dm: core: Add DM_FLAG_PROBE_AFTER_BIND flag

Introduce DM_FLAG_PROBE_AFTER_BIND flag, which can be set by driver or
uclass in .bind(), to indicate such driver instance should be probe()d
once binding of all devices is complete.

This is useful in case the driver determines that hardware initialization
is mandatory on boot, and such initialization happens only in probe().
This also solves the inability to call device_probe() from .bind().

Signed-off-by: Marek Vasut <marex@denx.de>
Cc: Patrice Chotard <patrice.chotard@foss.st.com>
Cc: Patrick Delaunay <patrick.delaunay@foss.st.com>
Cc: Sean Anderson <seanga2@gmail.com>
Cc: Simon Glass <sjg@chromium.org>
Cc: Steven Lawrance <steven.lawrance@softathome.com>
Reviewed-by: Patrice Chotard <patrice.chotard@foss.st.com>
Tested-by: Patrice Chotard <patrice.chotard@foss.st.com>

diff --git a/drivers/core/root.c b/drivers/core/root.c
index e09c12f4d6eadd9df51246d615ffc94a126bd432..17dd1205a32f2f88d9229c571b7b712ea91e94d9 100644 (file)
--- a/drivers/core/root.c
+++ b/drivers/core/root.c
@@ -361,6 +361,28 @@ void *dm_priv_to_rw(void *priv)
 }
 #endif
 
+static int dm_probe_devices(struct udevice *dev, bool pre_reloc_only)
+{
+       u32 mask = DM_FLAG_PROBE_AFTER_BIND;
+       u32 flags = dev_get_flags(dev);
+       struct udevice *child;
+       int ret;
+
+       if (pre_reloc_only)
+               mask |= DM_FLAG_PRE_RELOC;
+
+       if ((flags & mask) == mask) {
+               ret = device_probe(dev);
+               if (ret)
+                       return ret;
+       }
+
+       list_for_each_entry(child, &dev->child_head, sibling_node)
+               dm_probe_devices(child, pre_reloc_only);
+
+       return 0;
+}
+
 /**
  * dm_scan() - Scan tables to bind devices
  *
@@ -393,7 +415,7 @@ static int dm_scan(bool pre_reloc_only)
        if (ret)
                return ret;
 
-       return 0;
+       return dm_probe_devices(gd->dm_root, pre_reloc_only);
 }
 
 int dm_init_and_scan(bool pre_reloc_only)

diff --git a/include/dm/device.h b/include/dm/device.h
index b474888d025e7d2c75328f392a37f30e50dfc60e..5bdb10653f8e3725f55e6692da301f5171bf1ff1 100644 (file)
--- a/include/dm/device.h
+++ b/include/dm/device.h
@@ -80,6 +80,9 @@ struct driver_info;
  */
 #define DM_FLAG_VITAL                  (1 << 14)
 
+/* Device must be probed after it was bound */
+#define DM_FLAG_PROBE_AFTER_BIND       (1 << 15)
+
 /*
  * One or multiple of these flags are passed to device_remove() so that
  * a selective device removal as specified by the remove-stage and the