[PATCH 3/6] misc: fs_loader: Add function to get the chosen loader

[Sean Anderson]

The fs_loader device is used to pull in settings via the chosen node.
However, there was no library function for this, so arria10 was doing it
explicitly. This function subsumes that, and uses ofnode_get_chosen_node
instead of navigating the device tree directly. Because fs_loader pulls
its config from the environment by default, it's fine to create a device
with nothing backing it at all. Doing this allows enabling
CONFIG_FS_LOADER without needing to modify the device tree.

Signed-off-by: Sean Anderson <sean.anderson at seco.com>
---

 arch/arm/mach-k3/common.c         |  2 +-
 arch/arm/mach-omap2/boot-common.c |  2 +-
 drivers/fpga/socfpga_arria10.c    | 24 ++----------------------
 drivers/misc/fs_loader.c          | 27 +++++++++++++++++++++++++++
 include/fs_loader.h               | 12 ++++++++++++
 5 files changed, 43 insertions(+), 24 deletions(-)

diff --git a/arch/arm/mach-k3/common.c b/arch/arm/mach-k3/common.c
index b4b75f4e6c..ec236d5a2e 100644
--- a/arch/arm/mach-k3/common.c
+++ b/arch/arm/mach-k3/common.c
@@ -181,7 +181,7 @@ int load_firmware(char *name_fw, char *name_loadaddr, u32 *loadaddr)
 	if (!*loadaddr)
 		return 0;
 
-	if (!uclass_get_device(UCLASS_FS_FIRMWARE_LOADER, 0, &fsdev)) {
+	if (!get_fs_loader(&fsdev)) {
 		size = request_firmware_into_buf(fsdev, name, (void *)*loadaddr,
 						 0, 0);
 	}
diff --git a/arch/arm/mach-omap2/boot-common.c b/arch/arm/mach-omap2/boot-common.c
index afc3585641..c82aadc7cc 100644
--- a/arch/arm/mach-omap2/boot-common.c
+++ b/arch/arm/mach-omap2/boot-common.c
@@ -212,7 +212,7 @@ int load_firmware(char *name_fw, u32 *loadaddr)
 	if (!*loadaddr)
 		return 0;
 
-	if (!uclass_get_device(UCLASS_FS_FIRMWARE_LOADER, 0, &fsdev)) {
+	if (!get_fs_loader(&fsdev)) {
 		size = request_firmware_into_buf(fsdev, name_fw,
 						 (void *)*loadaddr, 0, 0);
 	}
diff --git a/drivers/fpga/socfpga_arria10.c b/drivers/fpga/socfpga_arria10.c
index 798e3a3f90..65bebd8997 100644
--- a/drivers/fpga/socfpga_arria10.c
+++ b/drivers/fpga/socfpga_arria10.c
@@ -765,32 +765,12 @@ int socfpga_loadfs(fpga_fs_info *fpga_fsinfo, const void *buf, size_t bsize,
 	u32 phandle;
 
 	node = get_fpga_mgr_ofnode(ofnode_null());
-
-	if (ofnode_valid(node)) {
-		phandle_p = ofnode_get_property(node, "firmware-loader", &size);
-		if (!phandle_p) {
-			node = ofnode_path("/chosen");
-			if (!ofnode_valid(node)) {
-				debug("FPGA: /chosen node was not found.\n");
-				return -ENOENT;
-			}
-
-			phandle_p = ofnode_get_property(node, "firmware-loader",
-						       &size);
-			if (!phandle_p) {
-				debug("FPGA: firmware-loader property was not");
-				debug(" found.\n");
-				return -ENOENT;
-			}
-		}
-	} else {
+	if (!ofnode_valid(node)) {
 		debug("FPGA: FPGA manager node was not found.\n");
 		return -ENOENT;
 	}
 
-	phandle = fdt32_to_cpu(*phandle_p);
-	ret = uclass_get_device_by_phandle_id(UCLASS_FS_FIRMWARE_LOADER,
-					     phandle, &dev);
+	ret = get_fs_loader(&dev);
 	if (ret)
 		return ret;
 
diff --git a/drivers/misc/fs_loader.c b/drivers/misc/fs_loader.c
index 0139bd66ba..0018c930ec 100644
--- a/drivers/misc/fs_loader.c
+++ b/drivers/misc/fs_loader.c
@@ -15,6 +15,8 @@
 #include <fs_loader.h>
 #include <log.h>
 #include <asm/global_data.h>
+#include <dm/device-internal.h>
+#include <dm/root.h>
 #include <linux/string.h>
 #include <mapmem.h>
 #include <malloc.h>
@@ -293,6 +295,31 @@ U_BOOT_DRIVER(fs_loader) = {
 	.priv_auto	= sizeof(struct firmware),
 };
 
+static struct device_plat default_plat = { 0 };
+
+int get_fs_loader(struct udevice **dev)
+{
+	int ret;
+	ofnode node = ofnode_get_chosen_node("firmware-loader");
+
+	if (ofnode_valid(node))
+		return uclass_get_device_by_ofnode(UCLASS_FS_FIRMWARE_LOADER,
+						   node, dev);
+
+	/* Try the first device if none was chosen */
+	ret = uclass_first_device_err(UCLASS_FS_FIRMWARE_LOADER, dev);
+	if (ret != -ENODEV)
+		return ret;
+
+	/* Just create a new device */
+	ret = device_bind(dm_root(), DM_DRIVER_GET(fs_loader), "default-loader",
+			  &default_plat, ofnode_null(), dev);
+	if (ret)
+		return ret;
+
+	return device_probe(*dev);
+}
+
 UCLASS_DRIVER(fs_loader) = {
 	.id		= UCLASS_FS_FIRMWARE_LOADER,
 	.name		= "fs-loader",
diff --git a/include/fs_loader.h b/include/fs_loader.h
index 8de7cb18dc..5eb5b7ab4a 100644
--- a/include/fs_loader.h
+++ b/include/fs_loader.h
@@ -52,4 +52,16 @@ struct device_plat {
 int request_firmware_into_buf(struct udevice *dev,
 			      const char *name,
 			      void *buf, size_t size, u32 offset);
+
+/**
+ * get_fs_loader() - Get the chosen filesystem loader
+ * @dev: Where to store the device
+ *
+ * This gets a filesystem loader device based on the value of
+ * /chosen/firmware-loader. If no such property exists, it returns a
+ * firmware loader which is configured by environmental variables.
+ *
+ * Return: 0 on success, negative value on error
+ */
+int get_fs_loader(struct udevice **dev);
 #endif
-- 
2.25.1