[PATCH 1/6] event: signal when livetree has been built

[Caleb Connolly]

OF_LIVE offers a variety of benefits, one of them being that the live
tree can be modified without caring about the underlying FDT. This is
particularly valuable for working around U-Boot limitations like lacking
USB superspeed support on Qualcomm platforms, no runtime OTG, or
peripherals like the sdcard being broken (and displaying potentially
worrying error messages).

Add an event to signal when the live tree has been built so that we can
apply fixups to it directly before devices are bound.

Signed-off-by: Caleb Connolly <caleb.conno...@linaro.org>
---
 common/event.c  | 3 +++
 include/event.h | 9 +++++++++
 lib/of_live.c   | 3 +++
 3 files changed, 15 insertions(+)

diff --git a/common/event.c b/common/event.c
index 
dda569d447851f559a83f98fb7b1f3543156eab5..8d7513eb10b61919e1e784481dfdcc076be14986
 100644
--- a/common/event.c
+++ b/common/event.c
@@ -47,8 +47,11 @@ const char *const type_name[] = {
        "ft_fixup",
 
        /* main loop events */
        "main_loop",
+
+       /* livetree has been built */
+       "of_live_init",
 };
 
 _Static_assert(ARRAY_SIZE(type_name) == EVT_COUNT, "event type_name size");
 #endif
diff --git a/include/event.h b/include/event.h
index 
75141a192a48b0931667632f41be8ff4d6139f7c..3fc673ba635ed45467aae8587705d37bef1c2a3f
 100644
--- a/include/event.h
+++ b/include/event.h
@@ -152,8 +152,17 @@ enum event_t {
         * A non-zero return value causes the boot to fail.
         */
        EVT_MAIN_LOOP,
 
+       /**
+        * @EVT_OF_LIVE_INIT:
+        * This event is triggered immediately after the live device tree has 
been
+        * built. This allows for machine specific fixups to be done to the 
live tree
+        * (like disabling known-unsupported devices) before DM init happens. 
This
+        * event is only available if OF_LIVE is enabled and is only used after 
relocation.
+        */
+       EVT_OF_LIVE_INIT,
+
        /**
         * @EVT_COUNT:
         * This constants holds the maximum event number + 1 and is used when
         * looping over all event classes.
diff --git a/lib/of_live.c b/lib/of_live.c
index 
90b9459ede313e492e28c8556c730f3bd8aaa9df..e1962b8f1fb9d8c2c87d04ca4e238a1e4d00376a
 100644
--- a/lib/of_live.c
+++ b/lib/of_live.c
@@ -10,8 +10,9 @@
 
 #define LOG_CATEGORY   LOGC_DT
 
 #include <abuf.h>
+#include <event.h>
 #include <log.h>
 #include <linux/libfdt.h>
 #include <of_live.h>
 #include <malloc.h>
@@ -334,8 +335,10 @@ int of_live_build(const void *fdt_blob, struct device_node 
**rootp)
                return ret;
        }
        debug("%s: stop\n", __func__);
 
+       event_notify_null(EVT_OF_LIVE_INIT);
+
        return ret;
 }
 
 void of_live_free(struct device_node *root)

-- 
2.49.0