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[85.223.209.53]) by smtp.gmail.com with ESMTPSA id x90sm1394299ljb.86.2017.11.09.09.10.42 (version=TLS1_2 cipher=ECDHE-RSA-AES128-SHA bits=128/128); Thu, 09 Nov 2017 09:10:43 -0800 (PST) From: Oleksandr Tyshchenko To: xen-devel@lists.xenproject.org Date: Thu, 9 Nov 2017 19:10:01 +0200 Message-Id: <1510247421-24094-12-git-send-email-olekstysh@gmail.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1510247421-24094-1-git-send-email-olekstysh@gmail.com> References: <1510247421-24094-1-git-send-email-olekstysh@gmail.com> Cc: Oleksandr Tyshchenko , Stefano Stabellini , Julien Grall Subject: [Xen-devel] [RFC PATCH 11/31] xen/device-tree: Add dt_property_count_elems_of_size helper X-BeenThere: xen-devel@lists.xen.org X-Mailman-Version: 2.1.18 Precedence: list List-Id: Xen developer discussion List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , MIME-Version: 1.0 Errors-To: xen-devel-bounces@lists.xen.org Sender: "Xen-devel" X-Virus-Scanned: ClamAV using ClamSMTP From: Oleksandr Tyshchenko This is a port from Linux. Signed-off-by: Oleksandr Tyshchenko CC: Stefano Stabellini CC: Julien Grall --- xen/common/device_tree.c | 20 ++++++++++++++++++++ xen/include/xen/device_tree.h | 15 +++++++++++++++ 2 files changed, 35 insertions(+) diff --git a/xen/common/device_tree.c b/xen/common/device_tree.c index 0fa654e..7b4cad3 100644 --- a/xen/common/device_tree.c +++ b/xen/common/device_tree.c @@ -278,6 +278,26 @@ const char *dt_property_next_string(const struct dt_property *prop, return curv; } +int dt_property_count_elems_of_size(const struct dt_device_node *np, + const char *propname, int elem_size) +{ + const struct dt_property *prop = dt_find_property(np, propname, NULL); + + if ( !prop ) + return -EINVAL; + if ( !prop->value ) + return -ENODATA; + + if ( prop->length % elem_size != 0 ) + { + printk("%s: size of %s is not a multiple of %d\n", np->full_name, + propname, elem_size); + return -EINVAL; + } + + return prop->length / elem_size; +} + bool_t dt_device_is_compatible(const struct dt_device_node *device, const char *compat) { diff --git a/xen/include/xen/device_tree.h b/xen/include/xen/device_tree.h index 87b4b67..e2d7346 100644 --- a/xen/include/xen/device_tree.h +++ b/xen/include/xen/device_tree.h @@ -461,6 +461,21 @@ const char *dt_property_next_string(const struct dt_property *prop, s = dt_property_next_string(prop, s)) /** + * dt_property_count_elems_of_size - Count the number of elements in a property + * + * @np: device node from which the property value is to be read. + * @propname: name of the property to be searched. + * @elem_size: size of the individual element + * + * Search for a property in a device node and count the number of elements of + * size elem_size in it. Returns number of elements on sucess, -EINVAL if the + * property does not exist or its length does not match a multiple of elem_size + * and -ENODATA if the property does not have a value. + */ +int dt_property_count_elems_of_size(const struct dt_device_node *np, + const char *propname, int elem_size); + +/** * Checks if the given "compat" string matches one of the strings in * the device's "compatible" property */