linux-kernel - [PATCH 0/6] spi: aspeed: Improve clock, timing and address decoding logic

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Message-ID: <20251001112605.1130723-1-chin-ting_kuo@aspeedtech.com>
Date: Wed, 1 Oct 2025 19:25:59 +0800
From: Chin-Ting Kuo <chin-ting_kuo@...eedtech.com>
To: <robh@...nel.org>, <krzk+dt@...nel.org>, <conor+dt@...nel.org>,
	<joel@....id.au>, <andrew@...econstruct.com.au>, <clg@...d.org>,
	<broonie@...nel.org>, <devicetree@...r.kernel.org>,
	<linux-arm-kernel@...ts.infradead.org>, <linux-aspeed@...ts.ozlabs.org>,
	<linux-kernel@...r.kernel.org>, <openbmc@...ts.ozlabs.org>,
	<linux-spi@...r.kernel.org>, <BMC-SW@...eedtech.com>
Subject: [PATCH 0/6] spi: aspeed: Improve clock, timing and address decoding logic

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.

Chin-Ting Kuo (6):
  spi: aspeed: Update clock selection strategy
  spi: aspeed: Improve timing calibration algorithm for AST2600 platform
  spi: aspeed: Force default address decoding range assignment for each
    CS
  spi: aspeed: Centralize address decoding region management
  spi: aspeed: Add per-platform adjust_window callback for decoding
    range
  spi: aspeed: Only map necessary address window region

 drivers/spi/spi-aspeed-smc.c | 644 ++++++++++++++++++++++++++---------
 1 file changed, 489 insertions(+), 155 deletions(-)

-- 
2.34.1