linux-hardening - Re: [PATCH RESEND v5 7/8] arm64: dts: Add DTS for Marvell PXA1908 and samsung,coreprimevelte

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Date: Sat, 30 Sep 2023 00:05:41 +0200
From: Linus Walleij <linus.walleij@...aro.org>
To: Duje Mihanović <duje.mihanovic@...le.hr>
Cc: Robert Jarzmik <robert.jarzmik@...e.fr>, Bartosz Golaszewski <brgl@...ev.pl>, 
	Andy Shevchenko <andy@...nel.org>, Michael Turquette <mturquette@...libre.com>, 
	Stephen Boyd <sboyd@...nel.org>, Rob Herring <robh+dt@...nel.org>, 
	Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>, Conor Dooley <conor+dt@...nel.org>, 
	Lubomir Rintel <lkundrak@...sk>, Catalin Marinas <catalin.marinas@....com>, Will Deacon <will@...nel.org>, 
	Kees Cook <keescook@...omium.org>, Tony Luck <tony.luck@...el.com>, 
	"Guilherme G. Piccoli" <gpiccoli@...lia.com>, linux-gpio@...r.kernel.org, 
	linux-kernel@...r.kernel.org, linux-clk@...r.kernel.org, 
	devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org, 
	linux-hardening@...r.kernel.org, ~postmarketos/upstreaming@...ts.sr.ht, 
	phone-devel@...r.kernel.org, afaerber@...e.de, balejk@...fyz.cz
Subject: Re: [PATCH RESEND v5 7/8] arm64: dts: Add DTS for Marvell PXA1908 and samsung,coreprimevelte

On Fri, Sep 29, 2023 at 5:42 PM Duje Mihanović <duje.mihanovic@...le.hr> wrote:

> Add DTS for Marvell PXA1908 SoC and Samsung Galaxy Core Prime Value
> Edition LTE, a smartphone based on said SoC.
>
> Signed-off-by: Duje Mihanović <duje.mihanovic@...le.hr>
(...)

> +&pmx {
> +       pinctrl-single,gpio-range = <&range 55 55 0>,
> +                                   <&range 110 32 0>,
> +                                   <&range 52 1 0>;
> +
> +       pinctrl-names = "default";
> +       pinctrl-0 = <&board_pins_1 &board_pins_2 &board_pins_3>;
> +
> +       board_pins_1: pinmux-board-1 {
> +               pinctrl-single,pins = <
> +                       0x160 0
> +                       0x164 0
> +                       0x168 0
> +                       0x16c 0
> +               >;
> +               pinctrl-single,drive-strength = <0x1000 0x1800>;
> +               pinctrl-single,bias-pullup = <0x8000 0x8000 0 0xc000>;
> +               pinctrl-single,bias-pulldown = <0x8000 0x8000 0 0xa000>;
> +               pinctrl-single,input-schmitt = <0 0x30>;
> +               pinctrl-single,input-schmitt-enable = <0x40 0 0x40 0x40>;
> +               pinctrl-single,low-power-mode = <0x288 0x388>;
> +       };
(...)
> +                       pmx: pinmux@...00 {
> +                               compatible = "pinconf-single";

At least add a new binding for "marvell,pxa1908-padconf"
and use that like this:

compatible = "marvell,pxa1908-padconf", "pinconf-single";

When you use pinctrl-single you get the slightly opaque device
trees as seen above, so it's not something I'd recommend, I'd
rather write my own pin controller.

But it exists, so I can't say you can't use it. Not my choice.
I understand it is convenient.

It is possible to switch later, but only if you have a unique
pin controller compatible so please add that.

Yours,
Linus Walleij