linux-kernel - Re: [PATCH 1/2] ARM: dts: STi: Fix aliases property name for STi boards

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Message-ID: <CABGGiszEcvKHGE54vOXPBUJeReAKbgmrxRyRxNfQQoL6D54GCw@mail.gmail.com>
Date:   Mon, 5 Mar 2018 09:28:08 -0600
From:   Rob Herring <robh@...nel.org>
To:     patrice.chotard@...com
Cc:     Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>, linux@...linux.org.uk,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        devicetree@...r.kernel.org,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        jslaby@...e.com, linux-serial@...r.kernel.org
Subject: Re: [PATCH 1/2] ARM: dts: STi: Fix aliases property name for STi boards

On Mon, Mar 5, 2018 at 9:00 AM,  <patrice.chotard@...com> wrote:
> From: Patrice Chotard <patrice.chotard@...com>
>
> Since dtc v1.4.6-9-gaadd0b65c987, aliases property name must
> be lowercase only.
> This allows to fix following warnings when compiling dtb
> with W=1 option :

I'm so glad to see fixes before the dtc update landed in the kernel tree!

> arch/arm/boot/dts/stih418-b2199.dtb: Warning (alias_paths): /aliases: aliases property name must include only lowercase and '-'
> arch/arm/boot/dts/stih407-b2120.dtb: Warning (alias_paths): /aliases: aliases property name must include only lowercase and '-'
> arch/arm/boot/dts/stih410-b2260.dtb: Warning (alias_paths): /aliases: aliases property name must include only lowercase and '-'
> arch/arm/boot/dts/stih410-b2120.dtb: Warning (alias_paths): /aliases: aliases property name must include only lowercase and '-'
>
> Signed-off-by: Patrice Chotard <patrice.chotard@...com>
> ---
>  arch/arm/boot/dts/stih407-b2120.dts | 4 ++--
>  arch/arm/boot/dts/stih410-b2120.dts | 4 ++--
>  arch/arm/boot/dts/stih410-b2260.dts | 4 ++--
>  arch/arm/boot/dts/stih418-b2199.dts | 4 ++--
>  4 files changed, 8 insertions(+), 8 deletions(-)
>
> diff --git a/arch/arm/boot/dts/stih407-b2120.dts b/arch/arm/boot/dts/stih407-b2120.dts
> index c8ad905d0309..fa1186af6574 100644
> --- a/arch/arm/boot/dts/stih407-b2120.dts
> +++ b/arch/arm/boot/dts/stih407-b2120.dts
> @@ -14,7 +14,7 @@
>         compatible = "st,stih407-b2120", "st,stih407";
>
>         chosen {
> -               bootargs = "console=ttyAS0,115200 clk_ignore_unused";
> +               bootargs = "console=ttyas0,115200 clk_ignore_unused";

The kernel change for this is an ABI breakage both DT <-> kernel and
kernel <-> userspace.

Really, if you are okay with doing this, you should change it to ttySx IMO.

>                 linux,stdout-path = &sbc_serial0;

And since you have this, you don't even need the console praram.

>         };
>
> @@ -24,7 +24,7 @@
>         };
>
>         aliases {
> -               ttyAS0 = &sbc_serial0;
> +               ttyas0 = &sbc_serial0;

The correct fix is use "serialN" for aliases.

I have a check for only known alias names which would give a better
warning, but David thought it was too restrictive.

>                 ethernet0 = &ethernet0;
>         };
>