linux-kernel - [PATCH v3 0/4] Add support for A7-A11 AIC

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Message-ID: <20240901034143.12731-1-towinchenmi@gmail.com>
Date: Sun,  1 Sep 2024 11:40:03 +0800
From: Nick Chan <towinchenmi@...il.com>
To: Hector Martin <marcan@...can.st>,
	Sven Peter <sven@...npeter.dev>,
	Alyssa Rosenzweig <alyssa@...enzweig.io>,
	Thomas Gleixner <tglx@...utronix.de>,
	Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>,
	asahi@...ts.linux.dev,
	linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org,
	devicetree@...r.kernel.org
Cc: ~postmarketos/upstreaming@...ts.sr.ht,
	konrad.dybcio@...ainline.org,
	Nick Chan <towinchenmi@...il.com>
Subject: [PATCH v3 0/4] Add support for A7-A11 AIC

Hi,

This patch series introduce support for A7-A11 SoCs into the AIC driver by
if'ing out some features unavailable on them. For background information
about these SoCs, see v1.

Changes since v2:
- Removed mention of the IPI-always-ack code path in aic_handle_fiq(). The
patch to enable A7-A10 SoC to work is a bug fix to avoid accessing sysregs
on configurations that do not provide them, and the rest of the message
already explains what's going on.

Changes since v1:

- Corrected dt-binding issues pointed out by Rob, all of A7-M1 gets its own
SoC compat, as well as the "apple,aic" generic fallback.

- Order the AIC dt-bindings of the SoCs by release dates instead of alphabetical
order: 's5l8960x' (A7) -> 't7000' (A8) -> 's8000' (A9) -> 't8010' (A10)
-> 't8015' (A11) -> 't8103' (M1)

- The patch to disallow local fast IPI on A11 now comes before the patch
that enables to AIC driver to work on slow IPI systems. This ensures all
IPI-always-ack code path in aic_handle_fiq() is removed by the slow IPI
patch.

- Keep local fast IPI enabled on AIC2, mistake in V1
- Describe the feature levels in the description of AIC.
- Add new patch to remove unneccessary enablement of use_fast_ipi.
- Do not try to enable use_local_fast_ipi, because it is enabled by default.

In theory M1 can also get the apple,t8015-aic (A11) compatible. However, I
do not see a point in doing that.

Previous versions:
v1: https://lore.kernel.org/asahi/20240829092610.89731-1-towinchenmi@gmail.com
v2: https://lore.kernel.org/asahi/20240831055605.3542-1-towinchenmi@gmail.com

Nick Chan

Konrad Dybcio (1):
  irqchip/apple-aic: Only access system registers on SoCs which provide
    them

Nick Chan (3):
  dt-bindings: apple,aic: Document A7-A11 compatibles
  irqchip/apple-aic: Skip unnecessary setting of use_fast_ipi
  irqchip/apple-aic: Add a new "Global fast IPIs only" feature level

 .../interrupt-controller/apple,aic.yaml       | 14 ++++-
 drivers/irqchip/irq-apple-aic.c               | 53 +++++++++++++------
 2 files changed, 49 insertions(+), 18 deletions(-)


base-commit: 985bf40edf4343dcb04c33f58b40b4a85c1776d4
-- 
2.46.0