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Received: from AM7PR04MB7046.eurprd04.prod.outlook.com (2603:10a6:20b:113::22) by VI0PR04MB11867.eurprd04.prod.outlook.com (2603:10a6:800:31e::21) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.9203.12; Tue, 14 Oct 2025 03:55:37 +0000 Received: from AM7PR04MB7046.eurprd04.prod.outlook.com ([fe80::4609:64af:8a4b:fd64]) by AM7PR04MB7046.eurprd04.prod.outlook.com ([fe80::4609:64af:8a4b:fd64%6]) with mapi id 15.20.9203.009; Tue, 14 Oct 2025 03:55:37 +0000 Message-ID: <239e8b99-0416-4708-9548-043d56ac88d2@nxp.com> Date: Tue, 14 Oct 2025 11:55:59 +0800 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH RESEND v4 2/3] dt-bindings: lcdif: Expand the imx6sl/imx6sll fallbacks To: Fabio Estevam Cc: marex@denx.de, stefan@agner.ch, airlied@gmail.com, simona@ffwll.ch, maarten.lankhorst@linux.intel.com, mripard@kernel.org, tzimmermann@suse.de, robh@kernel.org, krzk+dt@kernel.org, conor+dt@kernel.org, dri-devel@lists.freedesktop.org, devicetree@vger.kernel.org, shawnguo@kernel.org, imx@lists.linux.dev, linux-arm-kernel@lists.infradead.org, Ahmad Fatoum , Frank Li References: <20251013205155.1187947-1-festevam@gmail.com> <20251013205155.1187947-2-festevam@gmail.com> From: Liu Ying Content-Language: en-US In-Reply-To: <20251013205155.1187947-2-festevam@gmail.com> Content-Type: text/plain; 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> > This causes dt-schema warnings as the current binding only > allow 'fsl,imx6sx-lcdif' as fallback. > > ['fsl,imx6sl-lcdif', 'fsl,imx28-lcdif'] is too long > ['fsl,imx6sll-lcdif', 'fsl,imx28-lcdif'] is too long > > The imx6sx-lcdif programming model has more advanced features, such > as overlay plane and the CRC32 support than the imx28-lcdif IP. Sorry for the late comment, but the LCDIF chapter in i.MX28 TRM contains the CRC register too, though I agree that i.MX6SX LCDIF supports overlay plane while i.MX28 LCDIF doesn't. > > Expand the imx6sl/imx6sll lcdif fallbacks to accept a less specific > fsl,imx28-lcdif fallback: > > compatible = "fsl,imx6sl-lcdif", "fsl,imx6sx-lcdif", "fsl,imx28-lcdif"; Looking at i.MX6SL TRM, I don't find any register to control overlay plane in LCDIF chapter, so I don't think i.MX6SL LCDIF supports overlay plane like i.MX6SX LCDIF does. So, why not make the DT binding allow "compatible = "fsl,imx6sl-lcdif", "fsl,imx28-lcdif";" instead? I'm assuming i.MX6SL LCDIF and i.MX6SLL LCDIF are exactly the same. > > This helps keeping DT compatibility as well as using the more advanced > lcdif features found on imx6sl and imx6sll. > > Signed-off-by: Fabio Estevam > Acked-by: Rob Herring (Arm) > Reviewed-by: Ahmad Fatoum > Reviewed-by: Frank Li > --- > Documentation/devicetree/bindings/display/fsl,lcdif.yaml | 8 ++++++-- > 1 file changed, 6 insertions(+), 2 deletions(-) > > diff --git a/Documentation/devicetree/bindings/display/fsl,lcdif.yaml b/Documentation/devicetree/bindings/display/fsl,lcdif.yaml > index ce31b873fb95..d665f3241e97 100644 > --- a/Documentation/devicetree/bindings/display/fsl,lcdif.yaml > +++ b/Documentation/devicetree/bindings/display/fsl,lcdif.yaml > @@ -23,14 +23,18 @@ properties: > - fsl,imx93-lcdif > - items: > - enum: > - - fsl,imx6sl-lcdif > - - fsl,imx6sll-lcdif > - fsl,imx6ul-lcdif > - fsl,imx7d-lcdif > - fsl,imx8mm-lcdif > - fsl,imx8mn-lcdif > - fsl,imx8mq-lcdif > - const: fsl,imx6sx-lcdif > + - items: > + - enum: > + - fsl,imx6sl-lcdif > + - fsl,imx6sll-lcdif > + - const: fsl,imx6sx-lcdif > + - const: fsl,imx28-lcdif > - items: > - enum: > - fsl,imx6sx-lcdif -- Regards, Liu Ying