From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:33704) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1ZlgHU-0007wx-RS for qemu-devel@nongnu.org; Mon, 12 Oct 2015 12:49:03 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1ZlgHR-0003Kh-Ky for qemu-devel@nongnu.org; Mon, 12 Oct 2015 12:49:00 -0400 Received: from mail-wi0-f174.google.com ([209.85.212.174]:38828) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1ZlgHR-0003JZ-F1 for qemu-devel@nongnu.org; Mon, 12 Oct 2015 12:48:57 -0400 Received: by wieq12 with SMTP id q12so29092883wie.1 for ; Mon, 12 Oct 2015 09:48:57 -0700 (PDT) From: Eric Auger Date: Mon, 12 Oct 2015 16:48:40 +0000 Message-Id: <1444668523-2252-4-git-send-email-eric.auger@linaro.org> In-Reply-To: <1444668523-2252-1-git-send-email-eric.auger@linaro.org> References: <1444668523-2252-1-git-send-email-eric.auger@linaro.org> Subject: [Qemu-devel] [RFC 3/6] device_tree: introduce qemu_fdt_node_path List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: eric.auger@st.com, eric.auger@linaro.org, qemu-devel@nongnu.org, alex.williamson@redhat.com Cc: thomas.lendacky@amd.com, b.reynal@virtualopensystems.com, patches@linaro.org, suravee.suthikulpanit@amd.com, pbonzini@redhat.com, christoffer.dall@linaro.org This new helper routine returns the node path of a device referred to by its name and compat string. Signed-off-by: Eric Auger --- device_tree.c | 40 ++++++++++++++++++++++++++++++++++++++++ include/sysemu/device_tree.h | 3 +++ 2 files changed, 43 insertions(+) diff --git a/device_tree.c b/device_tree.c index 58a5329..f184e3c 100644 --- a/device_tree.c +++ b/device_tree.c @@ -171,6 +171,46 @@ static int findnode_nofail(void *fdt, const char *node_path) return offset; } +/** + * qemu_fdt_node_path + * + * return the node path of a device, referred to by its node name + * and its compat string + * fdt: pointer to the dt blob + * name: name of the device + * compat: compatibility string of the device + * + * returns the node path + */ +int qemu_fdt_node_path(void *fdt, const char *name, char *compat, + char **node_path) +{ + int offset = 0, len; + const char *iter_name; + char path[256]; + int ret; + + *node_path = NULL; + while (1) { + offset = fdt_node_offset_by_compatible(fdt, offset, compat); + if (offset == -FDT_ERR_NOTFOUND) { + break; + } + iter_name = fdt_get_name(fdt, offset, &len); + if (!strncmp(iter_name, name, len)) { + goto found; + } + } + return offset; + +found: + ret = fdt_get_path(fdt, offset, path, 256); + if (!ret) { + *node_path = g_strdup(path); + } + return ret; +} + int qemu_fdt_setprop(void *fdt, const char *node_path, const char *property, const void *val, int size) { diff --git a/include/sysemu/device_tree.h b/include/sysemu/device_tree.h index 307e53d..f9e6e6e 100644 --- a/include/sysemu/device_tree.h +++ b/include/sysemu/device_tree.h @@ -18,6 +18,9 @@ void *create_device_tree(int *sizep); void *load_device_tree(const char *filename_path, int *sizep); void *load_device_tree_from_sysfs(void); +int qemu_fdt_node_path(void *fdt, const char *name, char *compat, + char **node_path); + int qemu_fdt_setprop(void *fdt, const char *node_path, const char *property, const void *val, int size); int qemu_fdt_setprop_cell(void *fdt, const char *node_path, -- 1.9.1