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

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Message-ID: <d7ea91a59dc57b4825cc82b18df37b94935d60de.camel@ew.tq-group.com>
Date:   Thu, 25 Nov 2021 14:23:20 +0100
From:   Alexander Stein <alexander.stein@...tq-group.com>
To:     Abel Vesa <abel.vesa@....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: (EXT) Re: (EXT) Re: [PATCH v4 12/12] dt-bindings:
 serial: fsl-lpuart: Add i.MX8DXL compatible

Am Donnerstag, dem 25.11.2021 um 15:19 +0200 schrieb Abel Vesa:
> On 21-11-23 08:30:17, Alexander Stein wrote:
> > Am Montag, dem 22.11.2021 um 18:45 +0200 schrieb Abel Vesa:
> > > 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
> > > 
> > 
> > Well, commit 
> > https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=b4b844930f27bf7019c0bbd8cc575dde32e00ecc
> > 
> >  says otherwise.
> > This might be true for earlycon only, because clocks should be
> > setup
> > already.
> > 
> > Together with your other mail regarding the imx7ulp fixup,
> > commit b4b844930f27bf7019c0bbd8cc575dde32e00ecc should just be
> > reverted
> > in order to get earlycon running again on imx8qm and imx8qxp, IMHO.
> > 
> 
> I think you're right, the commit b4b844930f27bf7019c should be
> reverted.
> 
> You can send the revert yourself, if you want. If not, let me know.

It's already there:

https://lore.kernel.org/all/20211124073109.805088-1-alexander.stein@ew.tq-group.com/T/

Thanks,
Alexander