linux-kernel - [PATCH v6 10/12] gpio: aggregator: add possibility to attach data to the forwarder

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Message-Id: <20250520-aaeon-up-board-pinctrl-support-v6-10-dcb3756be3c6@bootlin.com>
Date: Tue, 20 May 2025 15:28:34 +0200
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>, Kees Cook <kees@...nel.org>, 
 Andy Shevchenko <andy@...nel.org>
Cc: linux-gpio@...r.kernel.org, linux-kernel@...r.kernel.org, 
 thomas.petazzoni@...tlin.com, DanieleCleri@...on.eu, GaryWang@...on.com.tw, 
 linux-hardening@...r.kernel.org, 
 Thomas Richard <thomas.richard@...tlin.com>
Subject: [PATCH v6 10/12] gpio: aggregator: add possibility to attach data
 to the forwarder

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

Reviewed-by: Andy Shevchenko <andy@...nel.org>
Reviewed-by: Geert Uytterhoeven <geert+renesas@...der.be>
Signed-off-by: Thomas Richard <thomas.richard@...tlin.com>
---
 drivers/gpio/gpio-aggregator.c | 20 ++++++++++++++++++--
 include/linux/gpio/forwarder.h |  4 +++-
 2 files changed, 21 insertions(+), 3 deletions(-)

diff --git a/drivers/gpio/gpio-aggregator.c b/drivers/gpio/gpio-aggregator.c
index 8901d2c000ed..c0d7ec39c888 100644
--- a/drivers/gpio/gpio-aggregator.c
+++ b/drivers/gpio/gpio-aggregator.c
@@ -268,6 +268,7 @@ struct gpiochip_fwd {
 		spinlock_t slock;	/* protects tmp[] if !can_sleep */
 	};
 	struct gpiochip_fwd_timing *delay_timings;
+	void *data;
 	unsigned long *valid_mask;
 	unsigned long tmp[];		/* values and descs for multiple ops */
 };
@@ -526,6 +527,18 @@ struct gpio_chip *gpiochip_fwd_get_gpiochip(struct gpiochip_fwd *fwd)
 }
 EXPORT_SYMBOL_NS_GPL(gpiochip_fwd_get_gpiochip, "GPIO_FORWARDER");
 
+/**
+ * gpiochip_fwd_get_data - Get driver-private data for the GPIO forwarder
+ * @fwd: GPIO forwarder
+ *
+ * Returns: The driver-private data for the GPIO forwarder
+ */
+void *gpiochip_fwd_get_data(struct gpiochip_fwd *fwd)
+{
+	return fwd->data;
+}
+EXPORT_SYMBOL_NS_GPL(gpiochip_fwd_get_data, "GPIO_FORWARDER");
+
 /**
  * gpiochip_fwd_gpio_request - Request a line of the GPIO forwarder
  * @fwd: GPIO forwarder
@@ -790,10 +803,11 @@ EXPORT_SYMBOL_NS_GPL(gpiochip_fwd_desc_free, "GPIO_FORWARDER");
 /**
  * gpiochip_fwd_register - Register a GPIO forwarder
  * @fwd: GPIO forwarder
+ * @data: driver-private data associated with this forwarder
  *
  * Returns: 0 on success, or negative errno on failure.
  */
-int gpiochip_fwd_register(struct gpiochip_fwd *fwd)
+int gpiochip_fwd_register(struct gpiochip_fwd *fwd, void *data)
 {
 	struct gpio_chip *chip = &fwd->chip;
 
@@ -809,6 +823,8 @@ int gpiochip_fwd_register(struct gpiochip_fwd *fwd)
 	else
 		spin_lock_init(&fwd->slock);
 
+	fwd->data = data;
+
 	return devm_gpiochip_add_data(chip->parent, chip, fwd);
 }
 EXPORT_SYMBOL_NS_GPL(gpiochip_fwd_register, "GPIO_FORWARDER");
@@ -853,7 +869,7 @@ 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/forwarder.h b/include/linux/gpio/forwarder.h
index 45e0190308f0..ee5d8355f735 100644
--- a/include/linux/gpio/forwarder.h
+++ b/include/linux/gpio/forwarder.h
@@ -11,10 +11,12 @@ struct gpiochip_fwd *devm_gpiochip_fwd_alloc(struct device *dev,
 int gpiochip_fwd_desc_add(struct gpiochip_fwd *fwd,
 			  struct gpio_desc *desc, unsigned int offset);
 void gpiochip_fwd_desc_free(struct gpiochip_fwd *fwd, unsigned int offset);
-int gpiochip_fwd_register(struct gpiochip_fwd *fwd);
+int gpiochip_fwd_register(struct gpiochip_fwd *fwd, void *data);
 
 struct gpio_chip *gpiochip_fwd_get_gpiochip(struct gpiochip_fwd *fwd);
 
+void *gpiochip_fwd_get_data(struct gpiochip_fwd *fwd);
+
 int gpiochip_fwd_gpio_request(struct gpiochip_fwd *fwd, unsigned int offset);
 int gpiochip_fwd_gpio_get_direction(struct gpiochip_fwd *fwd,
 				    unsigned int offset);

-- 
2.39.5