linux-kernel - Re: [PATCH v2 03/19] arm64: renesas: Update 'vsps' property

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Message-ID: <20190822100051.yhguosvfz3zzykze@uno.localdomain>
Date:   Thu, 22 Aug 2019 12:00:51 +0200
From:   Jacopo Mondi <jacopo@...ndi.org>
To:     Geert Uytterhoeven <geert@...ux-m68k.org>
Cc:     Jacopo Mondi <jacopo+renesas@...ndi.org>,
        Laurent Pinchart <laurent.pinchart@...asonboard.com>,
        Kieran Bingham <kieran.bingham+renesas@...asonboard.com>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        Koji Matsuoka <koji.matsuoka.xm@...esas.com>, muroya@....co.jp,
        VenkataRajesh.Kalakodima@...bosch.com,
        Harsha.ManjulaMallikarjun@...bosch.com,
        Linux-Renesas <linux-renesas-soc@...r.kernel.org>,
        DRI Development <dri-devel@...ts.freedesktop.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 03/19] arm64: renesas: Update 'vsps' property

Hi Geert,

On Wed, Aug 21, 2019 at 02:16:02PM +0200, Geert Uytterhoeven wrote:
> On Sat, Jul 6, 2019 at 4:07 PM Jacopo Mondi <jacopo+renesas@...ndi.org> wrote:
> > Update the 'vsps' property in the R-Car Gen3 SoC device tree files to
> > match what's in in the documentation example.
>
> double in (no worries, I'll fix that up myself)
>
> > Signed-off-by: Jacopo Mondi <jacopo+renesas@...ndi.org>
>
> Thanks!
>
> Reviewed-by: Geert Uytterhoeven <geert+renesas@...der.be>
> i.e. will queue in renesas-devel for v5.4.
>
> BTW, any plans to add channel indices to the vsps properties in the
> remaining DTS files?

According to what I read in the parsing 'vsps' proeprties parsing
routine rcar_du_vsps_init(), if the channel index is not specified, it
is defaulted to 0.

           /* Store the VSP pointer and pipe index in the CRTC. */
           rcdu->crtcs[i].vsp = &rcdu->vsps[j];
           rcdu->crtcs[i].vsp_pipe = cells >= 1 ? args.args[0] : 0;

The DU bindings documentation does not state that the channel index is
optional, so yes, it might be worth changing this and simplify the
parsing routing to always assume the channel index is there.

What does Laurent think? Is this worth the effort?

Thanks
   j

>
> 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

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