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rockchip: spl: add documentation for spl_node_to_boot_device()

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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>
This commit is contained in:
Philipp Tomsich 2017-09-29 19:27:56 +02:00
parent 3b4f87735d
commit dbad01cab5
1 changed files with 19 additions and 0 deletions
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19
arch/arm/mach-rockchip/spl-boot-order.c
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@ -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;