linux-kernel - [PATCH 07/21] gpiolib: provide gpio_device_get

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Message-Id: <20230905185309.131295-8-brgl@bgdev.pl>
Date:   Tue,  5 Sep 2023 20:52:55 +0200
From:   Bartosz Golaszewski <brgl@...ev.pl>
To:     Aaro Koskinen <aaro.koskinen@....fi>,
        Janusz Krzysztofik <jmkrzyszt@...il.com>,
        Tony Lindgren <tony@...mide.com>,
        Russell King <linux@...linux.org.uk>,
        Mika Westerberg <mika.westerberg@...ux.intel.com>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Linus Walleij <linus.walleij@...aro.org>,
        Bartosz Golaszewski <brgl@...ev.pl>,
        Dipen Patel <dipenp@...dia.com>,
        Thierry Reding <thierry.reding@...il.com>,
        Jonathan Hunter <jonathanh@...dia.com>,
        Hans de Goede <hdegoede@...hat.com>,
        Mark Gross <markgross@...nel.org>
Cc:     linux-arm-kernel@...ts.infradead.org, linux-omap@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-gpio@...r.kernel.org,
        linux-acpi@...r.kernel.org, timestamp@...ts.linux.dev,
        linux-tegra@...r.kernel.org, platform-driver-x86@...r.kernel.org,
        Bartosz Golaszewski <bartosz.golaszewski@...aro.org>
Subject: [PATCH 07/21] gpiolib: provide gpio_device_get_base()

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

Let's start adding getters for the opaque struct gpio_device. Start with
a function allowing to retrieve the base GPIO number.

Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@...aro.org>
---
 drivers/gpio/gpiolib.c      | 13 +++++++++++++
 include/linux/gpio/driver.h |  3 +++
 2 files changed, 16 insertions(+)

diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c
index 9637a79a9a60..9715bbc698e9 100644
--- a/drivers/gpio/gpiolib.c
+++ b/drivers/gpio/gpiolib.c
@@ -233,6 +233,19 @@ struct gpio_device *gpiod_to_device(struct gpio_desc *desc)
 }
 EXPORT_SYMBOL_GPL(gpiod_to_device);
 
+/**
+ * gpio_device_get_base() - Get the base GPIO number allocated by this device
+ * @gdev: GPIO device
+ *
+ * Returns:
+ * First GPIO number in the global GPIO numberspace for this device.
+ */
+int gpio_device_get_base(struct gpio_device *gdev)
+{
+	return gdev->base;
+}
+EXPORT_SYMBOL_GPL(gpio_device_get_base);
+
 /* dynamic allocation of GPIOs, e.g. on a hotplugged device */
 static int gpiochip_find_base(int ngpio)
 {
diff --git a/include/linux/gpio/driver.h b/include/linux/gpio/driver.h
index e3747e730ed1..b68b3493b29d 100644
--- a/include/linux/gpio/driver.h
+++ b/include/linux/gpio/driver.h
@@ -780,6 +780,9 @@ void gpiochip_unlock_as_irq(struct gpio_chip *gc, unsigned int offset);
 struct gpio_chip *gpiod_to_chip(const struct gpio_desc *desc);
 struct gpio_device *gpiod_to_device(struct gpio_desc *desc);
 
+/* struct gpio_device getters */
+int gpio_device_get_base(struct gpio_device *gdev);
+
 #else /* CONFIG_GPIOLIB */
 
 #include <linux/err.h>
-- 
2.39.2