diff mbox series

[v2,02/13] gpiolib: Introduce gpiochip_node_count() helper

Message ID 20220329152926.50958-3-andriy.shevchenko@linux.intel.com (mailing list archive)
State Superseded
Headers show
Series gpiolib: Two new helpers and way toward fwnode | expand

Commit Message

Andy Shevchenko March 29, 2022, 3:29 p.m. UTC
The gpiochip_node_count() helper iterates over the device child nodes that
have the "gpio-controller" property set. It returns the number of such nodes
under a given device.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
---
 include/linux/gpio/driver.h | 12 ++++++++++++
 1 file changed, 12 insertions(+)

Comments

Geert Uytterhoeven March 30, 2022, 10:02 a.m. UTC | #1
Hi Andy,

On Tue, Mar 29, 2022 at 5:29 PM Andy Shevchenko
<andriy.shevchenko@linux.intel.com> wrote:
> The gpiochip_node_count() helper iterates over the device child nodes that
> have the "gpio-controller" property set. It returns the number of such nodes
> under a given device.
>
> Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>

Thanks for your patch!

> --- a/include/linux/gpio/driver.h
> +++ b/include/linux/gpio/driver.h
> @@ -755,4 +755,16 @@ static inline void gpiochip_unlock_as_irq(struct gpio_chip *gc,
>         device_for_each_child_node(dev, child)                                  \
>                 if (!fwnode_property_present(child, "gpio-controller")) {} else
>
> +static inline unsigned int gpiochip_node_count(struct device *dev)
> +{
> +       struct fwnode_handle *child;
> +       unsigned int count;

Preinitialize to zero?

> +
> +       count = 0;
> +       for_each_gpiochip_node(dev, child)
> +               count++;
> +
> +       return count;
> +}
> +
>  #endif /* __LINUX_GPIO_DRIVER_H */

Regardless:
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Tested-by: Geert Uytterhoeven <geert+renesas@glider.be>

Gr{oetje,eeting}s,

                        Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds
Andy Shevchenko March 30, 2022, 11:35 a.m. UTC | #2
On Wed, Mar 30, 2022 at 12:02:07PM +0200, Geert Uytterhoeven wrote:
> On Tue, Mar 29, 2022 at 5:29 PM Andy Shevchenko
> <andriy.shevchenko@linux.intel.com> wrote:

...

> > +       unsigned int count;
> 
> Preinitialize to zero?

Whatever for what consensus will be achieved. Initially I have that way,
then I changed.

> > +       count = 0;
> > +       for_each_gpiochip_node(dev, child)
> > +               count++;
> 
> Regardless:
> Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
> Tested-by: Geert Uytterhoeven <geert+renesas@glider.be>

Thanks!
diff mbox series

Patch

diff --git a/include/linux/gpio/driver.h b/include/linux/gpio/driver.h
index e6b9c17614ef..bc2ea9f65022 100644
--- a/include/linux/gpio/driver.h
+++ b/include/linux/gpio/driver.h
@@ -755,4 +755,16 @@  static inline void gpiochip_unlock_as_irq(struct gpio_chip *gc,
 	device_for_each_child_node(dev, child)					\
 		if (!fwnode_property_present(child, "gpio-controller")) {} else
 
+static inline unsigned int gpiochip_node_count(struct device *dev)
+{
+	struct fwnode_handle *child;
+	unsigned int count;
+
+	count = 0;
+	for_each_gpiochip_node(dev, child)
+		count++;
+
+	return count;
+}
+
 #endif /* __LINUX_GPIO_DRIVER_H */