linux-kernel - Re: [PATCH v3 09/14] drm/bridge: imx: Add i.MX8qxp pixel link to DPI support

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Message-ID: <28cb279081ef09216de91bddaafe5be339a9601e.camel@nxp.com>
Date:   Thu, 18 Feb 2021 10:56:08 +0800
From:   Liu Ying <victor.liu@....com>
To:     Rob Herring <robh@...nel.org>
Cc:     dri-devel@...ts.freedesktop.org, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-media@...r.kernel.org, airlied@...ux.ie, daniel@...ll.ch,
        shawnguo@...nel.org, s.hauer@...gutronix.de, kernel@...gutronix.de,
        festevam@...il.com, linux-imx@....com, mchehab@...nel.org,
        a.hajda@...sung.com, narmstrong@...libre.com,
        Laurent.pinchart@...asonboard.com, jonas@...boo.se,
        jernej.skrabec@...l.net, kishon@...com, vkoul@...nel.org
Subject: Re: [PATCH v3 09/14] drm/bridge: imx: Add i.MX8qxp pixel link to
 DPI support

On Tue, 2021-02-09 at 12:15 -0600, Rob Herring wrote:
> On Wed, Jan 27, 2021 at 04:51:23PM +0800, Liu Ying wrote:
> > This patch adds a drm bridge driver for i.MX8qxp pixel link to display
> > pixel interface(PXL2DPI).  The PXL2DPI interfaces the pixel link 36-bit
> > data output and the DSI controller’s MIPI-DPI 24-bit data input, and
> > inputs of LVDS Display Bridge(LDB) module used in LVDS mode, to remap
> > the pixel color codings between those modules. The PXL2DPI is purely
> > combinatorial.
> > 
> > Signed-off-by: Liu Ying <victor.liu@....com>
> > ---
> > v2->v3:
> > * Call syscon_node_to_regmap() to get regmap instead of
> >   syscon_regmap_lookup_by_phandle().
> > 
> > v1->v2:
> > * Drop unnecessary port availability check.
> > 
> >  drivers/gpu/drm/bridge/imx/Kconfig           |   8 +
> >  drivers/gpu/drm/bridge/imx/Makefile          |   1 +
> >  drivers/gpu/drm/bridge/imx/imx8qxp-pxl2dpi.c | 488 +++++++++++++++++++++++++++
> >  3 files changed, 497 insertions(+)
> >  create mode 100644 drivers/gpu/drm/bridge/imx/imx8qxp-pxl2dpi.c
> > +	p2d->regmap = syscon_node_to_regmap(np->parent);
> > +	if (IS_ERR(p2d->regmap)) {
> > +		ret = PTR_ERR(p2d->regmap);
> > +		if (ret != -EPROBE_DEFER)
> > +			DRM_DEV_ERROR(dev, "failed to get regmap: %d\n", ret);
> > +		return ret;
> > +	}
> > +
> > +	p2d->id = of_alias_get_id(np, "pxl2dpi");
> 
> Don't add random aliases. I'd rather see a property in this node as long 
> as it is specific to what this is used for (and not a generic index).

Ok.  I'll use a DT property to get the SCU resource ID associated with
the PXL2DPI instance.  Thanks.

Liu Ying

> 
> Rob