linux-kernel - Re: [PATCH v5 2/6] Bindings: nvmem: add bindings for JZ4780 efuse

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Date:   Mon, 24 Feb 2020 08:33:35 +0100
From:   Andreas Kemnade <andreas@...nade.info>
To:     "H. Nikolaus Schaller" <hns@...delico.com>
Cc:     PrasannaKumar Muralidharan <prasannatsmkumar@...il.com>,
        Paul Cercueil <paul@...pouillou.net>,
        Mathieu Malaterre <malat@...ian.org>,
        Srinivas Kandagatla <srinivas.kandagatla@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Ralf Baechle <ralf@...ux-mips.org>,
        Paul Burton <paulburton@...nel.org>,
        Mauro Carvalho Chehab <mchehab+samsung@...nel.org>,
        "David S. Miller" <davem@...emloft.net>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jonathan Cameron <Jonathan.Cameron@...wei.com>,
        Krzysztof Kozlowski <krzk@...nel.org>,
        Kees Cook <keescook@...omium.org>,
        Andi Kleen <ak@...ux.intel.com>,
        Geert Uytterhoeven <geert+renesas@...der.be>,
        linux-kernel@...r.kernel.org, devicetree@...r.kernel.org,
        linux-mips@...r.kernel.org, letux-kernel@...nphoenux.org,
        kernel@...a-handheld.com
Subject: Re: [PATCH v5 2/6] Bindings: nvmem: add bindings for JZ4780 efuse

On Sat, 22 Feb 2020 17:34:06 +0100
"H. Nikolaus Schaller" <hns@...delico.com> wrote:

> > Am 22.02.2020 um 16:57 schrieb Andreas Kemnade <andreas@...nade.info>:
> > 
> > On Sat, 22 Feb 2020 11:25:37 +0100
> > "H. Nikolaus Schaller" <hns@...delico.com> wrote:
> >   
> >> From: PrasannaKumar Muralidharan <prasannatsmkumar@...il.com>
> >> 
> >> This patch brings support for the JZ4780 efuse. Currently it only exposes
> >> a read only access to the entire 8K bits efuse memory.
> >> 
> >> Tested-by: Mathieu Malaterre <malat@...ian.org>
> >> Signed-off-by: PrasannaKumar Muralidharan <prasannatsmkumar@...il.com>
> >> Signed-off-by: Mathieu Malaterre <malat@...ian.org>
> >> Signed-off-by: H. Nikolaus Schaller <hns@...delico.com>
> >> [converted to yaml]
> >> Signed-off-by: Andreas Kemnade <andreas@...nade.info>
> >> ---
> >> .../bindings/nvmem/ingenic,jz4780-efuse.yaml  | 50 +++++++++++++++++++
> >> 1 file changed, 50 insertions(+)
> >> create mode 100644 Documentation/devicetree/bindings/nvmem/ingenic,jz4780-efuse.yaml
> >> 
> >> diff --git a/Documentation/devicetree/bindings/nvmem/ingenic,jz4780-efuse.yaml b/Documentation/devicetree/bindings/nvmem/ingenic,jz4780-efuse.yaml
> >> new file mode 100644
> >> index 000000000000..09a8ef937750
> >> --- /dev/null
> >> +++ b/Documentation/devicetree/bindings/nvmem/ingenic,jz4780-efuse.yaml
> >> @@ -0,0 +1,50 @@
> >> +# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
> >> +%YAML 1.2
> >> +---
> >> +$id: http://devicetree.org/schemas/nvmem/ingenic,jz4780-efuse.yaml#
> >> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> >> +
> >> +title: Ingenic JZ EFUSE driver bindings
> >> +
> >> +maintainers:
> >> +  - PrasannaKumar Muralidharan <prasannatsmkumar@...il.com>
> >> +
> >> +allOf:
> >> +  - $ref: "nvmem.yaml#"
> >> +
> >> +properties:
> >> +  compatible:
> >> +    enum:
> >> +      - ingenic,jz4780-efuse
> >> +
> >> +  reg:
> >> +    maxItems: 1
> >> +
> >> +  clocks:
> >> +    # Handle for the ahb for the efuse.
> >> +    maxItems: 1
> >> +
> >> +  clock-names:
> >> +   items:
> >> +     - const:  ahb2  
> > as Rob said: probably not needed, since it is a single
> > clock, and the driver uses devm_clk_get(dev, NULL), so it should be prepared
> > for that without any extra work.  
> 
> The question is if a specific driver implementation should determine
> what the DT requires or the other way round. I don't know...
> 
> I did interpret Rob's comment differently: there was
> 
> > - "clock-names"		Must be "bus_clk"  
> 
> and he did say: 
> 
> 	'clk' is redundant. How about 'ahb'?
> 
> So I thought he refers to the _clk suffix?
> 
> >   
> >> +
> >> +required:
> >> +  - compatible
> >> +  - reg
> >> +  - clock-names  
> > so it is not required here (but "- clocks" (not "- clock") as said in earlier
> > mail).  
> 
> Well, this is another example where I do not yet see any improvement by yaml.
> It is the same amount of guessing what should be written where. Is this to
> be added or not? When is it and why, when not and why?
> 
well, this is the list of required properties which have to be an any
devicetree using that device, the conversion of the comments for the properties
in the .txt-file.
So, if you do not declare a property before, you cannot specify that it is
required. So if we drop the definition of clock-names we cannot declare it
as required. 

Regards,
Andreas

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