From: Mark Brown <broonie@kernel.org>
Date: Wed, 15 Oct 2025 10:32:54 +0000 (+0100)
Subject: spi: aspeed: Improve clock, timing and address
X-Git-Tag: v6.19-rc1~150^2~32
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=7d9c2924f61dcabcbc5868bec6054ab4f4de01d1;p=thirdparty%2Fkernel%2Flinux.git

spi: aspeed: Improve clock, timing and address

Merge series from Chin-Ting Kuo <chin-ting_kuo@aspeedtech.com>:

This patch series introduces several improvements to the
ASPEED SPI driver, targeting better stability, compatibility
and, flexibility across multiple ASPEED platforms.

Key changes include:

* Clock selection strategy update
  Improves fallback logic when timing calibration is skipped or
  fails, ensuring reliable boot behavior.

* Timing calibration enhancement for AST2600
  Replaces the previous "first-pass" strategy with a more robust
  algorithm that selects the optimal timing point.

* Default address decoding assignment
  Ensures each chip select (CS) has a valid decoding range during
  probe, avoiding detection failures due to missing or incorrect
  bootloader setup.

* Centralized address decoding management
  Refactors the decoding logic to centrally assign address windows,
  preventing improper trimming and improving layout flexibility.

* Per-platform decoding adjustment
  Introduces platform-specific `adjust_window` callbacks to handle
  platform specific hardware constraints for address decoding range.

* Selective memory mapping
  Optimizes memory usage by mapping only the required address window
  per CS to avoid exhaustion.
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7d9c2924f61dcabcbc5868bec6054ab4f4de01d1