In the expectation that the spl-boot-order code will eventually
gain use outside of mach-rockchip: let's add documentation on the
spl_node_to_boot_device() function, which is likely to become a
publicly exported function.
Signed-off-by: Philipp Tomsich <philipp.toms...@theobroma-systems.com>
---
arch/arm/mach-rockchip/spl-boot-order.c | 19 +++++++++++++++++++
1 file changed, 19 insertions(+)
diff --git a/arch/arm/mach-rockchip/spl-boot-order.c
b/arch/arm/mach-rockchip/spl-boot-order.c
index 4f78c72..0bb9a73 100644
--- a/arch/arm/mach-rockchip/spl-boot-order.c
+++ b/arch/arm/mach-rockchip/spl-boot-order.c
@@ -10,6 +10,25 @@
#include <spl.h>
#if CONFIG_IS_ENABLED(OF_CONTROL)
+/**
+ * spl_node_to_boot_device() - maps from a DT-node to a SPL boot device
+ * @node: of_offset of the node
+ *
+ * The SPL framework uses BOOT_DEVICE_... constants to identify its boot
+ * sources. These may take on a device-specific meaning, depending on
+ * what nodes are enabled in a DTS (e.g. BOOT_DEVICE_MMC1 may refer to
+ * different controllers/block-devices, depending on which SD/MMC controllers
+ * are enabled in any given DTS). This function maps from a DT-node back
+ * onto a BOOT_DEVICE_... constant, considering the currently active devices.
+ *
+ * Returns
+ * -ENOENT, if no device matching the node could be found
+ * -ENOSYS, if the device matching the node can not be mapped onto a
+ * SPL boot device (e.g. the third MMC device)
+ * -1, for unspecified failures
+ * a positive integer (from the BOOT_DEVICE_... family) on succes.
+ */
+
static int spl_node_to_boot_device(int node)
{
struct udevice *parent;
--
2.1.4
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