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

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Date:   Tue, 29 Nov 2022 11:40:12 +0000
From:   Biju Das <biju.das.jz@...renesas.com>
To:     Tomi Valkeinen <tomi.valkeinen+renesas@...asonboard.com>,
        Laurent Pinchart <laurent.pinchart@...asonboard.com>
CC:     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



> -----Original Message-----
> From: Tomi Valkeinen <tomi.valkeinen+renesas@...asonboard.com>
> Sent: 29 November 2022 11:30
> To: Laurent Pinchart <laurent.pinchart@...asonboard.com>
> Cc: 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; linux-renesas-soc@...r.kernel.org;
> devicetree@...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
> 
> On 29/11/2022 03:49, Laurent Pinchart wrote:
> > Hi Tomi,
> >
> > Thank you for the patch.
> >
> > 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>
> >> ---
> >>   drivers/gpu/drm/rcar-du/rcar_mipi_dsi.c      | 484 +++++++++++++++-
> ---
> >>   drivers/gpu/drm/rcar-du/rcar_mipi_dsi_regs.h |   6 +-
> >>   2 files changed, 384 insertions(+), 106 deletions(-)
> >>
> >> diff --git a/drivers/gpu/drm/rcar-du/rcar_mipi_dsi.c
> >> b/drivers/gpu/drm/rcar-du/rcar_mipi_dsi.c
> >> index a7f2b7f66a17..723c35726c38 100644
> >> --- 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??

Cheers,
Biju