[net-next PATCH v2 10/14] device property: Introduce fwnode_get_id()

From: Calvin Johnson <calvin.johnson@oss.nxp.com>
To: Grant Likely <grant.likely@arm.com>,
	"Rafael J . Wysocki" <rafael@kernel.org>,
	Jeremy Linton <jeremy.linton@arm.com>,
	Andrew Lunn <andrew@lunn.ch>,
	Andy Shevchenko <andy.shevchenko@gmail.com>,
	Florian Fainelli <f.fainelli@gmail.com>,
	Russell King - ARM Linux admin <linux@armlinux.org.uk>,
	Cristi Sovaiala <cristian.sovaiala@nxp.com>,
	Florin Laurentiu Chiculita <florinlaurentiu.chiculita@nxp.com>,
	Ioana Ciornei <ioana.ciornei@nxp.com>,
	Madalin Bucur <madalin.bucur@oss.nxp.com>,
	Heikki Krogerus <heikki.krogerus@linux.intel.com>,
	Marcin Wojtas <mw@semihalf.com>,
	Pieter Jansen Van Vuuren <pieter.jansenvv@bamboosystems.io>,
	Jon <jon@solid-run.com>
Cc: linux.cj@gmail.com, Laurentiu Tudor <laurentiu.tudor@nxp.com>,
	Diana Madalina Craciun <diana.craciun@nxp.com>,
	linux-acpi@vger.kernel.org, linux-kernel@vger.kernel.org,
	linux-arm-kernel@lists.infradead.org, netdev@vger.kernel.org,
	Calvin Johnson <calvin.johnson@oss.nxp.com>,
	Andy Shevchenko <andriy.shevchenko@linux.intel.com>,
	Bartosz Golaszewski <bgolaszewski@baylibre.com>,
	Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>,
	Randy Dunlap <rdunlap@infradead.org>
Subject: [net-next PATCH v2 10/14] device property: Introduce fwnode_get_id()
Date: Tue, 15 Dec 2020 22:13:11 +0530	[thread overview]
Message-ID: <20201215164315.3666-11-calvin.johnson@oss.nxp.com> (raw)
In-Reply-To: <20201215164315.3666-1-calvin.johnson@oss.nxp.com>

Using fwnode_get_id(), get the reg property value for DT node
and get the _ADR object value for ACPI node.

Signed-off-by: Calvin Johnson <calvin.johnson@oss.nxp.com>
---

Changes in v2: None

 drivers/base/property.c  | 26 ++++++++++++++++++++++++++
 include/linux/property.h |  1 +
 2 files changed, 27 insertions(+)

diff --git a/drivers/base/property.c b/drivers/base/property.c
index 4c43d30145c6..1c50e17ae879 100644
--- a/drivers/base/property.c
+++ b/drivers/base/property.c
@@ -580,6 +580,32 @@ const char *fwnode_get_name_prefix(const struct fwnode_handle *fwnode)
 	return fwnode_call_ptr_op(fwnode, get_name_prefix);
 }
 
+/**
+ * fwnode_get_id - Get the id of a fwnode.
+ * @fwnode: firmware node
+ * @id: id of the fwnode
+ *
+ * Returns 0 on success or a negative errno.
+ */
+int fwnode_get_id(struct fwnode_handle *fwnode, u32 *id)
+{
+	unsigned long long adr;
+	acpi_status status;
+
+	if (is_of_node(fwnode)) {
+		return of_property_read_u32(to_of_node(fwnode), "reg", id);
+	} else if (is_acpi_node(fwnode)) {
+		status = acpi_evaluate_integer(ACPI_HANDLE_FWNODE(fwnode),
+					       METHOD_NAME__ADR, NULL, &adr);
+		if (ACPI_FAILURE(status))
+			return -ENODATA;
+		*id = (u32)adr;
+		return 0;
+	}
+	return -EINVAL;
+}
+EXPORT_SYMBOL_GPL(fwnode_get_id);
+
 /**
  * fwnode_get_parent - Return parent firwmare node
  * @fwnode: Firmware whose parent is retrieved
diff --git a/include/linux/property.h b/include/linux/property.h
index 2d4542629d80..92d405cf2b07 100644
--- a/include/linux/property.h
+++ b/include/linux/property.h
@@ -82,6 +82,7 @@ struct fwnode_handle *fwnode_find_reference(const struct fwnode_handle *fwnode,
 
 const char *fwnode_get_name(const struct fwnode_handle *fwnode);
 const char *fwnode_get_name_prefix(const struct fwnode_handle *fwnode);
+int fwnode_get_id(struct fwnode_handle *fwnode, u32 *id);
 struct fwnode_handle *fwnode_get_parent(const struct fwnode_handle *fwnode);
 struct fwnode_handle *fwnode_get_next_parent(
 	struct fwnode_handle *fwnode);
-- 
2.17.1

