linux-kernel - Re: [PATCH v3 7/8] soc: renesas: Add support for Renesas RZ/N1 GPIO Interrupt Multiplexer

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Message-ID: <aM16-DDi7OVSRbjG@shikoro>
Date: Fri, 19 Sep 2025 17:47:04 +0200
From: Wolfram Sang <wsa+renesas@...g-engineering.com>
To: Herve Codina <herve.codina@...tlin.com>
Cc: Thomas Gleixner <tglx@...utronix.de>,
	Hoan Tran <hoan@...amperecomputing.com>,
	Linus Walleij <linus.walleij@...aro.org>,
	Bartosz Golaszewski <brgl@...ev.pl>, Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Geert Uytterhoeven <geert+renesas@...der.be>,
	Magnus Damm <magnus.damm@...il.com>,
	Saravana Kannan <saravanak@...gle.com>,
	Serge Semin <fancer.lancer@...il.com>,
	Phil Edworthy <phil.edworthy@...esas.com>,
	linux-gpio@...r.kernel.org, devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-renesas-soc@...r.kernel.org,
	Pascal Eberhard <pascal.eberhard@...com>,
	Miquel Raynal <miquel.raynal@...tlin.com>,
	Thomas Petazzoni <thomas.petazzoni@...tlin.com>
Subject: Re: [PATCH v3 7/8] soc: renesas: Add support for Renesas RZ/N1 GPIO
 Interrupt Multiplexer


> kind of:
>   static u8 reg_index[8] = {103, 104, 105, ... , 110};
> 
> Base on GIC IRQ number retrieve from the interrupt-map item, we search for
> the index in reg_index that match this number. The index found is the index
> used to access the register.
> 
> What do you think about this?

I sure like it better than a fixed ordering in DT. And the advantage
compared to subtracting 103 is that reg_index can be flexible in case we
want to support other SoCs than RZ/N1?


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