linux-kernel - Re: [PATCH v3 2/2] rockchip: rk3399: Add support for FriendlyARM NanoPi R4S

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Date:   Mon, 15 Mar 2021 19:13:41 +0100
From:   Geert Uytterhoeven <geert@...ux-m68k.org>
To:     Heiko Stübner <heiko@...ech.de>
Cc:     Robin Murphy <robin.murphy@....com>, CN_SZTL <cnsztl@...il.com>,
        Rob Herring <robh+dt@...nel.org>,
        Jagan Teki <jagan@...rulasolutions.com>,
        Chen-Yu Tsai <wens@...e.org>,
        David Bauer <mail@...id-bauer.net>,
        Uwe Kleine-König <uwe@...ine-koenig.org>,
        Johan Jonker <jbx6244@...il.com>,
        Michael Trimarchi <michael@...rulasolutions.com>,
        Marty Jones <mj8263788@...il.com>,
        Jensen Huang <jensenhuang@...endlyarm.com>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        "open list:ARM/Rockchip SoC..." <linux-rockchip@...ts.infradead.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        kernel test robot <lkp@...el.com>
Subject: Re: [PATCH v3 2/2] rockchip: rk3399: Add support for FriendlyARM
 NanoPi R4S

Hi Heiko,

On Mon, Mar 15, 2021 at 5:52 PM Heiko Stübner <heiko@...ech.de> wrote:
> Am Montag, 15. März 2021, 17:38:37 CET schrieb Geert Uytterhoeven:
> > On Mon, Mar 15, 2021 at 5:32 PM Robin Murphy <robin.murphy@....com> wrote:
> > > On 2021-03-13 13:22, CN_SZTL wrote:
> > > > Robin Murphy <robin.murphy@....com> 于2021年3月13日周六 下午7:55写道：
> > > >>
> > > >> On 2021-03-13 03:25, Tianling Shen wrote:
> > > >>> +     gpio-leds {
> > > >>> +             compatible = "gpio-leds";
> > > >>> +             pinctrl-0 = <&lan_led_pin>, <&sys_led_pin>, <&wan_led_pin>;
> > > >>> +             pinctrl-names = "default";
> > > >>> +
> > > >>> +             lan_led: led-0 {
> > > >>> +                     gpios = <&gpio1 RK_PA1 GPIO_ACTIVE_HIGH>;
> > > >>> +                     label = "nanopi-r4s:green:lan";
> > > >>> +             };
> > > >>> +
> > > >>> +             sys_led: led-1 {
> > > >>> +                     gpios = <&gpio0 RK_PB5 GPIO_ACTIVE_HIGH>;
> > > >>> +                     label = "nanopi-r4s:red:sys";
> > > >>> +                     default-state = "on";
> > > >>> +             };
> > > >>> +
> > > >>> +             wan_led: led-2 {
> > > >>> +                     gpios = <&gpio1 RK_PA0 GPIO_ACTIVE_HIGH>;
> > > >>> +                     label = "nanopi-r4s:green:wan";
> > > >>> +             };
> > >
> > > Nit: (apologies for overlooking it before) there isn't an obvious
> > > definitive order for the LEDs, but the order here is certainly not
> > > consistent with anything. The most logical would probably be sys, wan,
> >
> > Looks like alphabetical sort order to me ;-)
>
> yep ... led-0, led-1, led-2 looks pretty sorted ;-)

Actually I had "lan, sys, wan" in mind ;-)

> Generally I'd prefer sorting by node-names ... especially as the phandle
> is sort of optional for most things - and they sometimes come and go
> in dt-files.

The node names are sorted, too, as you've just pointed out...

Personally, I'm not so fond of the <foo>-%u node names, and prefer
<foo>-<function>.  With the former, it's way too easy to have a silent
override in your .dts(i) stack.
Cfr. commit 45f5d5a9e34d3fe4 ("arm64: dts: renesas: r8a77995: draak:
Fix backlight regulator name")

Gr{oetje,eeting}s,

                        Geert

-- 
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds