linux-kernel - [PATCH 3/3] gpiolib: unexport devprop_gpiochip_set

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Message-Id: <20200908125813.8809-4-brgl@bgdev.pl>
Date:   Tue,  8 Sep 2020 14:58:13 +0200
From:   Bartosz Golaszewski <brgl@...ev.pl>
To:     Linus Walleij <linus.walleij@...aro.org>,
        Mika Westerberg <mika.westerberg@...ux.intel.com>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Kent Gibson <warthog618@...il.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     linux-gpio@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-acpi@...r.kernel.org,
        Bartosz Golaszewski <bgolaszewski@...libre.com>
Subject: [PATCH 3/3] gpiolib: unexport devprop_gpiochip_set_names()

From: Bartosz Golaszewski <bgolaszewski@...libre.com>

Now that devprop_gpiochip_set_names() is only used in a single place
inside drivers/gpio/gpiolib.c, there's no need anymore for it to be
exported or to even live in its own source file. Pull this function into
the core source file for gpiolib.

Signed-off-by: Bartosz Golaszewski <bgolaszewski@...libre.com>
---
 drivers/gpio/Makefile       |  1 -
 drivers/gpio/gpiolib.c      | 47 +++++++++++++++++++++++++++++++++++++
 include/linux/gpio/driver.h |  2 --
 3 files changed, 47 insertions(+), 3 deletions(-)

diff --git a/drivers/gpio/Makefile b/drivers/gpio/Makefile
index 4f9abff4f2dc..639275eb4e4d 100644
--- a/drivers/gpio/Makefile
+++ b/drivers/gpio/Makefile
@@ -6,7 +6,6 @@ ccflags-$(CONFIG_DEBUG_GPIO)	+= -DDEBUG
 obj-$(CONFIG_GPIOLIB)		+= gpiolib.o
 obj-$(CONFIG_GPIOLIB)		+= gpiolib-devres.o
 obj-$(CONFIG_GPIOLIB)		+= gpiolib-legacy.o
-obj-$(CONFIG_GPIOLIB)		+= gpiolib-devprop.o
 obj-$(CONFIG_GPIOLIB)		+= gpiolib-cdev.o
 obj-$(CONFIG_OF_GPIO)		+= gpiolib-of.o
 obj-$(CONFIG_GPIO_SYSFS)	+= gpiolib-sysfs.o
diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c
index 0d390f0ec32c..2b2526c5de51 100644
--- a/drivers/gpio/gpiolib.c
+++ b/drivers/gpio/gpiolib.c
@@ -358,6 +358,53 @@ static int gpiochip_set_desc_names(struct gpio_chip *gc)
 	return 0;
 }
 
+/*
+ * devprop_gpiochip_set_names - Set GPIO line names using device properties
+ * @chip: GPIO chip whose lines should be named, if possible
+ *
+ * Looks for device property "gpio-line-names" and if it exists assigns
+ * GPIO line names for the chip. The memory allocated for the assigned
+ * names belong to the underlying software node and should not be released
+ * by the caller.
+ */
+static int devprop_gpiochip_set_names(struct gpio_chip *chip)
+{
+	struct gpio_device *gdev = chip->gpiodev;
+	struct device *dev = chip->parent;
+	const char **names;
+	int ret, i;
+	int count;
+
+	count = device_property_count_strings(dev, "gpio-line-names");
+	if (count < 0)
+		return 0;
+
+	if (count > gdev->ngpio) {
+		dev_warn(&gdev->dev, "gpio-line-names is length %d but should be at most length %d",
+			 count, gdev->ngpio);
+		count = gdev->ngpio;
+	}
+
+	names = kcalloc(count, sizeof(*names), GFP_KERNEL);
+	if (!names)
+		return -ENOMEM;
+
+	ret = device_property_read_string_array(dev, "gpio-line-names",
+						names, count);
+	if (ret < 0) {
+		dev_warn(&gdev->dev, "failed to read GPIO line names\n");
+		kfree(names);
+		return ret;
+	}
+
+	for (i = 0; i < count; i++)
+		gdev->descs[i].name = names[i];
+
+	kfree(names);
+
+	return 0;
+}
+
 static unsigned long *gpiochip_allocate_mask(struct gpio_chip *gc)
 {
 	unsigned long *p;
diff --git a/include/linux/gpio/driver.h b/include/linux/gpio/driver.h
index 56485a040b82..4a7e295c3640 100644
--- a/include/linux/gpio/driver.h
+++ b/include/linux/gpio/driver.h
@@ -756,8 +756,6 @@ struct gpio_desc *gpiochip_request_own_desc(struct gpio_chip *gc,
 					    enum gpiod_flags dflags);
 void gpiochip_free_own_desc(struct gpio_desc *desc);
 
-int devprop_gpiochip_set_names(struct gpio_chip *gc);
-
 #ifdef CONFIG_GPIOLIB
 
 /* lock/unlock as IRQ */
-- 
2.26.1