pinctrl: Enable support for external GPIO interrupts
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Cover letter [PATCH 0/2] pinctrl: Enable support for external GPIO interrupts
Quoted 5 lines
From: Carlo Caione <[email protected]>
In Meson SoCs we have 8 independent GPIO interrupts that can be programmed to use any of the GPIOs in the chip as interrupt source.
Quoted 7 lines
These GPIOs are managed by GIC but they can be conditioned (and enabled) by some registers external to the GIC.
GPIOs |--[mux1 or mux2]--[polarity]--[filter]--[edge_select]--> GIC
The original work has been done by Beniamino. I cleaned it up, fixed a couple of bugs, added support for Meson8b and the fix for the .to_irq hook.
Hi Carlo, Linus,
I have another implementation idea about this subject, by using static GPIO-irq association in DT instead of using a very complex dynamic allocation.
The idea is to add a simple property :
irqs-gpios = <>
To map a GPIO to the irqs, then we can either use the DT irq mapping or use the gpiolib to_irq() if the gpio is in the table.
The relative drawback is that we will need DT changes to enable routing of a gpio to an IRQ, but the complete system is based on a DT description anyway.
In this case, we could use gpiochip_irqchip.
Do you think this structure would be acceptable ?
Neil
Quoted 20 lines
Beniamino Galvani (2):
pinctrl: meson: Enable GPIO IRQs
pinctrl: dt-binding: Extend meson documentation with GPIO IRQs support.../devicetree/bindings/pinctrl/meson,pinctrl.txt | 12 + drivers/pinctrl/Kconfig | 1 + drivers/pinctrl/meson/pinctrl-meson.c | 254 +++++++++++++++++++++ drivers/pinctrl/meson/pinctrl-meson.h | 18 +- drivers/pinctrl/meson/pinctrl-meson8.c | 36 +-- drivers/pinctrl/meson/pinctrl-meson8b.c | 36 +-- 6 files changed, 326 insertions(+), 31 deletions(-)Signature · 7 lines
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