[PATCH 01/12] gpio: mmio: use new GPIO line value setter callbacks

From: Bartosz Golaszewski <brgl@bgdev.pl>
To: "Linus Walleij" <linus.walleij@linaro.org>,
	"Bartosz Golaszewski" <brgl@bgdev.pl>,
	"Marek Behún" <kabel@kernel.org>,
	"Conor Dooley" <conor.dooley@microchip.com>,
	"Daire McNamara" <daire.mcnamara@microchip.com>,
	"Daniel Palmer" <daniel@thingy.jp>,
	"Romain Perier" <romain.perier@gmail.com>,
	"Avi Fishman" <avifishman70@gmail.com>,
	"Tomer Maimon" <tmaimon77@gmail.com>,
	"Tali Perry" <tali.perry1@gmail.com>,
	"Patrick Venture" <venture@google.com>,
	"Nancy Yuen" <yuenn@google.com>,
	"Benjamin Fair" <benjaminfair@google.com>,
	"Grygorii Strashko" <grygorii.strashko@ti.com>,
	"Santosh Shilimkar" <ssantosh@kernel.org>,
	"Kevin Hilman" <khilman@kernel.org>
Cc: linux-gpio@vger.kernel.org, linux-kernel@vger.kernel.org,
	 linux-riscv@lists.infradead.org,
	linux-arm-kernel@lists.infradead.org,  openbmc@lists.ozlabs.org,
	linux-omap@vger.kernel.org,
	 Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
Subject: [PATCH 01/12] gpio: mmio: use new GPIO line value setter callbacks
Date: Tue, 10 Jun 2025 14:33:11 +0200	[thread overview]
Message-ID: <20250610-gpiochip-set-rv-gpio-v1-1-3a9a3c1472ff@linaro.org> (raw)
In-Reply-To: <20250610-gpiochip-set-rv-gpio-v1-0-3a9a3c1472ff@linaro.org>

From: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>

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

Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
---
 drivers/gpio/gpio-mmio.c | 53 ++++++++++++++++++++++++++++++------------------
 1 file changed, 33 insertions(+), 20 deletions(-)

diff --git a/drivers/gpio/gpio-mmio.c b/drivers/gpio/gpio-mmio.c
index 4841e4ebe7a67d0f954e9a6f995ec5758f124edd..9169eccadb238efe944d494054b1e009f16eee7f 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);
 

-- 
2.48.1


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