From mboxrd@z Thu Jan 1 00:00:00 1970 From: Dong Aisheng Subject: [RFC PATCH v3 1/5] dt: add of_get_child_count helper function Date: Wed, 21 Dec 2011 01:40:36 +0800 Message-ID: <1324402840-32451-2-git-send-email-b29396@freescale.com> References: <1324402840-32451-1-git-send-email-b29396@freescale.com> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <1324402840-32451-1-git-send-email-b29396-KZfg59tc24xl57MIdRCFDg@public.gmane.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: devicetree-discuss-bounces+gldd-devicetree-discuss=m.gmane.org-uLR06cmDAlY/bJ5BZ2RsiQ@public.gmane.org Sender: devicetree-discuss-bounces+gldd-devicetree-discuss=m.gmane.org-uLR06cmDAlY/bJ5BZ2RsiQ@public.gmane.org To: linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org Cc: linus.walleij-0IS4wlFg1OjSUeElwK9/Pw@public.gmane.org, s.hauer-bIcnvbaLZ9MEGnE8C9+IrQ@public.gmane.org, rob.herring-bsGFqQB8/DxBDgjK7y7TUQ@public.gmane.org, linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org, kernel-bIcnvbaLZ9MEGnE8C9+IrQ@public.gmane.org, cjb-2X9k7bc8m7Mdnm+yROfE0A@public.gmane.org, devicetree-discuss-uLR06cmDAlY/bJ5BZ2RsiQ@public.gmane.org List-Id: devicetree@vger.kernel.org From: Dong Aisheng Currently most code to get child count in kernel are almost same, add a helper to implement this function for dt to use. --- Changes v1->v2: * change the name from of_get_child_number to of_get_child_count Signed-off-by: Dong Aisheng Cc: Grant Likely Cc: Rob Herring --- include/linux/of.h | 16 ++++++++++++++++ 1 files changed, 16 insertions(+), 0 deletions(-) diff --git a/include/linux/of.h b/include/linux/of.h index 4948552..d0d91a1 100644 --- a/include/linux/of.h +++ b/include/linux/of.h @@ -189,6 +189,17 @@ extern struct device_node *of_get_next_child(const struct device_node *node, for (child = of_get_next_child(parent, NULL); child != NULL; \ child = of_get_next_child(parent, child)) +static inline int of_get_child_count(const struct device_node *np) +{ + struct device_node *child = NULL; + int num = 0; + + while ((child = of_get_next_child(np, child))) + num++; + + return num; +} + extern struct device_node *of_find_node_with_property( struct device_node *from, const char *prop_name); #define for_each_node_with_property(dn, prop_name) \ @@ -262,6 +273,11 @@ static inline bool of_have_populated_dt(void) #define for_each_child_of_node(parent, child) \ while (0) +static inline int of_get_child_count(const struct device_node *np) +{ + return -ENOSYS; +} + static inline int of_device_is_compatible(const struct device_node *device, const char *name) { -- 1.7.0.4