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include: devicetree.h: API for /chosen zephyr,foo

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Add a devicetree/zephyr.h header, which is meant to contain
definitions for /chosen properties specific to Zephyr.

Currently, this just deals with zephyr,entropy.  We add a
DT_CHOSEN_ZEPHYR_ENTROPY_LABEL macro which expands to the label for the
node pointed to by zephyr,entropy.

Signed-off-by: Martí Bolívar <marti.bolivar@nordicsemi.no>
Signed-off-by: Kumar Gala <kumar.gala@linaro.org>
This commit is contained in:
Martí Bolívar 2020-03-28 16:19:14 -07:00 • committed by Kumar Gala
commit ffd1abde66
4 changed files with 60 additions and 1 deletions
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1
include/devicetree.h
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@ -1492,5 +1492,6 @@
#include <devicetree/gpio.h>
#include <devicetree/spi.h>
#include <devicetree/dma.h>
#include <devicetree/zephyr.h>
#endif /* DEVICETREE_H */

48
include/devicetree/zephyr.h Normal file
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@ -0,0 +1,48 @@
/*
* Copyright (c) 2020 Nordic Semiconductor ASA
*
* SPDX-License-Identifier: Apache-2.0
*/
/**
* @file
* @brief Zephyr-specific devicetree /chosen properties
*/
#ifndef ZEPHYR_INCLUDE_DEVICETREE_ZEPHYR_H_
#define ZEPHYR_INCLUDE_DEVICETREE_ZEPHYR_H_
/**
* @defgroup devicetree-zephyr Zephyr's /chosen nodes
* @{
*/
/*
* This file is currently deliberately not defining macros for some
* existing zephyr,foo chosen nodes, such as zephyr,sram, until there
* are users for them. Feel free to extend it as needed.
*
* Getting doxygen to play along with all the dts-specific ifdeffery
* proved too complex for DT_CHOSEN_ZEPHYR_ENTROPY_LABEL, so we document
* everything under a DT_DOXYGEN define.
*/
#ifdef DT_DOXYGEN
/**
* @def DT_CHOSEN_ZEPHYR_ENTROPY_LABEL
*
* @brief If there is a chosen node zephyr,entropy property which has
* a label property, that property's value. Undefined otherwise.
*/
#define DT_CHOSEN_ZEPHYR_ENTROPY_LABEL ""
#endif /* DT_DOXYGEN */
#if DT_NODE_HAS_PROP(DT_CHOSEN(zephyr_entropy), label)
#define DT_CHOSEN_ZEPHYR_ENTROPY_LABEL DT_LABEL(DT_CHOSEN(zephyr_entropy))
#endif
/**
* @}
*/
#endif