[U-Boot] [PATCH v3 01/12] drivers: core: device: add support to check dt compatible for a device/machine

[Mugunthan V N]

Provide an api to check whether the given device or machine is
compatible with the given compat string which helps in making
decisions in drivers based on device or machine compatible.

Idea taken from Linux.

Signed-off-by: Mugunthan V N <mugunthanvnm at ti.com>
Reviewed-by: Joe Hershberger <joe.hershberger at ni.com>
---
 drivers/core/device.c | 14 ++++++++++++++
 include/dm/device.h   | 23 +++++++++++++++++++++++
 2 files changed, 37 insertions(+)

diff --git a/drivers/core/device.c b/drivers/core/device.c
index 1322991..8fdd193 100644
--- a/drivers/core/device.c
+++ b/drivers/core/device.c
@@ -715,3 +715,17 @@ int device_set_name(struct udevice *dev, const char *name)
 
 	return 0;
 }
+
+bool of_device_is_compatible(struct udevice *dev, const char *compat)
+{
+	const void *fdt = gd->fdt_blob;
+
+	return !fdt_node_check_compatible(fdt, dev->of_offset, compat);
+}
+
+bool of_machine_is_compatible(const char *compat)
+{
+	const void *fdt = gd->fdt_blob;
+
+	return !fdt_node_check_compatible(fdt, 0, compat);
+}
diff --git a/include/dm/device.h b/include/dm/device.h
index 8970fc0..cd18e82 100644
--- a/include/dm/device.h
+++ b/include/dm/device.h
@@ -532,6 +532,29 @@ bool device_is_last_sibling(struct udevice *dev);
 int device_set_name(struct udevice *dev, const char *name);
 
 /**
+ * of_device_is_compatible() - check if the device is compatible with the compat
+ *
+ * This allows to check whether the device is comaptible with the compat.
+ *
+ * @dev:	udevice pointer for which compatible needs to be verified.
+ * @compat:	Compatible string which needs to verified in the given
+ *		device
+ * @return true if OK, false if the compatible is not found
+ */
+bool of_device_is_compatible(struct udevice *dev, const char *compat);
+
+/**
+ * of_machine_is_compatible() - check if the machine is compatible with
+ *				the compat
+ *
+ * This allows to check whether the machine is comaptible with the compat.
+ *
+ * @compat:	Compatible string which needs to verified
+ * @return true if OK, false if the compatible is not found
+ */
+bool of_machine_is_compatible(const char *compat);
+
+/**
  * device_is_on_pci_bus - Test if a device is on a PCI bus
  *
  * @dev:	device to test
-- 
2.8.1.339.g3ad15fd