linux-kernel - Re: [PATCH v11] drm/bridge: add it6505 driver

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Date:   Mon, 31 Jan 2022 19:36:41 +0100
From:   Robert Foss <robert.foss@...aro.org>
To:     Hsin-Yi Wang <hsinyi@...omium.org>
Cc:     AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>,
        allen <allen.chen@....com.tw>,
        Kenneth Hung <Kenneth.Hung@....com.tw>,
        Jernej Skrabec <jernej.skrabec@...il.com>,
        Jau-Chih Tseng <Jau-Chih.Tseng@....com.tw>,
        David Airlie <airlied@...ux.ie>,
        "open list:DRM DRIVERS" <dri-devel@...ts.freedesktop.org>,
        Neil Armstrong <narmstrong@...libre.com>,
        open list <linux-kernel@...r.kernel.org>,
        Jonas Karlman <jonas@...boo.se>,
        Hermes Wu <Hermes.Wu@....com.tw>,
        Laurent Pinchart <laurent.pinchart@...asonboard.com>,
        Andrzej Hajda <andrzej.hajda@...el.com>,
        Hsin-Yi Wang <hsinyi@...gle.com>
Subject: Re: [PATCH v11] drm/bridge: add it6505 driver

On Mon, 31 Jan 2022 at 17:55, Hsin-Yi Wang <hsinyi@...omium.org> wrote:
>
> On Tue, Feb 1, 2022 at 12:37 AM Robert Foss <robert.foss@...aro.org> wrote:
> >
> > On Thu, 20 Jan 2022 at 16:25, AngeloGioacchino Del Regno
> > <angelogioacchino.delregno@...labora.com> wrote:
> > >
> > > Il 14/01/22 10:14, allen ha scritto:
> > > > This adds support for the iTE IT6505.
> > > > This device can convert DPI signal to DP output.
> > > >
> > > > From: Allen Chen <allen.chen@....com.tw>
> > > > Tested-by: Hsin-yi Wang <hsinyi@...omium.org>
> > > > Signed-off-by: Hermes Wu <hermes.wu@....com.tw>
> > > > Signed-off-by: Allen Chen <allen.chen@....com.tw>
> > > > ---
> > > > v10 -> v11 : remove drm_bridge_new_crtc_state
> > > > ---
> > > >   drivers/gpu/drm/bridge/Kconfig      |    8 +
> > > >   drivers/gpu/drm/bridge/Makefile     |    1 +
> > > >   drivers/gpu/drm/bridge/ite-it6505.c | 3352 +++++++++++++++++++++++++++
> > > >   3 files changed, 3361 insertions(+)
> > > >   create mode 100644 drivers/gpu/drm/bridge/ite-it6505.c
> > > >
> > >
> > > ...snip...
> > >
> > > > +static const struct of_device_id it6505_of_match[] = {
> > > > +     { .compatible = "ite,it6505" },
> > > > +     { }
> > > > +};
> > >
> > > If you want to have a DT compatible and DT properties, you have to also add
> > > dt-bindings (yaml) for this driver, otherwise, any SoC/device DT will fail
> > > the dt binding check.... So, please, add that.
> >
> > Let me second this. A dt-binding is needed for this driver to be
> > complete, it functions as both documentation and a way to test the DTS
> > that use this device, so it is really important.
> >
> The binding seems to be accepted before the driver:
> https://elixir.bootlin.com/linux/v5.16.4/source/Documentation/devicetree/bindings/display/bridge/ite,it6505.yaml

I completely missed that. In that case we're only missing the
reviewed-by tag from someone.

>
> > >
> > > For the driver by itself, though:
> > >
> > > Acked-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>
> > >
> > > > +
> > > > +static struct i2c_driver it6505_i2c_driver = {
> > > > +     .driver = {
> > > > +             .name = "it6505",
> > > > +             .of_match_table = it6505_of_match,
> > > > +             .pm = &it6505_bridge_pm_ops,
> > > > +     },
> > > > +     .probe = it6505_i2c_probe,
> > > > +     .remove = it6505_i2c_remove,
> > > > +     .shutdown = it6505_shutdown,
> > > > +     .id_table = it6505_id,
> > > > +};
> > > > +
> > > > +module_i2c_driver(it6505_i2c_driver);
> > > > +
> > > > +MODULE_AUTHOR("Allen Chen <allen.chen@....com.tw>");
> > > > +MODULE_DESCRIPTION("IT6505 DisplayPort Transmitter driver");
> > > > +MODULE_LICENSE("GPL v2");
> > > >
> > >