From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:44149) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1a9XgZ-0008GS-Q3 for qemu-devel@nongnu.org; Thu, 17 Dec 2015 07:29:32 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1a9XgY-0006Hp-SV for qemu-devel@nongnu.org; Thu, 17 Dec 2015 07:29:31 -0500 Received: from mail-wm0-x22f.google.com ([2a00:1450:400c:c09::22f]:35232) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1a9XgY-0006He-Fz for qemu-devel@nongnu.org; Thu, 17 Dec 2015 07:29:30 -0500 Received: by mail-wm0-x22f.google.com with SMTP id l126so19120192wml.0 for ; Thu, 17 Dec 2015 04:29:30 -0800 (PST) From: Eric Auger Date: Thu, 17 Dec 2015 12:29:24 +0000 Message-Id: <1450355367-14818-4-git-send-email-eric.auger@linaro.org> In-Reply-To: <1450355367-14818-1-git-send-email-eric.auger@linaro.org> References: <1450355367-14818-1-git-send-email-eric.auger@linaro.org> Subject: [Qemu-devel] [PATCH 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, peter.maydell@linaro.org, david@gibson.dropbear.id.au, alex.williamson@redhat.com Cc: thomas.lendacky@amd.com, thuth@redhat.com, b.reynal@virtualopensystems.com, patches@linaro.org, crosthwaitepeter@gmail.com, suravee.suthikulpanit@amd.com, pbonzini@redhat.com, alex.bennee@linaro.org, christoffer.dall@linaro.org This new helper routine returns the node path of a device referred to by its node name and compat string. Signed-off-by: Eric Auger --- RFC -> v1: - improve error handling according to Alex' comments --- device_tree.c | 45 ++++++++++++++++++++++++++++++++++++++++++++ include/sysemu/device_tree.h | 3 +++ 2 files changed, 48 insertions(+) diff --git a/device_tree.c b/device_tree.c index e556a99..b5d7e0b 100644 --- a/device_tree.c +++ b/device_tree.c @@ -233,6 +233,51 @@ static int findnode_nofail(void *fdt, const char *node_path) return offset; } +/** + * qemu_fdt_node_path + * + * return the node path of a device, given its node name and its + * compat string + * fdt: pointer to the dt blob + * name: device node name + * compat: compatibility string of the device + * + * upon success, the path is output at node_path address + * returns 0 on success, < 0 on failure + */ +int qemu_fdt_node_path(void *fdt, const char *name, char *compat, + char **node_path) +{ + int offset, len, ret; + const char *iter_name; + char path[256]; + + *node_path = NULL; + offset = fdt_node_offset_by_compatible(fdt, -1, compat); + while (offset != -FDT_ERR_NOTFOUND) { + if (offset < 0) { + continue; + } + iter_name = fdt_get_name(fdt, offset, &len); + if (!iter_name) { + continue; + } + + if (!strncmp(iter_name, name, len)) { + goto found; + } + offset = fdt_node_offset_by_compatible(fdt, offset, compat); + } + 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