linux-kernel - Re: [PATCH v2 07/24] dt-bindings: net: dwmac: Detach Generic DW MAC bindings

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Message-ID: <20210210220518.nbzm6ux6pui2csbf@mobilestation>
Date:   Thu, 11 Feb 2021 01:05:18 +0300
From:   Serge Semin <Sergey.Semin@...kalelectronics.ru>
To:     Rob Herring <robh@...nel.org>
CC:     Serge Semin <fancer.lancer@...il.com>,
        Giuseppe Cavallaro <peppe.cavallaro@...com>,
        Alexandre Torgue <alexandre.torgue@...com>,
        Jose Abreu <joabreu@...opsys.com>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Johan Hovold <johan@...nel.org>,
        Maxime Ripard <mripard@...nel.org>,
        Joao Pinto <jpinto@...opsys.com>,
        Lars Persson <larper@...s.com>,
        Alexey Malahov <Alexey.Malahov@...kalelectronics.ru>,
        Pavel Parkhomenko <Pavel.Parkhomenko@...kalelectronics.ru>,
        Vyacheslav Mitrofanov 
        <Vyacheslav.Mitrofanov@...kalelectronics.ru>,
        Maxime Coquelin <mcoquelin.stm32@...il.com>,
        <netdev@...r.kernel.org>,
        <linux-stm32@...md-mailman.stormreply.com>,
        <linux-arm-kernel@...ts.infradead.org>,
        <devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 07/24] dt-bindings: net: dwmac: Detach Generic DW MAC
 bindings

On Tue, Feb 09, 2021 at 04:32:58PM -0600, Rob Herring wrote:
> On Mon, Feb 08, 2021 at 04:55:51PM +0300, Serge Semin wrote:
> > Currently the snps,dwmac.yaml DT bindings file is used for both DT nodes
> > describing generic DW MAC devices and as DT schema with common properties
> > to be evaluated against a vendor-specific DW MAC IP-cores. Due to such
> > dual-purpose design the "compatible" property of the common DW MAC schema
> > needs to contain the vendor-specific strings to successfully pass the
> > schema evaluation in case if it's referenced from the vendor-specific DT
> > bindings. That's a bad design from maintainability point of view, since
> > adding/removing any DW MAC-based device bindings requires the common
> > schema modification. In order to fix that let's detach the schema which
> > provides the generic DW MAC DT nodes evaluation into a dedicated DT
> > bindings file preserving the common DW MAC properties declaration in the
> > snps,dwmac.yaml file. By doing so we'll still provide a common properties
> > evaluation for each vendor-specific MAC bindings which refer to the
> > common bindings file, while the generic DW MAC DT nodes will be checked
> > against the new snps,dwmac-generic.yaml DT schema.
> > 
> > Signed-off-by: Serge Semin <Sergey.Semin@...kalelectronics.ru>
> > 
> > ---
> > 
> > Changelog v2:
> > - Add a note to the snps,dwmac-generic.yaml bindings file description of
> >   a requirement to create a new DT bindings file for the vendor-specific
> >   versions of the DW MAC.
> > ---
> >  .../bindings/net/snps,dwmac-generic.yaml      | 154 ++++++++++++++++++
> >  .../devicetree/bindings/net/snps,dwmac.yaml   | 139 +---------------
> >  2 files changed, 155 insertions(+), 138 deletions(-)
> >  create mode 100644 Documentation/devicetree/bindings/net/snps,dwmac-generic.yaml
> > 
> > diff --git a/Documentation/devicetree/bindings/net/snps,dwmac-generic.yaml b/Documentation/devicetree/bindings/net/snps,dwmac-generic.yaml
> > new file mode 100644
> > index 000000000000..6c3bf5b2f890
> > --- /dev/null
> > +++ b/Documentation/devicetree/bindings/net/snps,dwmac-generic.yaml
> > @@ -0,0 +1,154 @@
> > +# SPDX-License-Identifier: GPL-2.0
> > +%YAML 1.2
> > +---
> > +$id: http://devicetree.org/schemas/net/snps,dwmac-generic.yaml#
> > +$schema: http://devicetree.org/meta-schemas/core.yaml#
> > +
> > +title: Synopsys DesignWare Generic MAC Device Tree Bindings
> > +
> > +maintainers:
> > +  - Alexandre Torgue <alexandre.torgue@...com>
> > +  - Giuseppe Cavallaro <peppe.cavallaro@...com>
> > +  - Jose Abreu <joabreu@...opsys.com>
> > +
> > +description:
> > +  The primary purpose of this bindings file is to validate the Generic
> > +  Synopsys Desginware MAC DT nodes defined in accordance with the select
> > +  schema. All new vendor-specific versions of the DW *MAC IP-cores must
> > +  be described in a dedicated DT bindings file.
> > +
> > +# Select the DT nodes, which have got compatible strings either as just a
> > +# single string with IP-core name optionally followed by the IP version or
> > +# two strings: one with IP-core name plus the IP version, another as just
> > +# the IP-core name.
> > +select:
> > +  properties:
> > +    compatible:
> > +      oneOf:
> > +        - items:
> > +            - pattern: "^snps,dw(xg)+mac(-[0-9]+\\.[0-9]+a?)?$"
> 

> Use '' instead of "" and you can skip the double \.
> 
> With that,
> 
> Reviewed-by: Rob Herring <robh@...nel.org>

Got it. Thanks.

-Sergey

> 
> > +        - items:
> > +            - pattern: "^snps,dwmac-[0-9]+\\.[0-9]+a?$"
> > +            - const: snps,dwmac
> > +        - items:
> > +            - pattern: "^snps,dwxgmac-[0-9]+\\.[0-9]+a?$"
> > +            - const: snps,dwxgmac