[PATCH 18/30] dm: core: Create a struct for device runtime info

[Simon Glass]

At present when driver model needs to change a device it simply updates
the struct udevice structure. But with of-platdata-inst most of the fields
are not modified at runtime. In fact, typically only the flags need to
change.

For systems running SPL from read-only memory it is convenient to separate
out the runtime information, so that the devices don't need to be copied
before being used.

Create a new udevice_rt table, similar to the existing driver_rt. For now
it just holds the flags, although they are not used in this patch.

Signed-off-by: Simon Glass <sjg at chromium.org>
---

 drivers/core/root.c               | 12 ++++++++++++
 include/asm-generic/global_data.h | 12 ++++++++++++
 include/dm/device.h               | 17 ++++++++++++++++-
 3 files changed, 40 insertions(+), 1 deletion(-)

diff --git a/drivers/core/root.c b/drivers/core/root.c
index bb797f12203..6966e9a7ff1 100644
--- a/drivers/core/root.c
+++ b/drivers/core/root.c
@@ -132,6 +132,18 @@ static int dm_setup_inst(void)
 {
 	DM_ROOT_NON_CONST = DM_DEVICE_GET(root);
 
+	if (CONFIG_IS_ENABLED(OF_PLATDATA_RT)) {
+		struct udevice_rt *urt;
+		int n_ents;
+
+		/* Allocate the udevice_rt table */
+		n_ents = ll_entry_count(struct udevice, udevice);
+		urt = calloc(n_ents, sizeof(struct udevice_rt));
+		if (!urt)
+			return log_msg_ret("urt", -ENOMEM);
+		gd_set_dm_udevice_rt(urt);
+	}
+
 	return 0;
 }
 
diff --git a/include/asm-generic/global_data.h b/include/asm-generic/global_data.h
index b63575919f0..67161f624ec 100644
--- a/include/asm-generic/global_data.h
+++ b/include/asm-generic/global_data.h
@@ -205,6 +205,10 @@ struct global_data {
         /** Dynamic info about the driver */
 	struct driver_rt *dm_driver_rt;
 # endif
+#if CONFIG_IS_ENABLED(OF_PLATDATA_RT)
+	/** @dm_udevice_rt: Dynamic info about the udevice */
+	struct udevice_rt *dm_udevice_rt;
+# endif
 #endif
 #ifdef CONFIG_TIMER
 	/**
@@ -465,6 +469,14 @@ struct global_data {
 #define gd_dm_driver_rt()		NULL
 #endif
 
+#if CONFIG_IS_ENABLED(OF_PLATDATA_RT)
+#define gd_set_dm_udevice_rt(dyn)	gd->dm_udevice_rt = dyn
+#define gd_dm_udevice_rt()		gd->dm_udevice_rt
+#else
+#define gd_set_dm_udevice_rt(dyn)
+#define gd_dm_udevice_rt()		NULL
+#endif
+
 #ifdef CONFIG_GENERATE_ACPI_TABLE
 #define gd_acpi_ctx()		gd->acpi_ctx
 #else
diff --git a/include/dm/device.h b/include/dm/device.h
index 00d25c16862..ba62b5f0365 100644
--- a/include/dm/device.h
+++ b/include/dm/device.h
@@ -166,7 +166,7 @@ struct udevice {
 	struct list_head sibling_node;
 	u32 flags_;
 	int seq_;
-#if !CONFIG_IS_ENABLED(OF_PLATDATA)
+#if !CONFIG_IS_ENABLED(OF_PLATDATA_RT)
 	ofnode node_;
 #endif
 #ifdef CONFIG_DEVRES
@@ -174,6 +174,21 @@ struct udevice {
 #endif
 };
 
+/**
+ * udevice_rt - runtime information set up by U-Boot
+ *
+ * This is only used with OF_PLATDATA_RT
+ *
+ * There is one of these for every udevice in the linker list, indexed by
+ * the udevice_info idx value.
+ *
+ * @flags_: Flags for this device DM_FLAG_... (do not access outside driver
+ *	model)
+ */
+struct udevice_rt {
+	u32 flags_;
+};
+
 /* Maximum sequence number supported */
 #define DM_MAX_SEQ	999
 
-- 
2.29.2.729.g45daf8777d-goog