linux-kernel - [PATCH v2 07/14] gpiolib: Export symbol gpiochip_set

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Message-ID: <c9a7d48fefd310941330a4c9892f7218b235e0c5.1728300189.git.andrea.porta@suse.com>
Date: Mon,  7 Oct 2024 14:39:50 +0200
From: Andrea della Porta <andrea.porta@...e.com>
To: Andrea della Porta <andrea.porta@...e.com>,
	Michael Turquette <mturquette@...libre.com>,
	Stephen Boyd <sboyd@...nel.org>,
	Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Florian Fainelli <florian.fainelli@...adcom.com>,
	Broadcom internal kernel review list <bcm-kernel-feedback-list@...adcom.com>,
	Lorenzo Pieralisi <lpieralisi@...nel.org>,
	Krzysztof Wilczyński <kw@...ux.com>,
	Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	Linus Walleij <linus.walleij@...aro.org>,
	Catalin Marinas <catalin.marinas@....com>,
	Will Deacon <will@...nel.org>,
	Bartosz Golaszewski <brgl@...ev.pl>,
	Derek Kiernan <derek.kiernan@....com>,
	Dragan Cvetic <dragan.cvetic@....com>,
	Arnd Bergmann <arnd@...db.de>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Saravana Kannan <saravanak@...gle.com>,
	linux-clk@...r.kernel.org,
	devicetree@...r.kernel.org,
	linux-rpi-kernel@...ts.infradead.org,
	linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org,
	linux-pci@...r.kernel.org,
	linux-gpio@...r.kernel.org,
	Masahiro Yamada <masahiroy@...nel.org>,
	Stefan Wahren <wahrenst@....net>,
	Herve Codina <herve.codina@...tlin.com>,
	Luca Ceresoli <luca.ceresoli@...tlin.com>,
	Thomas Petazzoni <thomas.petazzoni@...tlin.com>,
	Andrew Lunn <andrew@...n.ch>
Subject: [PATCH v2 07/14] gpiolib: Export symbol gpiochip_set_names()

Being able to assign gpio line names dynamically is a feature
that could be used by drivers that do not have the exact naming
(e.g. through the DTB/DTBO) at probing time.
An example of this is the RP1 driver that populates the DT
at late time through a DT overlay. In this case a custom overlay
can be loaded from userspace with the gpio line names.

Export gpiochip_set_names() to allow refreshing the gpio line
names from the driver module.

Signed-off-by: Andrea della Porta <andrea.porta@...e.com>
---
 drivers/gpio/gpiolib.c      | 3 ++-
 include/linux/gpio/driver.h | 3 +++
 2 files changed, 5 insertions(+), 1 deletion(-)

diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c
index c6afbf434366..a2aa3560094a 100644
--- a/drivers/gpio/gpiolib.c
+++ b/drivers/gpio/gpiolib.c
@@ -522,7 +522,7 @@ static void gpiochip_set_desc_names(struct gpio_chip *gc)
  * names belong to the underlying firmware node and should not be released
  * by the caller.
  */
-static int gpiochip_set_names(struct gpio_chip *chip)
+int gpiochip_set_names(struct gpio_chip *chip)
 {
 	struct gpio_device *gdev = chip->gpiodev;
 	struct device *dev = &gdev->dev;
@@ -589,6 +589,7 @@ static int gpiochip_set_names(struct gpio_chip *chip)
 
 	return 0;
 }
+EXPORT_SYMBOL(gpiochip_set_names);
 
 static unsigned long *gpiochip_allocate_mask(struct gpio_chip *gc)
 {
diff --git a/include/linux/gpio/driver.h b/include/linux/gpio/driver.h
index 2dd7cb9cc270..6e4cd7b7e47e 100644
--- a/include/linux/gpio/driver.h
+++ b/include/linux/gpio/driver.h
@@ -679,6 +679,9 @@ bool gpiochip_line_is_open_source(struct gpio_chip *gc, unsigned int offset);
 bool gpiochip_line_is_persistent(struct gpio_chip *gc, unsigned int offset);
 bool gpiochip_line_is_valid(const struct gpio_chip *gc, unsigned int offset);
 
+/* Assign gpio line names from device property */
+int gpiochip_set_names(struct gpio_chip *chip);
+
 /* get driver data */
 void *gpiochip_get_data(struct gpio_chip *gc);
 
-- 
2.35.3