linux-kernel - Re: [PATCH v3 02/10] dt-bindings: sram: Convert Samsung Exynos SYSRAM bindings to json-schema

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Date:   Fri, 11 Oct 2019 09:52:53 +0200
From:   Krzysztof Kozlowski <krzk@...nel.org>
To:     Rob Herring <robh@...nel.org>
Cc:     Mark Rutland <mark.rutland@....com>, Kukjin Kim <kgene@...nel.org>,
        Benoît Cousson <bcousson@...libre.com>,
        Tony Lindgren <tony@...mide.com>,
        Jason Cooper <jason@...edaemon.net>,
        Andrew Lunn <andrew@...n.ch>,
        Sebastian Hesselbarth <sebastian.hesselbarth@...il.com>,
        Gregory Clement <gregory.clement@...tlin.com>,
        Shawn Guo <shawnguo@...nel.org>,
        Sascha Hauer <s.hauer@...gutronix.de>,
        Pengutronix Kernel Team <kernel@...gutronix.de>,
        Fabio Estevam <festevam@...il.com>,
        NXP Linux Team <linux-imx@....com>,
        Santosh Shilimkar <ssantosh@...nel.org>,
        Thierry Reding <thierry.reding@...il.com>,
        Jonathan Hunter <jonathanh@...dia.com>,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-samsung-soc@...r.kernel.org, linux-omap@...r.kernel.org,
        linux-tegra@...r.kernel.org
Subject: Re: [PATCH v3 02/10] dt-bindings: sram: Convert Samsung Exynos
 SYSRAM bindings to json-schema

On Thu, Oct 10, 2019 at 02:33:56PM -0500, Rob Herring wrote:
> On Wed, Oct 02, 2019 at 06:43:08PM +0200, Krzysztof Kozlowski wrote:
> > Convert Samsung Exynos SYSRAM bindings to DT schema format using
> > json-schema.
> > 
> > Signed-off-by: Krzysztof Kozlowski <krzk@...nel.org>
> > 
> > ---
> > 
> > Changes since v2:
> > 1. Use sram as name of node in example.
> > 
> > Changes since v1:
> > 1. Indent example with four spaces (more readable).
> > ---
> >  .../devicetree/bindings/sram/samsung-sram.txt | 38 ------------
> >  .../bindings/sram/samsung-sram.yaml           | 58 +++++++++++++++++++
> >  MAINTAINERS                                   |  2 +-
> >  3 files changed, 59 insertions(+), 39 deletions(-)
> >  delete mode 100644 Documentation/devicetree/bindings/sram/samsung-sram.txt
> >  create mode 100644 Documentation/devicetree/bindings/sram/samsung-sram.yaml
> 
> 
> > diff --git a/Documentation/devicetree/bindings/sram/samsung-sram.yaml b/Documentation/devicetree/bindings/sram/samsung-sram.yaml
> > new file mode 100644
> > index 000000000000..3e77c434ecca
> > --- /dev/null
> > +++ b/Documentation/devicetree/bindings/sram/samsung-sram.yaml
> > @@ -0,0 +1,58 @@
> > +# SPDX-License-Identifier: GPL-2.0
> > +%YAML 1.2
> > +---
> > +$id: http://devicetree.org/schemas/sram/samsung-sram.yaml#
> > +$schema: http://devicetree.org/meta-schemas/core.yaml#
> > +
> > +title: Samsung Exynos SoC SYSRAM for SMP bringup
> > +
> > +maintainers:
> > +  - Krzysztof Kozlowski <krzk@...nel.org>
> > +
> > +description: |+
> > +  Samsung SMP-capable Exynos SoCs use part of the SYSRAM for the bringup
> > +  of the secondary cores. Once the core gets powered up it executes the
> > +  code that is residing at some specific location of the SYSRAM.
> > +
> > +  Therefore reserved section sub-nodes have to be added to the mmio-sram
> > +  declaration. These nodes are of two types depending upon secure or
> > +  non-secure execution environment.
> > +
> > +allOf:
> > +  - $ref: "sram.yaml#"
> > +
> > +properties:
> > +  $nodename:
> > +    pattern: "^sysram(@.*)?"
> 
> As you are renaming all the node names, this will no longer work. If you 
> change it to 'sram', that's going to match others, but would still work 
> as long as the child node names are unique to Samsung. If you change 
> them to '*-sram' then, you'd have to come up with something else. That 
> probably means using 'compatible' strings. At that point, it's kind of 
> silly to just be validating what your are using to select the schema. It 
> may be better to just add the compatible strings into sram.yaml if 
> that's the only difference.

You're right. I'll move them to sram.yaml and maybe add also example.


Best regards,
Krzysztof