Re: [PATCH v4 1/4] dt-bindings: net: can: Add poll-interval for MCAN - Marc Kleine-Budde

From: Marc Kleine-Budde <mkl@pengutronix.de>
To: Rob Herring <robh@kernel.org>
Cc: Judith Mendez <jm@ti.com>,
	Chandrasekar Ramakrishnan <rcsekar@samsung.com>,
	Wolfgang Grandegger <wg@grandegger.com>,
	Krzysztof Kozlowski <krzysztof.kozlowski+dt@linaro.org>,
	"David S . Miller" <davem@davemloft.net>,
	Eric Dumazet <edumazet@google.com>,
	Jakub Kicinski <kuba@kernel.org>, Paolo Abeni <pabeni@redhat.com>,
	linux-can@vger.kernel.org, netdev@vger.kernel.org,
	linux-kernel@vger.kernel.org, Schuyler Patton <spatton@ti.com>,
	Nishanth Menon <nm@ti.com>, Vignesh Raghavendra <vigneshr@ti.com>,
	Tero Kristo <kristo@kernel.org>,
	linux-arm-kernel@lists.infradead.org, devicetree@vger.kernel.org,
	Oliver Hartkopp <socketcan@hartkopp.net>,
	Simon Horman <simon.horman@corigine.com>
Subject: Re: [PATCH v4 1/4] dt-bindings: net: can: Add poll-interval for MCAN
Date: Tue, 9 May 2023 14:27:04 +0200	[thread overview]
Message-ID: <20230509-strike-available-6b2378172a59-mkl@pengutronix.de> (raw)
In-Reply-To: <20230505212948.GA3590042-robh@kernel.org>

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On 05.05.2023 16:29:48, Rob Herring wrote:
> On Mon, May 01, 2023 at 05:46:21PM -0500, Judith Mendez wrote:
> > On AM62x SoC, MCANs on MCU domain do not have hardware interrupt
> > routed to A53 Linux, instead they will use software interrupt by
> > hrtimer. To enable timer method, interrupts should be optional so
> > remove interrupts property from required section and introduce
> > poll-interval property.
> > 
> > Signed-off-by: Judith Mendez <jm@ti.com>
> > ---
> > Changelog:
> > v3:
> >  1. Move binding patch to first in series
> >  2. Update description for poll-interval
> >  3. Add oneOf to specify using interrupts/interrupt-names or poll-interval
> >  4. Fix example property: add comment below 'example'
> > 
> > v2:
> >   1. Add poll-interval property to enable timer polling method
> >   2. Add example using poll-interval property
> >   
> >  .../bindings/net/can/bosch,m_can.yaml         | 36 +++++++++++++++++--
> >  1 file changed, 34 insertions(+), 2 deletions(-)
> > 
> > diff --git a/Documentation/devicetree/bindings/net/can/bosch,m_can.yaml b/Documentation/devicetree/bindings/net/can/bosch,m_can.yaml
> > index 67879aab623b..c024ee49962c 100644
> > --- a/Documentation/devicetree/bindings/net/can/bosch,m_can.yaml
> > +++ b/Documentation/devicetree/bindings/net/can/bosch,m_can.yaml
> > @@ -14,6 +14,13 @@ maintainers:
> >  allOf:
> >    - $ref: can-controller.yaml#
> >  
> > +oneOf:
> > +  - required:
> > +      - interrupts
> > +      - interrupt-names
> > +  - required:
> > +      - poll-interval
> 
> Move this next to 'required'.
> 
> > +
> >  properties:
> >    compatible:
> >      const: bosch,m_can
> > @@ -40,6 +47,14 @@ properties:
> >        - const: int1
> >      minItems: 1
> >  
> > +  poll-interval:
> > +    $ref: /schemas/types.yaml#/definitions/flag
> 
> This is a common property already defined as a uint32. You shouldn't 
> define a new type.
> 
> A flag doesn't even make sense. If that's all you need, then just enable 
> polling if no interrupt is present.

Ok, then it's implicit. No IRQs -> polling.

Marc

-- 
Pengutronix e.K.                 | Marc Kleine-Budde          |
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