On Tue, Nov 30, 2021 at 08:42:53AM +0000, Marc Zyngier wrote:

On Tue, 30 Nov 2021 02:31:52 +0000,
Shawn Guo [off-list ref] wrote:

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+ Maulik

On Mon, Nov 29, 2021 at 03:24:39PM +0000, Marc Zyngier wrote:
[...]

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@@ -430,6 +430,14 @@ config QCOM_PDC
 	  Power Domain Controller driver to manage and configure wakeup
 	  IRQs for Qualcomm Technologies Inc (QTI) mobile chips.
 
+config QCOM_MPM
+	bool "QCOM MPM"

Can't be built as a module?

The driver is implemented as a builtin_platform_driver().

This, on its own, shouldn't preclude the driver from being built as a
module. However, the config option only allows it to be built in. Why?

I just tried to build it as a module, and it seems that "irq_to_desc" is
only available for built-in build.

Yet another thing that you should not be using. The irqdomain code
gives you everything you need without having to resort to the
internals of the core IRQ infrastructure.

I see.  I should use irq_get_irq_data() rather than &desc->irq_data.

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Furthermore, why would you look up anywhere other than the wake-up
domain? My impression was that only these interrupts would require
being re-triggered.

Both domains have MPM pins that could wake up system.

Then why do you need two domains?

This is basically the same situation as qcom-pdc, and I have some
description about that in the commit log:

- For given SoC, a fixed number of MPM pins are supported, e.g. 96 pins
  on QCM2290.  Each of these MPM pins can be either a MPM_GIC pin or
  a MPM_GPIO pin. The mapping between MPM_GIC pin and GIC interrupt
  is defined by SoC, as well as the mapping between MPM_GPIO pin and
  GPIO number.  The former mapping can be found as the SoC data in this
  MPM driver, while the latter can be found as the msm_gpio_wakeirq_map[]
  in TLMM driver.

- Two irq domains are created for a single irq_chip to handle MPM_GIC
  and MPM_GPIO pins respectively, i.e. MPM_GIC domain and MPM_GPIO domain.
  The former is a child domain of GIC irq domain, while the latter is
  a parent domain of TLMM/GPIO irq domain.

Shawn