linux-kernel - Re: [PATCH v4 1/4] dt-bindings: gpio: spacemit: add support for K1 SoC

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Message-ID: <20250218095540-GYA29065@gentoo>
Date: Tue, 18 Feb 2025 09:55:40 +0000
From: Yixun Lan <dlan@...too.org>
To: Linus Walleij <linus.walleij@...aro.org>
Cc: Rob Herring <robh@...nel.org>, Olof Johansson <olof@...om.net>,
	Bartosz Golaszewski <brgl@...ev.pl>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>, Conor Dooley <conor@...nel.org>,
	Paul Walmsley <paul.walmsley@...ive.com>,
	Palmer Dabbelt <palmer@...belt.com>, Yangyu Chen <cyy@...self.name>,
	Jisheng Zhang <jszhang@...nel.org>,
	Jesse Taube <mr.bossman075@...il.com>,
	Inochi Amaoto <inochiama@...look.com>,
	Icenowy Zheng <uwu@...nowy.me>,
	Meng Zhang <zhangmeng.kevin@...ux.spacemit.com>,
	linux-gpio@...r.kernel.org, devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-riscv@...ts.infradead.org
Subject: Re: [PATCH v4 1/4] dt-bindings: gpio: spacemit: add support for K1
 SoC

Hi Linus:

On 10:44 Tue 18 Feb     , Linus Walleij wrote:
> On Fri, Feb 14, 2025 at 12:54 PM Yixun Lan <dlan@...too.org> wrote:
> 
> > thanks for this very detail prototype! it works mostly, with one problem:
> >
> > how to map gpio correctly to the pin from pinctrl subsystem?
> >
> > for example, I specify gpio-ranges in dts, then
> >                 gpio0: gpio@...19000 {
> >                         compatible = "spacemit,k1-gpio";
> >                         reg = <0x0 0xd4019000 0x0 0x100>;
> >                         ...
> >                         gpio-ranges = <&pinctrl 0 0 96>;
> >                 };
> >
> >                 foo-gpios = <&gpio0 2 28 GPIO_ACTIVE_LOW>;
> >
> > It should get GPIO_92 ( 92 = 2 * 32 + 28), but turns out GPIO_28
> >
> > Probably there is something I missed...
> 
> No it's just me missing the complexity!
> 
> > to make the gpio part work, we need additional custom gpio-ranges parser,
> > which should similar to of_gpiochip_add_pin_range() in gpiolib-of.c
> > (at least gpio core need to adjust to call custom this function)
> 
> Let me send a patch set to bring threecell into the core instead,
> and see if it works for you!
> 
> I will post it real soon.
> 
can you check the v5 of the patch here [1]? which I just sent out yesterday
it does 1) implement xlate() 2) instroduce custom add_pin_page()
the gpio part works as I tested, the gpio irq probably need more testing

> Yours,
> Linus Walleij

[1] https://lore.kernel.org/spacemit/20250217-03-k1-gpio-v5-0-2863ec3e7b67@gentoo.org/

-- 
Yixun Lan (dlan)
Gentoo Linux Developer
GPG Key ID AABEFD55