From: Wolfram Sang <wsa+renesas@sang-engineering.com>
To: Linus Walleij <linus.walleij@linaro.org>
Cc: Herve Codina <herve.codina@bootlin.com>,
Thomas Gleixner <tglx@linutronix.de>,
Hoan Tran <hoan@os.amperecomputing.com>,
Bartosz Golaszewski <brgl@bgdev.pl>,
Rob Herring <robh@kernel.org>,
Krzysztof Kozlowski <krzk+dt@kernel.org>,
Conor Dooley <conor+dt@kernel.org>,
Geert Uytterhoeven <geert+renesas@glider.be>,
Magnus Damm <magnus.damm@gmail.com>,
Saravana Kannan <saravanak@google.com>,
Serge Semin <fancer.lancer@gmail.com>,
Phil Edworthy <phil.edworthy@renesas.com>,
linux-gpio@vger.kernel.org, devicetree@vger.kernel.org,
linux-kernel@vger.kernel.org, linux-renesas-soc@vger.kernel.org,
Pascal Eberhard <pascal.eberhard@se.com>,
Miquel Raynal <miquel.raynal@bootlin.com>,
Thomas Petazzoni <thomas.petazzoni@bootlin.com>
Subject: Re: [PATCH v4 7/8] soc: renesas: Add support for Renesas RZ/N1 GPIO Interrupt Multiplexer
Date: Tue, 14 Oct 2025 16:30:40 +0200 [thread overview]
Message-ID: <aO5ekPxeg7tdFlHi@shikoro> (raw)
In-Reply-To: <CACRpkdZ1qg6ecA5DyVEGUHQxLh0SnC=GC5JZdevT99YVWU0ypA@mail.gmail.com>
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Hi Linus,
giving some details about the HW until Herve can return to this topic.
> Are these IRQ lines ever muxed for anything else than
> GPIO? In that case go ahead with this solution, I guess.
> But the title of your patch seems to suggest it is
> only used by GPIO.
True, it only muxes 96 GPIOs to the 8 available irqs.
> If it is only used for GPIO, why make it a separate
> driver instead of just putting the muxing into the
> GPIO driver?
Because the HW design kind of suggests it, I'd think. The GPIO
controller is a standard Synopsis one ("snps,dw-apb-gpio") without any
extras. The GPIOMUX (which is extra) is according to the docs part of
the system controller with a dedicated set of registers. Luckily,
self-contained and not mangled with other functionality.
I am just stating where this comes from. I haven't looked into the
details of your suggestion. It may or may not make sense to add this to
the Synopsis driver with a dedicated compatible for RZ/N1D. I'll leave
this for Herve, though.
Happy hacking,
Wolfram
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next prev parent reply other threads:[~2025-10-14 14:30 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-09-22 15:26 [PATCH v4 0/8] gpio: renesas: Add support for GPIO and related interrupts in RZ/N1 SoC Herve Codina (Schneider Electric)
2025-09-22 15:26 ` [PATCH v4 1/8] of/irq: Introduce for_each_of_imap_item Herve Codina (Schneider Electric)
2025-09-22 15:26 ` [PATCH v4 2/8] of: unittest: Add a test case for for_each_of_imap_item iterator Herve Codina (Schneider Electric)
2025-09-22 15:26 ` [PATCH v4 3/8] irqchip/ls-extirq: Use " Herve Codina (Schneider Electric)
2025-09-22 15:26 ` [PATCH v4 4/8] irqchip/renesas-rza1: " Herve Codina (Schneider Electric)
2025-09-23 6:56 ` Wolfram Sang
2025-09-22 15:26 ` [PATCH v4 5/8] ARM: dts: r9a06g032: Add GPIO controllers Herve Codina (Schneider Electric)
2025-09-22 17:17 ` Bartosz Golaszewski
2025-09-22 15:26 ` [PATCH v4 6/8] dt-bindings: soc: renesas: Add the Renesas RZ/N1 GPIO Interrupt Multiplexer Herve Codina (Schneider Electric)
2025-09-24 8:07 ` Wolfram Sang
2025-09-24 20:56 ` Wolfram Sang
2025-09-22 15:26 ` [PATCH v4 7/8] soc: renesas: Add support for " Herve Codina (Schneider Electric)
2025-09-24 18:41 ` Wolfram Sang
2025-10-15 11:48 ` Herve Codina
2025-10-01 11:08 ` Linus Walleij
2025-10-01 15:42 ` Herve Codina
2025-10-13 10:49 ` Linus Walleij
2025-10-14 14:30 ` Wolfram Sang [this message]
2025-10-14 20:13 ` Linus Walleij
2025-10-15 6:21 ` Herve Codina
2025-09-22 15:26 ` [PATCH v4 8/8] ARM: dts: r9a06g032: Add support for GPIO interrupts Herve Codina (Schneider Electric)
2025-09-22 15:33 ` Bartosz Golaszewski
2025-09-24 21:48 ` Wolfram Sang
2025-10-15 9:41 ` Herve Codina
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