static int bgpio_setup_io(struct gpio_chip *gc,
 	if (set && clr) {
 		gc->reg_set = set;
 		gc->reg_clr = clr;
-		gc->set = bgpio_set_with_clear;
-		gc->set_multiple = bgpio_set_multiple_with_clear;
+		gc->set_rv = bgpio_set_with_clear;
+		gc->set_multiple_rv = bgpio_set_multiple_with_clear;
 	} else if (set && !clr) {
 		gc->reg_set = set;
-		gc->set = bgpio_set_set;
-		gc->set_multiple = bgpio_set_multiple_set;
+		gc->set_rv = bgpio_set_set;
+		gc->set_multiple_rv = bgpio_set_multiple_set;
 	} else if (flags & BGPIOF_NO_OUTPUT) {
-		gc->set = bgpio_set_none;
-		gc->set_multiple = NULL;
+		gc->set_rv = bgpio_set_none;
+		gc->set_multiple_rv = NULL;
 	} else {
-		gc->set = bgpio_set;
-		gc->set_multiple = bgpio_set_multiple;
+		gc->set_rv = bgpio_set;
+		gc->set_multiple_rv = bgpio_set_multiple;
 	}
 
 	if (!(flags & BGPIOF_UNREADABLE_REG_SET) &&
@@ -654,7 +667,7 @@ int bgpio_init(struct gpio_chip *gc, struct device *dev,
 	}
 
 	gc->bgpio_data = gc->read_reg(gc->reg_dat);
-	if (gc->set == bgpio_set_set &&
+	if (gc->set_rv == bgpio_set_set &&
 			!(flags & BGPIOF_UNREADABLE_REG_SET))
 		gc->bgpio_data = gc->read_reg(gc->reg_set);