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devicetree: add DT_COMPAT_ON_BUS()

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And implement DT_ANY_INST_ON_BUS() in terms of it.

This makes some error messages quite a bit shorter by avoiding
UTIL_LISTIFY(), which has a nasty temper and tends to explode if not
treated gently.

Signed-off-by: Martí Bolívar <marti.bolivar@nordicsemi.no>
This commit is contained in:
Martí Bolívar 2020-03-25 14:18:27 -07:00 • committed by Kumar Gala
commit a3fae2f153
7 changed files with 100 additions and 30 deletions
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38
include/devicetree.h
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@ -1036,6 +1036,31 @@
*/
#define DT_ON_BUS(node_id, bus) IS_ENABLED(DT_CAT(node_id, _BUS_##bus))
/**
* @brief Test if any node of a compatible is on a bus of a given type
*
* Example devicetree overlay:
*
* &i2c0 {
* temp: temperature-sensor@76 {
* compatible = "vnd,some-sensor";
* reg = <0x76>;
* };
* };
*
* Example usage, assuming "i2c0" is an I2C bus controller node, and
* therefore "temp" is on an I2C bus:
*
* DT_COMPAT_ON_BUS(vnd_some_sensor, i2c) // 1
*
* @param compat lowercase-and-underscores version of a compatible
* @param bus a binding's bus type as a C token, lowercased and without quotes
* @return 1 if any enabled node with that compatible is on that bus type,
* 0 otherwise
*/
#define DT_COMPAT_ON_BUS(compat, bus) \
IS_ENABLED(UTIL_CAT(DT_CAT(DT_COMPAT_, compat), _BUS_##bus))
/**
* @}
*/
@ -1319,17 +1344,10 @@
/**
* @brief Test if any node with compatible DT_DRV_COMPAT is on a bus
*
* This is the same as logically ORing together DT_ON_BUS(node, bus)
* for every enabled node which matches compatible DT_DRV_COMPAT.
*
* It can be useful, for instance, when writing device drivers for
* hardware that supports multiple possible bus connections to the
* SoC.
*
* This is equivalent to DT_COMPAT_ON_BUS(DT_DRV_COMPAT, bus).
* @param bus a binding's bus type as a C token, lowercased and without quotes
*/
#define DT_ANY_INST_ON_BUS(bus) \
(UTIL_LISTIFY(DT_NUM_INST(DT_DRV_COMPAT), DT_INST_ON_BUS_OR, bus) 0)
#define DT_ANY_INST_ON_BUS(bus) DT_COMPAT_ON_BUS(DT_DRV_COMPAT, bus)
/**
* @def DT_INST_FOREACH
@ -1445,8 +1463,6 @@
#define DT_DASH(...) MACRO_MAP_CAT(DT_DASH_PREFIX, __VA_ARGS__)
/** @internal helper for DT_DASH(): prepends _ to a name */
#define DT_DASH_PREFIX(name) _##name
/** @internal DT_ANY_INST_ON_BUS helper */
#define DT_INST_ON_BUS_OR(inst, bus) DT_ON_BUS(DT_DRV_INST(inst), bus) ||
/** @internal DT_INST_FOREACH helper */
#define DT_CALL_WITH_ARG(arg, expr) expr(arg);