linux-kernel - Re: (EXT) Re: [PATCH v4 12/12] dt-bindings: serial: fsl-lpuart: Add i.MX8DXL compatible

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Message-ID: <YZvJP2ISfc/zyK+4@ryzen>
Date:   Mon, 22 Nov 2021 18:45:51 +0200
From:   Abel Vesa <abel.vesa@....com>
To:     Alexander Stein <alexander.stein@...tq-group.com>
Cc:     Rob Herring <robh@...nel.org>, Dong Aisheng <aisheng.dong@....com>,
        Shawn Guo <shawnguo@...nel.org>,
        Sascha Hauer <s.hauer@...gutronix.de>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Fabio Estevam <festevam@...il.com>,
        Pengutronix Kernel Team <kernel@...gutronix.de>,
        linux-i2c@...r.kernel.org, linux-serial@...r.kernel.org,
        NXP Linux Team <linux-imx@....com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linux-arm-kernel@...ts.infradead.org, devicetree@...r.kernel.org
Subject: Re: (EXT) Re: [PATCH v4 12/12] dt-bindings: serial: fsl-lpuart: Add
 i.MX8DXL compatible

On 21-11-19 08:17:11, Alexander Stein wrote:
> Am Donnerstag, dem 18.11.2021 um 19:04 -0600 schrieb Rob Herring:
> > On Wed, Nov 10, 2021 at 07:46:55PM +0200, Abel Vesa wrote:
> > > Add i.MX8DXL lpuart compatible to the bindings documentation.
> > > 
> > > Signed-off-by: Abel Vesa <
> > > abel.vesa@....com
> > > >
> > > ---
> > >  Documentation/devicetree/bindings/serial/fsl-lpuart.yaml | 4 ++++
> > >  1 file changed, 4 insertions(+)
> > > 
> > > diff --git a/Documentation/devicetree/bindings/serial/fsl-
> > > lpuart.yaml b/Documentation/devicetree/bindings/serial/fsl-
> > > lpuart.yaml
> > > index dc1f0e07cbd4..fa8a602ccb22 100644
> > > --- a/Documentation/devicetree/bindings/serial/fsl-lpuart.yaml
> > > +++ b/Documentation/devicetree/bindings/serial/fsl-lpuart.yaml
> > > @@ -27,6 +27,10 @@ properties:
> > >        - items:
> > >            - const: fsl,imx8qm-lpuart
> > >            - const: fsl,imx8qxp-lpuart
> > > +      - items:
> > > +          - const: fsl,imx8dxl-lpuart
> > > +          - const: fsl,imx8qxp-lpuart
> > > +          - const: fsl,imx7ulp-lpuart
> > 
> > I'm confused why 8dxl is compatible with 7ulp, but 8qm is not? From
> > the 
> > driver, it looks like the difference is clocks.
> 
> There is a difference between 8qm and 7ulp regarding the clocks. Are
> they still considered compatible? Depending on the answer [1] might not
> be the correct solution for earlycon regression on 8qm.
> 

In NXP's tree, they are not compatible.

See here:

https://source.codeaurora.org/external/imx/linux-imx/tree/arch/arm64/boot/dts/freescale/imx8qm-ss-dma.dtsi?h=lf-5.10.y#n9

> Best regards,
> Alexander
> 
> [1] 
> http://lists.infradead.org/pipermail/linux-arm-kernel/2021-November/696770.html
> 
>