linux-kernel - [PATCH RFC v2 5/6] gpio: aggregator: add possibility to attach data to the forwarder

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Message-Id: <20250317-aaeon-up-board-pinctrl-support-v2-5-36126e30aa62@bootlin.com>
Date: Mon, 17 Mar 2025 16:38:03 +0100
From: Thomas Richard <thomas.richard@...tlin.com>
To: Linus Walleij <linus.walleij@...aro.org>, 
 Andy Shevchenko <andriy.shevchenko@...ux.intel.com>, 
 Bartosz Golaszewski <brgl@...ev.pl>, 
 Geert Uytterhoeven <geert+renesas@...der.be>
Cc: linux-gpio@...r.kernel.org, linux-kernel@...r.kernel.org, 
 thomas.petazzoni@...tlin.com, DanieleCleri@...on.eu, GaryWang@...on.com.tw, 
 Thomas Richard <thomas.richard@...tlin.com>
Subject: [PATCH RFC v2 5/6] gpio: aggregator: add possibility to attach
 data to the forwarder

Add a data pointer to store private data in the forwarder.

Signed-off-by: Thomas Richard <thomas.richard@...tlin.com>
---
 drivers/gpio/gpio-aggregator.c | 6 ++++--
 include/linux/gpio/gpio-fwd.h  | 3 ++-
 2 files changed, 6 insertions(+), 3 deletions(-)

diff --git a/drivers/gpio/gpio-aggregator.c b/drivers/gpio/gpio-aggregator.c
index b9026ff2bfdc1..3c78c47ce40ae 100644
--- a/drivers/gpio/gpio-aggregator.c
+++ b/drivers/gpio/gpio-aggregator.c
@@ -556,7 +556,7 @@ int gpiochip_fwd_add_gpio_desc(struct gpiochip_fwd *fwd, struct gpio_desc *desc,
 }
 EXPORT_SYMBOL_GPL(gpiochip_fwd_add_gpio_desc);
 
-int gpiochip_fwd_register(struct gpiochip_fwd *fwd)
+int gpiochip_fwd_register(struct gpiochip_fwd *fwd, void *data)
 {
 	struct gpio_chip *chip = &fwd->chip;
 	struct device *dev = fwd->dev;
@@ -579,6 +579,8 @@ int gpiochip_fwd_register(struct gpiochip_fwd *fwd)
 	else
 		spin_lock_init(&fwd->slock);
 
+	fwd->data = data;
+
 	error = devm_gpiochip_add_data(dev, chip, fwd);
 
 	return error;
@@ -625,7 +627,7 @@ static struct gpiochip_fwd *gpiochip_fwd_create(struct device *dev,
 			return ERR_PTR(error);
 	}
 
-	error = gpiochip_fwd_register(fwd);
+	error = gpiochip_fwd_register(fwd, NULL);
 	if (error)
 		return ERR_PTR(error);
 
diff --git a/include/linux/gpio/gpio-fwd.h b/include/linux/gpio/gpio-fwd.h
index 80ec34ee282fc..c242cc1888180 100644
--- a/include/linux/gpio/gpio-fwd.h
+++ b/include/linux/gpio/gpio-fwd.h
@@ -10,6 +10,7 @@ struct gpiochip_fwd_timing {
 struct gpiochip_fwd {
 	struct device *dev;
 	struct gpio_chip chip;
+	void *data;
 	struct gpio_desc **descs;
 	union {
 		struct mutex mlock;	/* protects tmp[] if can_sleep */
@@ -50,6 +51,6 @@ int gpiochip_fwd_add_gpio_desc(struct gpiochip_fwd *fwd,
 			       struct gpio_desc *desc,
 			       unsigned int offset);
 
-int gpiochip_fwd_register(struct gpiochip_fwd *fwd);
+int gpiochip_fwd_register(struct gpiochip_fwd *fwd, void *data);
 
 #endif

-- 
2.39.5