MLK-16118-2 power: Add PD device lookup interface to power domain uclass

Add power_domain_lookup_name interface to power domain uclass to find
a power domain device by its DTB node name, not using its associated
client device.

Through this interface, we can operate the power domain devices directly.
This is needed for non-DM drivers.

Reviewed-by: Peng Fan <peng.fan@nxp.com>
Signed-off-by: Ye Li <ye.li@nxp.com>
(cherry picked from commit f5fcb1903d935c2e1037b6a1fc61f1c290818727)

2 files changed, 56 insertions, 1 deletions

diff --git a/drivers/power/domain/power-domain-uclass.c b/drivers/power/domain/power-domain-uclass.c
index 1847a492a37..ddb365742d9 100644
--- a/drivers/power/domain/power-domain-uclass.c
+++ b/drivers/power/domain/power-domain-uclass.c
@@ -3,11 +3,12 @@
  *
  * SPDX-License-Identifier: GPL-2.0
  */
-
 #include <common.h>
 #include <dm.h>
 #include <power-domain.h>
 #include <power-domain-uclass.h>
+#include <dm/uclass-internal.h>
+#include <dm/device-internal.h>
 
 DECLARE_GLOBAL_DATA_PTR;
 
@@ -31,6 +32,46 @@ static int power_domain_of_xlate_default(struct power_domain *power_domain,
 	return 0;
 }
 
+int power_domain_lookup_name(const char *name, struct power_domain *power_domain)
+{
+	struct udevice *dev;
+	struct power_domain_ops *ops;
+	int ret;
+
+	debug("%s(power_domain=%p name=%s)\n", __func__, power_domain, name);
+
+	ret = uclass_find_device_by_name(UCLASS_POWER_DOMAIN, name, &dev);
+	if (!ret) {
+		/* Probe the dev */
+		device_probe(dev);
+		ops = power_domain_dev_ops(dev);
+
+		power_domain->dev = dev;
+		if (ops->of_xlate)
+			ret = ops->of_xlate(power_domain, NULL);
+		else
+			ret = power_domain_of_xlate_default(power_domain, NULL);
+		if (ret) {
+			debug("of_xlate() failed: %d\n", ret);
+			return ret;
+		}
+
+		ret = ops->request(power_domain);
+		if (ret) {
+			debug("ops->request() failed: %d\n", ret);
+			return ret;
+		}
+
+		debug("%s ok: %s\n", __func__, dev->name);
+
+		return 0;
+	}
+
+	printf("%s fail: %s, ret = %d\n", __func__, name, ret);
+	return -EINVAL;
+}
+
+
 int power_domain_get(struct udevice *dev, struct power_domain *power_domain)
 {
 	struct ofnode_phandle_args args;
diff --git a/include/power-domain.h b/include/power-domain.h
index 10999790b56..7fa85640f98 100644
--- a/include/power-domain.h
+++ b/include/power-domain.h
@@ -1,5 +1,6 @@
 /*
  * Copyright (c) 2016, NVIDIA CORPORATION.
+ * Copyright 2017 NXP
  *
  * SPDX-License-Identifier: GPL-2.0
  */
@@ -76,6 +77,19 @@ struct power_domain {
 };
 
 /**
+ * power_domain_lookup_name - Lookup the power domain device by name and request it.
+ *
+ * This looks up and requests a provider power domain by using its device name. This
+ * skip the associated client device, but directly get the power domain device.
+ *
+ * @name:        The power domain device's name.
+ * @power_domain        A pointer to a power domain struct to initialize.
+ * @return 0 if OK, or a negative error code.
+ */
+
+int power_domain_lookup_name(const char *name, struct power_domain *power_domain);
+
+/**
  * power_domain_get - Get/request the power domain for a device.
  *
  * This looks up and requests a power domain. Each device is assumed to have