linux-kernel - Re: [PATCH v1 11/19] dt-bindings: reset: npcm: Add support for NPCM8XX

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Date:   Mon, 23 May 2022 17:24:56 +0200
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Geert Uytterhoeven <geert@...ux-m68k.org>
Cc:     Tomer Maimon <tmaimon77@...il.com>,
        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>,
        Björn Andersson <bjorn.andersson@...aro.org>,
        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>, arm-soc <soc@...nel.org>,
        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>,
        Linux Watchdog Mailing List <linux-watchdog@...r.kernel.org>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH v1 11/19] dt-bindings: reset: npcm: Add support for
 NPCM8XX

On 23/05/2022 17:22, Krzysztof Kozlowski wrote:
>> I think you are taking a too-extremist standpoint.
>> The two extremes are:
>>   1. Numbers correspond to hardware numbers, and are easy to look up
>>     in the hardware documentation (e.g. GIC SPI interrupt numbers).
>>      => Use the hardcoded numbers in DTS.
> 
> And such numbers (like GIC_SPI interrupt numbers) do not go to bindings.
> They go to DTS only.
> 
>>   2. Numbers do not correspond to hardware numbers, so we had to
>>      invent our own definitions and numbers, usually loosely
>>      based on some table in the hardware documentation.
>>      The driver will have to look up the numbers in a data
>>      structure, to know how to program the hardware.
>>      The numbers become part of the DT ABI, and cannot be changed
>>      (header file is append-only).
>>      => Use the binding definitions in DTS.
> 
> Correct.
> 
> However this patch is some mixture of both approaches.
> 
> The same pointed by Arnd:
> https://lore.kernel.org/linux-devicetree/CAK8P3a0fDJQvGLEtG0fxLkG08Fh9V7LEMPsx4AaS+2Ldo_xWxw@mail.gmail.com/

...and one more from Arnd:
https://lore.kernel.org/linux-devicetree/CAK8P3a1APzs74YTcZ=m43G3zrmwJZKcYSTvV5eDDQX-37UY7Tw@mail.gmail.com/



Best regards,
Krzysztof