linux-kernel - Re: [PATCH 03/11] arm64: dts: renesas: hihope-common: Separate out Rev.2.0 specific into hihope-common-rev2.dtsi file

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Date:   Mon, 8 Jun 2020 15:59:11 +0100
From:   "Lad, Prabhakar" <prabhakar.csengg@...il.com>
To:     Geert Uytterhoeven <geert@...ux-m68k.org>
Cc:     Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>,
        Magnus Damm <magnus.damm@...il.com>,
        Rob Herring <robh+dt@...nel.org>,
        Linux-Renesas <linux-renesas-soc@...r.kernel.org>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 03/11] arm64: dts: renesas: hihope-common: Separate out
 Rev.2.0 specific into hihope-common-rev2.dtsi file

Hi Geert,

On Mon, Jun 8, 2020 at 3:47 PM Geert Uytterhoeven <geert@...ux-m68k.org> wrote:
>
> Hi Prabhakar,
>
> On Sun, Jun 7, 2020 at 8:41 PM Lad Prabhakar
> <prabhakar.mahadev-lad.rj@...renesas.com> wrote:
> > Separate out Rev.2.0 specific hardware changes into
> > hihope-common-rev2.dtsi file so that hihope-common.dtsi can be used
> > by all the variants for RZ/G2M[N] boards.
> >
> > Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
> > Reviewed-by: Marian-Cristian Rotariu <marian-cristian.rotariu.rb@...renesas.com>
>
> > --- /dev/null
> > +++ b/arch/arm64/boot/dts/renesas/hihope-common-rev2.dtsi
>
> Perhaps just hihope-rev2.dtsi, i.e. without the "common-"?
>
Yes makes sense.

> > @@ -0,0 +1,101 @@
> > +// SPDX-License-Identifier: GPL-2.0
> > +/*
> > + * Device Tree Source for the HiHope RZ/G2[MN] main board Rev.2.0 common
> > + * parts
> > + *
> > + * Copyright (C) 2020 Renesas Electronics Corp.
> > + */
> > +
> > +#include <dt-bindings/gpio/gpio.h>
> > +
> > +/ {
> > +       leds {
> > +               compatible = "gpio-leds";
> > +
> > +               bt_active_led {
> > +                       label = "blue:bt";
> > +                       gpios = <&gpio7  0 GPIO_ACTIVE_HIGH>;
> > +                       linux,default-trigger = "hci0-power";
> > +                       default-state = "off";
> > +               };
> > +
> > +               led0 {
> > +                       gpios = <&gpio6 11 GPIO_ACTIVE_HIGH>;
> > +               };
> > +
> > +               led1 {
> > +                       gpios = <&gpio6 12 GPIO_ACTIVE_HIGH>;
> > +               };
> > +
> > +               led2 {
> > +                       gpios = <&gpio6 13 GPIO_ACTIVE_HIGH>;
> > +               };
> > +
> > +               led3 {
> > +                       gpios = <&gpio0  0 GPIO_ACTIVE_HIGH>;
> > +               };
>
> led1, led2, and led3 are present on both, so I'd keep them in
> hihope-common.dtsi.
>
The leds defined in hihope-common-rev4.dtsi are as per the label names
on the schematics/board so that it's easier to identify the LED's by
name.

> > +
> > +               wlan_active_led {
> > +                       label = "yellow:wlan";
> > +                       gpios = <&gpio7  1 GPIO_ACTIVE_HIGH>;
> > +                       linux,default-trigger = "phy0tx";
> > +                       default-state = "off";
> > +               };
> > +       };
> > +
> > +       wlan_en_reg: regulator-wlan_en {
> > +               compatible = "regulator-fixed";
> > +               regulator-name = "wlan-en-regulator";
> > +               regulator-min-microvolt = <1800000>;
> > +               regulator-max-microvolt = <1800000>;
> > +               startup-delay-us = <70000>;
> > +
> > +               gpio = <&gpio_expander 1 GPIO_ACTIVE_HIGH>;
> > +               enable-active-high;
> > +       };
>
> Same for the WLAN regulator, especially as it is referenced from
> hihope-common.dtsi.
> As the GPIO  line differs between the two variants, you just need
> to add the gpio property in the revision-specific file.
>
Agreed will move this to common.

> > +};
> > +
> > +&hscif0 {
> > +       bluetooth {
> > +               compatible = "ti,wl1837-st";
> > +               enable-gpios = <&gpio_expander 2 GPIO_ACTIVE_HIGH>;
> > +       };
> > +};
>
> As node is small, and the GPIO line differs from the two variants,
> I think duplicating it in both revision-specific files is fine, though.
>
Agreed.

Cheers,
--Prabhakar

> 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