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

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Date:   Tue, 9 Feb 2021 12:15:10 -0600
From:   Rob Herring <robh@...nel.org>
To:     Liu Ying <victor.liu@....com>
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 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).

Rob