linux-kernel - Re: [PATCH v4 6/6] drm/sprd: add Unisoc's drm mipi dsi&dphy driver

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Message-ID: <20210407104854.fgn67pvau7dchcm2@gilmour>
Date:   Wed, 7 Apr 2021 12:48:54 +0200
From:   Maxime Ripard <maxime@...no.tech>
To:     Kevin Tang <kevin3.tang@...il.com>
Cc:     Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        Sean Paul <sean@...rly.run>, David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Orson Zhai <orsonzhai@...il.com>,
        Chunyan Zhang <zhang.lyra@...il.com>,
        "Linux-Kernel@...r. Kernel. Org" <linux-kernel@...r.kernel.org>,
        ML dri-devel <dri-devel@...ts.freedesktop.org>,
        devicetree@...r.kernel.org
Subject: Re: [PATCH v4 6/6] drm/sprd: add Unisoc's drm mipi dsi&dphy driver

On Wed, Mar 31, 2021 at 09:47:12AM +0800, Kevin Tang wrote:
> > > diff --git a/drivers/gpu/drm/sprd/Makefile
> > b/drivers/gpu/drm/sprd/Makefile
> > > index 6c25bfa99..d49f4977b 100644
> > > --- a/drivers/gpu/drm/sprd/Makefile
> > > +++ b/drivers/gpu/drm/sprd/Makefile
> > > @@ -1,5 +1,8 @@
> > >  # SPDX-License-Identifier: GPL-2.0
> > >
> > >  obj-y := sprd_drm.o \
> > > -     sprd_dpu.o
> > > -
> > > +     sprd_dpu.o \
> > > +     sprd_dsi.o \
> > > +     dw_dsi_ctrl.o \
> > > +     dw_dsi_ctrl_ppi.o \
> >
> > So it's a designware IP? There's a driver for it already that seems
> > fairly similar:
> > drivers/gpu/drm/bridge/synopsys/dw-mipi-dsi.c
> >
> Our dw dsi controller is not a standard synopsys ip, we have updated a lot
> on the basic ip version,
> the entire control register is different, i have cc to drm/bridge reviewers
> and maintainers.

You should make it more obvious then in a comment or in the name of the
driver. If it's fairly different from the original IP from Synopsys,
maybe you should just drop the reference to the name?

Maxime

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