[PATCH v2 0/3] PBL: enable timeouts in read_poll_timeout macros

[Stefan Kerkmann <s.kerkmann@pengutronix.de>]

Without a time source the read_poll_timeout functions will deadlock in the PBL
if the break condition is never met. This series introduces the necessary
timing functions in the PBL for ARMv7 and ARMv8 based on the ARM architected
timer and enable their usage if available.

Signed-off-by: Stefan Kerkmann <s.kerkmann@pengutronix.de>
---
Changes in v2:
- Strictly guard the pbl timer support on 32bit ARM for ARMv7 only builds
- Link to v1: https://lore.kernel.org/r/20250121-feature-pbl-get-time-ns-v1-0-c3d493397846@pengutronix.de

To: Sascha Hauer <s.hauer@pengutronix.de>
To: "open list:BAREBOX" <barebox@lists.infradead.org>

---
Stefan Kerkmann (3):
      ARM64: lib64: pbl: implement get_time_ns and is_timeout
      ARM: lib32: pbl: implement get_time_ns and is_timeout
      pbl: introduce HAS_PBL_CLOCKSOURCE marker

 arch/arm/cpu/Kconfig                   |  2 ++
 arch/arm/lib32/Makefile                |  2 +-
 arch/arm/lib32/arm_architected_timer.c | 15 ++++++++++++++-
 arch/arm/lib64/delay.c                 | 17 +++++++++++++++--
 include/linux/iopoll.h                 |  2 +-
 pbl/Kconfig                            |  3 +++
 6 files changed, 36 insertions(+), 5 deletions(-)
---
base-commit: 4705656eeeaba0dd3617b69172328daf4dbf9060
change-id: 20250121-feature-pbl-get-time-ns-6d9e8874d582

Best regards,
--  
Stefan Kerkmann <s.kerkmann@pengutronix.de>