linux-kernel - Re: [PATCH v2 06/20] dt-binding: clk: npcm845: Add binding for Nuvoton NPCM8XX Clock

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Date:   Fri, 10 Jun 2022 00:21:30 +0300
From:   Tomer Maimon <tmaimon77@...il.com>
To:     Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
Cc:     Avi Fishman <avifishman70@...il.com>,
        Tali Perry <tali.perry1@...il.com>,
        Joel Stanley <joel@....id.au>,
        Patrick Venture <venture@...gle.com>,
        Nancy Yuen <yuenn@...gle.com>,
        Benjamin Fair <benjaminfair@...gle.com>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        Greg KH <gregkh@...uxfoundation.org>,
        Daniel Lezcano <daniel.lezcano@...aro.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Wim Van Sebroeck <wim@...ux-watchdog.org>,
        Guenter Roeck <linux@...ck-us.net>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>, Arnd Bergmann <arnd@...db.de>,
        Olof Johansson <olof@...om.net>,
        Jiri Slaby <jirislaby@...nel.org>,
        Shawn Guo <shawnguo@...nel.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Geert Uytterhoeven <geert+renesas@...der.be>,
        Marcel Ziswiler <marcel.ziswiler@...adex.com>,
        Vinod Koul <vkoul@...nel.org>,
        Biju Das <biju.das.jz@...renesas.com>,
        Nobuhiro Iwamatsu <nobuhiro1.iwamatsu@...hiba.co.jp>,
        Robert Hancock <robert.hancock@...ian.com>,
        Jonathan Neuschäfer <j.neuschaefer@....net>,
        Lubomir Rintel <lkundrak@...sk>,
        devicetree <devicetree@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linux-clk <linux-clk@...r.kernel.org>,
        "open list:SERIAL DRIVERS" <linux-serial@...r.kernel.org>,
        LINUXWATCHDOG <linux-watchdog@...r.kernel.org>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH v2 06/20] dt-binding: clk: npcm845: Add binding for
 Nuvoton NPCM8XX Clock

Hi Krzysztof,


On Thu, 9 Jun 2022 at 16:22, Krzysztof Kozlowski
<krzysztof.kozlowski@...aro.org> wrote:
>
> On 09/06/2022 15:17, Tomer Maimon wrote:
> > Hi Krzysztof,
> >
> > Thanks for your comments.
> >
> > On Wed, 8 Jun 2022 at 13:03, Krzysztof Kozlowski
> > <krzysztof.kozlowski@...aro.org> wrote:
> >>
> >> On 08/06/2022 11:56, Tomer Maimon wrote:
> >>> Add binding for the Arbel BMC NPCM8XX Clock controller.
> >>>
> >>> Signed-off-by: Tomer Maimon <tmaimon77@...il.com>
> >>> ---
> >>>  .../bindings/clock/nuvoton,npcm845-clk.yaml   | 63 +++++++++++++++++++
> >>>  .../dt-bindings/clock/nuvoton,npcm8xx-clock.h | 50 +++++++++++++++
> >>>  2 files changed, 113 insertions(+)
> >>>  create mode 100644 Documentation/devicetree/bindings/clock/nuvoton,npcm845-clk.yaml
> >>>  create mode 100644 include/dt-bindings/clock/nuvoton,npcm8xx-clock.h
> >>>
> >>> diff --git a/Documentation/devicetree/bindings/clock/nuvoton,npcm845-clk.yaml b/Documentation/devicetree/bindings/clock/nuvoton,npcm845-clk.yaml
> >>> new file mode 100644
> >>> index 000000000000..e1f375716bc5
> >>> --- /dev/null
> >>> +++ b/Documentation/devicetree/bindings/clock/nuvoton,npcm845-clk.yaml
> >>> @@ -0,0 +1,63 @@
> >>> +# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
> >>> +%YAML 1.2
> >>> +---
> >>> +$id: http://devicetree.org/schemas/clock/nuvoton,npcm845-clk.yaml#
> >>> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> >>> +
> >>> +title: Nuvoton NPCM8XX Clock Controller Binding
> >>> +
> >>> +maintainers:
> >>> +  - Tomer Maimon <tmaimon77@...il.com>
> >>> +
> >>> +description: |
> >>> +  Nuvoton Arbel BMC NPCM8XX contains an integrated clock controller, which
> >>> +  generates and supplies clocks to all modules within the BMC.
> >>> +
> >>> +properties:
> >>> +  compatible:
> >>> +    enum:
> >>> +      - nuvoton,npcm845-clk
> >>> +
> >>> +  reg:
> >>> +    maxItems: 1
> >>> +
> >>> +  clocks:
> >>> +    items:
> >>> +      - description: 25M reference clock
> >>> +      - description: CPU reference clock
> >>> +      - description: MC reference clock
> >>> +
> >>> +  clock-names:
> >>> +    items:
> >>> +      - const: refclk
> >>> +      - const: sysbypck
> >>> +      - const: mcbypck
> >>> +
> >>
> >> I asked what is the suffix about and you replied "ck"... ok, so let's
> >> make clear. This should be:
> >>
> >>     items:
> >>       - const: ref
> >>       - const: sysbyp
> >>       - const: mcbyp
> >>
> >> or something similar, without the same suffix all over.
> > The clock names are the same clock name in our spec, this why we
> > prefer to leave the clock names as is.
>
> The naming with useless suffixes does not help. If your spec had
> "refclk_really_clock_this_is_a_clock" you also would insist on that? It
> does not make sense.
Sorry but I don't understand why the clock name cause an issue, we
prefer it will be the same as in our spec-clock diagram
BTW, the same naming found in NPCM7XX
https://elixir.bootlin.com/linux/v5.19-rc1/source/Documentation/devicetree/bindings/clock/nuvoton,npcm750-clk.txt#L36
>
> >>
> >>> diff --git a/include/dt-bindings/clock/nuvoton,npcm8xx-clock.h b/include/dt-bindings/clock/nuvoton,npcm8xx-clock.h
> >>> new file mode 100644
> >>> index 000000000000..229915a254a5
> >>> --- /dev/null
> >>> +++ b/include/dt-bindings/clock/nuvoton,npcm8xx-clock.h
> >>
> >> Same comment as before. No changes here...
> >>
> > about the comments from V1::
> > - Krzysztof: Filename - same as bindings, so nuvoton,npcm845-clk.h
> > In NPCM7XX we use the same include file and clock source
> > dt-binding
> > https://elixir.bootlin.com/linux/v5.19-rc1/source/Documentation/devicetree/bindings/clock/nuvoton,npcm750-clk.txt
> > dt-binding include
> > https://elixir.bootlin.com/linux/v5.19-rc1/source/include/dt-bindings/clock/nuvoton,npcm7xx-clock.h
> > we prefer to be align with our older BMC version
>
> Older has incorrect name, so do not align to incorrect one. What is the
> logic behind having header not matching the bindings file? It makes it
> only more difficult to connect these two.
Will modify the file name in V3 to be the same as dt-binding
>
> >
> > - Krzysztof: Dual license, same as bindings.
> > modified in the file * SPDX-License-Identifier: (GPL-2.0-only OR
> > BSD-2-Clause) */
> > the same license approved in en7523-clk include file and pushed to
> > Linux kernel 5.19 :
> > https://elixir.bootlin.com/linux/v5.19-rc1/source/include/dt-bindings/clock/en7523-clk.h
>
> I don't understand this comment at all. I am not commenting about
> en7523-clk.h. I am commenting about the header here - it should have
> dual license. What en7523-clk.h has to do with it?
>
> Best regards,
> Krzysztof

Best regards,

Tomer