linux-kernel - Re: [PATCH v2 2/4] dt-bindings: net: can: Add poll-interval for MCAN

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Date:   Mon, 24 Apr 2023 22:17:06 +0200
From:   Marc Kleine-Budde <mkl@...gutronix.de>
To:     Judith Mendez <jm@...com>
Cc:     Chandrasekar Ramakrishnan <rcsekar@...sung.com>,
        Wolfgang Grandegger <wg@...ndegger.com>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        "David S . Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>, linux-can@...r.kernel.org,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        Schuyler Patton <spatton@...com>, Nishanth Menon <nm@...com>,
        Vignesh Raghavendra <vigneshr@...com>,
        Tero Kristo <kristo@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        linux-arm-kernel@...ts.infradead.org, devicetree@...r.kernel.org,
        Oliver Hartkopp <socketcan@...tkopp.net>
Subject: Re: [PATCH v2 2/4] dt-bindings: net: can: Add poll-interval for MCAN

On 24.04.2023 14:54:00, 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@...com>

The bindings update should go in before the patch.

> ---
> Changelog:
> 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         | 26 ++++++++++++++++---
>  1 file changed, 23 insertions(+), 3 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..1c64c7a0c3df 100644
> --- a/Documentation/devicetree/bindings/net/can/bosch,m_can.yaml
> +++ b/Documentation/devicetree/bindings/net/can/bosch,m_can.yaml
> @@ -40,6 +40,10 @@ properties:
>        - const: int1
>      minItems: 1
>  
> +  poll-interval:
> +    $ref: /schemas/types.yaml#/definitions/flag
> +    description: Poll interval time in milliseconds.
                    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

That's not what the code does.

> +
>    clocks:
>      items:
>        - description: peripheral clock
> @@ -122,15 +126,13 @@ required:
>    - compatible
>    - reg
>    - reg-names
> -  - interrupts
> -  - interrupt-names
>    - clocks
>    - clock-names
>    - bosch,mram-cfg

Is it possible to specify that you either need "interrupts" and
"interrupt-names" or "poll-interval"?

>  
>  additionalProperties: false
>  
> -examples:
> +example with interrupts:
>    - |
>      #include <dt-bindings/clock/imx6sx-clock.h>
>      can@...8000 {
> @@ -149,4 +151,22 @@ examples:
>        };
>      };
>  
> +example with timer polling:
> +  - |
> +    #include <dt-bindings/clock/imx6sx-clock.h>
> +    can@...8000 {
> +      compatible = "bosch,m_can";
> +      reg = <0x020e8000 0x4000>, <0x02298000 0x4000>;
> +      reg-names = "m_can", "message_ram";
> +      poll-interval;
> +      clocks = <&clks IMX6SX_CLK_CANFD>,
> +               <&clks IMX6SX_CLK_CANFD>;
> +      clock-names = "hclk", "cclk";
> +      bosch,mram-cfg = <0x0 0 0 32 0 0 0 1>;
> +
> +      can-transceiver {
> +        max-bitrate = <5000000>;
> +      };
> +    };
> +
>  ...
> -- 
> 2.17.1
> 
> 

Marc

-- 
Pengutronix e.K.                 | Marc Kleine-Budde          |
Embedded Linux                   | https://www.pengutronix.de |
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