linux-kernel - Re: [PATCH 3/4] dt-bindings: power: reset: Add regmap support to the SYSCON reboot-mode bindings

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Date:   Fri, 13 Mar 2020 16:02:31 +0300
From:   Sergey Semin <Sergey.Semin@...kalelectronics.ru>
To:     Rob Herring <robh@...nel.org>
CC:     Sebastian Reichel <sre@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Alexey Malahov <Alexey.Malahov@...kalelectronics.ru>,
        Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
        Paul Burton <paulburton@...nel.org>,
        Ralf Baechle <ralf@...ux-mips.org>, <linux-pm@...r.kernel.org>,
        <devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 3/4] dt-bindings: power: reset: Add regmap support to the
 SYSCON reboot-mode bindings

On Thu, Mar 12, 2020 at 04:14:38PM -0500, Rob Herring wrote:
> On Fri, Mar 06, 2020 at 04:03:40PM +0300, Sergey.Semin@...kalelectronics.ru wrote:
> > From: Serge Semin <Sergey.Semin@...kalelectronics.ru>
> > 
> > Optional regmap property will be used to refer to a syscon-controller
> > having a reboot tolerant register mapped.
> 
> NAK. It should simply be a child node of the 'syscon-controller'.

Hm, It's dilemma. The driver maintainer said ack, while you disagree.)
So the code change will be merged while the doc-part won't? Lets discuss then
to settle the issue.

Why 'syscon-reboot' can be out of syscon-controller node, while
'syscon-reboot-mode' can't? They both belong to the same usecase: save
cause id and reboot. So having similar properties-set and declaring their
nodes someplace nearby is natural. According to the driver 'syscon-reboot'
can't lack the regmap property because it's mandatory, while here you refuse
to have even optional support. Additionally in most of the cases the
'syscon-reboot' nodes aren't declared as a child of a system controller
node. Why 'syscon-reboot-mode' can't work in a similar way?

Regards,
-Sergey

> 
> > 
> > Signed-off-by: Serge Semin <Sergey.Semin@...kalelectronics.ru>
> > Signed-off-by: Alexey Malahov <Alexey.Malahov@...kalelectronics.ru>
> > Cc: Thomas Bogendoerfer <tsbogend@...ha.franken.de>
> > Cc: Paul Burton <paulburton@...nel.org>
> > Cc: Ralf Baechle <ralf@...ux-mips.org>
> > ---
> >  .../bindings/power/reset/syscon-reboot-mode.yaml         | 9 ++++++---
> >  1 file changed, 6 insertions(+), 3 deletions(-)
> > 
> > diff --git a/Documentation/devicetree/bindings/power/reset/syscon-reboot-mode.yaml b/Documentation/devicetree/bindings/power/reset/syscon-reboot-mode.yaml
> > index e09bb07b1abb..f47bf52ad983 100644
> > --- a/Documentation/devicetree/bindings/power/reset/syscon-reboot-mode.yaml
> > +++ b/Documentation/devicetree/bindings/power/reset/syscon-reboot-mode.yaml
> > @@ -13,9 +13,8 @@ description: |
> >    This driver gets reboot mode magic value from reboot-mode driver
> >    and stores it in a SYSCON mapped register. Then the bootloader
> >    can read it and take different action according to the magic
> > -  value stored. The SYSCON mapped register is retrieved from the
> > -  parental dt-node plus the offset. So the SYSCON reboot-mode node
> > -  should be represented as a sub-node of a "syscon", "simple-mfd" node.
> > +  value stored. The SYSCON mapped register is retrieved either from
> > +  the parental dt-node or from a regmap phandle plus the offset.
> >  
> >  properties:
> >    compatible:
> > @@ -29,6 +28,10 @@ properties:
> >      $ref: /schemas/types.yaml#/definitions/uint32
> >      description: Offset in the register map for the mode register (in bytes).
> >  
> > +  regmap:
> > +    $ref: /schemas/types.yaml#/definitions/phandle
> > +    description: Phandle to the register map node.
> > +
> >  patternProperties:
> >    "^mode-.+":
> >      $ref: /schemas/types.yaml#/definitions/uint32
> > -- 
> > 2.25.1
> >