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rockchip: spl: add documentation for spl_node_to_boot_device()
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.tomsich@theobroma-systems.com> Reviewed-by: Simon Glass <sjg@chromium.org>
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#include <spl.h>
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#if CONFIG_IS_ENABLED(OF_CONTROL)
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/**
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* spl_node_to_boot_device() - maps from a DT-node to a SPL boot device
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* @node: of_offset of the node
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*
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* The SPL framework uses BOOT_DEVICE_... constants to identify its boot
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* sources. These may take on a device-specific meaning, depending on
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* what nodes are enabled in a DTS (e.g. BOOT_DEVICE_MMC1 may refer to
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* different controllers/block-devices, depending on which SD/MMC controllers
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* are enabled in any given DTS). This function maps from a DT-node back
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* onto a BOOT_DEVICE_... constant, considering the currently active devices.
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*
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* Returns
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* -ENOENT, if no device matching the node could be found
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* -ENOSYS, if the device matching the node can not be mapped onto a
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* SPL boot device (e.g. the third MMC device)
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* -1, for unspecified failures
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* a positive integer (from the BOOT_DEVICE_... family) on succes.
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*/
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static int spl_node_to_boot_device(int node)
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{
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struct udevice *parent;
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