linux-kernel - Re: [PATCH anybus v1 2/4] dt-bindings: anybus-bridge: document devicetree binding.

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Date:   Thu, 25 Oct 2018 12:16:32 +0200
From:   Linus Walleij <linus.walleij@...aro.org>
To:     svendev@...x.com
Cc:     Lee Jones <lee.jones@...aro.org>, Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Andreas Färber <afaerber@...e.de>,
        Thierry Reding <treding@...dia.com>,
        David Lechner <david@...hnology.com>,
        Noralf Trønnes <noralf@...nnes.org>,
        Johan Hovold <johan@...nel.org>,
        Michal Simek <monstr@...str.eu>, michal.vokac@...ft.com,
        Arnd Bergmann <arnd@...db.de>,
        Greg KH <gregkh@...uxfoundation.org>, john.garry@...wei.com,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Geert Uytterhoeven <geert+renesas@...der.be>,
        Robin Murphy <robin.murphy@....com>,
        Paul Gortmaker <paul.gortmaker@...driver.com>,
        Sebastien Bourdelin <sebastien.bourdelin@...oirfairelinux.com>,
        Icenowy Zheng <icenowy@...c.io>, yuanzhichang@...ilicon.com,
        Stuart Yoder <stuyoder@...il.com>,
        Maxime Ripard <maxime.ripard@...tlin.com>,
        bogdan.purcareata@....com,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>
Subject: Re: [PATCH anybus v1 2/4] dt-bindings: anybus-bridge: document
 devicetree binding.

Hi Sven,

thanks for your patch!

On Wed, Oct 24, 2018 at 4:25 PM Sven Van Asbroeck <svendev@...x.com> wrote:

> +  - pwms : the pwm connected to the bridge's 'pwm input'.

That is really unintuitive and needs a detailed explanation. What
is a bridge doing with a PWM? Is it 100% certain this is a PWM,
it's not just a .... clock? A pwm is a pule WIDTH modulator and
I can't for my life understand why a bus bridge needs a signal
with variable pulse width, but surprise me! :D

> +               fsl,weim-cs-timing = <0x024400b1 0x00001010 0x20081100
> +                               0x00000000 0xa0000240 0x00000000>;

Is it just a copy/paste from
Documentation/devicetree/bindings/bus/imx-weim.txt
leftover?

It was mentioned as undocumented but it is also pretty terse
with these opaque hex numbers. I would never let the
Freescale binding pass if I was reviewing it.

Look at my bindings for Qualcomm EBI in
Documentation/devicetree/bindings/bus/qcom,ebi2.txt
for example.

But maybe it's not even supposed to be there.

Yours,
Linus Walleij