linux-kernel - [PATCH v3 0/6] Rework realtek-rtl IRQ driver

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Date:   Sun,  9 Jan 2022 15:54:31 +0100
From:   Sander Vanheule <sander@...nheule.net>
To:     linux-kernel@...r.kernel.org, devicetree@...r.kernel.org
Cc:     Thomas Gleixner <tglx@...utronix.de>,
        Marc Zyngier <maz@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Birger Koblitz <mail@...ger-koblitz.de>,
        Bert Vermeulen <bert@...t.com>,
        John Crispin <john@...ozen.org>,
        Sander Vanheule <sander@...nheule.net>
Subject: [PATCH v3 0/6] Rework realtek-rtl IRQ driver

After seeing some use, and with more devices tested, the current implementation
for the Realtek SoC interrupt controller was found to contain a few flaws.

The driver requires the following fixes:
- irq_domain_ops::map should map the virq, not the hwirq
- routing has an off-by-one error. Routing values (1..6) correspond to MIPS CAUSEF(2..7)

The following improvements should also be made:
- Use N real cascaded interrupts with an interrupt-specific mask of child irq lines.
  Otherwise a high-priority interrupt may cause a low-priority interrupt to be
  handled first.
- Get rid of assumed routing to parent interrupts of the original implementation.

Changes since v2 (RFC):
Link: https://lore.kernel.org/all/cover.1640548009.git.sander@svanheule.net/

- Define new, two-part compatibles for devicetree bindings. The existing format
  is kept for the old one-part compatible, but deprecated. New compatibles will
  require a different way of specifying parent interrupts and interrupt routing.
- Add change to handle all pending SoC interrupts in one go.

Changes since v1 (RFC):
Link: https://lore.kernel.org/all/cover.1640261161.git.sander@svanheule.net/

- Split some of the changes to limit the patch scope to one issue.
- Dropped some small (spurious or unneeded) changes
- Instead of dropping/replacing interrupt-map, the last patches now provide an
  implementation that amends the current situtation.

Sander Vanheule (6):
  irqchip/realtek-rtl: map control data to virq
  irqchip/realtek-rtl: fix off-by-one in routing
  irqchip/realtek-rtl: clear all pending interrupts
  dt-bindings: interrupt-controller: realtek,rtl-intc: require parents
  irqchip/realtek-rtl: use parent interrupts
  irqchip/realtek-rtl: use per-parent domains

 .../realtek,rtl-intc.yaml                     |  78 ++++--
 drivers/irqchip/irq-realtek-rtl.c             | 235 ++++++++++++------
 2 files changed, 222 insertions(+), 91 deletions(-)

-- 
2.33.1