dm: core: Move "/chosen" and "/firmware" node scan

Use the new function dm_scan_fdt_ofnode_path() to scan all the nodes
which aren't devices themselves but may contain some:
- "/chosen"
- "/clocks"
- "/firmware"

The patch removes the strcmp call in recursive function dm_scan_fdt_live()
and also corrects a conflict with the 2 applied patches in
the commit 1712ca21924b ("dm: core: Scan /firmware node by default")
and in the commit 747558d01457 ("dm: fdt: scan for devices under
/firmware too"): the subnodes of "/firmware" (optee for example)
are bound 2 times.

For example the dm tree command result on STM32MP1 is:

STM32MP> dm tree
 Class     Index  Probed  Driver                Name
 -----------------------------------------------------------
 root          0  [ + ]   root_driver           root_driver
 firmware      0  [   ]   psci                  |-- psci
 sysreset      0  [   ]   psci-sysreset         |   `-- psci-sysreset
 simple_bus    0  [ + ]   generic_simple_bus    |-- soc
...
 tee           0  [ + ]   optee                 |-- optee
...
 tee           1  [   ]   optee                 `-- optee

Signed-off-by: Patrick Delaunay <patrick.delaunay@st.com>
Tested-by: Michal Simek <michal.simek@xilinx.com>
Reviewed-by: Simon Glass <sjg@chromium.org>

diff --git a/drivers/core/root.c b/drivers/core/root.c
index e85643819e7bbdf5cdfe49145257cde82e88571a..14df16c280d9876dfb51a5966eb7870835542c28 100644 (file)
--- a/drivers/core/root.c
+++ b/drivers/core/root.c
@@ -203,15 +203,6 @@ static int dm_scan_fdt_live(struct udevice *parent,
        int ret = 0, err;
 
        for (np = node_parent->child; np; np = np->sibling) {
-               /* "chosen" node isn't a device itself but may contain some: */
-               if (!strcmp(np->name, "chosen")) {
-                       pr_debug("parsing subnodes of \"chosen\"\n");
-
-                       err = dm_scan_fdt_live(parent, np, pre_reloc_only);
-                       if (err && !ret)
-                               ret = err;
-                       continue;
-               }
 
                if (!of_device_is_available(np)) {
                        pr_debug("   - ignoring disabled device\n");
@@ -256,21 +247,6 @@ static int dm_scan_fdt_node(struct udevice *parent, const void *blob,
             offset = fdt_next_subnode(blob, offset)) {
                const char *node_name = fdt_get_name(blob, offset, NULL);
 
-               /*
-                * The "chosen" and "firmware" nodes aren't devices
-                * themselves but may contain some:
-                */
-               if (!strcmp(node_name, "chosen") ||
-                   !strcmp(node_name, "firmware")) {
-                       pr_debug("parsing subnodes of \"%s\"\n", node_name);
-
-                       err = dm_scan_fdt_node(parent, blob, offset,
-                                              pre_reloc_only);
-                       if (err && !ret)
-                               ret = err;
-                       continue;
-               }
-
                if (!fdtdec_get_is_enabled(blob, offset)) {
                        pr_debug("   - ignoring disabled device\n");
                        continue;
@@ -315,7 +291,8 @@ int dm_scan_fdt(const void *blob, bool pre_reloc_only)
        return dm_scan_fdt_node(gd->dm_root, blob, 0, pre_reloc_only);
 }
 
-static int dm_scan_fdt_ofnode_path(const char *path, bool pre_reloc_only)
+static int dm_scan_fdt_ofnode_path(const void *blob, const char *path,
+                                  bool pre_reloc_only)
 {
        ofnode node;
 
@@ -327,13 +304,18 @@ static int dm_scan_fdt_ofnode_path(const char *path, bool pre_reloc_only)
        if (of_live_active())
                return dm_scan_fdt_live(gd->dm_root, node.np, pre_reloc_only);
 #endif
-       return dm_scan_fdt_node(gd->dm_root, gd->fdt_blob, node.of_offset,
+       return dm_scan_fdt_node(gd->dm_root, blob, node.of_offset,
                                pre_reloc_only);
 }
 
 int dm_extended_scan_fdt(const void *blob, bool pre_reloc_only)
 {
-       int ret;
+       int ret, i;
+       const char * const nodes[] = {
+               "/chosen",
+               "/clocks",
+               "/firmware"
+       };
 
        ret = dm_scan_fdt(blob, pre_reloc_only);
        if (ret) {
@@ -341,16 +323,16 @@ int dm_extended_scan_fdt(const void *blob, bool pre_reloc_only)
                return ret;
        }
 
-       ret = dm_scan_fdt_ofnode_path("/clocks", pre_reloc_only);
-       if (ret) {
-               debug("scan for /clocks failed: %d\n", ret);
-               return ret;
+       /* Some nodes aren't devices themselves but may contain some */
+       for (i = 0; i < ARRAY_SIZE(nodes); i++) {
+               ret = dm_scan_fdt_ofnode_path(blob, nodes[i], pre_reloc_only);
+               if (ret) {
+                       debug("dm_scan_fdt() scan for %s failed: %d\n",
+                             nodes[i], ret);
+                       return ret;
+               }
        }
 
-       ret = dm_scan_fdt_ofnode_path("/firmware", pre_reloc_only);
-       if (ret)
-               debug("scan for /firmware failed: %d\n", ret);
-
        return ret;
 }
 #endif

diff --git a/test/dm/test-fdt.c b/test/dm/test-fdt.c
index 75ae08081cdc997355c522bdf55d4396d0d97c45..3500ab1b46c0d57aa51d15077a8002c19896e313 100644 (file)
--- a/test/dm/test-fdt.c
+++ b/test/dm/test-fdt.c
@@ -255,7 +255,7 @@ static int dm_test_fdt(struct unit_test_state *uts)
        int ret;
        int i;
 
-       ret = dm_scan_fdt(gd->fdt_blob, false);
+       ret = dm_extended_scan_fdt(gd->fdt_blob, false);
        ut_assert(!ret);
 
        ret = uclass_get(UCLASS_TEST_FDT, &uc);