linux-kernel - Re: [PATCH v2 7/7] drm: rcar-du: dsi: Add r8a779g0 support

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Date:   Tue, 29 Nov 2022 12:49:27 +0100
From:   Geert Uytterhoeven <geert@...ux-m68k.org>
To:     Biju Das <biju.das.jz@...renesas.com>
Cc:     Tomi Valkeinen <tomi.valkeinen+renesas@...asonboard.com>,
        Laurent Pinchart <laurent.pinchart@...asonboard.com>,
        Kieran Bingham <kieran.bingham+renesas@...asonboard.com>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Geert Uytterhoeven <geert+renesas@...der.be>,
        Magnus Damm <magnus.damm@...il.com>,
        "dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>,
        "linux-renesas-soc@...r.kernel.org" 
        <linux-renesas-soc@...r.kernel.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Andrzej Hajda <andrzej.hajda@...el.com>,
        Neil Armstrong <neil.armstrong@...aro.org>,
        Robert Foss <robert.foss@...aro.org>,
        Jonas Karlman <jonas@...boo.se>,
        Jernej Skrabec <jernej.skrabec@...il.com>
Subject: Re: [PATCH v2 7/7] drm: rcar-du: dsi: Add r8a779g0 support

Hi Biju,

On Tue, Nov 29, 2022 at 12:40 PM Biju Das <biju.das.jz@...renesas.com> wrote:
> > From: Tomi Valkeinen <tomi.valkeinen+renesas@...asonboard.com>
> > On 29/11/2022 03:49, Laurent Pinchart wrote:
> > > On Wed, Nov 23, 2022 at 08:59:46AM +0200, Tomi Valkeinen wrote:
> > >> Add DSI support for r8a779g0. The main differences to r8a779a0 are in
> > >> the PLL and PHTW setups.
> > >>
> > >> Signed-off-by: Tomi Valkeinen
> > >> <tomi.valkeinen+renesas@...asonboard.com>

> > >> --- a/drivers/gpu/drm/rcar-du/rcar_mipi_dsi.c
> > >> +++ b/drivers/gpu/drm/rcar-du/rcar_mipi_dsi.c
> > >> @@ -9,6 +9,7 @@
> > >>   #include <linux/delay.h>
> > >>   #include <linux/io.h>
> > >>   #include <linux/iopoll.h>
> > >> +#include <linux/math64.h>
> > >>   #include <linux/module.h>
> > >>   #include <linux/of.h>
> > >>   #include <linux/of_device.h>
> > >> @@ -28,6 +29,20 @@
> > >>   #include "rcar_mipi_dsi.h"
> > >>   #include "rcar_mipi_dsi_regs.h"
> > >>
> > >> +#define MHZ(v) ((v) * 1000000u)
> > >
> > > Isn't the U suffix usually spelled in uppercase ? Same below.
> >
> > I couldn't find any coding style guidelines on that. I like the lower
> > case visually. The suffix stands out much clearer on 10000000u than on
> > 10000000U. But I can change it if you feel otherwise.
>
> https://elixir.bootlin.com/linux/v6.1-rc7/source/include/linux/units.h#L11
>
> Maybe you could add MHZ here??

Or use the existing MEGA? The metric system is soooo nice! ;-)

BTW, looks like the people adding definitions like

    #define MICROHZ_PER_HZ 1000000UL
    #define MILLIHZ_PER_HZ 1000UL

    #define MILLIWATT_PER_WATT 1000UL
    #define MICROWATT_PER_MILLIWATT 1000UL
    #define MICROWATT_PER_WATT 1000000UL

didn't grasp the full power...

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