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From: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
To: Marek Vasut <marex@denx.de>
Cc: devicetree@vger.kernel.org, "Guido Günther" <agx@sigxcpu.org>,
	"Rob Herring" <robh+dt@kernel.org>,
	dri-devel@lists.freedesktop.org,
	"Pengutronix Kernel Team" <kernel@pengutronix.de>,
	linux-arm-kernel@lists.infradead.org
Subject: Re: [PATCH v2 1/7] dt-bindings: display: mxsfb: Convert binding to YAML
Date: Wed, 7 Oct 2020 16:33:57 +0300	[thread overview]
Message-ID: <20201007133357.GJ3937@pendragon.ideasonboard.com> (raw)
In-Reply-To: <a8db345a-24b3-db8c-8dce-f97e021a1bf1@denx.de>

Hi Marek,

On Wed, Oct 07, 2020 at 10:55:24AM +0200, Marek Vasut wrote:
> On 10/7/20 10:43 AM, Lucas Stach wrote:
> > On Mi, 2020-10-07 at 10:32 +0200, Marek Vasut wrote:
> >> On 10/7/20 3:24 AM, Laurent Pinchart wrote:
> >> [...]
> >>> +properties:
> >>> +  compatible:
> >>> +    enum:
> >>> +      - fsl,imx23-lcdif
> >>> +      - fsl,imx28-lcdif
> >>> +      - fsl,imx6sx-lcdif
> >>> +      - fsl,imx8mq-lcdif
> >>
> >> There is no fsl,imx8mq-lcdif in drivers/gpu/drm/mxsfb/mxsfb_drv.c,
> >> so the DT must specify compatible = "fsl,imx8mq-lcdif",
> >> "fsl,imx28-lcdif" (since imx28 is the oldest SoC with LCDIF V4).
> >>
> >> Should the compatible be added to drivers/gpu/drm/mxsfb/mxsfb_drv.c or
> >> dropped from the YAML file or neither ?
> > 
> > Neither. As far as we know the block is compatible, so the DT should
> > claim that it's compatible to "fsl,imx28-lcdif". However we don't know
> > if there are any surprises, so we add the SoC specific compatible to be
> > able to change the driver matching later without changing the DT if the
> > need arises. For the DT validation to pass the SoC specific compatible 
> > needs to be documented, even if it currently unused by the driver.
> 
> What in that binding says you should specify compatible =
> "fsl,imx8mq-lcdif", "fsl,imx28-lcdif"; and not e.g. "fsl,imx8mq-lcdif",
> "fsl,imx23-lcdif" or simply "fsl,imx8mq-lcdif" ?

Nothing, until the next patch :-) This patch only handles the YAML
conversion but doesn't fix issues.

-- 
Regards,

Laurent Pinchart
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  reply	other threads:[~2020-10-07 13:34 UTC|newest]

Thread overview: 28+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-10-07  1:24 [PATCH v2 0/7] drm: mxsfb: Allow overriding bus width Laurent Pinchart
2020-10-07  1:24 ` [PATCH v2 1/7] dt-bindings: display: mxsfb: Convert binding to YAML Laurent Pinchart
2020-10-07  8:32   ` Marek Vasut
2020-10-07  8:43     ` Lucas Stach
2020-10-07  8:55       ` Marek Vasut
2020-10-07 13:33         ` Laurent Pinchart [this message]
2020-10-07 14:20           ` Marek Vasut
2020-10-07 16:00   ` Rob Herring
2020-10-07 16:02     ` Rob Herring
2020-10-09 23:52     ` Laurent Pinchart
2021-01-15  7:59   ` Martin Kepplinger
2021-01-15 22:25     ` Laurent Pinchart
2021-01-16  6:41       ` Martin Kepplinger
2020-10-07  1:24 ` [PATCH v2 2/7] dt-bindings: display: mxsfb: Add and fix compatible strings Laurent Pinchart
2020-10-07  8:35   ` Marek Vasut
2020-10-07 16:01   ` Rob Herring
2020-10-07  1:24 ` [PATCH v2 3/7] dt-bindings: display: mxsfb: Add a bus-width endpoint property Laurent Pinchart
2020-10-07  8:40   ` Marek Vasut
2020-10-09 23:58     ` Laurent Pinchart
2020-10-10  8:47       ` Marek Vasut
2020-10-13  2:06         ` Laurent Pinchart
2020-10-13 11:03           ` Marek Vasut
2020-10-07 16:03   ` Rob Herring
2020-10-07  1:24 ` [PATCH v2 4/7] ARM: dts: imx: Fix LCDIF compatible strings Laurent Pinchart
2020-10-07  1:24 ` [PATCH v2 5/7] arm64: dts: imx8mq: " Laurent Pinchart
2020-10-07  1:24 ` [PATCH v2 6/7] ARM: dts: imx: Remove unneeded LCDIF disp_axi clock Laurent Pinchart
2020-10-07  1:24 ` [PATCH v2 7/7] drm: mxsfb: Add support for the bus-width DT property Laurent Pinchart
2020-10-10  0:01 ` [PATCH v2 8/7] dt-bindings: display: mxsfb: Add compatible for i.MX8MM Laurent Pinchart

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