linux-kernel - Re: [PATCH] dt-bindings: mtd: Change the schema for nodename which includes "sram"

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Date: Tue, 9 Jan 2024 15:22:02 -0600
From: Rob Herring <robh@...nel.org>
To: Bjorn Andersson <quic_bjorande@...cinc.com>
Cc: Zhenhua Huang <quic_zhenhuah@...cinc.com>, miquel.raynal@...tlin.com, richard@....at, vigneshr@...com, krzysztof.kozlowski+dt@...aro.org, conor+dt@...nel.org, linux-mtd@...ts.infradead.org, devicetree@...r.kernel.org, linux-kernel@...r.kernel.org, quic_tingweiz@...cinc.com
Subject: Re: [PATCH] dt-bindings: mtd: Change the schema for nodename which
 includes "sram"

On Tue, Jan 09, 2024 at 10:43:23AM -0800, Bjorn Andersson wrote:
> On Thu, Jan 04, 2024 at 07:23:02PM +0800, Zhenhua Huang wrote:
> > Node name which includes "sram" not only represents MTD devices, but also
> > lots of sram devices(eg, qcom,imem.yaml, rules in folder sram/*).
> > 
> > To avoid the conflicts, change the schema as:
> >  - if node name includes "sram", must select "compatible" to match
> > (I have listed all "comptible" string in mtd.yaml by searching
> > drivers/mtd/* to find applicable drivers)
> >  - if node name is nand/flash, use "nodename" to select.
> > 
> 
> You're right, it doesn't seem appropriate for the mtd binding to be
> selected for nodes intended to match e.g. the qcom,imem binding.
> 
> > Fixes: 7bdc671822e9 ("dt-bindings: mtd: physmap: Reuse the generic definitions")
> > Signed-off-by: Zhenhua Huang <quic_zhenhuah@...cinc.com>
> > ---
> > Hello,
> > 
> > Tested a few devicetree nodes, which confirms:
> > "qcom,imem.yaml" which in sram/ not matches with mtd.yaml anymore.
> > All nodes include string "sram" must have "compatible" which listed in
> > mtd.yaml to be matched.
> > 
> > Current I just modify the rule for "sram" as it is definitely conflicting with
> > rules in sram/*. I have not much backgrounds on nand/flash whether they may have
> > similar conflicts.
> > 
> >  Documentation/devicetree/bindings/mtd/mtd.yaml | 24 +++++++++++++++++++++---
> >  1 file changed, 21 insertions(+), 3 deletions(-)
> > 
> > diff --git a/Documentation/devicetree/bindings/mtd/mtd.yaml b/Documentation/devicetree/bindings/mtd/mtd.yaml
> > index f322290..1704437 100644
> > --- a/Documentation/devicetree/bindings/mtd/mtd.yaml
> > +++ b/Documentation/devicetree/bindings/mtd/mtd.yaml
> > @@ -10,10 +10,28 @@ maintainers:
> >    - Miquel Raynal <miquel.raynal@...tlin.com>
> >    - Richard Weinberger <richard@....at>
> >  
> > -properties:
> > -  $nodename:
> 
> The mtd binding is $ref'ed by other bindings, similar to how we do with
> other bindings of common properties.
> 
> So, I think the problem with mtd is that this ($nodename) turns into a
> "select" automatically, which causes this binding to match nodes by
> name, rather than just those $ref'ing it.
> 
> 
> We should be able to avoid the automatically created select from the
> $nodename, and rely on $ref, by just adding:
> 
> select: false

Yes.

Rob