linux-kernel - RE: [PATCH v4 3/8] dt-bindings: mfd: renesas,rzn1-sysctrl: document RZ/N1 sysctrl node

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Date:   Tue, 17 Apr 2018 07:56:40 +0000
From:   Michel Pollet <michel.pollet@...renesas.com>
To:     Rob Herring <robh@...nel.org>,
        Geert Uytterhoeven <geert@...ux-m68k.org>
CC:     "linux-renesas-soc@...r.kernel.org" 
        <linux-renesas-soc@...r.kernel.org>,
        Simon Horman <horms@...ge.net.au>,
        Phil Edworthy <phil.edworthy@...esas.com>,
        "buserror+upstream@...il.com" <buserror+upstream@...il.com>,
        Magnus Damm <magnus.damm@...il.com>,
        Mark Rutland <mark.rutland@....com>,
        Lee Jones <lee.jones@...aro.org>,
        Russell King <linux@...linux.org.uk>,
        "Sebastian Reichel" <sre@...nel.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-pm@...r.kernel.org" <linux-pm@...r.kernel.org>
Subject: RE: [PATCH v4 3/8] dt-bindings: mfd: renesas,rzn1-sysctrl: document
 RZ/N1 sysctrl node

Hi Rob,

On 13 April 2018 19:06, Rob Herring:
> On Tue, Apr 10, 2018 at 09:30:03AM +0100, Michel Pollet wrote:
> > The Renesas RZ/N1 Family (Part #R9A06G0xx) has a multi-function system
> > controller. This documents the node used to encapsulate it's sub
> > drivers.
> >
> > Signed-off-by: Michel Pollet <michel.pollet@...renesas.com>
> > ---
> >  .../bindings/mfd/renesas,rzn1-sysctrl.txt          | 23
> ++++++++++++++++++++++
> >  1 file changed, 23 insertions(+)
> >  create mode 100644
> > Documentation/devicetree/bindings/mfd/renesas,rzn1-sysctrl.txt
> >
> > diff --git
> > a/Documentation/devicetree/bindings/mfd/renesas,rzn1-sysctrl.txt
> > b/Documentation/devicetree/bindings/mfd/renesas,rzn1-sysctrl.txt
> > new file mode 100644
> > index 0000000..9897f8f
> > --- /dev/null
> > +++ b/Documentation/devicetree/bindings/mfd/renesas,rzn1-sysctrl.txt
> > @@ -0,0 +1,23 @@
> > +DT bindings for the Renesas RZ/N1 System Controller
> > +
> > +== System Controller Node ==
> > +
> > +The system controller node currently only hosts a single sub-node to
> > +handle the rebooting of the CPU. Eventually it will host the clock
> > +driver, SMP start handler, watchdog etc.
>
> Please submit a complete binding for the h/w block.
>
> Again, if the only reason you have sub nodes is to define compatible strings
> and in turn enumerate drivers, then you don't need the nodes in DT. DT is
> not the only way to instantiate drivers.

I can't document it before I have the code. There is 0.000% chance of my clock
driver for example to be upstreamed the way I would imagine making it -- in
fact pretty much any other driver will have to be reworked to fit, so documenting
bindings first is impossible.

So, if I understand correctly, you are telling me to make a 'sysctrl' driver and use
platform_device to instantiate my sub-drivers? Isn't that what machine files used
to do? And they are now banned?

Geert, any guidance here?

>
> Rob

Thanks!
Michel




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