From 6e43d1b19982b1756b7c607569d1778e556d6577 Mon Sep 17 00:00:00 2001
From: Simon Glass <sjg@chromium.org>
Date: Thu, 28 Dec 2017 13:14:15 -0700
Subject: [PATCH] dm: core: Add a function to look up a uclass by name

Each uclass has a driver name which we can use to look up the uclass. This
is useful for logging, where the uclass ID is used as the category.

Add a function to handle this, as well as a test.

Signed-off-by: Simon Glass <sjg@chromium.org>
---
 drivers/core/uclass.c | 14 ++++++++++++++
 include/dm/uclass.h   |  8 ++++++++
 test/dm/core.c        |  9 +++++++++
 3 files changed, 31 insertions(+)

diff --git a/drivers/core/uclass.c b/drivers/core/uclass.c
index f5e4067..1aedaa0 100644
--- a/drivers/core/uclass.c
+++ b/drivers/core/uclass.c
@@ -158,6 +158,20 @@ const char *uclass_get_name(enum uclass_id id)
 	return uc->uc_drv->name;
 }
 
+enum uclass_id uclass_get_by_name(const char *name)
+{
+	int i;
+
+	for (i = 0; i < UCLASS_COUNT; i++) {
+		struct uclass_driver *uc_drv = lists_uclass_lookup(i);
+
+		if (uc_drv && !strcmp(uc_drv->name, name))
+			return i;
+	}
+
+	return UCLASS_INVALID;
+}
+
 int uclass_find_device(enum uclass_id id, int index, struct udevice **devp)
 {
 	struct uclass *uc;
diff --git a/include/dm/uclass.h b/include/dm/uclass.h
index 709f661..3a01abc 100644
--- a/include/dm/uclass.h
+++ b/include/dm/uclass.h
@@ -128,6 +128,14 @@ int uclass_get(enum uclass_id key, struct uclass **ucp);
 const char *uclass_get_name(enum uclass_id id);
 
 /**
+ * uclass_get_by_name() - Look up a uclass by its driver name
+ *
+ * @name: Name to look up
+ * @returns the associated uclass ID, or UCLASS_INVALID if not found
+ */
+enum uclass_id uclass_get_by_name(const char *name);
+
+/**
  * uclass_get_device() - Get a uclass device based on an ID and index
  *
  * The device is probed to activate it ready for use.
diff --git a/test/dm/core.c b/test/dm/core.c
index 50ee41b..052bf8f 100644
--- a/test/dm/core.c
+++ b/test/dm/core.c
@@ -862,3 +862,12 @@ static int dm_test_device_get_uclass_id(struct unit_test_state *uts)
 	return 0;
 }
 DM_TEST(dm_test_device_get_uclass_id, DM_TESTF_SCAN_PDATA);
+
+static int dm_test_uclass_names(struct unit_test_state *uts)
+{
+	ut_asserteq_str("test", uclass_get_name(UCLASS_TEST));
+	ut_asserteq(UCLASS_TEST, uclass_get_by_name("test"));
+
+	return 0;
+}
+DM_TEST(dm_test_uclass_names, DM_TESTF_SCAN_PDATA);