linux-kernel - Re: [PATCH 05/15] ARM64: dts: Add R-Car Salvator-x M3-N support

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Date:   Wed, 14 Feb 2018 14:58:34 +0100
From:   Geert Uytterhoeven <geert@...ux-m68k.org>
To:     Jacopo Mondi <jacopo+renesas@...ndi.org>
Cc:     Simon Horman <horms@...ge.net.au>,
        Magnus Damm <magnus.damm@...il.com>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>, linux-arm-kernel@...ts.infradead.org,
        Linux-Renesas <linux-renesas-soc@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 05/15] ARM64: dts: Add R-Car Salvator-x M3-N support

Hi Jacopo,

On Tue, Feb 13, 2018 at 10:45 AM, Jacopo Mondi
<jacopo+renesas@...ndi.org> wrote:
> Add initial support for R-Car M3-N Salvator-x and r8a77965 SoC in
> device tree with cpg-mssr, reset and clock nodes.
>
> Add place-holder device nodes for all nodes referred by
> "salvator-common.dtsi"
>
> Signed-off-by: Jacopo Mondi <jacopo+renesas@...ndi.org>

Thanks for your patch!

Looks mostly fine to me.

P.S. scripts/dtc/dtx_diff arch/arm64/boot/dts/renesas/r8a7796{,5}-salvator-x.dtb
     is your friend.

>  arch/arm64/Kconfig.platforms                       |   6 +
>  arch/arm64/boot/dts/renesas/Makefile               |   1 +
>  .../arm64/boot/dts/renesas/r8a77965-salvator-x.dts |  30 ++
>  arch/arm64/boot/dts/renesas/r8a77965.dtsi          | 495 +++++++++++++++++++++
>  4 files changed, 532 insertions(+)
>  create mode 100644 arch/arm64/boot/dts/renesas/r8a77965-salvator-x.dts
>  create mode 100644 arch/arm64/boot/dts/renesas/r8a77965.dtsi

The maintainer will probably ask you to split this in three parts:
  - ARCH_R8A77965
  - r8a77965.dtsi
  - r8a77965-salvator-x.dts

> --- /dev/null
> +++ b/arch/arm64/boot/dts/renesas/r8a77965-salvator-x.dts
> @@ -0,0 +1,30 @@
> +// SPDX-License-Identifier: GPL-2.
> +/*
> + * Device Tree Source for the Salvator-X board

with R-Car M3-N

> + *
> + * Copyright (C) 2018 Jacopo Mondi <jacopo+renesas@...ndi.org>
> + */
> +
> +/dts-v1/;
> +#include "r8a77965.dtsi"
> +#include "salvator-x.dtsi"
> +
> +/ {
> +       model = "Renesas Salvator-X board based on r8a77965";
> +       compatible = "renesas,salvator-x", "renesas,r8a77965";
> +
> +       aliases {
> +               serial0 = &scif2;
> +       };
> +
> +       chosen {
> +               bootargs = "ignore_loglevel rw root=/dev/nfs ip=dhcp";
> +               stdout-path = "serial0:115200n8";
> +       };

Both aliases and chosen are already defined in salvator-common.dtsi,
included via salvator-x.dtsi.

> --- /dev/null
> +++ b/arch/arm64/boot/dts/renesas/r8a77965.dtsi
> @@ -0,0 +1,495 @@
> +// SPDX-License-Identifier: GPL-2.
> +/*
> + * Device Tree Source for the r8a77965 SoC
> + *
> + * Copyright (C) 2018 Jacopo Mondi <jacopo+renesas@...ndi.org>
> + *
> + * Based on r8a7796.dtsi
> + * Copyright (C) 2016 Renesas Electronics Corp.
> + */
> +
> +#include <dt-bindings/clock/r8a77965-cpg-mssr.h>
> +#include <dt-bindings/interrupt-controller/arm-gic.h>
> +#include <dt-bindings/power/r8a77965-sysc.h>
> +
> +#define CPG_AUDIO_CLK_I                R8A77965_CLK_S0D4
> +
> +/ {

> +       soc {
> +               compatible = "simple-bus";
> +               interrupt-parent = <&gic>;
> +               #address-cells = <2>;
> +               #size-cells = <2>;
> +               ranges;

> +               timer {
> +                       compatible = "arm,armv8-timer";
> +                       interrupts = <GIC_PPI 13
> +                                       (GIC_CPU_MASK_SIMPLE(2) | IRQ_TYPE_LEVEL_LOW)>,
> +                                    <GIC_PPI 14
> +                                       (GIC_CPU_MASK_SIMPLE(2) | IRQ_TYPE_LEVEL_LOW)>,
> +                                    <GIC_PPI 11
> +                                       (GIC_CPU_MASK_SIMPLE(2) | IRQ_TYPE_LEVEL_LOW)>,
> +                                    <GIC_PPI 10
> +                                       (GIC_CPU_MASK_SIMPLE(2) | IRQ_TYPE_LEVEL_LOW)>;
> +               };

Please move the timer out of the soc node, as it does't have a unit address
and a reg property.

> +               pmu_a57 {
> +                       compatible = "arm,cortex-a57-pmu";
> +                       interrupts = <GIC_SPI 72 IRQ_TYPE_LEVEL_HIGH>,
> +                                    <GIC_SPI 73 IRQ_TYPE_LEVEL_HIGH>;
> +                       interrupt-affinity = <&a57_0>,
> +                                            <&a57_1>;
> +               };

Please move the pmu out of the soc node, as it does't have a unit address
and a reg property.

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