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[80.11.198.90]) by smtp.gmail.com with ESMTPSA id df10sm81858826wjb.44.2016.01.06.07.13.31 (version=TLS1_2 cipher=ECDHE-RSA-AES128-SHA bits=128/128); Wed, 06 Jan 2016 07:13:31 -0800 (PST) From: Eric Auger To: eric.auger@st.com, eric.auger@linaro.org, qemu-devel@nongnu.org, qemu-arm@nongnu.org, peter.maydell@linaro.org, david@gibson.dropbear.id.au, alex.williamson@redhat.com Cc: alex.bennee@linaro.org, thuth@redhat.com, crosthwaitepeter@gmail.com, patches@linaro.org, christoffer.dall@linaro.org, pbonzini@redhat.com, b.reynal@virtualopensystems.com, suravee.suthikulpanit@amd.com, thomas.lendacky@amd.com Subject: [PATCH v2 3/7] device_tree: introduce qemu_fdt_node_path Date: Wed, 6 Jan 2016 15:13:21 +0000 Message-Id: <1452093205-30167-4-git-send-email-eric.auger@linaro.org> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1452093205-30167-1-git-send-email-eric.auger@linaro.org> References: <1452093205-30167-1-git-send-email-eric.auger@linaro.org> X-TUID: nqZ9mG7r/m1m 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 --- v1 -> v2: - move doc comment in header file - do not use a fixed size buffer - break on errors in while loop - use strcmp instead of strncmp RFC -> v1: - improve error handling according to Alex' comments --- device_tree.c | 37 +++++++++++++++++++++++++++++++++++++ include/sysemu/device_tree.h | 14 ++++++++++++++ 2 files changed, 51 insertions(+) diff --git a/device_tree.c b/device_tree.c index b262c2d..8441e01 100644 --- a/device_tree.c +++ b/device_tree.c @@ -231,6 +231,43 @@ static int findnode_nofail(void *fdt, const char *node_path) return offset; } +int qemu_fdt_node_path(void *fdt, const char *name, char *compat, + char **node_path) +{ + int offset, len, ret; + const char *iter_name; + unsigned int path_len = 16; + char *path; + + *node_path = NULL; + offset = fdt_node_offset_by_compatible(fdt, -1, compat); + + while (offset >= 0) { + iter_name = fdt_get_name(fdt, offset, &len); + if (!iter_name) { + offset = len; + break; + } + if (!strcmp(iter_name, name)) { + goto found; + } + offset = fdt_node_offset_by_compatible(fdt, offset, compat); + } + return offset; + +found: + path = g_malloc(path_len); + while ((ret = fdt_get_path(fdt, offset, path, path_len)) + == -FDT_ERR_NOSPACE) { + path_len += 16; + path = g_realloc(path, path_len); + } + if (!ret) { + *node_path = 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 fdf25a4..269cb1c 100644 --- a/include/sysemu/device_tree.h +++ b/include/sysemu/device_tree.h @@ -20,6 +20,20 @@ void *load_device_tree(const char *filename_path, int *sizep); void *load_device_tree_from_sysfs(void); #endif +/** + * 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 + * @node_path: returned node path + * + * 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 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